Patent ID: 8598375

Claim:
A method of preparing dichloropropanol, the method comprising: performing a plurality of chlorination reaction stages of glycerol using a catalyst, wherein the plurality of chlorination reaction stages produce water as a by-product and the catalyst is acetic acid, wherein, in each of the chlorination reaction stages, a reaction product of the catalyst with glycerol is produced as a by-product, which functions as a catalyst for the chlorination of glycerol, and wherein a boiling point of the reaction product of the catalyst with glycerol is higher than that of water; and performing a water-removing stage between the chlorination reaction stages, independently of the chlorination reaction stages, wherein the chlorination reaction stages comprise converting glycerol into monochloropropanediol (MCP) and converting monochloropropanediol (MCP) into dichloropropanol (DCP), wherein the water-removing stage is performed using the boiling point difference between water and materials other than water, wherein a chlorinating agent is added to a chlorination reaction stage prior to the water-removing stage, and a separate chlorinating agent other than a chlorinating agent originated from the chlorination reaction stage prior to the water-removing stage is not added to the water-removing stage, wherein a separate catalyst other than a catalyst originated from the chlorination reaction stage prior to the water-removing stage is not added to a chlorination reaction stage after the water-removing stage.