Device for recovering solvent in closed-loop liquid in production of 2-ethyl anthraquinone

Abstract

The utility model discloses a solvent recovery device in closed-loop liquid in 2-ethyl anthraquinone production, and relates to the technical field of 2-ethyl anthraquinone production, an outlet of a closed-loop liquid temporary storage tank is communicated with a molecular sieve filter through a closed-loop liquid transfer pump, and an outlet of the molecular sieve filter is communicated with a standing layering tank through a filtrate transfer pump; an inlet of the standing layering tank is communicated with an ethanol tank through a pipeline, and an outlet of the standing layering tank is communicated with a solvent recovery tank through a pipeline. The closed-loop liquid contains water and part of chlorobenzene, the chlorobenzene is located at the lower layer and the ethanol-water solution is located at the upper layer after the water is extracted, stood and layered under the action of the ethanol, and the chlorobenzene at the lower layer is discharged into the solvent recovery tank, so that the recovery of the chlorobenzene is realized, the pollution to the environment caused by direct discharge is avoided, the recovered chlorobenzene can be recycled, and the cost is reduced. The waste of raw materials is avoided, and the production cost is reduced. In addition, the molecular sieve filter can be repeatedly used after water in the molecular sieve filter is evaporated, so that the use cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of 2-ethylanthraquinone production, in particular to a solvent recovery device in a closed-loop liquid for 2-ethylanthraquinone production. Background Art

[0002] 2-Ethylanthraquinone is a light yellow flaky crystal, soluble in organic solvents, with a melting point of 107-111°C. It is mainly used in the manufacture of hydrogen peroxide, dye intermediates, photocurable resin catalysts, photodegradable films, coatings and photosensitive polymerization initiators.

[0003] At present, 2-ethylanthraquinone is prepared by using ethylbenzene and phthalic anhydride as raw materials, chlorobenzene as solvent, and aluminum chloride as catalyst for acylation, hydrolysis, desolvation and then closed-loop production. Since the closed-loop liquid contains water and some solvents, direct discharge will pollute the environment, and also cause waste of raw materials and increase production costs. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a solvent recovery device in closed-loop liquid for producing 2-ethylanthraquinone is provided to recover the solvent, thereby greatly reducing the waste of raw materials and avoiding the pollution to the environment caused by direct discharge.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A solvent recovery device for closed-loop liquid in the production of 2-ethylanthraquinone comprises a closed-loop liquid temporary storage tank, the outlet of the closed-loop liquid temporary storage tank is connected to a molecular sieve filter via a closed-loop liquid material transfer pump, the outlet of the molecular sieve filter is connected to a static stratification tank via a filtrate material transfer pump, the inlet of the static stratification tank is connected to an ethanol tank via a pipeline, and the outlet of the static stratification tank is connected to a solvent recovery tank via a pipeline.

[0007] As an improved technical solution, two of the molecular sieve filter and two of the static stratification tank are arranged in parallel.

[0008] As an improved technical solution, the outlet of the static stratification tank is connected to a distillation tank through a pipeline, the upper outlet of the distillation tank is connected to an ethanol recovery tank through a pipeline, and the lower outlet of the distillation tank is connected to a process water recovery tank through a pipeline.

[0009] As an improved technical solution, the ethanol recovery tank is connected to the ethanol tank through a pipeline.

[0010] As an improved technical solution, a density sensor is provided at the outlet of the static stratification tank, a first cut-off valve is provided between the static stratification tank and the solvent recovery tank, a second cut-off valve is provided between the static stratification tank and the distillation tank, and the density sensor, the first cut-off valve and the second cut-off valve are interlocked to a control system.

[0011] As an improved technical solution, the inlet pipe of the molecular sieve filter is provided with a nozzle.

[0012] As a preferred technical solution, a filter net is provided at the bottom of the molecular sieve filter, a first partition plate and a second partition plate are provided on the upper part of the filter net, a first opening is provided between the first partition plate and the inner wall of the molecular sieve filter, a second opening is provided between the second partition plate and the inner wall of the molecular sieve filter, and the first opening and the second opening are staggered.

[0013] As a preferred technical solution, the outlet of the molecular sieve filter is connected to the inlet of the closed-loop liquid-to-material pump through a pipeline.

[0014] As a preferred technical solution, the outlet of the filtrate transfer pump is connected to the inlet of the molecular sieve filter through a pipeline.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model discloses a solvent recovery device for closed-loop liquid in a 2-ethylanthraquinone production process, comprising a closed-loop liquid temporary storage tank, the outlet of the closed-loop liquid temporary storage tank is connected to a molecular sieve filter through a closed-loop liquid transfer pump, the outlet of the molecular sieve filter is connected to a static stratification tank through a filtrate transfer pump, the inlet of the static stratification tank is connected to an ethanol tank through a pipeline, and the outlet of the static stratification tank is connected to a solvent recovery tank through a pipeline. The closed-loop liquid contains water and part of chlorobenzene, which first enters the molecular sieve filter to absorb most of the water, and then the absorption liquid enters the static stratification tank, and under the action of ethanol, the remaining water in the absorption liquid is extracted, and after static stratification, chlorobenzene is in the lower layer, and the ethanol-water solution is in the upper layer, and the chlorobenzene in the lower layer is discharged into the solvent recovery tank, so that the recovery of chlorobenzene is achieved, and the pollution caused by direct discharge to the environment is avoided, and the recovered chlorobenzene can be reused at the same time, which avoids the waste of raw materials and reduces the production cost. In addition, the molecular sieve filter can be reused repeatedly after the water therein is evaporated by adding, and the use cost is low.

[0017] The utility model provides two molecular sieve filters and two static stratification tanks in parallel. By switching between different molecular sieve filters and static stratification tanks, the continuity of the solvent recovery process is ensured, the processing cycle is shortened, and the solvent recovery efficiency is improved.

[0018] The outlet of the static stratification tank is connected to a distillation tank through a pipeline, the upper outlet of the distillation tank is connected to an ethanol recovery tank through a pipeline, and the lower outlet of the distillation tank is connected to a process water recovery tank through a pipeline. The ethanol-water solution is heated by the distillation tank, and the ethanol with a low boiling point overflows from the upper part of the distillation tank and is collected by the ethanol recovery tank, and the water is collected by the process water recovery tank, which is connected to the ethanol tank through a pipeline. The ethanol in the ethanol recovery tank can be reused for water extraction, reducing production costs, and the water in the process water recovery tank can be used for the preparation of hydrochloric acid solution in the hydrolysis process, saving costs.

[0019] A density sensor is provided at the outlet of the static stratification tank, a first cut-off valve is provided between the static stratification tank and the solvent recovery tank, a second cut-off valve is provided between the static stratification tank and the distillation tank, and the density sensor, the first cut-off valve and the second cut-off valve are interlocked to a control system. The control system adjusts and switches the first cut-off valve and the second cut-off valve according to the value of the density sensor to prevent ethanol and water from entering the solvent recovery tank.

[0020] The inlet pipe of the molecular sieve filter is provided with a nozzle, so that the closed-loop liquid can enter the molecular sieve filter more evenly, and the adsorption effect on water is better.

[0021] The molecular sieve filter has a filter screen at the bottom, a first partition and a second partition are provided on the top of the filter screen, a first opening is provided between the first partition and the inner wall of the molecular sieve filter, a second opening is provided between the second partition and the inner wall of the molecular sieve filter, and the first opening and the second opening are arranged alternately. After the closed-loop liquid enters the molecular sieve filter, it flows in a zigzag line, which increases the time the closed-loop liquid stays in the molecular sieve filter and the flow path, and has a better absorption effect on water in the closed-loop liquid.

[0022] The outlet of the molecular sieve filter is connected to the inlet of the closed-loop liquid transfer pump through a pipeline. The closed-loop liquid can repeatedly enter the molecular sieve filter for adsorption, which has a better absorption effect on water and reduces the water content in the subsequent solvent.

[0023] The outlet of the filtrate transfer pump is connected to the inlet of the molecular sieve filter through a pipeline. By repeatedly allowing the filtrate to enter the molecular sieve filter for adsorption, the absorption effect of water is better, and the water content in the subsequent solvent is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Wherein: 1. Closed-loop liquid temporary storage tank; 2. Closed-loop liquid transfer pump; 3. Molecular sieve filter; 4. Filtrate transfer pump; 5. Standing stratification tank; 6. Ethanol tank; 7. Solvent recovery tank; 8. Distillation tank; 9. Ethanol recovery tank; 10. Process water recovery tank; 11. Density sensor; 12. First shut-off valve; 13. Second shut-off valve; 14. Nozzle; 15. Filter; 16. First partition; 17. Second partition; 18. First opening; 19. Second opening. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1 As shown, a solvent recovery device in a closed-loop liquid for producing 2-ethylanthraquinone comprises a closed-loop liquid temporary storage tank 1, the outlet of the closed-loop liquid temporary storage tank 1 is connected to a molecular sieve filter 3 through a closed-loop liquid transfer pump 2, the outlet of the molecular sieve filter 3 is connected to a static stratification tank 5 through a filtrate transfer pump 4, the inlet of the static stratification tank 5 is connected to an ethanol tank 6 through a pipeline, and the outlet of the static stratification tank 5 is connected to a solvent recovery tank 7 through a pipeline. The closed-loop liquid contains water and part of chlorobenzene, which first enters the molecular sieve filter 3 to absorb most of the water, and then the absorption liquid enters the static stratification tank 5. Under the action of ethanol, the remaining water in the absorption liquid is extracted. After static stratification, chlorobenzene is in the lower layer and the ethanol-water solution is in the upper layer. By discharging the chlorobenzene in the lower layer into the solvent recovery tank 7, the recovery of chlorobenzene is achieved, and the pollution caused by direct discharge to the environment is avoided. At the same time, the recovered chlorobenzene can be reused, which avoids the waste of raw materials and reduces the production cost. In addition, the molecular sieve filter 3 can be reused repeatedly after the water therein is evaporated by adding, and the use cost is low.

[0029] Two molecular sieve filters 3 and two static stratification tanks 5 are arranged in parallel. By switching different molecular sieve filters 3 and static stratification tanks 5, the continuity of the solvent recovery process is ensured, the processing cycle is shortened, and the solvent recovery efficiency is improved.

[0030] The outlet of the static stratification tank 5 is connected to a distillation tank 8 through a pipeline, the upper outlet of the distillation tank 8 is connected to an ethanol recovery tank 9 through a pipeline, and the lower outlet of the distillation tank 8 is connected to a process water recovery tank 10 through a pipeline. The ethanol-water solution is heated by the distillation tank 8, and the ethanol with a low boiling point overflows from the upper part of the distillation tank 8 and is collected by the ethanol recovery tank 9, and the water is collected by the process water recovery tank 10. The ethanol recovery tank 9 is connected to the ethanol tank 6 through a pipeline, and the ethanol in the ethanol recovery tank 9 can be reused for water extraction, reducing the production cost, and the water in the process water recovery tank 10 can be used for the preparation of the hydrochloric acid solution in the hydrolysis process, saving the cost.

[0031] A density sensor 11 is provided at the outlet of the static stratification tank 5, a first cut-off valve 12 is provided between the static stratification tank 5 and the solvent recovery tank 7, a second cut-off valve 13 is provided between the static stratification tank 5 and the distillation tank 8, and the density sensor 11, the first cut-off valve 12 and the second cut-off valve 13 are interlocked to a control system. The control system adjusts and switches the first cut-off valve 12 and the second cut-off valve 13 according to the value of the density sensor 11 to prevent ethanol and water from entering the solvent recovery tank 7.

