CN220047112U - Diamino maleonitrile reaction solvent low temperature evaporation recovery system - Google Patents

Diamino maleonitrile reaction solvent low temperature evaporation recovery system Download PDF

Info

Publication number
CN220047112U
CN220047112U CN202321515682.0U CN202321515682U CN220047112U CN 220047112 U CN220047112 U CN 220047112U CN 202321515682 U CN202321515682 U CN 202321515682U CN 220047112 U CN220047112 U CN 220047112U
Authority
CN
China
Prior art keywords
flash evaporation
evaporator
reaction
reaction solvent
crystallization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202321515682.0U
Other languages
Chinese (zh)
Inventor
杨阳
肖艳
冯兴建
尹克明
王�锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Energy Investment Yongli Chemical Co ltd
Original Assignee
Sichuan Energy Investment Yongli Chemical Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Energy Investment Yongli Chemical Co ltd filed Critical Sichuan Energy Investment Yongli Chemical Co ltd
Priority to CN202321515682.0U priority Critical patent/CN220047112U/en
Application granted granted Critical
Publication of CN220047112U publication Critical patent/CN220047112U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The utility model relates to the technical field of diaminomaleonitrile reaction solvents, and discloses a low-temperature evaporation recovery system of a diaminomaleonitrile reaction solvent, which comprises a flash evaporation evaporator, wherein a flash evaporation mechanism is arranged in the flash evaporation evaporator, and the top of the flash evaporation evaporator is in an inverted cone shape; the flash evaporation mechanism comprises a motor, a rotating rod, a connecting rod and a scraping plate, wherein the motor is connected with the flash evaporation device, an output rod of the motor is connected with the rotating rod, the rotating rod is connected with the connecting rod, and the connecting rod is connected with the scraping plate. The method has the advantages that the diaminomaleonitrile reaction solvent with thermal instability is recovered by adopting a flash evaporation mechanism in a flash evaporation mode, the reaction solvent can be separated out at a lower temperature, the industrial water added in the crystallization process of the crystallization kettle is reduced under the condition of not reducing the product yield, the amount of crystallization centrifugate is further reduced, the amount of the crystallization centrifugate treated by a distillation recovery solvent system is reduced, and the treatment capacity of distillation condensate in a wastewater treatment system is reduced.

