Industrial treatment method for removing impurities from chlorobenzene kettle bottom solution

Abstract

The invention relates to the field of chemical production, in particular to an industrial treatment method for removing impurities from a chlorobenzene kettle bottom solution. The invention discloses an industrial treatment method for removing impurities from a chlorobenzene kettle bottom solution. The industrial treatment method comprises the following steps: S1, heating the chlorobenzene kettle bottom solution in a reaction kettle, and adding a material A for reaction; after the reaction is finished, adding deionized water for washing and standing for layering, and separating a water phase to obtain a mixture 1; s2, adding a material B into the mixture 1 to react, standing for layering after the reaction is ended, and separating a water phase to obtain a chlorobenzene extracting solution; s3, mixing and precipitating the chlorobenzene extracting solution and a complexing agent at the temperature T1, and filtering at the temperature T2; and S4, carrying out reduced pressure distillation on the filtered solid filter residue to obtain a chlorobenzene purified solution The obtained chlorobenzene is good in purity and high in recovery rate, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the field of chemical production, and in particular to an industrial treatment method for removing impurities from chlorobenzene kettle bottom liquid. Background Art

[0002] Galaxolide is the first synthetic musk developed by International Flavors & Fragrances (IFF) in the 1960s. It has a molecular weight of 258.4, a boiling point of 129°C (107 Pa), and a chemical name of 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-γ-2-benzopyran. It has a strong and lasting musk aroma, accompanied by a woody aroma, and is widely used in cosmetics, soap flavors and other industries.

[0003] At present, the main industrial route is to react α-methylstyrene and isopentene in the presence of phosphoric acid as a catalyst to generate pentamethylindane, and then the pentamethylindane and propylene oxide are subjected to Friedel-Crafts alkylation to obtain hexamethylindanol, which is then reacted with methylal to obtain the products galaxol and methanol. The reaction mechanism is as follows:

[0004]

[0005] In the actual industrial production of galaxol, 1 molecule of hexamethylindanol (GLA) and 1 molecule of methylal react under the catalysis of aluminum chloride / chlorobenzene solvent to generate 1 molecule of galaxol and 2 molecules of methanol. Then a large amount of water is added to the reaction solution to remove methanol and aluminum chloride. At the same time, aluminum chloride undergoes strong hydrolysis in water to release hydrogen chloride gas to form a hydrochloric acid solution. Propylene oxide undergoes a ring-opening reaction in hydrochloric acid to form 1-chloro-2-propanol and 2-chloro-1-propanol (collectively referred to as chloropropanol). The reaction mechanism is as follows:

[0006]

[0007] However, the boiling point of chloropropanol (128-133°C) is very close to that of chlorobenzene (131°C). In the subsequent intermittent distillation to recover chlorobenzene, a lot of chloropropanol will be entrained, which makes the recovery of chlorobenzene more difficult on the one hand; on the other hand, the purity of the recovered chlorobenzene is low, thus affecting the reuse of chlorobenzene as a solvent. Summary of the invention

[0008] In order to solve the above problems, the present invention provides an industrial treatment method for removing impurities from chlorobenzene bottom liquid. The method of the present invention is used to remove impurities from chlorobenzene bottom liquid, and the obtained chlorobenzene has good purity and high recovery rate.

[0009] The technical solution of the present invention is achieved in this way:

[0010] An industrial treatment method for removing impurities from chlorobenzene bottom liquid comprises the following steps:

[0011] S1: placing the chlorobenzene bottom liquid in a reactor, heating it and adding material A to react; after the reaction, adding deionized water for washing and standing to separate the layers, separating the aqueous phase to obtain a mixture 1;

[0012] S2: adding material B to the mixture 1 to react, standing and stratifying after the reaction, separating the aqueous phase to obtain a chlorobenzene extract;

[0013] S3: mixing the chlorobenzene extract with the complexing agent at temperature T1 to precipitate, and filtering at temperature T2;

[0014] S4: distill the filtered solid residue under reduced pressure to obtain chlorobenzene purified liquid.

[0015] Furthermore, the material A in S1 is an acidic material, and the acidic material is sulfuric acid.

[0016] Furthermore, the mass ratio of chlorobenzene bottom liquid to sulfuric acid in S1 is (5-10):1.

[0017] The chlorobenzene bottom liquid obtained in the distillation process of galaxol is put into an acidic environment and heated to cause the impurities and chloropropanol in the chlorobenzene bottom liquid to react with sulfuric acid.

[0018] Furthermore, the heating in S1 is performed to a temperature of 80-90°C.

[0019] Furthermore, the material B in S2 is an alkaline material, and the alkaline material is sodium hydroxide.

[0020] Furthermore, the amount of sodium hydroxide added in S2 is to adjust the pH to 13.

[0021] The base reacts with the incompletely separated acid to form a salt which dissolves in water and is separated from chlorobenzene.

[0022] Furthermore, the complexing agent in S3 is polyethylene glycol, and the amount of polyethylene glycol used is 0.75-1.5 of the mass of the chlorobenzene extract.

[0023] Through complexation reaction, chlorobenzene can be specifically adsorbed and separated by precipitation, which can further improve the purity of chlorobenzene.

[0024] Furthermore, in the S3, T1 is 40-50° C., and the complexing time is 5-10 min.

[0025] Furthermore, in said S3, T2 is 2-8° C., and the cooling time is 20-40 min.

[0026] By lowering the cooling temperature, the degree of thermal motion of the molecules will also decrease, which will be more beneficial to the stability of the system and the occurrence of complex reactions and the formation of complexes.

