Method for preparing 1,1,1,3,3 - pentachlorobutane from materials of chloropropene and carbon tetrachloride under tempering and polymerizing catalyst

Abstract

This invention relates to a method for preparing 1, 1, 1, 3, 3-pentachorobutane from 2-chloropropylene and tetrachloromethane in the presence of telomerization catalyst. The major catalyst is selected from Fe (II) salts, Fe and Fe (III) salts. The assistant catalyst is selected from alkyl phosphites and/or alkyl phosphates. This invention solves the problems of high catalyst toxicity, uneasy washing and recovery of viscous semi-solid catalyst, low conversion rate of the raw materials, low yield of the product, and large quantities of solvents needed faced by present techniques. The method in this invention does not need organic solvent, and can easily control the reaction temperature and pressure. The catalyst can be easily separated from the product, and can be recycled.

Description

technical field [0001] The present invention relates to the preparation method of 1,1,1,3,3-pentachlorobutane, especially telomerization of 2-chloropropene and carbon tetrachloride as raw materials to prepare 1,1,1,3,3-pentachlorobutane butane method. Background technique [0002] 1,1,1,3,3-pentachlorobutane (referred to as HCC-360jfa) is the raw material for the preparation of 1,1,1,3,3-pentafluorobutane (referred to as HFC-365mfc), 1,1,1 , 3,3-pentafluorobutane is a hydrofluoroalkane, its ODP value (atmospheric ozone depletion potential value) is 0, and its GWP value (global warming potential) is 830. It is a substitute for HCFC-141b and CFC-11 , can be widely used as foaming agent, cleaning agent and other fields. [0003] As we all know, multi-carbon halogenated alkanes are prepared by the catalytic addition of alkenes and halogenated alkanes. In the existing 1,1,1,3,3-pentachlorobutane preparation technology, there are already quite a few...

AI Technical Summary

Problems solved by technology

[0009] (1). Catalysts are highly toxic; if copper salts, cuprous salts and amines are used as catalysts, a viscous semi-solid will be formed after the reaction, which is difficult to separate except for washing with water in actual operation. Bring waste water treatment and recovery of copper ions;

[0010] (2). Low conversion rate of raw materials and low product yield;

[0011] (3). The reaction system requires a large amount of organic solvents to participate, and the reaction temperature and reaction pressure are high

[0012] Above-mentioned defect promptly will increase production cost, has brought potential safety hazard again; And reaction product 1,1,1,3,3-pentachlorobutane will pass through complex separation operation, a series of problems such as catalyst recycling cost height, all will affect industrial production

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