Method of preparing and separating epichlorohydrin by chloropropene epoxidation

Abstract

The invention discloses an epoxidizing method of epoxy chloropropane through chloropropene, which comprises the following steps: adopting excessive chloropropene to produce epoxy chloropropane directly under phosphotungstic acid quaternaries as catalyst and alkyl phenol polyoxyethylene ester as adjuvant catalyst and hydrogen peroxide solution as oxidant to reflux; cooling reactant; recycling solid-phased catalyst; distilling oil phase of reacting liquid to recycle residual chloropropene; decompressing; distilling; obtaining the purified product.

Description

technical field [0001] The invention relates to a process for preparing, separating and purifying epichlorohydrin by using allyl chloride. Background technique [0002] The current production of epichlorohydrin is mainly based on the chlorohydrin method, but due to the large amount of sewage discharge in this process, it causes great pollution to the environment, high material consumption and high energy consumption in the process, so that the production cost of the product is too high. Therefore, all countries are researching environmentally friendly processes that can replace traditional processes. [0003] There are various processes currently being explored, but the most notable ones are only the titanium-silicon molecular sieve method and the phosphotungstic acid heteropolyacid method. Titanium silicon molecular sieve method has been done a lot of research at home and abroad, but there is no report of industrialization so far. [0004] In 1983, Venturello reported tha...

AI Technical Summary

Problems solved by technology

The third is that titanium-silicon molecular sieves are easy to deactivate and complex to regenerate

prone to permanent inactivation

[0008] The high-temperature chlorination of propylene in the existing epichlorohydrin (ECH) production process has high chlorine consumption, high material consumption, and large energy consumption; serious equipment corrosion and high maintenance costs; a large amount of chlorine-containing waste water (every production 1 1 ton of ECH produces about 50 to 60 tons of waste water)

However, the material consumption, energy consumption, amount of by-products and waste water of the propylene acetate method have all decreased, but the process is longer, and the corrosion of equipment and the discharge of waste water are still relatively serious.