JP4861145B2 - Separation and dissolution structure of trihalomethane analyzer - Google Patents

Description

  The present invention relates to the structure of a trihalomethane gas separation and dissolution part used in a trihalomethane analyzer for low melting point organic chlorine compounds in a solution.

  Trihalomethane is produced due to organic compounds in water and chlorine used to ensure epidemiological safety. Trihalomethane in water is volatile and has the property of being able to permeate a microporous membrane as a gas. This permeated trihalomethane can be separated from suspensions in water, ions and various interferences by dissolving in the carrier liquid.

As the trihalomethane analyzer for automatically analyzing the trihalomethane, there are provided techniques such as Patent Document 1 (Japanese Patent Laid-Open No. Hei 4-223266) and Patent Document 2 (Japanese Patent Laid-Open No. Hei 2-145961) related to the applicant's application. ing.
FIG. 4 is a system diagram showing the basic configuration of such a trihalomethane analyzer.
In this trihalomethane analyzer, a carrier liquid feeding part such as a liquid feeding pump 3, a sample liquid feeding part such as a liquid feeding pump 7, a trihalomethane gas separation / dissolution part such as a separation / dissolution part 38, and a reaction part 9 , And a detection unit 10.

The liquid feed pump 3 separates a carrier liquid 12 in which a nicotinamide solution introduced through the nicotinamide solenoid valve 1 and a sodium hydroxide solution introduced through the sodium hydroxide solenoid valve 2 are mixed. It is configured to be supplied to the melting unit 38.
The liquid feed pump 7 mixes an acidic reducing agent solution (hydrazine sulfate solution) introduced through the acidic reducing agent solution electromagnetic valve 6 with the sample water 4 containing trihalomethane introduced through the sample water electromagnetic valve 5. The separation / dissolution unit 38 is supplied. In association with the separation / dissolution unit 38, an air pump 11 that supplies air into the gas chamber 23 in the separation / dissolution unit 38 is provided.
In the separation / dissolution unit 38, trihalomethane gas is separated from the sample water 4 heated to about 70 ° C. by the heaters 13 and 14 through the internal gas separation membrane 8. The separated and gasified trihalomethane gas comes into contact with the gas dissolution film 25 through which the carrier liquid 12 flows, so that it is dissolved in the carrier liquid 12 and conveyed to the reaction unit 9.

The reaction unit 9 is maintained at about 90 ° C. by the heater 16, and is heated to about 90 ° C. by the heater 16 in the course of flowing the carrier liquid 12, and the trihalomethane in the carrier liquid 12 is reacted with nicotinamide. ing.
The detection unit 10 measures the fluorescence intensity of the reaction product in the reaction unit 9 and transmits the photomal sensor signal to an analysis unit (not shown).
The waste water subjected to the above analysis process passes through the pipe 51, joins the drainage of the sample water 4 discharged from the separation / dissolution part 38 through the drain pipe 52, and is discharged to the outside. become.

FIG. 5 is a longitudinal sectional view showing the structure of the separation / dissolution part 38, and FIG. 6 is an enlarged sectional view of part A in FIG.
In FIGS. 5 and 6, 19B is a heat insulating portion constituting the outer portion, and the inside of the separating / dissolving portion 38 is covered with the heat insulating portion 19B. Reference numeral 22A denotes a carrier liquid inlet provided on one end side of the separation / dissolution part 38. The carrier liquid 12 passing through the carrier liquid pipe 22z from the carrier liquid inlet 22A is preheated by the preheating block 18 and then the gas chamber 23. Introduced in.
Reference numeral 20A denotes a sample water inlet provided at a lower portion near the other end side of the separation / dissolution part 38, and the sample water 4 is introduced into the gas chamber 23 from the sample water inlet 20A, and the heating part 19A (FIG. 4). Heated to about 70 ° C. by the heater 13 or 14). The sample water 4 is separated from the trihalomethane gas (the boiling point of the trihalomethane gas is 62.5 ° C.) by passing through the gas separation membrane 24 inside, and the separated and gasified trihalomethane gas is dissolved in the gas through which the carrier liquid 12 flows. The film 25 is dissolved in the carrier liquid 12 by being in contact with the film 25 to become a trihalomethane gas-dissolved carrier liquid, and passes through the joint part 50 and the carrier liquid 22B provided on the other end side of the separation / dissolution part 38 and the reaction part 9 (FIG. Reference).
The drainage of the sample water 4 is discharged from the sample water outlet 20B provided in the intermediate part of the separation / dissolution part 38 to the pipe 52, and merges with the drained water subjected to the analysis process as shown in FIG. It is discharged to the outside through 53. An air inlet 21A for supplying air into the carrier liquid 12 and an air outlet 21B for discharging used air are provided below the separation / dissolution unit 38.