Description

Diamino maleonitrile reaction solvent low temperature evaporation recovery system
Technical Field
The utility model relates to the technical field of diaminomaleonitrile reaction solvents, in particular to a low-temperature evaporation recovery system for a diaminomaleonitrile reaction solvent.
Background
In the production of diaminomaleonitrile, the long-time heating of the cyanation reaction solution accelerates the generation of polymer, resulting in reduced yield of the target product, and the selected solvent is decomposed in a heated state to cause material loss. The process system adopts the steps that process water in a crystallization kettle enters cyanide reaction liquid, diaminomaleonitrile is obtained through cooling crystallization and centrifugation, the centrifugated mother liquid enters a distillation recovery system to recover reaction solvent, and the distilled condensate is treated and discharged by a wastewater treatment system. The waste water of the cyanidation reaction crystallization is large in the production process, the crystallization time is long, and the energy consumption is high; the crystallization centrifugate is fed into the distillation recovery system to consume energy in a large amount of distillation treatment capacity, and simultaneously, the amount of the generated condensation waste water is large, the three wastes are treated in a large amount, so that the energy-saving and environment-friendly pressure of the production system is increased.
In order to overcome the defects, a reaction solvent low-temperature evaporation recovery system is combined with a crystallization device to improve the product yield, reduce the production energy consumption and reduce the wastewater production. The core is that a reaction solvent low-temperature evaporation recovery system is added, after the solvent is recovered, materials enter crystallization equipment under the condition of keeping fluidity, and the water consumption for dilution and crystallization is reduced, so that the dissolved product amount in crystallization wastewater is reduced.
Disclosure of Invention
The utility model aims to provide a low-temperature evaporation recovery system for a diaminomaleonitrile reaction solvent, which is used for solving the problems in the background art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the low-temperature evaporation recovery system for the diaminomaleonitrile reaction solvent comprises a flash evaporation evaporator, wherein a flash evaporation mechanism is arranged in the flash evaporation evaporator, and the top of the flash evaporation evaporator is in an inverted cone shape;
the flash evaporation mechanism comprises a motor, a rotating rod, a connecting rod and a scraping plate, wherein the motor is connected with the flash evaporation evaporator, an output rod of the motor is connected with the rotating rod, the rotating rod is connected with the connecting rod, the connecting rod is connected with the scraping plate, the scraping plate side scrapes the inner wall of the flash evaporation evaporator, a temperature controller is arranged in the flash evaporation evaporator, a jacket is connected to the surface of the flash evaporation evaporator, a hot water inlet pipe of the jacket is connected to the jacket, the temperature in the hot water inlet pipe of the jacket is controlled to be about 80 ℃, and the temperature in the flash evaporation evaporator is controlled through a jacket clamp.
Preferably, the left side of the flash evaporation evaporator is connected with a cyanide reactant feed pipe, the cyanide reactant feed pipe continuously flows the cyanide reactant into the flash evaporation evaporator in a certain vacuum state, the internal temperature of the flash evaporation evaporator is lower than 60 ℃ to evaporate the reaction solvent, the bottom of the flash evaporation evaporator is connected with a flash evaporation heavy phase receiving tank, and the reaction heavy phase liquid in the flash evaporation evaporator enters the flash evaporation heavy phase receiving tank.
Preferably, the flash evaporation heavy phase receiving tank is connected with a first material transferring pump, the first material transferring pump is connected with a connecting pipe, the bottom surface of the connecting pipe is connected with a crystallization kettle, the flash evaporation heavy phase receiving tank enters the crystallization kettle through the first material transferring pump, and materials in the flash evaporation heavy phase receiving tank are conveniently transferred into the crystallization kettle through the first material transferring pump.
Preferably, the crystallization kettle is connected with a process water inlet pipe, the bottom surface of the crystallization kettle is connected with a discharge pipe, the process water inlet pipe is added into the crystallization kettle to be stirred, cooled and crystallized, and after the crystallization in the crystallization kettle is completed, the crystallization liquid is subjected to solid-liquid separation treatment.
Preferably, the top surface of the flash evaporation evaporator is connected with a reaction solvent steam pipe, the reaction solvent steam pipe is connected with a condenser, the right side of the condenser is connected with a vacuum system through a vacuum connecting pipe, and solvent steam generated by distillation in the flash evaporation evaporator is led into the condenser through the reaction solvent steam pipe and then condensed and recovered.
Preferably, the bottom surface of the condenser is connected with a recovery solvent receiving tank, and the recovery solvent in the recovery solvent receiving tank is recycled to the polymerization reaction kettle for preparing reaction solvent, and meanwhile, the utilization rate of the recovery solvent is improved.
Preferably, the bottom of the recovery solvent receiving tank is connected with a second transfer pump, and the top surface of the second transfer pump is connected with a decyanation reaction batching pipe.
