JPH064127B2 - Injection mixing nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet mixing nozzle for combining basic and acidic liquids with a high pressure gas and lines for these liquids.

It is known to mix the liquids in question with one another and then to jet the mixture in order to make a jet product formed from an acid and a base. This working method requires a high degree of dilution, which controls the exotherm or avoids explosive reactions.

In a refinement of this state of the art, a jet mixing nozzle has been developed which allows mixing of basic and acidic liquids immediately after jetting. In this case, the heat of neutralization then covers at least part of the energy required for evaporation of the dispersion medium or solvent. The jet mixing nozzle has a central conduit and two concentric annular conduits. The inner conduit (s) are for liquids and the outer conduits are for high pressure gas (GB 1188582). A jet-mixing nozzle of known construction provides considerable advantages and premixes the components. Avoid the drawbacks of the case,
There is a critical deficiency, that is, a relatively small processing power. It was found that when the size of the nozzle and the air passage amount were increased to a practicable degree, the fineness of injection and the degree of neutralization were rapidly reduced at the total treatment amount exceeding 150 to 200 / h. The use of multiple nozzles is often limited for space reasons. A further disadvantage is that each nozzle requires its own unique metering device consisting of two metering pumps, a pipe joint, a valve, and in some cases a flow meter, which increases the equipment cost of many nozzles and the outlook of the apparatus. Is to deteriorate.

The object of the present invention is to provide a jet mixing nozzle which has no known drawbacks and in particular has a high product uniformity and a high throughput.

According to the invention, a jet mixing nozzle with high-pressure gas and lines for these liquids for combining basic and acidic liquids is provided according to the invention with the central high-pressure gas line 1, the basic To at least 2 for acidic liquids
This is solved by featuring individual concentric annular conduits 2, 3 and an outer concentric annular high pressure gas conduit 4.

As a result of the cooperation of the central high-pressure gas line and the outer annular high-pressure gas line, both liquids are strongly pressed against each other and thorough mixing is achieved even when the liquid load is high.
Both the degree of neutralization and the fine spray are decisively improved compared to known spray mixing nozzles.

In principle, there is another concentric annular line for a third liquid, for example a second acid or neutral liquid, and there are three concentric annular lines for the liquid surrounding the central high pressure gas line. It is possible to do so. In the case of injection of three liquids, it may be advantageous to provide a separate high-pressure gas line between the annular liquid lines to enhance the injection.

The ratio of the flow cross section for high pressure gas between the inner central high pressure gas line and the outer concentric annular high pressure gas line is preferably 1: 3 to 1: 1.
Should be 10. Scheduled injection capacity of about 1000 / h
If the central high-pressure gas pipe cross-section 0.067Cm ² of those of the outer annular conduit is particularly advantageous results are achieved when it is 0.4 cm ^2.

The outlet of the central high pressure gas line is expediently drawn a few mm forward of the nozzle outlet so that it ends approximately at the injection point of the liquid. This enhances the action of the inner gas feed. In the nozzle where the outer concentric high pressure gas line has a diameter of 18 mm, the inner central high pressure gas line projects about 6 mm from the plane of the other gas and liquid outlets.

In another advantageous embodiment of the invention, the outer wall of the outermost annular high-pressure gas line tapers conically towards the nozzle outlet, at least in the region of the opening, thus providing a central integration point for the high-pressure gas. Form a guide towards.

Any gas under pressure can be used to operate the jet mixing nozzle. Besides air, nitrogen and carbon dioxide or ammonia or steam are also suitable.

For the central high-pressure gas line it is expedient to adjust to the same gas pressure as for the outer concentric annular high-pressure gas line.
As a result of the desired different flow cross sections, the quantity of high-pressure gas in the inner high-pressure gas line is then significantly less than that in the outer high-pressure gas line.

As the gas pressure rises, to a certain extent the fineness of the injection and the completeness of neutralization also increase. Gas pressures in the range of 4 to 5 bar are generally a concern for operational reasons, although higher gas pressures can be used to advantage.

Preheating of high-pressure gas is recommended if the heat of neutralization is not enough when attempting to vaporize a liquid using the injection method.

