An efficient N,N-dimethylaniline catalyst recovery system

Abstract

The utility model relates to chemical production technology, show a kind of efficient N,N-dimethyl aniline catalyst recovery system, including hydrolysis kettle, lye high tank, neutralization kettle, layered tank, aqueous aniline receiving tank, distillation kettle and N,N-dimethyl aniline receiving tank, hydrolysis kettle is connected with neutralization kettle by lye high tank, and neutralization kettle is connected with acid liquid lifting pump by pipeline, and the gas outlet of the top of neutralization kettle is connected with neutralization condenser, and the liquid outlet of neutralization condenser is connected to neutralization kettle by pipeline, and the discharge outlet of neutralization kettle is connected with layered tank, and heating pipe is located in layered tank, and the top discharge outlet of layered tank is connected with aqueous aniline receiving tank, and aqueous aniline receiving tank is connected with distillation kettle by aqueous aniline lifting pump, and the discharge outlet of distillation kettle bottom is connected with N,N-dimethyl aniline receiving tank by pipeline, and the bottom outlet of N,N-dimethyl aniline receiving tank is connected to chlorination kettle by N,N-dimethyl aniline lifting pump.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and more specifically, to a highly efficient N,N-dimethylaniline catalyst recovery system. Background Technology

[0002] In chemical production, N,N-dimethylaniline is commonly used as a catalyst. However, its recovery process suffers from numerous problems, such as low recovery efficiency, high energy consumption, and high impurity content, leading to increased production costs and environmental pollution. Traditional recovery systems typically employ simple distillation or extraction methods, which are insufficient for achieving efficient and low-cost recovery. Therefore, developing a highly efficient and environmentally friendly N,N-dimethylaniline catalyst recovery system is of significant practical importance. Utility Model Content

[0003] This application provides a highly efficient N,N-dimethylaniline catalyst recovery system, which solves the problem that traditional recovery systems typically use simple distillation or extraction methods, making it difficult to achieve efficient and low-cost recovery.

[0004] This application provides a high-efficiency N,N-dimethylaniline catalyst recovery system, including a hydrolysis reactor, an alkaline high-level tank, a neutralization reactor, a layering tank, an aqueous aniline receiving tank, a distillation reactor, and an N,N-dimethylaniline receiving tank. The hydrolysis reactor is connected to the neutralization reactor via the alkaline high-level tank. The neutralization reactor is connected to an acid booster pump via a pipeline. A neutralization condenser is connected to the gas outlet at the top of the neutralization reactor. The liquid outlet of the neutralization condenser is connected to the neutralization reactor via a pipeline. The discharge outlet of the neutralization reactor is connected to the layering tank. The layering tank is equipped with a heating tube. The discharge outlet at the top of the layering tank is connected to the aqueous aniline receiving tank. The aqueous aniline receiving tank is connected to the distillation reactor via the aqueous aniline booster pump. The discharge outlet at the bottom of the distillation reactor is connected to the N,N-dimethylaniline receiving tank via a pipeline. The bottom outlet of the N,N-dimethylaniline receiving tank is connected to a chlorination reactor via the N,N-dimethylaniline booster pump.

[0005] Preferably, the neutralization vessel is equipped with a pH detector.

[0006] Preferably, the outlet of the stratified tank is connected to a wastewater recovery tank via a pipe.

[0007] Preferably, the wastewater recovery tank is connected to a wastewater triple-effect device via a wastewater recovery pump.

[0008] Preferably, both the distillation vessel and the heating tube are provided with a steam inlet pipe and a steam outlet pipe.

[0009] Preferably, both the neutralization vessel and the distillation vessel are equipped with a stirring device.

[0010] Preferably, both the neutralization vessel and the distillation vessel are provided with cooling water inlet pipes and cooling water outlet pipes on their jackets.

[0011] Preferably, the outlet of the distillation vessel is connected to a first condenser via a pipe, the outlet of the first condenser is connected to a second condenser via a pipe, and the liquid outlets of the first condenser and the second condenser are connected to a distilled water receiving tank via pipes.

