METHOD FOR PRODUCTION OF DICHLOROPROPANOLS FROM GLYCEROL

摘要

Method for production of dichloropropanols from glycerol using continuous method, in the presence of acetic acid as a catalyst, with the catalyst concentration in the reacting mass varying in the range of 0.0005 to 0.007 mol/L, and the process of hydrochlorina¬ tion is carried out in the temperature range from 80 to 160°C, consists in the fact that hydrochlorination of glycerol is carried out in two stages, while in the first stage, glycer¬ ol is subjected to wet hydrochlorination using hydrochloric acid contained in the stream of acidic dichloropropanols, then the post-reaction mass from the first stage of hydro¬ chlorination is directed to a reactive column, in which completing the reaction of resi¬ dues of dissolved hydrogen chloride is carried out, as well as separation of the post- reaction mixture to stream of diluted dichloropropanols and decoction stream, which is directed to the second stage of dry hydrochlorination under pressure with gaseous hy¬ drogen chloride; after the second stage of hydrochlorination, the post-reaction mixture is directed to a distillation column, in which dewatering is carried out, while the distillate from the distillation column is directed to the first stage of glycerol hydrochlorination as a stream of acidic dichloropropanols, and the decoction being a stream of concentrated dichloropropanols is subjected to rectification.