The spray-mixing nozzle according to the invention can be used particularly preferably in a spray tower for the production of powdered products or in a spray-mixing drum for introducing the spray products into the base layer passing through the drum.

The invention is explained in more detail by way of example with the aid of the drawings and the examples.

The jet mixing nozzle has a central high pressure gas line 1, two concentric annular lines 2 and 3 for basic and acidic liquids and an outer concentric annular high pressure gas line 4 for two liquid mixing. Both liquids are fed via the inlet branch pipes 5 and 6. The high-pressure gas is introduced via the branch pipes 7 and 8. The outer wall of the outer high-pressure gas line 4 is formed in a conical shape so that the gas flows toward the central integration point. The inner high-pressure gas line 1 projects slightly from the lines 2, 3 and 4.

Example 1 In order to demonstrate the quality of the spray-mixed product and the capacity of the spray-mixing nozzle according to the invention, spraying was performed vertically downward at a distance of 120 cm. This distance is approximately equal to the average distance between the injection nozzle and the base layer in the large-sized injection device.

Below the jet stream, at a distance of 120 cm from the jet mixing nozzle, a plate was passed parallel to the ground so that the jet liquid hits a fraction of a second. A piece of hard paper was applied to the board. The liquid was marked as a strip on the paper, but individual droplets were very visible on the edges.

As a test solution, 10 parts of water colored red with Rhodamine B were used.
A solution in which 250 g of cellulose glycolato-lelatin was useful was useful. The second methylene blue colored solution contained 50 g of lelatin in 10 parts of water.

First, the illustrated spray mixing nozzle according to the invention was tested. Four
When jetting red solution 500 / h and blue solution 100 / h with barometric pressure compressed air, a perfectly satisfactory jet mix was obtained as indicated by the uniform purple mixing color of the droplets on the paper. The results were still satisfactory with a 3 bar gauge.

Red solution 1000 / h and blue solution 200 / h 4
The results were quite usable with barometric gauges, taking into account the practical requirements. The jet was fine enough that most of the droplets were purple. However, the results were clearly better with an air pressure 5 bar gauge on the inner and outer high pressure gas conduits.

A comparison with the jet mixing nozzle described in GB 1188582 gave the following results. Red solution 150
/ H and a blue solution of 30 / h and the use of air pressure of 4 atm gauge still gave satisfactory results. The observable droplets showed a fine and overwhelmingly purple mixed color. The treatment of the red solution 200 / h and the blue solution 40 / h already gave poor results. Certainly, some red or blue colored droplets were confirmed. The jetting was completely unsatisfactory with the red solution 300 / h and the blue solution 60 / h.

Example 2 In a closed space, it was also injected horizontally from one end face of the double cone injection drum to the inside (West German Patent 119).
7064). This jet mixing drum has a length of 240
cm, maximum diameter 180 cm. There was a high-performance suction device on the other end face.

Filling holes in the large area of the drum have guides for rods that are transitioning to a round all-blade with one end
Hard paper was attached to one side of the blade. When inserted in the center of the jet mixing drum, the distance from the jet mixing nozzle was about 120 cm. Prior to the experiment, the paper was impregnated with an alcohol solution of naphtholphthalein as an indicator and dried. The resulting color allowed us to recognize whether the impinging droplets were alkaline, acidic or neutral, and thus also how well the mixing took place. For injection, 50 ° C. alkyl benzene sulfonic acid served as the first liquid and sodium hydroxide solution as the second liquid. First, stick
It was inserted so that the paper side faces away from the jet mixing nozzle. The rod was then rotated 360 ° as quickly as possible so that the paper was exposed to the jet stream for a very short time during rotation.
Then the rod was immediately pulled out and the injection was terminated.

