Purification of 2,3-dichloro-1-propanol

Details Purification of 2,3-dichloro-1-propanol Purification of 2,3-dichloro-1-propanol

Filed on

1992-11-25

Date issued

1993-07-13

Examiner

Cintins, Marianne M.

Patent Class

Organic compounds -- part of the class 532-570 series

SubClass

Organic compounds

SubSubClass

Oxygen containing

Other Related Categories

568913, C07C 3134

Type

Patent

Status

active

Patent number

052275418

Description

ABSTRACT:
A process for purifying 2,3-dichloro-1-propanol is disclosed, which comprises introducing a chlorination reaction mixture obtained by chlorination of allyl alcohol in a hydrochloric acid aqueous solution in a reactor, to a degassing tower, where hydrogen chloride is released, returning the hydrogen chloride to the chlorination reactor, cooling the residual liquid to separate into an aqueous layer and an oily layer, and returning the aqueous layer to the chlorination reactor while recovering 2,3-dichloro-1-propanol from the oily layer, wherein said oily layer is introduced to a first distillation tower, where hydrogen chloride, part of the produced 2,3-dichloro-1-propanol, and other low-boiling components are recovered as a distillate, cooling the distillate to separate it into an aqueous layer and an oily layer, returning the aqueous layer of the distillate to the chlorination reactor, and recovering 2,3-dichloro-1-propanol from the oily layer of the distillate and a high-boiling fraction of the first distillation tower. Where 2,3-dichloro-1-propanol is for use as a starting material of epichlorohydrin, the process involves no wasteful consumption of calcium hydroxide.

REFERENCES:
patent: 3891511 (1975-06-01), Danneil et al.
patent: 4634784 (1987-01-01), Nagato et al.

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