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P-cresol preparation method and equipment

A technology of p-cresol and sodium cresate, which is applied in the chemical industry, can solve problems such as difficult production control, harsh reaction conditions, and impact on product quality, and achieve good environmental protection effects, short process, and labor-saving effects

Inactive Publication Date: 2016-08-31
JINNENG SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] The reaction conditions of this scheme are harsh, high temperature, high pressure, many impurities, such as anisole, etc. have seriously affected the product quality, production control is relatively difficult, and the yield of p-cresol is relatively low, so this method is often used to produce 2,6-2 cresol and m-cresol

Method used

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  • P-cresol preparation method and equipment
  • P-cresol preparation method and equipment
  • P-cresol preparation method and equipment

Examples

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Embodiment Construction

[0076] The following specific examples illustrate the implementation process and beneficial effects of the present invention in detail, which are intended to help readers better understand the essence and characteristics of the present invention, and are not intended to limit the scope of implementation of this case.

[0077] Combined with the current mature toluene sulfonation alkaline fusion process for the production of p-cresol, the inventor changed most of the intermittent production mode to continuous production mode, reducing the number of equipment and investment under the condition of a certain capacity. Increase production capacity. The continuous production process of the present invention is divided into six sections, such as figure 1 Shown:

[0078] (1) Sulfur trioxide production section (such as figure 2 Shown):

[0079] 1. Sulfur incineration process: solid sulfur is transported by belts to melt in the sulfur melting tank, and liquid sulfur flows from the overflow to...

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Abstract

The invention provides a p-cresol preparation method and equipment. The method comprises the following steps that toluene and sulphuric acid take a reaction to obtain paratoluenesulfonic acid; the paratoluenesulfonic acid then takes a reaction with sodium sulfite to obtain sodium p-toluenesulfonate; the sodium p-toluenesulfonate generates sodium p-cresol under the alkaline condition; the p-cresol is generated by the sodium p-cresol under the alkaline condition. The method and the equipment can thoroughly solve the problem that in the current p-cresol production process, a great amount of waste water, waste gas and waste slag are generated; the automation level of the equipment is improved; most intermittent production is changed into continuous production; the work environment is improved.

Description

Technical field [0001] The invention relates to the field of chemical engineering, and specifically to a preparation method and equipment of p-cresol. Background technique [0002] P-cresol is an important fine chemical intermediate, mainly used in the synthesis of medicines, pesticides, perfumes, dyes, antioxidants, polymerization inhibitors, ultraviolet absorbers, fuel additives, rubber additives, etc., and is an important raw material for fine chemicals. The main synthetic methods of p-cresol include toluene sulfonation alkali melting method, phenol methylation method, cumene method, p-toluidine method, etc. The industrial production of p-cresol simultaneously produces p-cresol, o-cresol, and m-cresol. 3 isomers of cresol. The domestic industrial production of p-cresol generally adopts the toluene sulfonation alkali fusion method, and most of the production process adopts intermittent production. The sulfonation with sulfuric acid as the sulfonating agent will produce a large...

Claims

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Application Information

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IPC IPC(8): C07C37/00C07C39/07C07C303/06C07C303/44C07C309/30
CPCC07C37/00C07C37/64C07C303/06C07C303/32C07C303/44C07C39/07C07C309/30
Inventor 刘红伟秦庆平周文明
Owner JINNENG SCI & TECH
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