Compared with the prior art, the utility model has the beneficial effects that: according to the low-temperature evaporation recovery system for the diaminomaleonitrile reaction solvent, the diaminomaleonitrile reaction solvent with thermal instability is recovered by a flash evaporation mechanism in a flash evaporation mode, so that the reaction solvent can be separated out at a lower temperature, the industrial water added in the crystallization process of a crystallization kettle is reduced under the condition that the product yield is not reduced, the amount of crystallization centrifugate is further reduced, the amount of crystallization centrifugate treated by a distillation recovery solvent system is reduced, and the treatment amount of distillation condensate in a wastewater treatment system is reduced; by adopting the low-temperature evaporation recovery system of the diaminomaleonitrile reaction solvent, the waste water amount can be reduced by 80 percent, the energy consumption of the crystallization waste liquid recovery system is reduced in a same ratio, the three wastes are simultaneously reduced, the defects of the original production system are overcome under the condition of maintaining the product yield, and the purposes of improving the process system level, saving energy, reducing consumption and protecting environment are achieved.
Drawings
FIG. 1 is a schematic diagram of the overall structure connection of the present utility model;
FIG. 2 is a schematic diagram of a flash evaporator connection of the present utility model.
In the figure: the flash evaporation device comprises a flash evaporation device 1, a flash evaporation mechanism 2, a motor 201, a rotating rod 202, a connecting rod 203, a scraping plate 204, a jacket 205, a jacket hot water inlet pipe 206, a temperature controller 207, a flash evaporation heavy phase receiving tank 3, a first material transferring pump 4, a connecting pipe 5, a crystallization kettle 6, a process water inlet pipe 7, a discharge pipe 8, a reaction solvent steam pipe 9, a condenser 10, a vacuum system connecting pipe 11, a recovery solvent receiving tank 12, a second material transferring pump 13, a decyanation reaction material distributing pipe 14 and a cyanidation reaction material feeding pipe 15.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-2, the present utility model provides a technical solution: the low-temperature evaporation recovery system for the diaminomaleonitrile reaction solvent comprises a flash evaporation evaporator 1, wherein a flash evaporation mechanism 2 is arranged in the flash evaporation evaporator 1, and the top of the flash evaporation evaporator 1 is in an inverted cone shape;
the flash evaporation mechanism 2 comprises a motor 201, a rotating rod 202, a connecting rod 203 and a scraping plate 204, wherein the motor 201 is connected with the flash evaporation evaporator 1, an output rod of the motor 201 is connected with the rotating rod 202, the rotating rod 202 is connected with the connecting rod 203, the connecting rod 203 is connected with the scraping plate 204, the side surface of the scraping plate 204 scrapes the inner wall of the flash evaporation evaporator 1, a temperature controller 207 is arranged in the flash evaporation evaporator 1, a jacket 205 is connected to the surface of the flash evaporation evaporator 1, the jacket 205 is connected with a jacket hot water inlet pipe 206, the temperature in the jacket hot water inlet pipe 206 is controlled to be about 80 ℃, and the flash evaporation mechanism 2 is used for carrying out the flash evaporation; the left side of the flash evaporation evaporator 1 is connected with a cyanation reaction material feeding pipe 15, the cyanation reaction liquid continuously flows into the flash evaporation evaporator 1 under a certain vacuum state through the cyanation reaction material feeding pipe 15, the internal temperature of the flash evaporation evaporator 1 is lower than 60 ℃ to evaporate solvent, the bottom of the flash evaporation evaporator 1 is connected with a flash evaporation heavy phase receiving tank 3, the reaction heavy phase liquid in the flash evaporation evaporator 1 enters the flash evaporation heavy phase receiving tank 3, the flash evaporation heavy phase receiving tank 3 is connected with a first transfer pump 4, the first transfer pump 4 is connected with a connecting pipe 5, the bottom surface of the connecting pipe 5 is connected with a crystallization kettle 6, the flash evaporation heavy phase receiving tank 3 enters the crystallization kettle 6 through the first transfer pump 4, the crystallization kettle 6 is connected with a process water inlet pipe 7, the bottom surface of the crystallization kettle 6 is connected with a discharge pipe 8, the process water inlet pipe 7 is added into the crystallization kettle 6 to be stirred and cooled for crystallization, after the crystallization in the crystallization kettle 6 is completed, the crystallization liquid is subjected to solid-liquid separation treatment, the top surface of the flash evaporation evaporator 1 is connected with a reaction solvent steam pipe 9, the reaction solvent steam pipe 9 is connected with a condenser 10, solvent steam generated by distillation in the flash evaporation evaporator 1 is led into the condenser 10 through the reaction solvent steam pipe 9 and then condensed and recovered, the right side of the condenser 10 is connected with a vacuum system connecting pipe 11, the bottom surface of the condenser 10 is connected with a recovery solvent receiving tank 12, the recovery solvent in the recovery solvent receiving tank 12 is recycled to a polymerization reaction kettle for preparing reaction solvent, the bottom of the recovery solvent receiving tank 12 is connected with a second transfer pump 13, the top surface of the second transfer pump 13 is connected with a decyanation reaction batching pipe 14, a diaminomaleonitrile reaction solvent low-temperature evaporation recovery system is adopted, the waste water amount can be reduced by 80%, the energy consumption of a crystallization waste liquid recovery system is reduced in the same proportion, and under the conditions of reducing three wastes and maintaining the product yield, solves the defects of the original production system, and achieves the purposes of improving the level of the process system, saving energy, reducing consumption and protecting environment.