[0012] Preferably, the outlet of the distilled water receiving tank is connected to a water circulation pipe.

[0013] As can be seen from the above technical solution, this application provides a highly efficient N,N-dimethylaniline catalyst recovery system. During use, the aqueous phase material containing N,N-dimethylaniline salt is sent from the hydrolysis reactor to the neutralization reactor via an alkaline high-level tank. Liquid alkali from the high-level tank and acid pumped in from the acid booster pump are added to the neutralization reactor to adjust the pH to 11, resulting in a neutralization reaction that produces trisodium phosphate, sodium chloride, and N,N-dimethylaniline. After the neutralization reaction is complete, the stirring device is stopped, and the mixture is allowed to stand for 30 minutes to separate into layers. The aqueous layer carries a small amount of... Aniline enters a stratification tank for static separation. The wastewater at the bottom of the stratification tank enters a wastewater recovery tank, where trisodium phosphate is recovered through a three-effect wastewater treatment system. The N,N-dimethylaniline at the top of the stratification tank enters a hydrous aniline receiving tank, and is then pumped into a distillation kettle for distillation recovery. The recovered N,N-dimethylaniline then enters the N,N-dimethylaniline receiving tank from the bottom of the distillation kettle through a pipeline. The N,N-dimethylaniline catalyst in the receiving tank is then pumped back into the chlorination kettle for reuse, thereby reducing production costs.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This invention achieves efficient recovery of N,N-dimethylaniline through neutralization reaction and layer separation, significantly improving the recovery rate.

[0015] 2. This utility model effectively reduces impurity content and improves product quality through layering and distillation.

[0016] 3. The wastewater of this utility model is treated by a triple-effect device, which reduces environmental pollution.

[0017] 4. The N,N-dimethylaniline recovered by this invention can be recycled back into production, reducing production costs.

[0018] In summary, a highly efficient N,N-dimethylaniline catalyst recovery system achieves efficient recovery of N,N-dimethylaniline through neutralization reaction and stratification separation, significantly improving the recovery rate. Through stratification and distillation, the impurity content is effectively reduced, improving product quality. The recovered N,N-dimethylaniline can be recycled back into production, reducing production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 A schematic diagram of a highly efficient N,N-dimethylaniline catalyst recovery system provided by this utility model; Figure 2 This is a schematic diagram of a highly efficient N,N-dimethylaniline catalyst recovery system provided by this utility model.

[0021] The reference numerals in the detailed embodiments are as follows: 1. Hydrolysis kettle; 2. Alkali high-level tank; 3. Neutralization kettle; 4. Separation tank; 5. Hydrous aniline receiving tank; 6. Distillation kettle; 7. N,N-Dimethylaniline receiving tank; 8. Acid booster pump; 9. Neutralization condenser; 10. Wastewater recovery tank; 11. Wastewater booster pump; 12. Wastewater triple-effect device; 13. Hydrous aniline booster pump; 14. First condenser; 15. Second condenser; 16. Distilled water receiving tank; 17. Water circulation pipe; 18. N,N-Dimethylaniline booster pump; 19. Chlorination kettle; 20. Heating pipe; 21. Cooling water inlet pipe; 22. Cooling water outlet pipe; 23. Steam inlet pipe; 24. Steam outlet pipe; 25. Stirring device; 26. pH detector. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] See Figure 1-2This application discloses a highly efficient N,N-dimethylaniline catalyst recovery system. To address the problem that traditional recovery systems typically employ simple distillation or extraction methods, which are insufficient for achieving efficient and low-cost recovery, this application proposes a highly efficient N,N-dimethylaniline catalyst recovery system. Through neutralization reaction and layer separation, highly efficient recovery of N,N-dimethylaniline is achieved, significantly improving the recovery rate. Layer separation and distillation effectively reduce impurity content, improving product quality. The recovered N,N-dimethylaniline can be recycled back into production, reducing production costs.

