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Method for preparing anthraquinone

An anthraquinone and process technology, applied in the field of anthraquinone preparation, can solve problems such as environmental pollution, achieve the effects of reducing environmental pollution, reducing comprehensive preparation costs, and increasing yield

Active Publication Date: 2019-03-22
辽宁坤泰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only cause some pollution to the environment, but at the same time every ton of anthraquinone produced will have 0.6 tons of Al 2 o 3 Bai Bailang wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The invention provides a preparation method of anthraquinone, which comprises steps of condensation, hydrolysis, ring closure and dilution;

[0035] Condensation process

[0036] In the application, the condensation process is:

[0037] According to the weight ratio of benzene: aluminum trichloride: phthalic anhydride = 1: (2-10): (1-6), first send benzene into the condensation kettle, start stirring and add aluminum trichloride, and then put in phthalic anhydride. Keep the temperature in the kettle at 20-50°C to make the reaction completely generate aluminum o-benzoylbenzoate. After the reaction, raise the temperature to 55-65°C and keep it warm for 1-5 hours;

[0038] As a preferred technical scheme, the condensation process is:

[0039] According to the weight ratio of benzene: aluminum trichloride: phthalic anhydride = 1:3-4:2, first send benzene into the condensation kettle, start stirring and add aluminum trichloride, then put in phthalic anhydride, and keep th...

Embodiment 1

[0076] Embodiment 1 provides a preparation method of anthraquinone, including condensation, hydrolysis, ring closure, dilution process, mother liquor retreatment process, waste sulfuric acid water retreatment process.

[0077] Condensation process

[0078] According to the weight ratio of benzene: aluminum trichloride: phthalic anhydride = 1:3.4:2, first send benzene into the condensation kettle, start stirring and add aluminum trichloride, and then put in phthalic anhydride. Make the reaction completely generate aluminum o-benzoylbenzoate, heat up to 60°C after the reaction, and keep the temperature for 1 hour;

[0079] Hydrolysis process

[0080] a. Hydrolysis and acidification: put the aluminum phthaloylbenzoic acid salt that has completed the condensation reaction into a hydrolysis kettle filled with bottom water, add dilute sulfuric acid with a mass concentration of 10%, and react to generate o-benzoylbenzoic acid;

[0081] b. Separation: after the completion of the ...

Embodiment 2

[0102] Embodiment 2 provides a preparation method of anthraquinone, including condensation, hydrolysis, ring closure, dilution process, mother liquor retreatment process, waste sulfuric acid water retreatment process.

[0103] The difference between embodiment 2 and embodiment 1 is the hydrolysis process, and the hydrolysis process of embodiment 2 is:

[0104] Hydrolysis process

[0105] a. Hydrolysis and acidification: put the aluminum phthaloylbenzoic acid salt that has completed the condensation reaction into a hydrolysis kettle filled with bottom water, add dilute sulfuric acid with a mass concentration of 10%, and react to generate o-benzoylbenzoic acid;

[0106] b. Separation: after the completion of the reaction, carry out static layering, and discharge the lower layer mother liquor from the bottom of the reaction kettle after layering, so as to stay in the benzene-soluble o-benzoylbenzoic acid at the bottom of the reaction kettle; collect the lower layer mother liquo...

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PUM

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Abstract

The invention discloses a method for preparing anthraquinone. The method comprises procedures of condensation, hydrolysis, cycle closure, dilution procedures, mother liquid retreatment procedures andwaste sulfuric acid retreatment procedures. A simple process is adopted, circulation is achieved, waste is turned into wealth, commercial chemical raw materials are respectively recycled from waste aluminum salt water and waste sulfuric acid water, the comprehensive preparation cost is greatly reduced, and the environment pollution is reduced. Wastewater with an aluminum salt is generated in the hydrolysis procedure, that is, a mother liquid, the mother liquid contains a certain amount of o-benzoylbenzoic acid, after improvement of the hydrolysis procedure, unseparated o-benzoylbenzoic acid ina lower layer of the mother liquid can be separated, the yield of the anthraquinone can be increased, the purity of a composite water purifier in the mother liquid can be improved, and the compositewater purifier is free of impure color. In addition, the turbidity removal capability of the composite water purifier prepared by using the method is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of anthraquinone. Background technique [0002] Anthraquinone is an important chemical raw material, which is widely used in the fields of synthetic pigments, papermaking and agricultural production to prevent birds from eating fruits. The current global annual output is about 90,000 tons. The preparation of synthetic anthraquinone in the prior art is to condense phthalic anhydride and benzene under the catalysis of anhydrous aluminum trichloride to generate benzoylbenzoic acid aluminum compound salt, which is hydrolyzed and acidified to obtain benzoylbenzoic acid, and then oleum It is a finished product obtained by dehydrating and closing the dehydrating agent. The existing technology for preparing and synthesizing anthraquinone includes: polymerization→hydrolysis→acidification→distillation→granulation→suction filtration→centrifugal dehydration→p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C46/00C07C50/18C07C51/41C07C65/34
Inventor 郭瑞莉于保同李慧李科田传虎
Owner 辽宁坤泰化工有限公司
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