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Epoxychloropropane and production method of midbody dichlorohydrin

A technology of epichlorohydrin and dichloropropanol, which is applied in the field of preparation of epichlorohydrin and its intermediate dichloropropanol, can solve the problem of high chlorine consumption and alkali consumption, high energy consumption and low yield and other issues to achieve the effect of good safety, simplified process and reduced consumption

Inactive Publication Date: 2008-06-11
BALING PETRO CHEM CO LTD SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has high chlorine consumption and alkali consumption (2 equivalents of chlorine gas and 1 equivalent of caustic soda per mole of epichlorohydrin), high energy consumption, low yield and many by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Heat up the mixture of 460g glycerin and 6g glacial acetic acid to 120°C, stir and mix for 15 minutes, feed anhydrous hydrogen chloride gas into the reaction mixture for 20 hours, a total of 730g, analyze the composition of the reaction mixture by gas chromatography, the conversion of glycerol The rate is 95%, the selectivity of dichloropropanol is 60%, and the selectivity of 3-chloropropanediol is 35%.

example 2～7

[0031] Add glycerol, catalyst, and hydrochloric acid into a constant-temperature glass reactor at a constant speed. A distillation column is installed above the reactor. The steam of the reaction mixture passes through the distillation column and then condenses into a decanter. The condensate is divided into two phases: the organic phase is rich in dichloropropane Alcohol, the water phase mainly contains unreacted hydrochloric acid and a small amount of dichloropropanol. The reaction mixture contained less than the product dichloropropanol. The test results are shown in the table below.

[0032] Test No.

example 8

[0034] The test was carried out in a reactive still. The dichloropropanol obtained in example 4 and 10% sodium hydroxide are preheated to 65 ℃, and the two are mixed at 90 ℃ in a certain proportion (alkali magnification 1.1) and the product epichlorohydrin is distilled out rapidly, and then Crude epichlorohydrin is distilled and rectified to obtain refined epichlorohydrin with a content of 99.5%.

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PUM

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Abstract

The invention provides a method for using by-product glycerin of recyclable material bio-diesel as material to produce organic compounds as dichlorohydrin and epichlorohydrin. In the presence of catalyst carboxyl acid or relative derivative, glycerin is reacted with chlorizating agent as hydrochloride or alcaine to produce dichlorohydrin, and the dichlorohydrin in the presence of alkali is dewatered to produce epichlorohydrin.

Description

technical field [0001] The present invention relates to a kind of preparation method of epichlorohydrin and its intermediate dichloropropanol Background technique [0002] The existing preparation method of epichlorohydrin is mainly high-temperature chlorination of propylene. First, propylene is chlorinated at high temperature to generate chloropropene, then chloropropene is hypochlorinated to generate dichloropropanol, and finally dichloropropanol is cyclized with caustic alkali to generate epichlorohydrin. The process has high chlorine consumption and alkali consumption (2 equivalents of chlorine gas and 1 equivalent of caustic soda per mole of epichlorohydrin), high energy consumption, low yield and many by-products. [0003] Another method for preparing epichlorohydrin is the propylene acetate method, that is, first propane is oxidized to generate propylene acetate, and then propylene acetate is hydrolyzed, chlorinated, and caustic alkali cyclized to generate epichloroh...

Claims

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Application Information

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IPC IPC(8): C07D301/26C07C29/62C07C31/36
Inventor 李馥梅夏金魁熊远凡唐小平程延亭
Owner BALING PETRO CHEM CO LTD SINOPEC
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