When the device is used, the cyanidation reaction liquid continuously flows into the flash evaporation evaporator 1 under a certain vacuum state through the cyanidation reaction material feeding pipe 15, the solvent is evaporated under the condition that the internal temperature of the flash evaporation evaporator 1 is lower than 60 ℃, solvent vapor generated by distillation is condensed and recovered through the condenser 10, the recovered solvent is used for preparing reaction solvent in a polymerization reaction kettle, the reaction heavy phase liquid enters the flash evaporation heavy phase receiving tank 3, the reaction heavy phase liquid enters the crystallization kettle 6 through the first transfer pump 4, process water is added into the crystallization kettle 6 through the process water inlet pipe 7, the temperature is reduced and crystallized, after crystallization is completed, the crystallization liquid is subjected to solid-liquid separation treatment, the filtrate is distilled and recovered in the next procedure, the recovered solvent is recycled for the cyanidation reaction preparation, and meanwhile, the distilled condensed water liquid is treated by the wastewater treatment system.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The low-temperature evaporation recovery system for the diaminomaleonitrile reaction solvent comprises a flash evaporator (1) and is characterized in that: a flash evaporation mechanism (2) is arranged in the flash evaporation evaporator (1), and the top of the flash evaporation evaporator (1) is in an inverted cone shape;
the flash evaporation mechanism (2) comprises a motor (201), a rotating rod (202), a connecting rod (203) and a scraping plate (204), wherein the motor (201) is connected with the flash evaporation evaporator (1), an output rod of the motor (201) is connected with the rotating rod (202), the rotating rod (202) is connected with the connecting rod (203), the connecting rod (203) is connected with the scraping plate (204), the side surface of the scraping plate (204) scrapes the inner wall of the flash evaporation evaporator (1), a temperature controller (207) is arranged inside the flash evaporation evaporator (1), a jacket (205) is connected to the surface of the flash evaporation evaporator (1), a jacket hot water inlet pipe (206) is connected to the jacket hot water inlet pipe (206), and the inner temperature of the jacket hot water inlet pipe (206) is controlled at about 80 ℃.
2. The diaminomaleonitrile reaction solvent cryogenic vapor recovery system as defined in claim 1, wherein: the novel cyanide reaction kettle is characterized in that a cyanide reaction material feeding pipe (15) is connected to the left side of the flash evaporation evaporator (1), cyanide reaction liquid continuously flows into the flash evaporation evaporator (1) in a certain vacuum state through the cyanide reaction material feeding pipe (15), the internal temperature of the flash evaporation evaporator (1) is lower than 60 ℃ for evaporating solvent, the bottom of the flash evaporation evaporator (1) and a flash evaporation heavy phase receiving tank (3), and the reaction heavy phase liquid in the flash evaporation evaporator (1) enters the flash evaporation heavy phase receiving tank (3).
3. The diaminomaleonitrile reaction solvent cryogenic vapor recovery system as defined in claim 2, wherein: the flash evaporation heavy phase receiving tank (3) is connected with the first material transferring pump (4), the first material transferring pump (4) is connected with the connecting pipe (5), the bottom surface of the connecting pipe (5) is connected with the crystallization kettle (6), and the flash evaporation heavy phase receiving tank (3) enters the crystallization kettle (6) through the first material transferring pump (4).
4. A diaminomaleonitrile reaction solvent cryogenic vapor recovery system in accordance with claim 3, wherein: the crystallization kettle (6) is connected with a process water inlet pipe (7), the bottom surface of the crystallization kettle (6) is connected with a discharge pipe (8), process water is added into the crystallization kettle (6) through the process water inlet pipe (7), the temperature is reduced and crystallization is carried out through stirring, and after the crystallization in the crystallization kettle (6) is finished, the crystallization liquid is subjected to solid-liquid separation treatment.
5. The diaminomaleonitrile reaction solvent cryogenic vapor recovery system as defined in claim 1, wherein: the top surface of the flash evaporation evaporator (1) is connected with a reaction solvent steam pipe (9), the reaction solvent steam pipe (9) is connected with a condenser (10), and the right side of the condenser (10) is connected with a vacuum system connecting pipe (11).
6. The low temperature evaporation recovery system for diaminomaleonitrile reaction solvent as defined in claim 5, wherein: the bottom surface of the condenser (10) is connected with a recovery solvent receiving tank (12), and the recovery solvent in the recovery solvent receiving tank (12) is recycled to the polymerization reaction kettle for preparing reaction solvent.
7. The low temperature evaporation recovery system for diaminomaleonitrile reaction solvent as defined in claim 6, wherein: the bottom of the recovery solvent receiving tank (12) is connected with a second transfer pump (13), and the top surface of the second transfer pump (13) is connected with a decyanation reaction batching pipe (14).
CN202321515682.0U 2023-06-14 2023-06-14 Diamino maleonitrile reaction solvent low temperature evaporation recovery system Active CN220047112U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321515682.0U CN220047112U (en) 2023-06-14 2023-06-14 Diamino maleonitrile reaction solvent low temperature evaporation recovery system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321515682.0U CN220047112U (en) 2023-06-14 2023-06-14 Diamino maleonitrile reaction solvent low temperature evaporation recovery system

