| abstract |
The present invention relates to a method for preparing chlorohydrin by chlorination of polyol such as glycerin with hydrogen chloride. The method of the present invention is composed of the following processes: reaction mixture feed comprising polyol, hydrogen chloride and organic acid (catalyst for chlorination) is loaded into the first reactor, in which chlorohydrin is generated by chlorination; the first product mixture feed containing the chlorohydrin and non- reacted reaction mixture discharged from the first reactor and the additional polyol feed are supplied to the second reactor, in which chlorohydrin is generated by additional chlorination; the second product mixture feed containing the chlorohydrin discharged from the second reactor is loaded in distillation column and then distillation product containing chlorohydrin is separated through the top of the distillation column; and some re-circulated feed of distillation residual solution containing chlorohydrin, is re-circulated into the first reactor. |