US 2019/0077780 A1 · Method for Preparing Halohydrin and Epoxide

Abstract

Provided is a method for preparing an epoxide by halohydrination, the method comprising: (1) halohydrination: adding H2O, a halogen(s) and an olefin compound to a reaction device for reaction to obtain a halohydrin; (2) saponification: saponificating the halohydrin with an alkali metal hydroxide to obtain an epoxide and an alkali metal halide; (3) performing a bipolar membrane electrodialysis of the alkali metal halide to obtain an alkali metal hydroxide and a halogen hydride. Also provided is a method for preparing an epoxide by halohydrination, the method comprising: (1) halohydrination: halohydrinating a halogen hydride, an H2O2 and an olefin compound to obtain a halohydrin; optionally, (2) saponification: saponificating the halohydrin with an alkali metal hydroxide to obtain an epoxide and an alkali metal halide; optionally, (3) performing a bipolar membrane electrodialysis of the alkali metal halide to obtain an alkali metal hydroxide and a halogen hydride. The method according to the present invention can prepare a halohydrin or an epoxide at very high selectivity and yield, and greatly reduce the amount of waste water and waste slag discharges.

Claims16

Dependent claims

1-15. (canceled)

A method for preparing a halohydrin, said method comprising the step of:

(1) halohydrination:
adding a hydrogen halide, H2O2, and an ethylenically unsaturated compound or an olefin compound having one or more C═C double bonds to a reaction device, and performing halohydrination reaction, so as to obtain a halohydrin, wherein molar ratio of the ethylenically unsaturated compound or the olefin compound to the hydrogen halide is from 1:0.9-20,
wherein in said step (1), a catalyst is used, which is one, two or more selected from the group consisting of solid acids, molecular sieves, vanadium phosphorus oxide composites, molybdenum-vanadium composite metal oxides, molybdenum-bismuth composite metal oxides, molybdenum-tungsten composite metal oxides, Salen transition metal catalysts or heteropolyacids.

Dependencies are inferred from the claim text.

Facts

Application

16/085,054Filed 13 Mar 2017

Priority

CN 201610143839.X14 Mar 2016

Published

14 Mar 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

C07D 301/27
Preparation of oxiranes: condensation of epihalohydrins or halohydrins with compounds containing active hydrogen atoms
C02F 1/4693
By electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis: electrodialysis
C07C 29/64
Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring: by simultaneous…
C07C 31/34
Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms: halogenated alcohols

Method for Preparing Halohydrin and Epoxide

Life of this patent

Method for Preparing Halohydrin and Epoxide

Life of this patent

Abstract

Claims16