On the other hand, in the joint 50, as shown in detail in FIG. 6, the joint 26 is screwed into the inner cylinder 19C of the separation / dissolution part 38, and the carrier liquid outlet pipe 28 is fixed to the outlet side by brazing or the like. Yes. A gas-dissolving film-fixing metal tube 27 is inserted inside the joint 26, and the end of the gas-dissolving film 25 is between the outer periphery of the gas-dissolving film-fixing metal tube 27 and the inner periphery of the hole of the joint 26. It is fixed.
JP-A-4-223266 Japanese Laid-Open Patent Publication No. 2-145961

However, the conventional trihalomethane analyzer described above, particularly the separation / dissolution part of the trihalomethane gas, has the following problems to be solved.
(1) The first problem is to improve the efficiency of the so-called Fujiwara reaction.
That is, in order to improve the efficiency of the so-called Fujiwara reaction in which the reaction between the trihalomethane and nicotinamide in the reaction unit 9 generates a fluorescent substance, so-called Fujiwara reaction, It is necessary to increase the contact time (reaction time) with the trihalomethane gas (gasified from the water 4) or to increase the contact area. As its concrete means,
(A) Decreasing the flow rate of the carrier liquid 12 to reduce the flow rate;
(B) increasing the mutual surface area of the gas separation membrane 24 and the gas dissolution membrane 25;
The following two means are conceivable.

However, the means (A) has a drawback that it takes a long processing time.
The means (B) can easily increase the surface area of the gas separation membrane 24. However, the gas dissolving membrane 25 needs to be lengthened in order to increase the surface area. However, the tube material of the gas-dissolving membrane 25 is soft because it is PTFE (tetrafluoroethylene), so tension is necessary. For this reason, it is difficult to lengthen the dimension, and the tube-type gas dissolving film 25 as in the above prior art has a limit in efficiency.
Due to such problems, the amount of trihalomethane gas dissolved is limited, and in order to obtain a predetermined sensitivity as a measuring device, it is necessary to increase the concentration of the carrier liquid 12. The concentration of nicotinic acid amide solution is as high as about 25%.
However, since nicotinamide is very expensive, the operating cost of the trihalomethane analyzer becomes high, and as a result, improving the efficiency of the Fujiwara reaction has become an important issue.

(2) The second problem lies in the connection structure of the gas dissolution film 25 with the carrier liquid outlet pipe 28.
That is, the gas-dissolving film 25 is required to have a pipe joint for connection with the front and rear processes. However, in the structure of the joint part 50 as shown in FIG. Is in a state.
As shown in FIG. 6, a gas-dissolving film fixing metal pipe 27 is inserted into the joint 50 of the gas-dissolving film 25 and the carrier liquid outlet pipe 28, and the joint 26 is tightened with a screw. The carrier liquid outlet pipe 28 and the gas dissolution film 25 are both fixed. For this reason, by inserting the gas-dissolving film-fixing metal pipe 27, a step is generated between the metal pipe 27 and the gas-dissolving film 25, and the carrier liquid 12 is likely to stagnate.

On the other hand, since air for purging the trihalomethane gas flows at a predetermined flow rate (about 200 ml / min) before and after measuring the fluorescence intensity of the trihalomethane reaction product, the carrier liquid 12 comes into contact with the air via the gas dissolution film 25.
The nicotinamide solution that is the main component of the carrier liquid 12 needs to have a high carrier liquid concentration in order to avoid a deterioration in reaction efficiency due to the problem described in the above (1). The concentration is maintained.
For this reason, in addition to being highly viscous (as a characteristic of nicotinamide solution), when it comes into contact with air, the solution evaporates and nicotinamide is precipitated in powder form.
Therefore, when this apparatus is operated for a long period of time, nicotinamide is deposited in contact with air at the place where the carrier liquid 12 is stagnant. When such precipitation of nicotinamide occurs, the gas-dissolving film metal pipe 27 is closed due to its small diameter, and nicotinamide is also precipitated inside the gas-dissolving film 25.
The material of the gas-dissolved film 25 is Teflon (PTFE). However, if it becomes dirty due to the precipitation of nicotinic acid amide as described above, the water repellency is lowered, and the carrier liquid 12 leaks from the gas-dissolved film 25. Thereby, the reproducibility is lowered and the film life is reduced.

