CN115531909A - A kind of triphenyl phosphite production equipment that can improve the recovery rate of phenol and reduce the concentration of tail gas - Google Patents

Abstract

The invention discloses triphenyl phosphite production equipment capable of improving phenol recovery rate and reducing tail gas concentration and a use method thereof, and relates to the technical field related to carbon filament flattening and winding. The time of the water vapor of the phenol solution reacting with water in the inner cavity of the reaction tube is prolonged, so that the water vapor of the phenol solution entering the inner cavity of the reaction tube is completely crystallized, the problem that multiple times of pressurization circulation is needed during phenol recovery in the prior art is solved, the complexity degree during phenol recovery is reduced, and the efficiency of phenol recovery is improved.

Description

A kind of triphenyl phosphite production that can improve phenol recovery rate and reduce tail gas concentration equipment

technical field

The invention relates to the related technical field of phenol recovery, in particular to a triphenyl phosphite production equipment capable of improving the recovery rate of phenol and reducing the concentration of tail gas and its use method.

Background technique

Triphenyl phosphite is an organic compound that is mainly used as an antioxidant stabilizer for high molecular polymers such as polyethylene, polypropylene, polyvinyl chloride, ABS resin, epoxy resin, synthetic rubber and polyester.

However, triphenyl phosphite is producing a large amount of phenol solution to esterify hydrogen chloride gas, and phenol, as a derivative chemical in the production of triphenyl phosphite, can be used as raw materials such as preservatives and insecticides in agriculture. Agricultural production is very important, and using the property that phenol can be miscible in water above 65 degrees Celsius, the solubility of phenol in water can be changed by changing the temperature to achieve phenol crystallization and recovery, which is a common method for phenol recovery in industrial production.

When the existing phenol is recovered, it is necessary to distill the phenol solution to allow the water in the phenol solution to form water vapor, so as to facilitate the recovery of phenol. When the traditional phenol recovery device recovers phenol, it is generally necessary to add phenol several times. pressure, so that the water vapor formed by the phenol solution can be recycled in the phenol recovery device for many times, so that a large part of the phenol can be recycled, which increases the cumbersomeness of phenol recovery and reduces the efficiency of phenol recovery. Therefore, a Triphenyl phosphite production equipment that can improve the recovery rate of phenol and reduce the concentration of tail gas.

Contents of the invention

The object of the present invention is to provide a kind of triphenyl phosphite production equipment and using method thereof that can improve phenol recovery rate and reduce tail gas concentration, to solve the comparatively loaded down with trivial details when phenol recovery proposed in the above-mentioned background technology, the problem of low recovery efficiency.

In order to achieve the above object, the present invention provides the following technical solutions: a kind of triphenyl phosphite production equipment and its use method that can improve the recovery rate of phenol and reduce the concentration of tail gas, including the recovery cylinder for phenol recovery, the interior of the recovery cylinder A crystallization module for phenol crystallization is provided.

The crystallization assembly includes a reaction tube and a first draft tube, the side wall of the first draft tube is fixedly connected to the inner wall of the recovery tube, one end of the reaction tube is fixedly connected to the end of the first draft tube away from the inner wall of the recovery tube, and the reaction tube The end away from the first guide tube is fixedly installed with a second guide tube, and the end of the second guide tube away from the reaction tube is provided with a guide hole communicating with its inner cavity.

The side wall of the recovery cylinder is fixedly inserted with a conduit communicating with its inner cavity, and the other end of the conduit is fixedly inserted with a reaction cylinder for tail gas recovery, and a recovery component for reducing the concentration of exhaust gas is arranged in the inner cavity of the reaction cylinder.

In a further embodiment, the crystallization assembly also includes an annular tube and a guide tube, the side wall of the annular tube is fixedly connected to the inner wall of the recovery cylinder, and the side of the annular tube close to the reaction tube communicates with the inner cavity of the reaction tube through the connecting tube , the conduction pipe is set in a U-shaped structure, and one end and both ends of the recovery cylinder are fixedly inserted into the side wall of the recovery cylinder, and the end of the conduction pipe away from the bottom of the inner chamber of the recovery cylinder is fixedly inserted into the side wall of the annular pipe. In addition, a first water pump for water circulation is installed on the side wall of the conduction pipe.

