New clean resorcinol production method

A clean production and resorcinol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of increasing the difficulty of impurity treatment, difficulty of waste liquid treatment, and large secondary pollution, etc., to achieve The prospect of large-scale industrial production, the effect of low alkali consumption and low waste acid content

Active Publication Date: 2010-02-10
HUBEI XIANGYUN GROUP CHEM
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Problems solved by technology

Further, the sulfur dioxide produced by the reaction of sulfonate and sulfite in the neutralization process can be used in the acidification process. This method is very good, but using Glauber's nitric acid as a nitrating agent will

Method used

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Embodiment Construction

[0007] The present invention will be further described below in conjunction with embodiment.

[0008] to SO 3 Preheat the pipeline for 5 minutes, keep the feed temperature at 75-100°C, pass dry air to remove the gaseous SO 3 Diluted to 4-5%, SO 3 Enter 1.3kg of benzene into the injection ring reactor according to the volume of 500-5000:1 for the first sulfonation reaction, the temperature of the first sulfonation is controlled at about 50°C, and after the first sulfonation is completed, liquid SO 3 1.4kg was subjected to disulfonation reaction, and the temperature was controlled at 177-180°C.

[0009] Add the above-mentioned disulfonated product and 2.8kg of 30% liquid caustic soda to the neutralization kettle for neutralization reaction, adjust the pH value to 7-8, then filter at 65°C, put 5kg of flake caustic soda into the caustic soda and melt it with neutralization For the reaction of sodium m-benzenedisulfonate produced at the post, the temperature is controlled at 320...

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Abstract

The invention relates to a new clean resorcinol production method, in particular to a process of the new clean resorcinol production method. The process comprises the following steps: respectively adding gaseous SO3 and liquid SO3 as sulfonating agents and benzene to a circular injection reactor for a secondary sulfonating reaction; and recycling a byproduct NaCl generated in a sulfonating working procedure in a sodium fluosilicate workshop. The method consumes acid in one third amount of oleum, generates a sulfoacid product containing little waste acid, reduces alkali consumption for neutralization, greatly decreases the raw material cost, provides self-sufficiency industrial salt and has wide industrialized production prospects.

Description

technical field [0001] The invention relates to a clean production method of resorcinol. Background technique [0002] Resorcinol is an important fine chemical raw material, widely used in rubber, plastics, medicine, pesticides, dyes and other industries. The benzene sulfonation alkali fusion method is the traditional method for producing resorcinol. Both are produced by this method, which requires a large amount of strong acid and strong alkali, and produces a large amount of inorganic salt Na 2 SO 3 、Na 2 SO 4 , the cost of waste liquid treatment is higher, and the pollution is more serious. [0003] Chinese Invention Patent Application Publication No. CN1970520 discloses a clean production method of resorcinol, in which benzene is used as raw material through sulfonation, neutralization, alkali fusion, dilution, acidification, filtration, extraction and distillation to produce resorcinol In the process, the extracted mother liquor replaces the fresh water and circula...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/04
Inventor 叶良俊桂耀超李永鹏张险峰
Owner HUBEI XIANGYUN GROUP CHEM
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