(3) The third problem is that skill is required to replace the gas dissolution membrane 25.
That is, as described in the above item (1), the gas-dissolved film 25 is easily soiled because the carrier liquid 12 has a high concentration. If the gas-dissolved film 25 is contaminated, the water repellency is lowered and the reproducibility of the analysis is affected. Therefore, the gas-dissolved film 25 is periodically replaced.
When the gas-dissolving film 25 is replaced, the joint 26 of the joint portion 50 in FIG. 6 is removed, a new gas-dissolving film 25 is attached, and the gas-dissolving film-fixing metal pipe 27 is inserted into the joint portion 50 again. The pipe 28 and the gas dissolving film 25 are fixed together by tightening the screw of the joint 26.
This work requires a delicate adjustment of the degree of tightening of the joint 26, and if the tightening force is excessive, it will lead to liquid leakage, so skill is required to insert the metal piping 27 for fixing the gas-dissolving film, In addition, work efficiency is also reduced.

(4) The fourth problem is adhesion of water droplets to the gas separation / dissolution membrane 25.
As described above, the temperature of the heating unit 19A is maintained at about 70 ° C., and the trihalomethane gas contained in the sample water 4 has a boiling point of 62.5 ° C. Therefore, the gas chamber 23 is interposed via the gas separation membrane 24. However, since the gas separation membrane 24 has good water vapor permeability as well as gas permeability, a large amount of water vapor is generated.
For this reason, the excessively supplied water vapor is supersaturated in the gas chamber 23 and is condensed on the surfaces of the gas separation membrane 24, the gas dissolution membrane 25 and the like, thereby inhibiting gas separation and solubility. As shown in FIG. 5, since the gas separation membrane 25 is installed in a horizontal plane, water vapor is likely to adhere, and if such water vapor is adhered, measurement reproducibility is lowered.

  The present invention has been made in view of such a situation, and an object of the present invention is to improve the efficiency of the so-called Fujiwara reaction in the reaction section and to prevent the leakage of the connection structure of the carrier liquid extraction section of the gas dissolution membrane. An object of the present invention is to provide a structure for separating and dissolving a trihalomethane analyzer that is simplified and prevents the occurrence of condensation on the surfaces of the gas separation membrane and the gas dissolution membrane.

In order to solve the above-mentioned problems of the prior art, the present invention comprises a separation / dissolution part that separates trihalomethane gas from sample water and dissolves it in a carrier liquid, and heats a trihalomethane gas-dissolved carrier liquid from the separation / dissolution part. In the trihalomethane analyzer equipped with a reaction section for reacting trihalomethane with nicotinamide, a plate for sample water having a grooved sample water flow path for flowing the sample water, and for flowing the carrier liquid A carrier liquid flat plate having a groove-like carrier liquid flow path, a gas chamber flat plate having a trihalomethane gas flow path including a through groove for holding the trihalomethane gas, and holding the sample water. A gas separation flat membrane for separating the trihalomethane gas from the sample water and a carrier holding the carrier liquid. A gas-dissolving flat membrane for dissolving halomethane gas in the carrier liquid, a gas separating flat membrane and a gas-dissolving flat membrane for pressurizing the flat surfaces of the respective flat plates, and the flat plates Heating means for heating, the gas separation flat membrane and the gas dissolving flat membrane are arranged on both sides of the flat plate for the gas chamber, and on the outside of the gas separation flat membrane The flat plate for the sample water is arranged, and the flat plate for the carrier liquid is arranged outside the flat film for gas dissolution, while the flat plate for the gas chamber, the flat plate for the sample water, and the carrier liquid Of the gas separation flat membrane and the sample water flat plate, the gas dissolution flat membrane and the carrier liquid flat plate , respectively. From outside Unishi Te placing a pair of the pressing plate, and configured to close contact with the respective flat plate and the gas separation flat membrane and a flat membrane for the gas dissolved by connecting means for connecting said retainer plates are.
In the present invention, preferably, the flat groove for the gas chamber and the flat groove for the sample water are disposed so as to face each other with the gas separation flat membrane interposed therebetween.