[0024] Specifically, a high-efficiency N,N-dimethylaniline catalyst recovery system includes a hydrolysis reactor 1, an alkali high-level tank 2, a neutralization reactor 3, a separation tank 4, an aqueous aniline receiving tank 5, a distillation reactor 6, and an N,N-dimethylaniline receiving tank 7. The hydrolysis reactor 1 receives the aqueous phase material containing N,N-dimethylaniline salt. The hydrolysis reactor 1 is connected to the neutralization reactor 3 via the alkali high-level tank 2. The neutralization reactor 3 is equipped with a pH detector 26 for real-time detection and adjustment of the pH value within the neutralization reactor 3. The neutralization reactor 3 is connected to the alkali high-level tank 2, which controls the amount of alkali solution. By adding alkali solution, the pH value is adjusted to 11, neutralizing the N,N-dimethylaniline salt in the material to generate trisodium phosphate, sodium chloride, and N,N-dimethylaniline. Neutralization vessel 3 is connected to acid booster pump 8 via a pipeline. Acid booster pump 8 delivers acid to neutralization vessel 3. The vent at the top of neutralization vessel 3 is connected to neutralization condenser 9. The outlet of neutralization condenser 9 is connected to neutralization vessel 3 via a pipeline. The outlet of neutralization vessel 3 is connected to layering tank 4. Layering tank 4 is used for static layering to separate water layer and N,N-dimethylaniline layer. Heating pipe 20 is installed in layering tank 4 to prevent solution solidification. The outlet of layering tank 4 is connected to wastewater recovery tank 10 via a pipeline. Wastewater recovery tank 10 is connected to wastewater triple-effect device 12 via wastewater booster pump 11. Wastewater recovery tank 10 receives wastewater from the bottom of layering tank 4 and recovers trisodium phosphate through wastewater triple-effect device 12. The top outlet of the layered tank 4 is connected to the aqueous aniline receiving tank 5 to receive N,N-dimethylaniline from the top of the layered tank 4. Both the distillation vessel 6 and the heating pipe 20 are equipped with steam inlet pipes 23 and steam outlet pipes 24, respectively, to raise the temperature with steam and accelerate the reaction. Both the neutralization vessel 3 and the distillation vessel 6 are equipped with stirring devices 25. The jackets of both the neutralization vessel 3 and the distillation vessel 6 are equipped with cooling water inlet pipes 21 and cooling water outlet pipes 22. The aqueous aniline receiving tank 5 is connected to the distillation vessel 6 via an aqueous aniline booster pump 13. The distillation vessel 6 distills and recovers N,N-dimethylaniline. The outlet of the distillation vessel 6 is connected to a first condenser 14 via a pipe, and the outlet of the first condenser 14 is connected to a second condenser 15 via a pipe. The outlets of condenser 14 and second condenser 15 are connected to distilled water receiving tank 16 via pipes. The outlet of distilled water receiving tank 16 is connected to water circulation pipe 17. Distilled water in distilled water receiving tank 16 is transported to the plant irrigation area for reuse through water circulation pipe 17, saving water resources. The discharge port at the bottom of distillation kettle 6 is connected to N,N-dimethylaniline receiving tank 7 via pipes. The recovered N,N-dimethylaniline enters N,N-dimethylaniline receiving tank 7 from the bottom of distillation kettle 6 through pipes. The bottom outlet of N,N-dimethylaniline receiving tank 7 is connected to chlorination kettle 19 via N,N-dimethylaniline booster pump 18. The recovered N,N-dimethylaniline is reused in chlorination kettle 19 for production.

