Hydroquinone preparation method

A technology of hydroquinone and p-chlorophenol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low recovery rate of manganese resources, serious environmental pollution, and high equipment costs, and achieve recycling The effect of good application effect, low equipment investment and high production cost

Active Publication Date: 2015-05-20
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the consumption of raw materials is high, and a large amount of manganese sulfate, ammonium sulfate waste liquid and iron sludge are produced in the production process, which seriously pollu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] Put 106.6g of p-chlorophenol, 581.0g of 40% potassium hydroxide, KOH / ZrO into a 1L autoclave 2 Catalyst 10.7g, heated after nitrogen replacement, controlled the reaction temperature at 215°C, reacted for 12 hours, the alkali hydrolyzate was filtered to recover the catalyst, the filtrate was acidified with 35% concentrated hydrochloric acid 430g to pH=2~3. The conversion rate of p-chlorophenol is 98.5% and the selectivity of hydroquinone is 87.1%.

Example Embodiment

[0029] Example 2

[0030] Put 21.3g of p-chlorophenol, 493.9g of 10% potassium hydroxide, NaOH / ZrO into a 1L autoclave 2 The catalyst was 3.0g, after nitrogen replacement, the temperature was raised, the reaction temperature was controlled to 210°C, and the reaction was carried out for 12 hours. The alkali hydrolyzate was filtered to recover the catalyst, and the filtrate was acidified with 35% concentrated hydrochloric acid 93.0g to pH=2~3. The conversion rate of p-chlorophenol was 78.2%, and the selectivity of hydroquinone was 89.4%.

Example Embodiment

[0031] Example 3

[0032] Put 79.9g of p-chlorophenol, 522.9g of 25% potassium hydroxide and Na in a 1L autoclave 2 CO 3 / ZrO 2 The catalyst was 9.7g, after nitrogen replacement, the temperature was raised, the reaction temperature was controlled at 220°C, and the reaction was conducted for 8 hours. The alkali hydrolyzate was filtered to recover the catalyst, and the filtrate was acidified to pH=2~3 with 245.3g of 35% concentrated hydrochloric acid. The conversion rate of p-chlorophenol was 82.4%, and the selectivity of hydroquinone was 90.1%.

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PUM

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Abstract

The present invention relates to a hydroquinone preparation method, especially to a method for preparing hydroquinone by adopting a supported solid alkali as a catalyst and carrying out an alkaline hydrolysis reaction on p-chlorophenol and a potassium hydroxide solution. According to the present invention, the supported solid alkali is adopted as the catalyst, the p-chlorophenol and the potassium hydroxide solution are subjected to an alkaline hydrolysis reaction at a certain temperature, the alkaline hydrolysis solution is filtered to recover the catalyst so as to be applied indiscriminately, the filtrate is acidified with hydrochloric acid to achieve the pH value of 2-3, the reaction product is extracted with methyl isobutyl ketone, and the raw material content and the product content in the raffinate are less than 0.05%.

Description

technical field [0001] The invention relates to a method for preparing hydroquinone, in particular to a method for preparing hydroquinone through alkaline hydrolysis reaction of p-chlorophenol and potassium hydroxide solution by using a loaded solid base as a catalyst. Background technique [0002] Hydroquinone is mainly used as a photographic imaging agent, a drug raw material, a polymerization inhibitor added during monomer storage and transportation, a rubber antioxidant, an azo dye, an anthraquinone dye, a stabilizer, an antioxidant, etc. [0003] There are more than ten production methods of hydroquinone, among which the main ones that have been industrialized are aniline oxidation, dicumyl peroxidation, bisphenol A, and phenol hydrogen peroxide hydroxylation. [0004] Aniline oxidation is the earliest production method of hydroquinone. The production process usually includes a two-step reaction, that is, aniline is oxidized to p-benzoquinone by manganese dioxide (or s...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/02
CPCC07C37/02C07C39/08
Inventor 程晓曦顾克军徐林顾志强丁克鸿黄杰军张晓谕缪荣荣
Owner JIANGSU YANGNONG CHEM GROUP
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