In a further embodiment, the reaction tube is curved.

In a further embodiment, the recovery assembly includes a bearing cylinder and a spray pipe, the bearing cylinder is fixedly installed in the inner cavity of the reaction cylinder, one end of the conduit inserted into the inner cavity of the reaction cylinder is inserted into the inner cavity of the bearing cylinder, and the spray pipe is inserted into the inner cavity of the bearing cylinder. Both ends of the shower pipe are plugged into the inner cavity of the reaction cylinder, and the side wall of the shower pipe is fixedly installed with a second water pump for the circulation of the reaction liquid.

In a further embodiment, the recovery assembly also includes a spray tube and a splitter plate, the spray tube is fixedly installed in the inner cavity of the reaction tube, and the end of the spray tube near the carrying tube is provided with a through hole for the flow of the reaction liquid, One end of the spray pipe close to the upper end surface of the reaction cylinder is fixedly connected to the side wall of the spray cylinder, and the diverter plate is fixedly installed in the inner cavity of the bearing cylinder.

In a further embodiment, the diameter of the outer wall of the carrying cylinder is the same as the diameter of the inner wall of the reaction cylinder, and the carrying cylinder is configured as a truncated conical structure.

In a further embodiment, the diameter of the spray cylinder is not smaller than the diameter of the bearing cylinder, and the end of the spray cylinder close to the bearing cylinder is parallel to the end surface of the bearing cylinder.

In a further embodiment, several splitter plates are fixedly installed in the inner cavity of the bearing cylinder, and the side walls of the several splitter plates are all fixedly connected to the side walls of the bearing cylinder.

In a further embodiment, both sides of the splitter plate are curved.

A kind of triphenyl phosphite production method that can improve phenol recovery rate and reduce tail gas concentration, comprises the steps:

A1. The water vapor of the phenol solution and the esterified hydrogen chloride gas are transported to the inner cavity of the reaction tube through the transfer tube, and then the water of 65 degrees Celsius is injected into the inner cavity of the annular tube by the first water pump. At this time, the water in the inner cavity of the annular tube Water enters the inner cavity of the reaction tube through the connecting tube, so that the water vapor of the phenol solution can be crystallized.

A2. The esterified hydrogen chloride gas entering the inner cavity of the reaction tube enters the inner cavity of the recovery cylinder through the diversion hole, and then enters the inner cavity of the carrying cylinder through the air pump. At this time, the splitter plate divides the esterified hydrogen chloride gas. Then start the second water pump to allow the alkaline aqueous solution to enter the inner cavity of the bearing cylinder, which can neutralize the alkaline aqueous solution and the esterified hydrogen chloride gas, reducing the concentration of the esterified hydrogen chloride gas discharged into the air, thereby achieving the goal of neutralizing the esterified hydrogen chloride gas. The purpose of reducing the concentration of esterified hydrogen chloride gas.

Compared with prior art, the beneficial effect of the present invention is:

The invention relates to a triphenyl phosphite production equipment capable of improving the recovery rate of phenol and reducing the concentration of tail gas and its use method. By transferring the water vapor of the phenol solution to the inner cavities of several reaction tubes, the phenol solution is further controlled. The water vapor is shunted to increase the time for the water vapor of the phenol solution to react with water in the inner cavity of the reaction tube, so that the water vapor of the phenol solution entering the inner cavity of the reaction tube is completely crystallized. The problem of multiple pressurization cycles reduces the cumbersomeness of phenol recovery and improves the efficiency of phenol recovery.

Description of drawings

Fig. 1 is the schematic diagram of main structure among the present invention;

Fig. 2 is the half-cut structure schematic diagram of recovery cylinder and reaction cylinder among the present invention;

Fig. 3 is a schematic diagram of the main structure of the splitter plate in the present invention;

Fig. 4 is the structural enlarged view of place A in Fig. 1 among the present invention;

Fig. 5 is the structural enlarged view of place B in Fig. 2 among the present invention;

Fig. 6 is an enlarged view of the structure at C in Fig. 2 in the present invention.

In the figure: 1. recovery cylinder; 2. conduction pipe; 3. conduit; 4. reaction cylinder; 5. spray pipe; 6. first diversion cylinder; 7. reaction pipe; 8. annular pipe; Two deflector cylinders; 10, spray cylinder; 11, splitter plate; 12, carrying cylinder.

detailed description

The embodiment of the present application solves the problems raised in the prior art by providing a triphenyl phosphite production equipment capable of improving the recovery rate of phenol and reducing the tail gas concentration and its use method; the technology in the embodiment of the present invention will be combined below The solution is clearly and completely described, and obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

Please refer to Fig. 1-6, present embodiment provides a kind of triphenyl phosphite production equipment and its using method that can improve phenol recovery rate and reduce tail gas concentration, comprise the recovery cylinder 1 that is used for phenol recovery, recovery cylinder 1 A crystallization assembly for phenol crystallization is provided inside of the tank, wherein the upper end surface of the recovery cylinder 1 is fixedly inserted with a transfer pipe, and the pressurized phenol forms water vapor and esterified hydrogen chloride gas into the inner cavity of the recovery cylinder 1, and then To achieve the purpose of centralized collection of water vapor of phenol solution and esterified hydrogen chloride gas.

The crystallization assembly includes a reaction tube 7 and a first guide cylinder 6, the side wall of the first guide cylinder 6 is fixedly connected to the inner wall of the recovery cylinder 1, and one end of the transmission tube is inserted into the inner cavity of the recovery cylinder 1 and inserted into the first In the inner cavity of the guide tube 6.

One end of the reaction tube 7 is fixedly connected to the end of the first flow guide tube 6 away from the inner wall of the recovery cylinder 1, and the end of the reaction tube 7 away from the first flow guide tube 6 is fixedly installed with a second flow guide tube 9, wherein the reaction tube 7 is in the One end of the first guide tube 6 is evenly installed with several, and the water vapor and the esterified hydrogen chloride gas entering the phenol solution in the inner chamber of the first guide tube 6 will enter the inner cavity of several reaction tubes 7, and then The water vapor of the phenol solution can be divided, and then the water vapor of the phenol solution can be solidified and crystallized by injecting water at 65 degrees Celsius into several reaction tubes 7. Multiple reaction tubes 7 can improve the recovery of the water vapor of the phenol solution. Efficiency solves the problem in the prior art that multiple pressurized cycles are required for phenol recovery, reduces the complexity of phenol recovery, and improves the efficiency of phenol recovery.

One end of the second guide tube 9 away from the reaction tube 7 is provided with a guide hole communicating with its own inner cavity, and the crystallized phenol and esterified hydrogen chloride gas entering the inner cavity of the reaction tube 7 will enter the second guide tube 9 In the inner cavity, the phenol crystallized through the diversion hole falls into the inner cavity of the recovery cylinder 1, and at the same time, the esterified hydrogen chloride gas will also enter the inner cavity of the recovery cylinder 1 through the diversion hole under the movement of molecules.

The side wall of the recovery cylinder 1 is fixedly inserted with a conduit 3 communicating with its own inner cavity, and the other end of the conduit 3 is fixedly inserted with a reaction cylinder 4 for exhaust gas recovery. The inner cavity of the reaction cylinder 4 is provided with a recovery device for reducing the concentration of exhaust gas. Assemblies, wherein the middle part of the conduit 3 is divided into two and connected with an air pump, through the continuous operation of the air pump, the esterified hydrogen chloride gas in the inner cavity of the recovery cylinder 1 can be absorbed into the inner cavity of the reaction cylinder 4 through the conduit 3, and the reaction cylinder 4 can be used to The esterified hydrogen chloride gas is collected centrally to prevent the esterified hydrogen chloride gas from entering the air and causing pollution to the external environment.

The crystallization assembly also includes an annular pipe 8 and a guide pipe 2, the side wall of the annular pipe 8 is fixedly connected to the inner wall of the recovery cylinder 1, and the side of the annular pipe 8 close to the reaction tube 7 communicates with the inner cavity of the reaction tube 7 through the connecting pipe , wherein a plurality of annular tubes 8 are fixedly installed in the inner cavity of the recovery cylinder 1, and the inner cavities of the plurality of annular tubes 8 communicate with each other through connecting pipes and the inner cavities of the plurality of reaction tubes 7.

The conduction pipe 2 is set in a U-shaped structure, and one end and both ends of the recovery cylinder 1 are fixedly inserted into the side wall of the recovery cylinder 1, wherein a large amount of water is injected into the inner cavity of the recovery cylinder 1, and the recovery cylinder 1 A heating coil for heating the water is installed inside, and the water can be kept at a constant temperature of 65 degrees Celsius through the heating coil.

One end of the conduction pipe 2 away from the bottom of the inner cavity of the recovery cylinder 1 is fixedly inserted into the side wall of the annular pipe 8, and the side wall of the conduction pipe 2 is equipped with a first water pump for water circulation, wherein the middle part of the conduction pipe 2 Divided into two, the middle part of the conduction pipe 2 is connected with the water outlet end and the water inlet end of the first water pump.

Further, when the water vapor of the phenol solution enters the inner cavity of the reaction tube 7, start the first water pump, so that the water in the inner cavity of the recovery cylinder 1 enters the inner cavity of the lead-through tube 2, and then passes through the lead-through The tube 2 enters the inner cavity of the annular tube 8, and then enters the inner cavity of the reaction tube 7 through the annular tube 8, so that the water and the water vapor of the phenol solution can be fused, and then the water vapor of the phenol solution can be crystallized. The reaction tube 7 can improve the efficiency of phenol crystallization.

At the same time, the water entering the inner cavity of the reaction tube 7 will enter the inner cavity of the recovery cylinder 1 again through the diversion hole under its own gravity, and mix with the water in the inner cavity of the recovery cylinder 1, thereby achieving the recycling of water resources , reducing the cost of phenol recovery.

The reaction tubes 7 are curved, and several of the reaction tubes 7 are curved in an "S" shape, so as to increase the distance that the water vapor of the phenol solution moves in the inner cavity of the reaction tube 7 and improve the flow of phenol in the inner cavity of the reaction tube 7. The reaction time with water further improves the efficiency of phenol recovery.

Embodiment two

See also Fig. 1-6, made further improvement on the basis of embodiment 1:

The recovery assembly includes a bearing cylinder 12 and a spray pipe 5, the bearing cylinder 12 is fixedly installed in the inner cavity of the reaction cylinder 4, and one end of the conduit 3 inserted into the inner cavity of the reaction cylinder 4 is inserted into the inner cavity of the bearing cylinder 12, and enters The esterified hydrogen chloride gas in the inner cavity of the conduit 3 will directly enter into the inner cavity of the bearing cylinder 12 , and the esterified hydrogen chloride gas will move toward the top of the bearing cylinder 12 under the movement of molecules.

Both ends of the spray pipe 5 are plugged into the inner chamber of the reaction cylinder 4, and the side wall of the spray pipe 5 is fixedly installed with a second water pump for the circulation of the reaction liquid, wherein the middle part of the spray pipe 5 is divided into two , the water outlet end and the water inlet end of the second water pump are fixedly connected with the middle part of the spray pipe 5, and there is an alkaline aqueous solution for reacting with the esterified hydrogen chloride gas in the inner cavity of the reaction cylinder 4 simultaneously.

Further, start the second water pump, let the alkaline aqueous solution in the inner cavity of the reaction cylinder 4 enter the inner cavity of the spray pipe 5, and enter the inner cavity of the carrying cylinder 12 from the top of the reaction cylinder 4 through the spray pipe 5 , neutralize the esterified hydrogen chloride gas in the inner cavity of the bearing cylinder 12, reduce the concentration of the esterified hydrogen chloride gas entering the air, reduce the pollution to the ring, and protect the environment.

Further, the alkaline aqueous solution can be recycled through the second water pump and the spray pipe 5, which reduces the waste of the alkaline aqueous solution and the cost of recovering the esterified hydrogen chloride gas.

The recovery assembly also includes a spray tube 10 and a splitter plate 11, the spray tube 10 is fixedly installed in the inner cavity of the reaction tube 4, and the end of the spray tube 10 near the bearing tube 12 is provided with a through hole for the flow of the reaction liquid, wherein The end of the spray tube 10 close to the bearing tube 12 is uniformly provided with several through holes.

One end of the spray pipe 5 close to the upper end surface of the reaction cylinder 4 is fixedly connected to the side wall of the spray cylinder 10, wherein the alkaline aqueous solution in the inner cavity of the spray pipe 5 enters the inner cavity of the spray cylinder 10 and enters the spray tube 10. The alkaline aqueous solution in the inner chamber of the shower cylinder 10 flows into the inner chamber of the carrying cylinder 12 through the through hole, and then reacts with the esterified hydrogen chloride gas in the inner chamber of the carrying cylinder 12 .

Further, the spray cylinder 10 can divert the aqueous solution through the through hole, so as to increase the area where the alkaline aqueous solution enters the inner cavity of the bearing cylinder 12, and improve the reaction rate of the alkaline aqueous solution and the esterified hydrogen chloride gas .

The diverter plate 11 is fixedly installed in the inner cavity of the bearing cylinder 12, wherein the diverter plate 11 can play the purpose of layering the inner cavity of the bearing cylinder 12, so as to divide the flow of the esterified hydrogen chloride gas, and further improve the efficiency of the esterified hydrogen chloride gas. The rate of reaction with alkaline aqueous solution.

The diameter of the outer wall of the bearing cylinder 12 is the same as the diameter of the inner wall of the reaction cylinder 4, so that the end face of the bearing cylinder 12 is parallel to the bottom of the inner cavity of the reaction cylinder 4, and the inner wall of the bearing cylinder 12 and the reaction cylinder 4 are bonded together to improve the installation of the bearing cylinder 12. stability.

The carrying cylinder 12 is set in a frustum-shaped structure to prevent the esterified hydrogen chloride gas from moving to the bottom of the carrying cylinder 12 as far as possible, and to gather the esterified hydrogen chloride gas to increase the reaction rate of the esterified hydrogen chloride gas and the alkaline aqueous solution.

The diameter of the spray cylinder 10 is not less than the diameter of the bearing cylinder 12, and one end of the spray cylinder 10 close to the bearing cylinder 12 is parallel to the end face of the bearing cylinder 12, so that the alkaline aqueous solution can completely enter the inner cavity of the bearing cylinder 12, further Improve the neutralization efficiency of alkaline aqueous solution and esterified hydrogen chloride gas.

Several diverter plates 11 are fixedly installed in the inner cavity of the bearing cylinder 12, and the side walls of several distributor plates 11 are fixedly connected with the side walls of the bearing cylinder 12. Layering facilitates the splitting of the esterified hydrogen chloride gas, further improving the neutralization efficiency of the esterified hydrogen chloride gas and the alkaline solution.

Both sides of the splitter plate 11 are curved, and several splitter plates 11 are arranged in an “S” shape, so as to increase the time for the esterified hydrogen chloride gas to move between two adjacent splitter plates 11 and improve the efficiency of esterification. Efficiency and reaction efficiency of hydrogen chloride gas and alkaline aqueous solution reaction, absorb esterified hydrogen chloride gas as much as possible.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a can improve phenol rate of recovery and reduce tail gas concentration's triphenyl phosphite production facility, includes a recovery section of thick bamboo (1) that is used for retrieving phenol, its characterized in that: a crystallization component for crystallizing phenol is arranged in the recovery cylinder (1); the crystallization assembly comprises a reaction tube (7) and a first guide cylinder (6), the side wall of the first guide cylinder (6) is fixedly connected with the inner wall of the recovery cylinder (1), one end of the reaction tube (7) is fixedly connected with one end, far away from the inner wall of the recovery cylinder (1), of the first guide cylinder (6), a second guide cylinder (9) is fixedly installed at one end, far away from the first guide cylinder (6), of the reaction tube (7), and a guide hole communicated with an inner cavity of the second guide cylinder (9) is formed in one end, far away from the reaction tube (7), of the second guide cylinder (9); the side wall of the recovery cylinder (1) is fixedly inserted with a guide pipe (3) communicated with the inner cavity of the recovery cylinder, the other end of the guide pipe (3) is fixedly inserted with a reaction cylinder (4) for recovering tail gas, and a recovery assembly for reducing the concentration of the tail gas is arranged in the inner cavity of the reaction cylinder (4).