  Further, in the present invention, a trihalomethane gas comprising a groove-shaped sample water flow path in the sample water flat plate, a groove-shaped carrier liquid flow path in the carrier liquid flat plate, and a through groove in the gas chamber flat plate. A convex protrusion is provided on an end surface of the flow path on the side in contact with the gas separation flat membrane or the gas dissolving flat membrane, and the gas separation flat membrane or the gas dissolving flat membrane is formed on the protrusion. By bringing the surfaces into pressure contact, fluid sealing of each of the flow paths is performed.

  Further, in the present invention, a part or all of the flat plate for the sample water, the flat plate for the carrier liquid, and the flat plate for the gas chamber are made of a heat-weldable material containing Teflon, Convex protrusions are provided on the end surfaces of the sample water channel, the carrier liquid channel, and the trihalomethane gas channel formed on the flat plate on the side in contact with the gas separation flat membrane or the gas dissolution flat membrane, The gas separation flat membrane or the surface of the gas dissolving flat membrane is brought into contact with the protrusions so as to be heat-welded.

  As described above, according to the separation and dissolution part structure of the trihalomethane analyzer according to the present invention, the sample water flow path, the carrier liquid flow path, and the trihalomethane gas flow path are formed in a flat plate, so that the bent portion is formed like a conventional tube. In addition, the surface area of the membrane for separating and dissolving the trihalomethane gas can be freely increased as necessary. As a result, the contact time between the separated trihalomethane gas and the carrier liquid for dissolving the gas can be extended, the reaction is saturated to the limit in a short time, and the reaction efficiency (the so-called Fujiwara reaction efficiency) is improved. be able to.

In addition, in the trihalomethane analyzer to which the present invention is applied, one measurement time (reaction time) is a basic performance of about 1 hour. Because there was a limit, detection of 5 μg / L of chloroform, which is the lower limit of detection, is compatible with detection and reaction time at an S / N ratio of 3 or more, so the concentration of the nicotinamide solution in the carrier liquid is 25% or more. There was a need.
However, according to the present invention, the sample water flow path, the carrier liquid flow path, and the trihalomethane gas flow path are formed on the flat plate, so that the concentration of the nicotinamide solution in the carrier liquid is 6.25% of 1/4 of the above concentration. Even when diluted to 5 μg / L, which is the lower limit of detection, it was possible to detect with an S / N ratio of 5 or more.
Thereby, the usage-amount of expensive nicotinic acid amide can be decreased, and the operating cost of an apparatus can be reduced (about 1/4 of the past).

Further, according to the present invention, a gas separation flat membrane and a gas dissolution flat membrane are arranged on both sides of a gas chamber flat plate, and the sample water flat plate is arranged outside the gas separation flat membrane. In addition, a flat plate for the carrier liquid is disposed outside the flat film for gas dissolution, while the flat plate for the gas chamber, the flat plate for the sample water, and the flat plate for the carrier liquid are disposed on the apparatus installation surface. The gas separation flat membrane and the sample water flat plate and the gas dissolving flat membrane and the carrier liquid flat plate are sandwiched from the outside. Are arranged so that the flat plate for gas separation and the flat plate for gas dissolution and each flat plate are brought into close contact with each other by the connecting means for connecting the press plates to each other. Is a conventional technique The joint as Ri Do not required, to be discharged easily to the outside from a plurality of locations condensed water in a large amount generated during trihalomethane gas separation flowed in the height direction of the THM gas passage of the gas chamber plate possible and that Do not.
Thereby, the problem of leakage of the carrier liquid from the joint part, such as the means provided with the conventional joint part, can be solved, and the reproducibility of the trihalomethane gas concentration measurement can be improved. In addition, unlike conventional equipment, there was no dew condensation drainage means, so it was possible to avoid the problem of dew condensation water adhering to the surface of the membrane, resulting in poor repeatability, and easy drainage of dew condensation water even during measurement. The repeatability can be greatly stabilized.

Also, according to the present invention, the gas separating flat membrane and the gas dissolving flat membrane are each brought into close contact with the flat plates by the connecting means for connecting the presser plates, so that the screws constituting the connecting means are removed. Thus, the gas separation flat membrane or the gas dissolving flat membrane can be easily exchanged.
As a result, when replacing the gas separation membrane or gas dissolution membrane as in the prior art, the joint portion is removed, a new gas separation membrane or gas dissolution membrane is attached, and the inside of the joint portion is again attached. Inserting a metal pipe for fixing the gas dissolution membrane and tightening the joint screw eliminates the need for complicated work that requires the skill of fixing both the pipe and the gas separation membrane or the gas dissolution membrane. The efficiency of exchanging the membrane or the gas-dissolving flat membrane can be improved, and the occurrence of liquid leakage from the joint as in the prior art can be avoided.

