Refining method of chloropropene epoxidation prepared epichlorohydrin products

Abstract

The invention provides a refining method of chloropropene epoxidation prepared epichlorohydrin (ECH) products. The refining method comprises following steps: an extracted phase of a chloropropene epoxidation prepared ECH reaction distillate is introduced into T201 for rectification, a part of an oil phase part obtained through tower top gas condensation is send back into the tower, and a part of the oil phase part is introduced into a reaction unit for recycling; a T201 tower bottom material is introduced into a T202 for rectification; a part of a product obtained through T202 tower gas condensation is sent back into the tower, and a part of the product is introduced into an ECH recycling tower; an obtained T202 tower bottom material is introduced into a T203 for rectification; a part of amixture obtained through T203 tower top gas condensation is send back into the tower, and a part of the mixture is discharged as an ECH product; an obtained T203 tower bottom material is introduced into a T204 for rectification; a part of a mixed product obtained through T204 tower top gas condensation is sent back into the tower, and a part of the mixed product is send back into the T202; an obtained T204 tower bottom material is cooled, and is introduced into a high boiling point substance storage tank; an obtained T202 tower top material is subjected to T205 rectification, a part of a mixed substance obtained through tower top gas condensation is sent back into the tower, and a part of the mixed substance is introduced into a T206 for rectification; an obtained T205 bottom material issent back into the T202; a part of a substance obtained through T206 tower top gas condensation is sent back into the tower, and a part of the substance is introduced into the reaction unit for recycling; and an obtained T-206 tower bottom substance is cooled, and is introduced into a low boiling point storage tank.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of chemical substances, and in particular relates to the product purification of epichlorohydrin prepared by oxidizing allyl chloride and hydrogen peroxide and a method for separating 1-chloropropane from allyl chloride. Background technique [0002] Epichlorohydrin (ECH), also known as epichlorohydrin, is an important organic chemical raw material and fine chemical product, mainly used in the synthesis of glycerin, epoxy resin, epichlorohydrin rubber, nitroglycerin explosives, etc., and can also be used as fiber It is a solvent for plain esters, resins and cellulose ethers; it is also the main raw material for the production of surfactants, plasticizers, stabilizers, adhesives and ion exchange resins. The epoxy resin prepared from it has the characteristics of strong adhesion, resistance to chemical medium corrosion, low shrinkage, good chemical stability, high impact strength...

AI Technical Summary

Problems solved by technology

[0006] However, since 3-chloropropene contains a small amount of 1-chloropropane in the reaction raw material, it does not participate in the reaction, and its boiling point is close to that of 3-chloropropene, so it is difficult to separate the two

In the recovery process of excess chloropropene after the reaction, it will continue to accumulate and increase, resulting in a decrease in the quality of circulating 3-chloropropene, which in turn affects the quality of crude epichlorohydrin rectification and product epichlorohydrin

This is a key problem in the production of epichlorohydrin by hydrogen peroxide oxidation, and has seriously affected the deepening, popularization and application of the technology.

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