2. The apparatus of claim 1 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the crystallization subassembly still includes annular tube (8) and conduction pipe (2), the lateral wall of annular tube (8) and the inner wall fixed connection of recovery cylinder (1), and annular tube (8) are close to one side of reaction tube (7) and pass through the inner chamber intercommunication of connecting pipe and reaction tube (7), conduction pipe (2) set up to U type structure, and the both ends of one end and recovery cylinder (1) all peg graft with the lateral wall of recovery cylinder (1) is fixed, the one end of recovery cylinder (1) inner chamber bottom and the fixed grafting of lateral wall of annular tube (8) are kept away from in conduction pipe (2), and the lateral wall of conduction pipe (2) installs the first water pump that is used for rivers circulation to flow.

3. The apparatus of claim 2 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the reaction tube (7) is arranged in a bending way.

4. The apparatus of claim 1 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the recycling assembly comprises a bearing cylinder (12) and a spraying pipe (5), the bearing cylinder (12) is fixedly installed in an inner cavity of the reaction cylinder (4), one end, inserted into the inner cavity of the bearing cylinder (12), of the guide pipe (3) is inserted into the inner cavity of the reaction cylinder (4), two ends of the spraying pipe (5) are inserted into the inner cavity of the reaction cylinder (4), and a second water pump used for reaction liquid circulation is fixedly installed on the side wall of the spraying pipe (5).

5. The apparatus of claim 4 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the recycling assembly further comprises a spraying barrel (10) and a flow distribution plate (11), the spraying barrel (10) is fixedly installed in the inner cavity of the reaction barrel (4), one end, close to the bearing barrel (12), of the spraying barrel (10) is provided with a through hole for flowing of reaction liquid, one end, close to the upper end face of the reaction barrel (4), of the spraying pipe (5) is fixedly connected with the side wall of the spraying barrel (10), and the flow distribution plate (11) is fixedly installed in the inner cavity of the bearing barrel (12).

6. The apparatus of claim 5 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the diameter of the outer wall of the bearing cylinder (12) is the same as that of the inner wall of the reaction cylinder (4), and the bearing cylinder (12) is of a circular truncated cone-shaped structure.

7. The apparatus of claim 6 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: the diameter of the spray cylinder (10) is not less than that of the bearing cylinder (12), and one end of the spray cylinder (10) close to the bearing cylinder (12) is parallel to the end face of the bearing cylinder (12).

8. The apparatus of claim 5 for triphenyl phosphite production equipment capable of increasing phenol recovery rate and reducing tail gas concentration, wherein: the inner cavity of the bearing cylinder (12) of the flow distribution plate (11) is fixedly provided with a plurality of flow distribution plates, and the side walls of the flow distribution plates (11) are fixedly connected with the side wall of the bearing cylinder (12).

9. The apparatus of claim 8 for producing triphenyl phosphite with improved phenol recovery and reduced tail gas concentration, wherein: both sides of the flow distribution plate (11) are arranged in a bending mode.

10. A can improve the phenol recovery rate and reduce the triphenyl phosphite production method of the concentration of end gas, according to adopting claim 1 a can improve the phenol recovery rate and reduce the triphenyl phosphite production equipment of the concentration of end gas, characterized by, including the following step:

a1, conveying water vapor of a phenol solution and esterified hydrogen chloride gas into an inner cavity of a reaction tube (7) through a conveying tube, then injecting 65-DEG C water into the inner cavity of an annular tube (8) through a first water pump, and enabling the water in the inner cavity of the annular tube (8) to enter the inner cavity of the reaction tube (7) through a connecting tube, so that the water vapor of the phenol solution can be crystallized;

a2, the hydrogen chloride gas of esterifying that enters into reaction tube (7) inner chamber enters into the inner chamber of recovery drum (1) through the water conservancy diversion hole, then enter into the inner chamber of bearing a container (12) through the air pump, flow distribution plate (11) are shunted the hydrogen chloride gas of esterifying this moment, then start the second water pump, let alkaline aqueous solution enter into the inner chamber of bearing a container (12), alright in order to let alkaline aqueous solution and the hydrogen chloride gas of esterifying neutralize, the concentration that the hydrogen chloride gas of esterifying was discharged to the air has been reduced, and then reach the purpose that reduces the hydrogen chloride gas concentration of esterifying.

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