  Below, the embodiment is described in detail about the separation dissolution part structure of the trihalomethane analyzer concerning the present invention.

[First Embodiment]
FIG. 1 is an exploded perspective view showing the connection structure of the separation / dissolution part of the trihalomethane analyzer according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the separation / dissolution part in the first embodiment.
In FIG. 1, reference numeral 38 denotes a separation / dissolution part that separates trihalomethane gas from sample water and dissolves it in a carrier liquid, and is configured as follows.
That is, the separation / dissolution part 38 is sandwiched between the carrier liquid flow path pressing plate 35 and the sample water flow path pressing plate 32 so as to be perpendicular to the installation surface, The gas dissolution flat membrane 33, the gas chamber plate 29, the gas separation flat membrane 30, and the sample water flow channel plate 31 are screwed and fixed in this order through through holes formed in each.
The sample water heating unit 33A and the carrier liquid heating unit 33B disposed on both sides of the member are heaters for heating the sample water 4 and the carrier liquid 12, respectively.

Next, the details of the separation / dissolution part 38 will be described with reference to FIG.
In FIG. 2, sample water 4 (see FIG. 4) is injected from a sample water inlet 20A, flows into a flow path constituted by a sample water flow path plate 31 and a gas separation flat membrane 30, and is discharged from a sample water outlet 20B. It has come to be.
At this time, the sample water 4 flows through the grooved sample water passage 31s formed on the surface of the sample water flow path plate 31 on the gas separation flat membrane 30 side while contacting the gas separation flat membrane 30 with a predetermined flow rate ( For example, the flow rate is 1 ml / min or more). Therefore, the sample water passage 31s is formed in a zigzag shape (meandering shape) inclined like a staircase in the vertical direction so that the length of the flow path is increased, and the sample water inlet 20A is provided with the sample water inlet 20A. The sample water outlet 20B is disposed at the upper portion of the sample water passage 31s, and is disposed at the lower portion of the passage 31s.
When trihalomethane is contained in the sample water 4 as described above, the sample water heating section 33A is heated to, for example, a boiling point of 62.5 ° C. or higher of the trihalomethane, and the trihalomethane gas is gasified. Through the water vapor, it reaches a trihalomethane gas flow path 29s of a gas chamber plate 29 described later together with water vapor.

In the gas chamber plate 29, a groove-like trihalomethane gas flow path 29s penetrates the gas chamber plate 29 and is formed in a zigzag shape (meandering shape) inclined like a step in the vertical direction. The trihalomethane gas channel 29s of the gas chamber plate 29 and the sample water channel 31s of the sample water channel plate 31 are arranged so as to face each other with the gas separation flat membrane 30 interposed therebetween. Therefore, the trihalomethane gas accumulated in the trihalomethane gas flow path 29 s flows while being in contact with the gas dissolving flat membrane 33 and in contact with the gas separation flat membrane 30.
On the other hand, the carrier liquid 12 (see FIG. 4) enters from the carrier liquid inlet 22A, and for the same reason as the sample water passage 31s, the carrier liquid flow path plate 34 has a staircase extending in the vertical direction on the surface on the gas dissolution flat film 33 side. The grooved carrier liquid flow path 34s formed in an inclined zigzag shape (meandering shape) flows in contact with the gas dissolution flat film 33 and is discharged from the carrier liquid outlet 22B. When the carrier liquid 12 flows, the trihalomethane gas is dissolved into the carrier liquid 12 through the gas dissolution flat film 33.
The gas separation flat membrane 30 and the gas dissolution flat membrane 33 both have fine holes having a hole diameter of 0.1 μm or less, for example.
In the first embodiment, since the carrier liquid flow path plate 34 and the gas dissolution flat film 33, and the gas chamber plate 29, the sample water flow path plate 31 and the gas separation flat film 30 are flat, the gas dissolution flat film 33 and Even if a soft material such as PTFE (ethylene tetrafluoride) is used as the material of the gas separation flat membrane 30, the dimensions can be easily increased. Thereby, the length of the flow path of the carrier liquid 12 can be increased, the contact area of the trihalomethane gas can be expanded, and the sensitivity as a sensor is improved.

