Synthesis Of Solid(Methylene Chloride) Dimethyl Ammonium Chloride

Vilsmeier reagent is a kind of important formylation reagent. The Vilsmeier reagent can happen electrophilic substitution and nucleophilic substitution reaction in the synthesis of various aldehydes.Tts unique structure and characteristics has good application in the aspects such as pharmaceuticals, pesticides and dyes.At present, the "one-step" method is the most commonly used preparation method.The active low type I liquid chlorinating agent was added to the SOCl2 and N,N-dimethyl formamide raw materials in the production site.The reaction directly generated two type(Chloromethylene) dimethylammonium chloride,type I and type II.Type I dimethylammonium chloride is in liquid status. Type IIdimethylammonium chloride is insolid status.The type II status is moreactivethan type I. Some domestic production enterprises with N,N-dimethyl formamide as solvent, add sulfoxide chloride for the production of sucralose. However, SO2 generated in the production of type I need to use a secondary alkali absorption, order to avoid cause environmental pollution. As a result, not only increases the investment in equipment, but also to deal with byproduct--sodium sulfite, and the type II solid chlorinating agent generated SO2 will continue to overflow, causing the reactants spray reactor, prone to accidents.This paper discusses with phthalic anhydride and sulfoxide chloride as raw materials, after acyl chlorination reaction, and then with N,N-dimethylformamide was synthesized(Chloromethylene)-dimethylammonium chloride and phthalic anhydride, after filtration get(Chloromethylene)-dimethylammonium chloride. SO2 gas is recovered for SOCl2 production process to achieve the recycling of resources, at the same time to achieve green production. Therefore, the development, production(chlorine methylene) dimethyl ammonium chloride has a good social benefits.