Prepn of cholrinated paraffin-70

Abstract

The preparation of chlorinated paraffin-70 with liquid chlorine and solid paraffin as material includes mixing gasified chlorine and molten paraffin in the reactor, and three-stage substitution reaction in temperature controlled in 50-200 deg.c and controlled time to produce chlorinated paraffin-70. The product has no carbon tetrachloride contained, high chlorine content, high softening point and good use performance. The preparation process has low cost and no corrosion to apparatus.

Description

(1) Technical field:

[0001] The invention relates to the technical field of organic flame retardants, in particular to a method for producing chlorinated paraffin-70 by a chemical-assisted thermal chlorination method. (two) background technology:

[0002] Chlorinated paraffin is an additive flame retardant, because of its low price and good flame retardant effect, it is favored by users. The traditional domestic preparation methods of chlorinated paraffin-70 mainly include the following three methods: one is " Carbon tetrachloride solvent method ", its technology is relatively mature, reacts at normal temperature and normal pressure, the speed is fast, the technical indicators such as chlorine content and softening point are the easiest to meet the requirements, the disadvantage is that RCl-42 is used, three to four Double carbon tetrachloride is used as a solvent, because carbon tetrachloride has a low boiling point, is volatile, is highly toxic to humans, and is a substanc...