Next, the water vapor discharge when the sample water 4 is heated will be described.
As described above, the sample water 4 is gasified by being heated to, for example, the boiling point of 62.5 ° C. or higher of trihalomethane by the sample water heating unit 33A, and passes through the gas separation flat membrane 30 together with the water vapor to the trihalomethane gas flow path 29s of the gas chamber plate 29 To reach.
The saturation time of the trihalomethane gas in the gas chamber plate 29 and the time required for dissolution of the trihalomethane gas take at least 30 minutes. In the meantime, a large amount of water vapor evaporates with the trihalomethane gas, and adheres to the surfaces of the gas dissolution flat film 33 and the gas separation flat film 30 disposed on both sides of the trihalomethane gas flow path 29 s of the gas chamber plate 29 to form dew.

  As a means for discharging the dew condensation water, the gas chamber plate 29 is vertically arranged as shown in FIGS. 1 and 2, and the gas chamber plate 29 is provided with a trihalomethane gas flow path 29s formed of a through groove. It is formed in a zigzag shape (meandering shape) inclined like a staircase over the direction. Thereby, as shown in FIG. 2, the dew condensation water is exposed to the outside through the three air outlets 21B provided at three intervals in the height direction of the trihalomethane gas flow path 29s of the gas chamber plate 29. It is possible to discharge.

[Second Embodiment]
FIG. 3 is an exploded side view (a CC arrow view of FIG. 2) showing a partial cross section of the carrier liquid flow path plate 34 and the gas dissolution flat film 33 according to the second embodiment of the present invention.
In the second embodiment, in order to ensure the sealing property between the gas dissolving flat film 33 and the carrier liquid flow path plate 34, as shown in FIG. A convex protrusion 34t is provided on the end surface of the carrier liquid flow path 34s made of
The gas-dissolving flat film 33 is brought into contact with the protrusion 34t, and is sandwiched between the gas-dissolving flat film 33 and the protrusion 34t by the gas chamber plate 29 and the carrier liquid flow path pressing plate 35 as shown by arrows in FIG. Further, by connecting the gas chamber plate 29 and the carrier liquid flow path holding plate 35 by applying a screw (not shown) and applying pressure, the pressure is concentrated only on the protrusion 34t on the end face of the carrier liquid flow path 34s. It is configured.

This makes it possible to fix the gas-dissolving flat film 33 between the gas chamber plate 29 and the carrier liquid flow path pressing plate 35 with a strong sealing property.
As the material of the carrier liquid flow path plate 34, corrosion-resistant stainless steel, corrosion-resistant engineering plastic, and Teflon (PFA, PTFE, modified PTFE) are suitable. In particular, since Teflon has low hardness and Young's modulus, it is likely to be locally deformed and high sealing performance is easily obtained with PTFE, which is the material of the gas-dissolved flat film 33.
Although not shown, the carrier liquid flow path plate 34 and the gas dissolution flat film as shown in FIG. 3 are also used for the seal portion between the sample water flow path plate 31 and the gas separation flat film 30 in FIG. It is possible to take a seal structure similar to the seal portion between the two.

[Third Embodiment]
The third embodiment is a modification of the second embodiment, and uses Teflon (PFA, PTFE, modified PTFE) as the material of the carrier liquid flow path plate 34 (any material that can be thermally welded). With respect to the carrier liquid flow path plate 34 made of the Teflon material, as shown in FIG. 3, a convex protrusion 34t is formed on the end surface of the carrier liquid flow path 34s formed of a concave groove formed in the carrier liquid flow path plate 34. Is provided.
Then, the protrusion 34t of the carrier liquid flow path plate 34 and the gas dissolution flat film 33 are brought into contact with each other and heated and welded at a temperature of 300 ° C. or higher, and then sandwiched between the gas chamber plate 29 and the carrier liquid flow path pressing plate 35. It is fixed by.
Although not shown in the figure, the seal portion between the sample water flow path plate 31 and the gas separation flat film 30 in FIG. 2 is also heat-welded between the carrier liquid flow path plate 34 and the gas dissolution flat film 33 in this embodiment. It is possible to adopt a sealing structure by means similar to the means.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