[0025] As can be seen from the above technical solution, in the use of a highly efficient N,N-dimethylaniline catalyst recovery system, the aqueous phase material containing N,N-dimethylaniline salt is sent from the hydrolysis reactor 1 to the neutralization reactor via the alkaline high-level tank 2. Liquid alkali from the alkaline high-level tank 2 and acid from the acid booster pump 8 are added to the neutralization reactor 3 to adjust the pH to 11, resulting in a neutralization reaction that produces trisodium phosphate, sodium chloride, and N,N-dimethylaniline. After the neutralization reaction is completed in the neutralization reactor 3, the stirring device 25 stops stirring, and the mixture is allowed to stand and separate into layers for 30 minutes. The aqueous layer carries a small amount of aniline into the separation tank. 4. Static separation: Wastewater at the bottom of the stratified tank 4 enters the wastewater recovery tank 10, where trisodium phosphate is recovered through the wastewater triple-effect device 12. N,N-dimethylaniline at the top of the stratified tank 4 enters the aqueous aniline receiving tank 5, and is then pumped into the distillation kettle 6 for distillation recovery. The recovered N,N-dimethylaniline enters the N,N-dimethylaniline receiving tank 7 from the bottom of the distillation kettle 6 through a pipeline. The N,N-dimethylaniline catalyst in the N,N-dimethylaniline receiving tank 7 is then pumped into the chlorination kettle 19 for reuse, thereby reducing production costs.

[0026] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0027] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A highly efficient N,N-dimethylaniline catalyst recovery system, characterized in that: The system includes a hydrolysis reactor (1), an alkali high-level tank (2), a neutralization reactor (3), a layering tank (4), an aqueous aniline receiving tank (5), a distillation reactor (6), and an N,N-dimethylaniline receiving tank (7). The hydrolysis reactor (1) is connected to the neutralization reactor (3) through the alkali high-level tank (2). The neutralization reactor (3) is connected to an acid booster pump (8) through a pipeline. The gas outlet at the top of the neutralization reactor (3) is connected to a neutralization condenser (9). The liquid outlet of the neutralization condenser (9) is connected to the neutralization reactor (3) through a pipeline. The discharge of the neutralization reactor (3) is... The outlet is connected to the layered tank (4), which is equipped with a heating tube (20). The top outlet of the layered tank (4) is connected to the aqueous aniline receiving tank (5). The aqueous aniline receiving tank (5) is connected to the distillation kettle (6) via an aqueous aniline booster pump (13). The bottom outlet of the distillation kettle (6) is connected to the N,N-dimethylaniline receiving tank (7) via a pipe. The bottom outlet of the N,N-dimethylaniline receiving tank (7) is connected to the chlorination kettle (19) via an N,N-dimethylaniline booster pump (18).

2. The efficient N,N-dimethylaniline catalyst recovery system according to claim 1, characterized in that: The neutralization vessel (3) is equipped with a pH detector (26).

3. The efficient N,N-dimethylaniline catalyst recovery system according to claim 1, characterized in that: The outlet of the stratified tank (4) is connected to the sewage recovery tank (10) via a pipe.

4. The efficient N,N-dimethylaniline catalyst recovery system according to claim 3, characterized in that: The wastewater recovery tank (10) is connected to the wastewater triple-effect device (12) via a wastewater lift pump (11).

5. The efficient N,N-dimethylaniline catalyst recovery system according to claim 1, characterized in that: Both the distillation vessel (6) and the heating tube (20) are equipped with a steam inlet pipe (23) and a steam outlet pipe (24).

6. The efficient N,N-dimethylaniline catalyst recovery system according to claim 1, characterized in that: Both the neutralization vessel (3) and the distillation vessel (6) are equipped with stirring devices (25).

7. The efficient N,N-dimethylaniline catalyst recovery system according to claim 6, characterized in that: The jackets of the neutralization vessel (3) and the distillation vessel (6) are each equipped with an inlet cooling water pipe (21) and an outlet cooling water pipe (22).

8. The efficient N,N-dimethylaniline catalyst recovery system according to claim 1, characterized in that: The outlet of the distillation vessel (6) is connected to a first condenser (14) via a pipe. The outlet of the first condenser (14) is connected to a second condenser (15) via a pipe. The outlets of the first condenser (14) and the second condenser (15) are connected to a distilled water receiving tank (16) via pipes.

9. The efficient N,N-dimethylaniline catalyst recovery system according to claim 8, characterized in that: The outlet of the distilled water receiving tank (16) is connected to a water circulation pipe (17).

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