JP6438438B2 - Solvent distillation recovery method - Google Patents

Description

  The present invention relates to a solvent distillation recovery method for waste solvents such as painting, coating, and printing in the solvent field.

  Solvents are widely used in factories such as painting, paint, printing, rubber vulcanization, plastic processing and semiconductors. Solvents used in these fields are recovered due to global resource shortages and raw material cost reductions. Therefore, it has become essential to reuse them.

  The applicant has been manufacturing and selling solvent distillation recovery equipment that recovers solvent from waste solvent for many years, but it is possible to provide solvent distillation recovery equipment as cheaply as possible due to competition in the industry and customer demand. It has been demanded.

JP-A-6-114201 Japanese Patent No. 3479432

  As a result of the survey, there was a large difference in the amount of waste solvent treated by consumers, from large to small, and it was appropriate for the amount of waste solvent treated by consumers to meet the competition in the industry and the demands of customers. As a result, it has become a problem to reduce the running cost by reducing the total cost of the device.

The present invention has been made in view of the above points. In order to solve the above problems, the waste solvent is loaded into an evaporator, the solvent is evaporated under reduced pressure, and the evaporated solvent is condensed by a condenser. In order to recover the solvent, two evaporators having the same capacity of 50 to 100 liters having the same capacity are arranged to condense these evaporated solvents in common with one condenser, Evaporating solvent flow from the two evaporators to the condenser in the same state The diameter, length, and pipe connection state of the evaporating solvent discharge pipe are in the same state, and according to the amount of waste solvent processed It is another object of the present invention to provide a solvent distillation recovery method characterized by recovering a solvent using 1 or 2 groups.

In addition, the evaporators are arranged in parallel with the same capacity, and these evaporation solvent discharge pipes are connected to the evaporators in the same symmetrical shape, and one vacuum pump is used for reducing the pressure in the evaporator. It is in providing the solvent distillation collection method characterized by sharing .

  Furthermore, a pressure sensor is provided in each of the evaporation solvent discharge pipes of the evaporator, and the evaporator is heated and controlled based on the pressure sensor so that the discharge amount of the evaporation solvent from the evaporator becomes the same. It is in providing a solvent distillation recovery method.

In the solvent distillation recovery method of the present invention, as in claim 1 of the claims, the waste solvent is charged into an evaporator, the solvent is evaporated under reduced pressure, and the evaporated solvent is condensed by a condenser. In order to recover the solvent, two evaporators having the same capacity of 50 to 100 liters having the same capacity are arranged to condense these evaporated solvents in common with one condenser, Evaporating solvent flow from the two evaporators to the condenser in the same state The diameter, length, and pipe connection state of the evaporating solvent discharge pipe are in the same state, and according to the amount of waste solvent processed By using one or two units to recover the solvent, it is necessary to recover the evaporator according to the amount of waste solvent treated by the customer, rather than installing one unit with a large capacity of 200 liters or more. A small capacity of 50-100 liters Able to solvent recovery condenses sharing the capacitor 1 group evaporated solvent using one or two, inexpensive total, the apparatus can be reduced and the running cost.
In addition, the diameter, length, and pipe connection state of the evaporation solvent discharge pipe from two evaporators to one capacitor are piped in the same state, and the evaporator is sucked in under reduced pressure by a vacuum pump. even, can the state of evaporation the solvent flows in the same shape, it is possible to smoothly solvent recovery flow out the condenser evaporated solvent at the same like from the respective evaporator.

Further, in the present application, as in claim 2, the evaporators are arranged side by side with the same capacity, and these evaporation solvent discharge pipes are connected to the evaporators in the same symmetrical shape , By sharing a single vacuum pump for reducing the pressure, even if the solvent is evaporated under reduced pressure as described above, the evaporated solvent can be discharged from each of the evaporators in the same state. The solvent can be recovered.

Further, in the present application, as described in claim 3, a pressure sensor is provided in each of the evaporation solvent discharge pipes of the evaporator, and the discharge amount of the evaporation solvent from the evaporator is the same based on the pressure sensor. By controlling the heating of the evaporator, the discharge amount of the evaporated solvent from the evaporator can be controlled based on the pressure sensor so as to be the same, and even if the evaporator is evaporated under reduced pressure, and it is discharged evaporated solvent at the same like from each of the evaporator, can be smoothly solvent recovery.

System diagram for explaining the outline of one embodiment of the present invention, The system diagram for outline | summary description of another Example same as the above.

In the solvent distillation recovery method of the present invention, waste solvent is charged into an evaporator, the solvent is evaporated under reduced pressure, and the solvent is recovered by condensing the evaporated solvent with a condenser. Two of these are of the same capacity with the same capacity so that these evaporating solvents are condensed by sharing one condenser, and the vapor solvent flows from the two evaporators to the condenser. The same diameter, length, and pipe connection state of the evaporated solvent discharge pipe, and use one or two evaporators depending on the amount of waste solvent to recover the solvent. It is a feature.

  As shown in FIG. 1, the solvent distillation recovery apparatus 1 has two evaporators 2 arranged side by side, allows a filter 4 to pass through a waste solvent supply tank 3, and supplies a predetermined capacity via a relay tank 6 with a supply pump 5. Depending on the amount of waste solvent treated, one or two evaporators are used to evaporate the solvent, the evaporated solvent is condensed by the condenser 7 and liquefied, and the relay recovery tank 8 is supplied. It collects in the recovery tank 9.

  It is desirable to arrange the distillers 2 having a small capacity of, for example, 50 to 100 liters in parallel. The inner wall of the predetermined capacity has a double cylindrical structure, and steam heating is performed to a predetermined temperature with a temperature sensor or the like Thus, the solvent to be charged is evaporated in a reduced pressure state of a predetermined vacuum state. 10 is a vacuum pump for decompression, and 11 is a recovery pump.

  The same distiller 2 with a small capacity of 50 to 100 liters corresponds to the amount of waste solvent treated by the customer rather than installing one large capacity of 200 liters or more and recovering the solvent. This is because it can be considered that the use of one or two evaporators 2 to recover the solvent appropriately makes the apparatus inexpensive and can reduce the running cost. Even if two evaporators 2 are provided, it is not necessary to double the capacity of the condenser 7, the vacuum pump 10, etc., and a single one can be used.

  The relay tank 6 is provided with a level sensor 12 or the like so that the upper and lower limits of the solvent to be loaded can be detected, and the supply pump 5 can detect a predetermined amount via the level sensor 13 so that the upper and lower limits can be detected by the distiller 2. I am trying to supply.

  The condenser 7 is a shell-and-tube type or the like that allows cooling water to flow, condenses and evaporates the evaporated solvent from the distiller 2, and causes the liquefied solvent to flow out to the relay collection tank 8 and the collection tank 9. ing.

The evaporating solvent discharge pipe 14 from the evaporator 2 to the condenser 7 is connected to the two evaporators 2 with the same diameter, length, pipe connection state and the like so that the evaporating solvent flows in the same state. Even if the evaporating solvent is sucked from the evaporator 2 under the reduced pressure by the vacuum pump 10, the evaporating solvent can flow out from each evaporator 2 to the condenser 7 in the same manner, and the solvent can be recovered smoothly.

If necessary, as shown in FIG. 1, pressure sensors 15 are respectively provided in the evaporated solvent discharge pipes 14 of the two evaporators 2 so that the amount of evaporated solvent discharged from the two evaporators 2 is the same. The evaporator 2 can be controlled by heating based on the pressure sensor 15, and the evaporated solvent can be discharged from the two evaporators 3 in the same manner .

  As the level sensors 12 and 13, in addition to the liquid level sensor of the float switch that detects the upper and lower surfaces of the liquid level, an ultrasonic sensor or a weight sensor is used to detect the supply of waste solvent and the amount of recovered solvent. In addition, the pressure sensor 15 can be controlled by using a Pitot tube or the like to detect the flow rate of the evaporating solvent, the pressure drop, and the like to control the outflow amount of the evaporating solvent.

In the above, the evaporative solvent discharge pipe 14 is connected to the two evaporators 2 in the same manner, but the evaporative solvent discharge pipe 14 is connected to the two evaporators 2 in a symmetrical manner as shown in FIG. Even if the solvent is evaporated under reduced pressure and the evaporated solvent is sucked, the evaporated solvent flows out from each of the evaporators 2 to the condenser 7 in the same manner, so that the two evaporators 2 smoothly. The solvent can be recovered.

  The solvent distillation recovery apparatus 1 configured as described above, after completing one distillation recovery in the distiller 2, drives the supply pump 5 to supply the waste solvent to the distiller 2, and performs distillation / condensation recovery of the solvent. Can be done continuously.

In the above, two evaporators 2 are arranged , the distiller 2 is the same with a small capacity of 50 to 100 liters, and the apparatus is totally inexpensive and running according to the amount of waste solvent treated by the customer. Ru can so as to reduce the cost.

  In addition, as a solvent, it can apply about the solvent based on the range of the meaning of the above-mentioned this invention, such as a hydrocarbon solvent, an alcohol solvent, and an apparatus in a required direction like FIG. 1, FIG. The automatic opening / closing valves 17, 18 and the like are appropriately provided so as to be able to flow out, and can be arranged according to the spirit of the present invention so as to operate the apparatus smoothly.

  FIG. 1 shows an embodiment of the present invention. A solvent distillation recovery apparatus 1 includes two identical 50 liter evaporators 2 arranged side by side and supplies a predetermined volume from a waste solvent supply tank 3 by a supply pump 5. The open / close valves 17 and 18 are controlled to open and close according to the amount of waste solvent treated, the solvent is evaporated by using one or two evaporators 2, and the evaporated solvent is condensed by the condenser 7. The solvent is recovered.

The evaporation solvent discharge pipe 14 from the evaporator 2 to the condenser 7 is connected to the two evaporators 2 in the same diameter, length, and pipe connection state, and the evaporator 2 is in a predetermined reduced pressure state by the vacuum pump 10. even if sucking the vaporized solvent under, and to flow out to the capacitor 7 in the same shape evaporated solvent from each of the evaporator 2.

  A pressure sensor 15 of a Pitot tube is provided in each of the two solvent evaporation pipes 14 of the two evaporators 2, and the discharge amount of the evaporation solvent from the two evaporators 2 is determined based on these pressure sensors 15. The evaporator 2 is heated and controlled to be the same.

  Thus, by installing two identical ones of 50 liters of small capacity, rather than installing one large capacity of 200 liters or more and recovering the solvent, The automatic opening / closing valves 17 and 18 can be controlled to open and close according to the amount of waste solvent treated, and one or two evaporators 2 can be used as appropriate, and the evaporator 2 can be mass-produced. The running cost can be reduced.

Further, by connecting the evaporated solvent discharge pipe 14 from the evaporator 2 to the condenser 7 to the two evaporators 2 in the same pipe, the state in which the evaporated solvent flows can be made the same. even sucked evaporated solvent under reduced pressure at 10, can flow out to the capacitor 7 evaporated solvent at the same like from each of the evaporator 2, it is possible to smoothly solvent recovery with a simple configuration.

FIG. 2 shows another embodiment of the present invention in which the evaporation solvent discharge pipe 14 of the evaporator 2 is connected to two identical evaporators 2 in a symmetrical manner. even sucked evaporated solvent the solvent was evaporated, in which the evaporating solvent from each of the evaporator 2 so as to flow out to the capacitor 7 in the same shape, smoothly solvent recovery of 2 groups from the evaporator 2.

  When the solvent distillation recovery apparatus 1 finishes one distillation recovery in the distiller 2, the supply pump 5 is used so that one or two evaporators 2 are appropriately used corresponding to the amount of waste solvent treated. To recover the solvent by supplying waste solvent to the distiller 2.

In this way, two evaporators 2 are arranged, so that the apparatus can be totally inexpensive and the running cost can be reduced in accordance with the amount of waste solvent treated by the customer.

    The present invention can be widely used for solvent distillation recovery of waste solvents such as painting, coating, and printing in the solvent field.

DESCRIPTION OF SYMBOLS 1 ... Solvent distillation collection apparatus 2 ... Evaporator 7 ... Condenser 10 ... Vacuum pump 14 ... Evaporative solvent discharge pipe 15 ... Pressure sensor

Claims (3)

Waste solvent is loaded into an evaporator, the solvent is evaporated under reduced pressure, the evaporated solvent is condensed by a condenser, and the solvent is recovered. The evaporator is of the same capacity of a small capacity of 50 to 100 liters. Two vaporizers are arranged to condense these evaporating solvents in common with one condenser, and the state in which the vapor solvent flows from the two evaporators to the condenser is the same in the evaporating solvent discharge pipe. A solvent distillation recovery method characterized by piping the same diameter, length, and pipe connection state, and recovering the solvent using one or two evaporators according to the amount of waste solvent treated.
Evaporators are arranged side by side with the same capacity, and these evaporating solvent discharge pipes are connected to the evaporators in the same symmetrical shape, and a vacuum pump for reducing the pressure in the evaporator is shared as one unit . The solvent distillation recovery method according to claim 1.   A pressure sensor is disposed in each of the evaporation solvent discharge pipes of the evaporator, and the evaporator is heated and controlled based on the pressure sensor so that the amount of the evaporation solvent discharged from the evaporator becomes the same. 3. The solvent distillation recovery method according to 1 or 2.

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