In the case of using the injection mixing nozzle shown in the drawing, alkylbenzene sulfonic acid 500 / h and sodium hydroxide solution 100 / h are used with the air pressure 4 atm gauge of the inner and outer high pressure gas lines
/ H could be finely jetted. Neutralization was perfect. Again with alkyl benzene sulphonic acid 1000 / h and sodium hydroxide solution 200 / h the results on the 4 atm gauge were again quite usable. It could be recognized that there were only very few very fine acid droplets due to the color of the paper. Increasing the air pressure in both high pressure conduits to a 5 bar gauge could improve the results. The neutralization was then virtually complete and the fineness of the drops was satisfactory. When the jet mixing nozzle described in British Patent No. 1188582 was used, good results were obtained with a throughput of alkylbenzolsulfonic acid of 150 / h and a sodium hydroxide solution of 30 / h and an air pressure of 4 atm gauge. The injection was fine and neutralization was satisfactory. The injection quality was remarkably deteriorated when the acid was 200 / h and the alkaline solution was 40 / h. Acid 300 / h and alkaline solution 60
With / h, neither neutralization nor injection was completely satisfactory. Many large acid droplets were present on the paper.

Neutralization spray mixing with a spray mixing nozzle according to the present invention is acid 1
The processing amount of 000 / h and the amount of the base necessary for its neutralization were satisfactory. Therefore, the requirements imposed on throughput in the field are met.

EXAMPLE In a cylindrical injection tower having a height of 10.5 m, 352 kg / h of 50% sodium hydroxide solution was passed through the inner annular pipe 2 and the concentrated alkyl benzene sulfonic acid ( A mixture of 350 kg (AS3-acid) and 150 kg concentrated sulfuric acid was sprayed every hour. Air was used as the high pressure gas. The pressure was adjusted to 4.5 atm gauge in both high pressure gas lines 1 and 4.

Hot air at 200 ° C was passed in countercurrent to the injection tower.

The result is 64% sodium alkyl benzene sulfonate and 36% sodium sulphate in the form of white lightweight particulate powder.
Resulting in a mixture with. This mixture is suitable as an intermediate product for the production of detergents by the jet mixing method.

Example 4 This example describes the application of an injection mixing nozzle according to the invention in combination with a mixing process in a single-stage conical rotary injection mixing drum (corresponding to German patent application WO 20065033 A3). The larger diameter of the injection chamber is 1.9m,
Its length was 2.3 m. Rotation speed of jet mixing drum is 4
It was 7 times / minute. 3.07t and 6.03t / h mixed
It was two kinds of detergent raw materials 1 and 2 (see the table).

250 kg / h of alkylaryl polyglycol ether was sprayed from a conventional two-material nozzle. In addition, 299 kg / h of alkyl benzene sulfonic acid (AS3-acid) and 67.5 kg / h of 50% sodium hydroxide solution were injected by the injection mixing nozzle shown in the figure.

300 kg / h of magnesium silicate was further continuously mixed in the finishing mixing chamber following the injection chamber. The overall composition of the product is found in the table below.

A clear, easily granulated product with a bulk specific gravity of 340 g / was obtained.

As described above, according to the present invention, it is possible to obtain an effect that a product with high processing capacity and high uniformity can be produced with a simple and inexpensive device.

[Brief description of drawings]

The figure shows a longitudinal section of a jet mixing nozzle according to the invention. 1 ... Central high-pressure gas pipeline, 2, 3 ... Liquid concentric annular pipeline, 4 ... Outer concentric annular high-pressure gas pipeline, 5, 6 ... Liquid inlet branch pipe, 7, 8 ... High-pressure gas inlet Branch pipe.

Claims (4)

[Claims] 1. For combining basic and acidic liquids,
In a jet mixing nozzle with lines for high-pressure gas and these liquids, a high-pressure gas line (1) central to the nozzle outlet, at least two concentric annuli for basic or acidic liquids A jet mixing nozzle characterized by tubes (2, 3) and an outer concentric annular high pressure gas line (4). 2. A ratio of the cross-section of the central high-pressure gas line (1) to the outer concentric annular high-pressure gas line (4) is 1: 3 to 10. The injection mixing nozzle according to claim 1. 3. An outlet for a central high-pressure gas line (1) projecting forward as compared to the concentric annular lines (2, 3 and 4), characterized in that: The jet mixing nozzle described. 4. The injection mixing nozzle according to claim 1, 2 or 3, characterized in that the outer concentric annular high-pressure gas conduit (4) has a conical taper shape at least in the opening range of the outer wall. .