Publications (1)

Publication Number Publication Date
CN220047112U true CN220047112U (en) 2023-11-21

Family

ID=88762353

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321515682.0U Active CN220047112U (en) 2023-06-14 2023-06-14 Diamino maleonitrile reaction solvent low temperature evaporation recovery system

Country Status (1)

Country Link
CN (1) CN220047112U (en)

Similar Documents

Publication Publication Date Title
CN108103112B (en) Process for producing fuel ethanol by using corn starch as raw material
CN101544437B (en) Process method for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride
CN102211992B (en) Process for reclaiming dibasic acid from adipic acid production waste solution
CN101445449A (en) Production method and device for sodium gluconate energy-saving triple effect concentration and crystallization
CN102079512A (en) Process for recovering sulfuric acid and sulfate from waste acid generated in preparation of titanium dioxide by using sulfuric acid method
CN220047112U (en) Diamino maleonitrile reaction solvent low temperature evaporation recovery system
CN106397180A (en) Aspirin residual liquid treatment process
CN113234056A (en) Preparation method and preparation device of crude lactide and prepared crude lactide
CN113318677A (en) DOTP production device and process
CN217459115U (en) Industrial salt recovery system of cellulose ether waste water
CN115571920A (en) Method for obtaining manganese sulfate crystals from solution containing manganese sulfate
CN103043841A (en) ADCA (Azodicarbonamide) foaming agent liquid waste disposal process
CN105294466A (en) Technology for producing high-purity aminoacetic acid based on urotropine cyclic utilization technology
CN214456896U (en) Waste water treatment and recovery device in PTA (pure terephthalic acid) production industry
CN102617381B (en) Method for evaporating hydroxybenzene glycine
CN217895359U (en) Sulfuric acid process titanium dioxide spent acid enrichment facility
CN204981212U (en) Evaporative concentration system of medicine waste water
CN115872482B (en) Normal-temperature desalting and resource utilization method and device for glutamic acid concentrated mother solution
CN115594343B (en) Treatment method of furfural wastewater
CN219792756U (en) Device for extracting sodium acetate from PTA continuous wastewater
CN213375179U (en) Ammonium chloride recovery unit
CN220989729U (en) Clear solution crystallization system of sodium chloride
CN220078674U (en) Bisphenol A waste water resource utilization equipment
CN213295063U (en) Recovery device for treating naphthylmethyl ether sulfuric acid mother liquor
CN103086902B (en) Method of recovering ammonia gas for production of glycine through alcohol phase system

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant