Stripping separation device for p-benzoquinone compound

Abstract

The utility model belongs to the technical field of material separation, and particularly relates to a stripping separation device for p-benzoquinone compounds, which comprises a stripping tower, a primary condensation assembly, a secondary condensation assembly, a vacuum buffer tank, a gas-liquid separation assembly and a tail gas absorption tower, the first-stage condensation assembly is connected with the second-stage condensation assembly through a first-stage condensation gas outlet pipeline, the second-stage condensation assembly is connected with the vacuum buffer tank through a second-stage condensation gas outlet pipeline, and the vacuum buffer tank is connected with the gas-liquid separation assembly through a vacuum gas outlet pipeline. The gas-liquid separation assembly is connected with the tail gas absorption tower through a gas-liquid separation gas outlet pipeline. According to the utility model, the problem of carbonization of p-benzoquinone compounds due to overhigh temperature can be solved by reducing the distillation temperature of the tower top.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of p-benzoquinone compound's stripping separation device, belong to material separation technical field. BACKGROUND

[0002] P-benzoquinone compound is an important chemical raw material, widely used in dyes, polymer materials, organic synthesis, fine chemical, pesticide, medicine and other fields.P-benzoquinone compound is mainly used for manufacturing p-benzenediol compound and dye intermediate, rubber antioxidant, acrylonitrile and vinyl acetate polymerization initiator and chlorinating agent, etc., also used as styrene, vinyl acetate, methyl methacrylate, unsaturated polyester resin etc monomer's polymerization inhibitor, also is acrylonitrile and Z acid vinyl polymerization initiator, in addition, also used as natural rubber, synthetic rubber, food and other organic matter's antioxidant.

[0003] P-benzoquinone, also known as 1,4-benzoquinone, 1,4-benzoquinone, is an organic compound, chemical formula is C6H4O2.P-benzoquinone melting point is 113-115 ℃, boiling point is 174 ℃, density is 1.32 g / cm 3 , flash point is 59.3 ℃, slightly soluble in water, soluble in hot water, ethanol, diethyl ether, lye etc.P-benzoquinone in 3 carcinogenic list, may have carcinogenicity.

[0004] Because the solubility of p-benzoquinone compound in cold water is low, the solubility in hot water is higher, so water vapor stripping method is often used for the separation and purification of p-benzoquinone compound.For example: in aniline oxidation method, aniline is oxidized to p-benzoquinone by high-valence metal salt in sulfuric acid medium, after the mother liquor of reaction is stripped by water vapor in reverse, p-benzoquinone product can be separated by cooling, crystallization and other steps.But the energy consumption of this stripping process is too high, in addition, because p-benzoquinone is relatively active in chemical properties, carbonization and coking phenomenon is easy to occur in stripping tower, not only reduces the yield of p-benzoquinone compound, but also affects the product quality.

[0005] At present, there are many shortcomings in the production process of p-benzoquinone compound, how to save energy in the separation process of p-benzoquinone compound and effectively deal with the problem of carbonization and coking is the urgent technical problem to be solved by the skilled in the art. SUMMARY

[0006] The utility model provides a kind of p-benzoquinone compound's stripping separation device for the above technical problems of prior art, avoid the carbonization and coking of p-benzoquinone compound in stripping tower, while being equipped with falling film condensation absorption and tail gas absorption tower system, the content of p-benzoquinone compound in waste gas is controlled to the maximum extent, and the content of harmful substances in tail gas is reduced.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A stripping separation device for p-benzoquinone compounds includes a stripping tower, a primary condenser assembly, a secondary condenser assembly, a vacuum buffer tank, a gas-liquid separation assembly, and a tail gas absorption tower. The steam inlet of the stripping tower is connected to a steam input pipe, the feed inlet of the stripping tower is connected to a stripping feed pipe, the discharge outlet of the stripping tower is connected to a wastewater discharge pipe, a hot water stripping pipe is connected to the top of the stripping tower, the gas outlet of the stripping tower is connected to the primary condenser assembly through a stripping gas outlet pipe, the primary condenser assembly is connected to the secondary condenser assembly through a primary condenser gas outlet pipe, and the secondary condenser assembly discharges gas through a secondary condenser gas outlet pipe. The pipeline is connected to the vacuum buffer tank, which is connected to the gas-liquid separation assembly via a vacuum outlet pipe. The gas-liquid separation assembly is connected to the tail gas absorption tower via a gas-liquid separation outlet pipe. The gas-liquid separation assembly includes a gas-liquid separation tank and a falling film cooler. The falling film cooler is located above the gas-liquid separation tank. The inlet of the gas-liquid separation tank is connected to the vacuum outlet pipe, the gas outlet of the gas-liquid separation tank is connected to the gas-liquid separation outlet pipe, the liquid outlet of the gas-liquid separation tank is connected to the gas-liquid separation circulation pipe, the gas-liquid separation circulation pipe is connected to the liquid inlet of the falling film cooler, and the liquid outlet of the falling film cooler is connected to the gas-liquid separation tank.

[0008] The beneficial effects of this utility model are as follows: By setting up a stripping tower, a vacuum buffer tank, and a gas-liquid separation component, this utility model achieves continuous negative pressure operation, thereby reducing the distillation temperature at the top of the tower and solving the problem of carbonization of p-benzoquinone compounds due to excessively high temperature. By using low-pressure steam for direct heating and setting up a two-stage condensation component at the top of the tower, the p-benzoquinone compound product crystallizes and precipitates out. The tail gas enters the liquid ring vacuum circulation device, which maximizes the capture of condensable components in the gas phase.

[0009] Furthermore, the primary condensation assembly includes a primary condenser and a primary condensate receiving tank. The primary condenser is located at the opening of the primary condensate receiving tank, and the outlet of the primary condenser is connected to the opening of the primary condensate receiving tank. The outlet of the primary condensate receiving tank is connected to a primary condensation circulation pipe. A primary hot water pipe is connected to the top of the primary condensate receiving tank. The top of the primary condenser is provided with a first liquid inlet and a second liquid inlet. The first liquid inlet of the primary condenser is connected to the steam stripping gas pipe, and the second liquid inlet of the primary condenser is connected to the primary condensation circulation pipe. The primary condensation circulation pipe is connected to the primary product receiving tank through a primary product discharge pipe, and a primary condensate feeding pump is provided on the primary condensation circulation pipe.

[0010] The beneficial effects of adopting the above-mentioned further technical solution are: the benzoquinone product is condensed through a primary condenser and a primary condensate receiving tank, and the temperature of the condensate is controlled by controlling the circulating water flow to prevent the temperature from being too low, thus preventing the benzoquinone compound product from crystallizing and precipitating, which is then received through a primary product discharge pipe and a primary product receiving tank.

[0011] Furthermore, the secondary condensation assembly includes a secondary condenser and a secondary condensate receiving tank. The secondary condenser is located at the opening of the secondary condensate receiving tank, and the outlet of the secondary condenser is connected to the opening of the secondary condensate receiving tank. The outlet of the secondary condensate receiving tank is connected to a secondary condensation circulation pipeline. A secondary hot water pipeline is connected to the top of the secondary condensate receiving tank. The top of the secondary condenser is provided with a first liquid inlet and a second liquid inlet. The first liquid inlet of the secondary condenser is connected to the primary condensate outlet pipeline, and the second liquid inlet of the secondary condenser is connected to the secondary condensation circulation pipeline. The secondary condensation circulation pipeline is connected to the secondary product receiving tank through a secondary product outlet pipeline, and a secondary condensate feeding pump is provided on the secondary condensation circulation pipeline.

[0012] The beneficial effects of adopting the above-mentioned further technical solution are: the p-benzoquinone product in the gas is further condensed by the secondary condenser and the secondary condensate receiving tank, and the temperature of the condensate is controlled by controlling the circulating water flow to prevent the temperature from being too low and causing the p-benzoquinone compound product to crystallize and precipitate, which is then received through the secondary product discharge pipe and the secondary product receiving tank.

[0013] Furthermore, the top of the vacuum buffer tank is connected to a vacuum hot water pipe, the gas inlet of the vacuum buffer tank is connected to the secondary condensate outlet pipe, the gas outlet of the vacuum buffer tank is connected to the vacuum outlet pipe, and a vacuum pump is installed on the vacuum outlet pipe.

[0014] Furthermore, a falling film circulation pump is provided on the gas-liquid separation circulation pipeline, and the gas-liquid separation circulation pipeline is connected to a primary saturated liquid receiving container through a primary saturated liquid output pipeline.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that the uncondensed tail gas containing trace amounts of p-benzoquinone compounds enters the gas-liquid separator and falling film cooler for further condensation and separation.

[0016] Furthermore, the gas inlet of the tail gas absorption tower is connected to the gas-liquid separation outlet pipe, the tail gas outlet of the tail gas absorption tower is connected to the tail gas outlet pipe, a fan is installed on the tail gas outlet pipe, the liquid outlet of the tail gas absorption tower is connected to the absorption tower circulation pipe, the tail gas absorption tower is provided with multiple circulating liquid inlets, the absorption tower circulation pipe is connected to the circulating liquid inlets of the tail gas absorption tower, and an absorption tower transfer pump is installed on the absorption tower circulation pipe.

[0017] Furthermore, the absorption tower circulation pipeline is connected to a circulation cooler, the inlet of the circulation cooler is connected to the absorption tower circulation pipeline, the outlet of the circulation cooler is connected to a circulation liquid pipeline, and the circulation liquid pipeline is connected to the circulation liquid inlet of the tail gas absorption tower.

[0018] Furthermore, the absorption tower circulation pipeline is connected to the secondary saturated liquid receiving container through the secondary saturated liquid output pipeline.

[0019] Furthermore, the primary condenser, secondary condenser, falling film cooler, and circulating cooler are all vertically arranged. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] The attached diagrams are labeled as follows: 1. Stripping tower; 2. Primary condenser; 3. Primary condensate receiving tank; 4. Secondary condenser; 5. Secondary condensate receiving tank; 6. Vacuum buffer tank; 7. Gas-liquid separator; 8. Falling film cooler; 9. Tail gas absorption tower; 10. Circulating cooler; 11. Primary condensate feed pump; 12. Secondary condensate feed pump; 13. Vacuum pump; 14. Falling film circulating pump; 15. Absorber transfer pump; 16. Fan; 17. Stripping hot water pipeline; 18. Stripping feed pipeline; 19. Wastewater discharge pipeline; 20. Stripping gas pipeline; 21. Primary condensate circulating pipeline; 22. Primary product receiving tank; 23. Primary product outlet... 24. Primary condensate outlet pipeline; 25. Secondary condensate circulation pipeline; 26. Secondary condensate outlet pipeline; 27. Vacuum hot water pipeline; 28. Vacuum outlet pipeline; 29. ​​Gas-liquid separation circulation pipeline; 31. Gas-liquid separation outlet pipeline; 32. Absorption tower circulation pipeline; 33. Circulating liquid pipeline; 34. Tail gas outlet pipeline; 35. Secondary product receiving tank; 36. Primary saturated liquid output pipeline; 37. Primary saturated liquid receiving container; 38. Secondary product discharge pipeline; 39. Secondary saturated liquid output pipeline; 40. Secondary saturated liquid receiving container; 41. Steam input pipeline; 42. Primary hot water pipeline; 43. Secondary hot water pipeline. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] See Figure 1A stripping and separation device for p-benzoquinone compounds includes a stripping tower 1, a primary condenser assembly, a secondary condenser assembly, a vacuum buffer tank 6, a gas-liquid separation assembly, and a tail gas absorption tower 9. The stripping tower 1 has a discharge port at its bottom, a gas outlet at its top, a feed inlet at its upper part, and a steam inlet at its lower part. The steam inlet of the stripping tower 1 is connected to a steam input pipe 41. The feed inlet of the stripping tower 1 is connected to a stripping feed pipe 18. The discharge port of the stripping tower 1 is connected to a wastewater output pipe 19. A stripping hot water pipe 17 is connected to the top of the stripping tower 1. The gas outlet of the stripping tower 1 is connected to the primary condenser assembly via a stripping gas outlet pipe 20. The primary condenser assembly is connected to the secondary condenser assembly via a primary condenser outlet pipe 24. The secondary condenser assembly is connected to the secondary... The condensate outlet pipe 26 is connected to the vacuum buffer tank 6. The vacuum buffer tank 6 is connected to the gas-liquid separation component through the vacuum outlet pipe 28. The gas-liquid separation component is connected to the tail gas absorption tower 9 through the gas-liquid separation outlet pipe 31. The gas-liquid separation component includes a gas-liquid separation tank 7 and a falling film cooler 8. The falling film cooler 8 is located above the gas-liquid separation tank 7. The upper part of the gas-liquid separation tank 7 is provided with a feed inlet and a gas outlet. The bottom of the gas-liquid separation tank 7 is provided with a liquid outlet. The feed inlet of the gas-liquid separation tank 7 is connected to the vacuum outlet pipe 28. The gas outlet of the gas-liquid separation tank 7 is connected to the gas-liquid separation outlet pipe 31. The liquid outlet of the gas-liquid separation tank 7 is connected to the gas-liquid separation circulation pipe 29. The gas-liquid separation circulation pipe 29 is connected to the liquid inlet of the falling film cooler 8. The liquid outlet of the falling film cooler 8 is connected to the gas-liquid separation tank 7.

[0024] The primary condensation assembly includes a primary condenser 2 and a primary condensate receiving tank 3. The primary condensate receiving tank 3 has an opening at the top and an outlet at the bottom. The primary condenser 2 is located at the opening of the primary condensate receiving tank 3, and its outlet is connected to the opening of the primary condensate receiving tank 3. The outlet of the primary condensate receiving tank 3 is connected to a primary condensation circulation pipe 21. A primary hot water pipe 42 is connected to the top of the primary condensate receiving tank 3. The top of the primary condenser 2 has a first inlet and a second inlet. The first inlet of the primary condenser 2 is connected to a steam stripping pipe 20, and the second inlet of the primary condenser 2 is connected to the primary condensation circulation pipe 21. The primary condensation circulation pipe 21 is connected to a primary product receiving tank 22 via a primary product discharge pipe 23. A primary condensate feeding pump 11 is installed on the primary condensation circulation pipe 21.

[0025] The secondary condensation assembly includes a secondary condenser 4 and a secondary condensate receiving tank 5. The secondary condensate receiving tank 5 has an opening at the top and an outlet at the bottom. The secondary condenser 4 is located at the opening of the secondary condensate receiving tank 5, and its outlet is connected to the opening of the secondary condensate receiving tank 5. The outlet of the secondary condensate receiving tank 5 is connected to the secondary condensation circulation pipe 25. The top of the secondary condensate receiving tank 5 is connected to a secondary hot water pipe 43. The top of the secondary condenser 4 has a first inlet and a second inlet. The first inlet of the secondary condenser 4 is connected to the primary condensate outlet pipe 24, and the second inlet of the secondary condenser 4 is connected to the secondary condensation circulation pipe 25. The secondary condensation circulation pipe 25 is connected to the secondary product receiving tank 35 through a secondary product outlet pipe 38. A secondary condensate feeding pump 12 is installed on the secondary condensation circulation pipe 25.

[0026] The top of the vacuum buffer tank 6 is provided with a gas inlet and a gas outlet. The top of the vacuum buffer tank 6 is connected to a vacuum hot water pipe 27. The gas inlet of the vacuum buffer tank 6 is connected to a secondary condenser outlet pipe 26. The gas outlet of the vacuum buffer tank 6 is connected to a vacuum outlet pipe 28. A vacuum pump 13 is provided on the vacuum outlet pipe 28.

[0027] A falling film circulation pump 14 is installed on the gas-liquid separation circulation pipeline 29, and the gas-liquid separation circulation pipeline 29 is connected to the primary saturated liquid receiving container 37 through the primary saturated liquid output pipeline 36.

[0028] The tail gas absorption tower 9 has a tail gas outlet at the top, a gas inlet in the middle, and a liquid outlet at the bottom. The gas inlet of the tail gas absorption tower 9 is connected to the gas-liquid separation outlet pipe 31, and the tail gas outlet of the tail gas absorption tower 9 is connected to the tail gas outlet pipe 34. A fan 16 is installed on the tail gas outlet pipe 34. The liquid outlet of the tail gas absorption tower 9 is connected to the absorption tower circulation pipe 32. The tail gas absorption tower 9 has multiple circulating liquid inlets. The absorption tower circulation pipe 32 is connected to the circulating liquid inlets of the tail gas absorption tower 9, and an absorption tower transfer pump 15 is installed on the absorption tower circulation pipe 32.

[0029] The absorption tower circulation pipe 32 is connected to the circulation cooler 10. The liquid inlet of the circulation cooler 10 is connected to the absorption tower circulation pipe 32. The liquid outlet of the circulation cooler 10 is connected to the circulation liquid pipe 33. The circulation liquid pipe 33 is connected to the circulation liquid inlet of the tail gas absorption tower 9.

[0030] The absorption tower circulation pipe 32 is connected to the secondary saturated liquid receiving container 40 through the secondary saturated liquid output pipe 39.

[0031] The primary condenser 2, the secondary condenser 4, the falling film cooler 8, and the circulating cooler 10 are all vertically installed.

[0032] The working process of this utility model is as follows:

[0033] The p-benzoquinone compound feedstock enters stripping tower 1 from the top via stripping feed pipe 18. Saturated low-pressure steam is introduced into the bottom of stripping tower 1 via steam input pipe 41. Vacuum pump 13 maintains the system vacuum at -0.08 MPaG. The temperature at the top of stripping tower 1 is 60℃, and the temperature at the bottom is 61℃. The vapor phase at the top of stripping tower 1 is condensed in primary condenser 2, using ambient temperature water as the cooling medium. It then passes through secondary condenser 4, using chilled water as the cooling medium. Primary condensate receiving tank 3 receives the condensate from primary condenser 2, and secondary condensate receiving tank 5 receives the condensate from secondary condenser 4. The condensed gas and liquid phases undergo gas-liquid separation in primary condensate receiving tank 3 and secondary condensate receiving tank 5. The liquid phase is circulated and discharged as qualified p-benzoquinone compound products through the primary condenser pump 11 and the secondary condenser pump 12; qualified wastewater is collected from the bottom of the stripping tower 1 and discharged through the wastewater output pipe 19; the uncondensed tail gas containing trace amounts of p-benzoquinone compound enters the gas-liquid separator 7, and the tail gas rises to the falling film cooler 8 for condensation and falls back to the gas-liquid separator 7. After condensation, the liquid phase is circulated and discharged through the falling film circulation pump 14. The circulating liquid goes through the gas-liquid separation circulation pipe 29 to the falling film cooler 8 for further cooling. The tail gas is captured to the maximum extent through continuous circulation and condensation. The uncondensed tail gas passes through the tail gas absorption tower 9 and the circulating cooler 10. The tail gas absorption tower 9 uses process water as the absorbent. The absorbent is circulated through the absorption tower transfer pump 15. When the absorbent is saturated, it is discharged. The purified qualified tail gas is discharged through the fan 16.

[0034] The distillation temperature of p-benzoquinone compounds is generally between 100℃ and 110℃. At this temperature, p-benzoquinone compounds are prone to carbonization and coking in the stripping tower, and solids will deposit on the tower plates, causing frequent tower blockage (mainly on the two top plates and the tower cap), requiring manual cleaning. The equipment of this invention can reduce the top distillation temperature by employing a micro-negative pressure distillation method, reducing or even avoiding the carbonization of p-benzoquinone compounds due to excessively high temperatures. Simultaneously, the condensation in this invention uses a vertical falling film condensation vacuum system, ensuring complete condensation of the evaporated gas phase in the condenser. Furthermore, this invention employs a falling film condensation absorption and tail gas absorption tower system to control the p-benzoquinone compound content in the waste gas to the greatest extent possible, solving the tail gas emission problem.

[0035] This invention addresses the challenges of anti-clogging requirements and temperature control by employing a micro-negative pressure distillation method. The system maintains a vacuum of approximately -0.08 MPaG, a top temperature of approximately 60°C, and a bottom temperature of approximately 61°C, effectively preventing the carbonization of benzoquinone compounds due to excessive temperature. To address the issue of benzoquinone compounds having a high melting point and being prone to crystallization and clogging within the equipment, this invention utilizes a vertical falling film condensation vacuum system. The vapor phase from the top of the column enters the falling film cooling absorber, where the water temperature is controlled for cooling and condensation, ensuring complete condensation of the evaporated vapor phase within the condenser. Simultaneously, a falling film condensation absorption and tail gas absorption tower system is included to reduce the amount of benzoquinone compounds carried by water evaporation to subsequent vacuum systems. Both the primary and secondary condensation components are equipped with a hot water spray system for periodic rinsing, reducing the risk of system clogging.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stripping and separation apparatus for p-benzoquinone compounds, characterized in that, The system includes a stripping tower (1), a primary condenser assembly, a secondary condenser assembly, a vacuum buffer tank (6), a gas-liquid separation assembly, and a tail gas absorption tower (9). The steam inlet of the stripping tower (1) is connected to a steam input pipe (41), the feed inlet of the stripping tower (1) is connected to a stripping feed pipe (18), the discharge outlet of the stripping tower (1) is connected to a wastewater discharge pipe (19), the top of the stripping tower (1) is connected to a stripping hot water pipe (17), the gas outlet of the stripping tower (1) is connected to the primary condenser assembly via a stripping gas outlet pipe (20), the primary condenser assembly is connected to the secondary condenser assembly via a primary condenser outlet pipe (24), the secondary condenser assembly is connected to the vacuum buffer tank (6) via a secondary condenser outlet pipe (26), and the vacuum buffer tank (6) is connected to the tail gas absorption tower (9). 6) The gas-liquid separation assembly is connected to the vacuum outlet pipe (28). The gas-liquid separation assembly is connected to the tail gas absorption tower (9) through the gas-liquid separation outlet pipe (31). The gas-liquid separation assembly includes a gas-liquid separation tank (7) and a falling film cooler (8). The falling film cooler (8) is located above the gas-liquid separation tank (7). The inlet of the gas-liquid separation tank (7) is connected to the vacuum outlet pipe (28). The gas outlet of the gas-liquid separation tank (7) is connected to the gas-liquid separation outlet pipe (31). The liquid outlet of the gas-liquid separation tank (7) is connected to the gas-liquid separation circulation pipe (29). The gas-liquid separation circulation pipe (29) is connected to the liquid inlet of the falling film cooler (8). The liquid outlet of the falling film cooler (8) is connected to the gas-liquid separation tank (7).

2. The stripping and separation apparatus for p-benzoquinone compounds according to claim 1, characterized in that, The primary condensation assembly includes a primary condenser (2) and a primary condensate receiving tank (3). The primary condenser (2) is located at the opening of the primary condensate receiving tank (3). The outlet of the primary condenser (2) is connected to the opening of the primary condensate receiving tank (3). The outlet of the primary condensate receiving tank (3) is connected to a primary condensation circulation pipe (21). A primary hot water pipe (42) is connected to the top of the primary condensate receiving tank (3). The top of the primary condenser (2) is provided with a first liquid inlet and a second liquid inlet. The first liquid inlet of the primary condenser (2) is connected to the steam extraction pipe (20). The second liquid inlet of the primary condenser (2) is connected to the primary condensation circulation pipe (21). The primary condensation circulation pipe (21) is connected to the primary product receiving tank (22) through a primary product discharge pipe (23). A primary condensate feeding pump (11) is provided on the primary condensation circulation pipe (21).

3. The stripping and separation apparatus for p-benzoquinone compounds according to claim 2, characterized in that, The secondary condensation assembly includes a secondary condenser (4) and a secondary condensate receiving tank (5). The secondary condenser (4) is located at the opening of the secondary condensate receiving tank (5). The outlet of the secondary condenser (4) is connected to the opening of the secondary condensate receiving tank (5). The outlet of the secondary condensate receiving tank (5) is connected to the secondary condensation circulation pipe (25). The top of the secondary condensate receiving tank (5) is connected to a secondary hot water pipe (43). The top of the secondary condenser (4) is provided with a first liquid inlet and a second liquid inlet. The first liquid inlet of the secondary condenser (4) is connected to the primary condensation outlet pipe (24). The second liquid inlet of the secondary condenser (4) is connected to the secondary condensation circulation pipe (25). The secondary condensation circulation pipe (25) is connected to the secondary product receiving tank (35) through a secondary product discharge pipe (38). The secondary condensation circulation pipe (25) is provided with a secondary condensate feeding pump (12).

4. The stripping and separation apparatus for p-benzoquinone compounds according to claim 3, characterized in that, The top of the vacuum buffer tank (6) is connected to a vacuum hot water pipe (27), the gas inlet of the vacuum buffer tank (6) is connected to the secondary condenser outlet pipe (26), the gas outlet of the vacuum buffer tank (6) is connected to the vacuum outlet pipe (28), and a vacuum pump (13) is provided on the vacuum outlet pipe (28).

5. The stripping and separation apparatus for p-benzoquinone compounds according to claim 4, characterized in that, The gas-liquid separation circulation pipeline (29) is equipped with a falling film circulation pump (14), and the gas-liquid separation circulation pipeline (29) is connected to the primary saturated liquid receiving container (37) through the primary saturated liquid output pipeline (36).

6. The stripping and separation apparatus for p-benzoquinone compounds according to claim 5, characterized in that, The gas inlet of the tail gas absorption tower (9) is connected to the gas-liquid separation outlet pipe (31), the tail gas outlet of the tail gas absorption tower (9) is connected to the tail gas outlet pipe (34), a fan (16) is provided on the tail gas outlet pipe (34), the liquid outlet of the tail gas absorption tower (9) is connected to the absorption tower circulation pipe (32), the tail gas absorption tower (9) is provided with multiple circulating liquid inlets, the absorption tower circulation pipe (32) is connected to the circulating liquid inlet of the tail gas absorption tower (9), and an absorption tower transfer pump (15) is provided on the absorption tower circulation pipe (32).

7. The stripping and separation apparatus for p-benzoquinone compounds according to claim 6, characterized in that, The absorption tower circulation pipe (32) is connected to a circulation cooler (10). The inlet of the circulation cooler (10) is connected to the absorption tower circulation pipe (32). The outlet of the circulation cooler (10) is connected to a circulation liquid pipe (33). The circulation liquid pipe (33) is connected to the circulation liquid inlet of the tail gas absorption tower (9).

8. The stripping and separation apparatus for p-benzoquinone compounds according to claim 7, characterized in that, The absorption tower circulation pipe (32) is connected to the secondary saturated liquid receiving container (40) through the secondary saturated liquid output pipe (39).

9. The stripping and separation apparatus for p-benzoquinone compounds according to claim 8, characterized in that, The primary condenser (2), secondary condenser (4), falling film cooler (8), and circulating cooler (10) are all vertically arranged.

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