[0027] Furthermore, the reduced pressure distillation conditions in S4 are: 70° C., 0.005 MPa.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The purity of chlorobenzene solvent is improved through combined reaction purification of acid, alkali and complexing agent. The chlorobenzene content after re-distillation is increased from the original 82-86% to 94-98%. At the same time, the content of impurities is reduced, and the recovery rate of chlorobenzene solvent is greatly improved.

[0030] 2. The recovered chlorobenzene is returned to the system for reuse, which optimizes the reaction efficiency and material utilization of the entire production process and significantly increases the economic benefits of the enterprise. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0034] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0035] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0036] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0037] The purity is 98% and the yield is 80%.

[0038] Example 2

[0039] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 600 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0040] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0041] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0042] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0043] The purity is 98% and the yield is 75%.

[0044] Example 3

[0045] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 1200 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0046] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0047] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0048] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0049] The purity is 98% and the yield is 78%.

[0050] Example 4

[0051] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 1200 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0052] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0053] S3: The chlorobenzene extract was heated to 45°C and 4125 kg of polyethylene glycol was added, and the mixture was kept for 7 minutes after being evenly dispersed. The mixture was then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture, which was then filtered;

[0054] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0055] The purity is 93% and the yield is 85%.

[0056] Example 5

[0057] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 1200 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0058] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0059] S3: The chlorobenzene extract was heated to 45°C and 8250 kg of polyethylene glycol was added, and the mixture was kept for 7 minutes after being evenly dispersed. The mixture was then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture, which was then filtered;

[0060] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0061] The purity is 96% and the yield is 65%.

[0062] Example 6

[0063] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 1200 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0064] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0065] S3: The chlorobenzene extract was heated to 40°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0066] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0067] The purity is 97% and the yield is 78%.

[0068] Example 7

[0069] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 1200 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0070] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0071] S3: The chlorobenzene extract was heated to 50°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0072] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0073] The purity is 96% and the yield is 81%.

[0074] Example 8

[0075] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0076] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0077] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 5 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0078] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0079] The purity is 94% and the yield is 81%.

[0080] Example 9

[0081] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0082] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0083] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 10 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0084] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0085] The purity is 98% and the yield is 75%.

[0086] Example 10

[0087] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0088] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0089] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 2°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0090] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0091] The purity is 98% and the yield is 78%.

[0092] Embodiment 11

[0093] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0094] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0095] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 30 minutes to obtain a gel-bound mixture and filtered;

[0096] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0097] The purity is 96% and the yield is 81%.

[0098] Example 12

[0099] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0100] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0101] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 20 minutes to obtain a gel-bound mixture and filtered;

[0102] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0103] The purity is 90% and the yield is 83%.

[0104] Example 1

[0105] S1: 6000 kg of chlorobenzene bottom liquid (chlorobenzene content of about 83%) recovered from the re-evaporation of the galaxol distillation tower was pumped into a 10-cubic-meter indane recovery reactor, the steam valve was opened, stirring was started, the temperature was raised to 80°C, 800 kg of 98% sulfuric acid was added dropwise, the temperature was maintained at 85°C, and the mixture was stirred for 2.5 hours. After the insulation was completed, 400 L of pure water was added for washing for 1 hour, and the mixture was allowed to stand for 2 hours, and the sulfuric acid aqueous phase was separated to obtain a mixture 1;

[0106] S2: Add 12% sodium hydroxide by mass to the mixture 1 to adjust the pH to 13, stir for 1 hour, let stand for 2 hours, separate the lower salt water phase into the wastewater tank, and obtain 5500 kg of chlorobenzene extract;

[0107] S3: The chlorobenzene extract was heated to 45°C and 5500 kg of polyethylene glycol was added, and the mixture was evenly dispersed and kept for 7 minutes, and then cooled to 6°C and kept for 40 minutes to obtain a gel-bound mixture and filtered;

[0108] S4: distill the filtered solid residue at 0.005 MPa and 70° C. to obtain chlorobenzene purified liquid.

[0109] The purity is 98% and the yield is 60%.

[0110] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An industrial treatment method for removing impurities from chlorobenzene bottom liquid, characterized in that: The following steps are involved: S1: placing the chlorobenzene bottom liquid in a reactor, heating it and adding material A to react; after the reaction, adding deionized water for washing and standing to separate the layers, separating the aqueous phase to obtain a mixture 1; S2: adding material B to the mixture 1 to react, standing and stratifying after the reaction, separating the aqueous phase to obtain a chlorobenzene extract; S3: mixing the chlorobenzene extract with the complexing agent at temperature T1 to precipitate, and filtering at temperature T2; S4: distill the filtered solid residue under reduced pressure to obtain chlorobenzene purified liquid.

2. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: The material A in S1 is an acidic material, and the acidic material is sulfuric acid.

3. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 2, characterized in that: The mass ratio of chlorobenzene bottom liquid to sulfuric acid in S1 is (5-10):

1.

4. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: In the step S1, the temperature is heated to 80-90°C.

5. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: The material B in S2 is an alkaline material, and the alkaline material is sodium hydroxide.

6. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 5, characterized in that: The amount of sodium hydroxide added in S2 is to adjust the pH to 13.

7. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: The complexing agent in S3 is polyethylene glycol, and the amount of polyethylene glycol used is 0.75-1.5 of the mass of the chlorobenzene extract.

8. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: In the S3, T1 is 40-50° C., and the complexing time is 5-10 min.

9. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: In the S3, T2 is 2-8°C and the cooling time is 20-40min.

10. An industrial treatment method for removing impurities from chlorobenzene bottom liquid according to claim 1, characterized in that: The reduced pressure distillation conditions in S4 are: 70° C., 0.005 MPa.

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