US 9,850,190 B2 · Process for preparing dichloropropanol

Abstract

Provided is a process of preparing dichloropropanol, DCP. The process includes the step of: subjecting a three-carbon material to a first chlorination reaction with an aqueous hydrochloric acid solution in the presence of a carboxylic acid catalyst; adding the three-carbon material into the first mixture solution to undergo a second chlorination reaction and obtain a second mixture solution containing less than 13 wt % of hydrochloric acid; distilling the second mixture solution; and purifying the overhead product by oil-water separation to obtain DCP from the oil phase. By lowering the concentration of the hydrochloric acid contained in the mixture to be distilled, the DCP product can be straightly obtained via distillation and oil-water separation, thereby effectively simplifying the process of preparing DCP.

Claims20

Dependent claims

A process of preparing dichloropropanol, comprising steps of:

step (a):
subjecting a three-carbon material to a first chlorination reaction with an aqueous hydrochloric acid solution in the presence of a carboxylic acid catalyst, to obtain a first mixture solution, the three-carbon material comprising glycerin, glycerin ester, monochloropropanediol, monochloropropanediol ester or their combination;
step (b):
adding the three-carbon material into the first mixture solution to undergo a second chlorination reaction, to obtain a second mixture solution, the second mixture solution containing hydrochloric acid in a concentration less than 13 wt %;
step (c):
distilling the second mixture solution to obtain an overhead product;
and
step (d):
separating the overhead product into an oil phase and an aqueous phase, to collect the dichloropropanol from the oil phase.

6 more elements

Dependencies are inferred from the claim text.

Process for preparing dichloropropanol

Life of this patent

Process for preparing dichloropropanol

Life of this patent

Abstract

Claims20