[0032] The inlet pipe of the molecular sieve filter 3 is provided with a nozzle 14, so that the closed-loop liquid can enter the molecular sieve filter 3 more evenly, and the adsorption effect on water is better.

[0033] A filter screen 15 is provided at the bottom of the molecular sieve filter 3, a first partition plate 16 and a second partition plate 17 are provided on the upper part of the filter screen 15, a first opening 18 is provided between the first partition plate 16 and the inner wall of the molecular sieve filter 3, a second opening 19 is provided between the second partition plate 17 and the inner wall of the molecular sieve filter 3, and the first opening 18 and the second opening 19 are arranged alternately. After the closed-loop liquid enters the molecular sieve filter 3, it flows in a zigzag manner, which increases the time the closed-loop liquid stays in the molecular sieve filter 3 and the flow path, and has a better absorption effect on water in the closed-loop liquid.

[0034] The outlet of the molecular sieve filter 3 is connected to the inlet of the closed-loop liquid transfer pump 2 through a pipeline. The closed-loop liquid can be repeatedly introduced into the molecular sieve filter 3 for adsorption, which has a better absorption effect on water and reduces the water content in the subsequent solvent.

[0035] The outlet of the filtrate transfer pump 4 is connected to the inlet of the molecular sieve filter 3 through a pipeline. By repeatedly allowing the filtrate to enter the molecular sieve filter 3 for adsorption, the absorption effect of water is better, and the water content in the subsequent solvent is reduced.

[0036] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A solvent recovery device for closed-loop liquid production of 2-ethylanthraquinone, characterized in that: It comprises a closed-loop liquid temporary storage tank, the outlet of which is connected to a molecular sieve filter via a closed-loop liquid transfer pump, the outlet of which is connected to a static stratification tank via a filtrate transfer pump, the inlet of which is connected to an ethanol tank via a pipeline, and the outlet of which is connected to a solvent recovery tank via a pipeline.

2. A solvent recovery device for closed-loop liquid in the production of 2-ethylanthraquinone as claimed in claim 1, characterized in that: The molecular sieve filter and the static stratification tank are both provided in two parallel configurations.

3. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 1, characterized in that: The outlet of the static stratification tank is connected to a distillation tank through a pipeline, the upper outlet of the distillation tank is connected to an ethanol recovery tank through a pipeline, and the lower outlet of the distillation tank is connected to a process water recovery tank through a pipeline.

4. A solvent recovery device for closed-loop liquid in the production of 2-ethylanthraquinone as claimed in claim 3, characterized in that: The ethanol recovery tank is connected to the ethanol tank through a pipeline.

5. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 3, characterized in that: A density sensor is provided at the outlet of the static stratification tank, a first cut-off valve is provided between the static stratification tank and the solvent recovery tank, a second cut-off valve is provided between the static stratification tank and the distillation tank, and the density sensor, the first cut-off valve and the second cut-off valve are interlocked to a control system.

6. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 1, characterized in that: The inlet pipe of the molecular sieve filter is provided with a nozzle.

7. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 1, characterized in that: A filter net is provided at the bottom of the molecular sieve filter, a first partition plate and a second partition plate are provided at the top of the filter net, a first opening is provided between the first partition plate and the inner wall of the molecular sieve filter, a second opening is provided between the second partition plate and the inner wall of the molecular sieve filter, and the first opening and the second opening are arranged alternately.

8. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 1, characterized in that: The outlet of the molecular sieve filter is connected to the inlet of the closed-loop liquid-to-material pump through a pipeline.

9. The solvent recovery device in the closed-loop liquid for producing 2-ethylanthraquinone according to claim 1, characterized in that: The outlet of the filtrate transfer pump is connected to the inlet of the molecular sieve filter through a pipeline.

Images