It is a disassembled perspective view which shows the connection structure of the isolation | separation / melt | dissolution part of the trihalomethane analyzer which concerns on 1st Embodiment of this invention. FIG. 2 is an exploded perspective view showing a separation / dissolution part in the first embodiment. It is a decomposition | disassembly side view (CC arrow line view of FIG. 2) which shows the partial cross section of the carrier liquid flow-path board and gas dissolution flat film which concern on 2nd and 3rd embodiment of this invention. It is a systematic diagram which shows the basic composition of a trihalomethane analyzer. It is a longitudinal cross-sectional view which shows the structure of the isolation | separation / melt | dissolution part which concerns on a prior art. It is the A section expanded sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Liquid feed pump 4 Sample water 9 Reaction part 10 Detection part 12 Carrier liquid 23 Gas chamber 25 Gas melt film 29 Gas chamber plate 29s Trihalomethane gas flow path 30 Gas separation flat film 31 Sample water flow path plate 31s Sample water flow path 32 Sample water flow path Presser plate 33 Gas dissolution flat membrane 33A Sample water heating part 33B Carrier liquid heating part 34 Carrier liquid flow path plate 34s Carrier liquid flow path 34t Protrusion 35 Carrier liquid flow path pressing plate 38 Separation / dissolution part

Claims (4)

A separation / dissolution part for separating the trihalomethane gas from the sample water and dissolving it in the carrier liquid, and a reaction part for heating the trihalomethane gas-dissolved carrier liquid from the separation / dissolution part to react the trihalomethane with nicotinamide. In the trihalomethane analyzer,
A flat plate for sample water provided with a grooved sample water flow path for flowing the sample water, a flat plate for carrier liquid provided with a grooved carrier liquid flow path for flowing the carrier liquid, and the trihalomethane gas A flat plate for a gas chamber having a trihalomethane gas flow path composed of a through groove for holding the gas, a flat film for gas separation for holding the sample water and separating the trihalomethane gas from the sample water, and the carrier A gas-dissolving flat film for holding the liquid and dissolving the trihalomethane gas in the carrier liquid, and a presser plate for pressurizing the flat film for gas separation and the flat film for gas dissolution to the surface of each flat plate the comprises a heating means for heating each flat on both sides of the plate for the gas chamber, arranged said gas dissolving flat membrane and the gas separation flat membrane, the gas A flat plate for the sample water is arranged outside the flat membrane for separation, and a flat plate for the carrier liquid is arranged outside the flat membrane for gas dissolution, while the flat plate for the gas chamber and the sample water are arranged. The flat plate for gas and the flat plate for the carrier liquid are arranged so as to be perpendicular to the apparatus installation surface, and each of the flat membrane for gas separation and the flat plate for sample water, the flat membrane for gas dissolution, and A pair of pressing plates are arranged so as to sandwich each of the carrier liquid flat plates from the outside, and the gas separating flat membrane and the gas dissolving flat membrane are connected to the pressing plates by connecting means for connecting the pressing plates to each other. A structure for separating and dissolving a trihalomethane gas analyzer, characterized in that the flat plate is closely attached.   The flat groove for the gas chamber and the flat groove for the sample water are disposed so as to face each other with the gas separation flat membrane interposed therebetween. Separation and dissolution part structure of trihalomethane analyzer. The gas separation of a trihalomethane gas flow path comprising a grooved sample water flow path in the sample water flat plate, a grooved carrier liquid flow path in the carrier liquid flat plate, and a through groove in the gas chamber flat plate. Convex-shaped projections are provided on the end face that comes into contact with the flat membrane for gas or the gas-dissolving flat membrane, and by pressing the surface of the gas-separating flat membrane or the gas-dissolving flat membrane against the projection, The separation / dissolution part structure of the trihalomethane analyzer according to claim 1, wherein the fluid sealing of each flow path is performed . Part or all of the flat plate for the sample water, the flat plate for the carrier liquid, and the flat plate for the gas chamber are made of a heat-weldable material including Teflon (registered trademark) and are formed on the respective flat plates. Convex protrusions are provided on the end surfaces of the sample water flow path, the carrier liquid flow path, and the trihalomethane gas flow path that are in contact with the gas separation flat film or the gas dissolution flat film. by contacting the surface of the flat film or flat film for the gas dissolved gas separation, separation melting zone structure trihalomethane analyzer according to claim 1, characterized in that has been configured to heat welding.

Images