Production process for preparing epoxy chloropropane by glycerol method

Abstract

The invention relates to the technical field of epoxy chloropropane production, and particularly discloses a production process for preparing epoxy chloropropane by a glycerol method. Glycerol, a catalyst and hydrogen chloride are added into a reactor and are reacted to generate monochloropropanol and water in the reactor, the monochloropropanol continuously reacts with hydrogen chloride in the reactor to generate dichloropropanol, the raw materials react in the reactor for a period of time, an obtained product enters a reactive distillation tower, the raw materials in the reactive distillation tower are reacted and separated, dichloropropanol obtained through hydrochlorination is fed into a pre-reactor and undergoes a cyclization reaction together with an alkali liquor, most liquid caustic soda is added from an inlet of the pre-reactor, the other part of the alkali liquor is added through a feeding side line of the pre-reactor, the product obtained in the pre-reactor, remaining 1,2-dichloropropanol and the alkali liquor enter a cyclization tower and fully react to generate epoxy chloropropane, and the product obtained at the tower top of the cyclization tower is fed into a secondrectifying tower and further separated to obtain epoxy chloropropane at the tower top.

Description

technical field [0001] The invention relates to the technical field of epichlorohydrin production, in particular to a production process for preparing epichlorohydrin by a glycerol method. Background technique [0002] With the rapid development of the biodiesel industry, a large amount of glycerin is produced by-product, and the process of synthesizing epichlorohydrin with glycerol has strong market competitiveness. The glycerol method for preparing epichlorohydrin is based on glycerin and hydrogen chloride as raw materials, and under the action of a catalyst, a chlorination reaction occurs to generate dichloropropanol, and then dichloropropanol is cyclized to generate epichlorohydrin. The process has the advantages of simple process, low investment, low operating cost and less waste discharge. [0003] At present, the chlorination of glycerol is generally carried out in multiple stirred tank reactors or bubbling reactors. During the reaction process, water is continuously...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a production process for preparing epichlorohydrin by the glycerin method, which has the advantages of high reaction efficiency, saving raw materials, and high production efficiency, and solves the problem of many side reactions of hydrolysis and large amount of wastewater generated in the traditional production process. The problem

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