Continuous preparation method for producing chlorohydrocarbon through carbon tetrachloride and olefins

Abstract

The invention discloses a continuous preparation method for producing chlorohydrocarbon through carbon tetrachloride and olefins. The method includes the following steps that firstly, iron powder or iron filler, alkyl phosphate as catalyst promoters and carbon tetrachloride are continuously added into a first ferrous complex catalyst preparation kettle; secondly, materials obtained after reaction of the first step fast pass a filter, then are conveyed to a second chlorohydrocarbon synthesis reaction kettle, and react with olefins continuously introduced into the chlorohydrocarbon synthesis reaction kettle at the same time; thirdly, chlorohydrocarbon crude products obtained in the second step are introduced into a later separation system, and final target chlorohydrocarbon products are purified and collected. According to the method, it is designed that a ferrous complex catalyst preparation reaction and a chlorohydrocarbon synthesis reaction are isolated, and it is avoided that olefins autopolymer adheres to iron, and consequently the catalytic activity of iron powder or iron filler is reduced. The method is simple in technology, by controlling temperature, time, pressure and the like of reactions, reaction efficiency is further improved, meanwhile, the yield of reaction products is higher, and selectivity is better.

Description

technical field [0001] The invention relates to a continuous preparation method for producing chlorinated hydrocarbons from carbon tetrachloride and olefins. Background technique [0002] The structural formula in this field is CCl 3 CH 2 Chlorinated hydrocarbon (such as 1,1,1,3,3-pentachloropropane) preparation method of CHnClm (n=0~2, m=3-n) The current patent report mainly adopts batch reaction preparation and continuous reaction to prepare two In this process, the catalytic system adopts cuprous chloride complex catalytic system and iron catalytic system respectively. When adopting batch reaction to prepare chlorinated hydrocarbons, the production efficiency is low, and it is not suitable for industrialized mass production of products. An obvious defect in the use of cuprous chloride complex catalyst system is that the complex catalyst of cuprous salt cannot be recycled, because when recycling chlorinated products, the catalyst and catalyst additives must be removed b...

AI Technical Summary

Problems solved by technology

When the olefin self-polymer accumulates in the reactor for a long time, it will wrap the iron powder or iron filler, causing the iron powder or iron filler to stick to each other and agglomerate, so it will be very unfavorable to the activity of iron powder or iron filler Impact

Moreover, it is not easy to remove the iron powder or iron filler wrapping sticking to the wall of the kettle or the stirring paddle, which will have a destructive effect on the continuity of production.

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