Process for the production of ethylene glycol

Details Process for the production of ethylene glycol Process for the production of ethylene glycol

Filed on

1976-06-23

Date issued

1978-05-02

Examiner

Thomas, Jr., James O.

Patent Class

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

SubClass

Organic compounds

SubSubClass

Oxygen containing

Other Related Categories

260449M, C07C 3118

Type

Patent

Status

active

Patent number

040874702

Description

ABSTRACT:
A cyclic process for producing ethylene glycol comprising the steps of:
(1) contacting formaldehyde with a synthesis gas comprising carbon monoxide and hydrogen in the presence of a catalytic amount of hydrogen fluoride under conditions effective to deplete carbon monoxide from the synthesis gas and produce glycolic acid and diglycolic acid;
(2) contacting the acid product of step (1) with ethylene glycol, diethylene glycol, or mixtures thereof under conditions effective to produce ethylene glycol glycolate and diglycolate, diethylene glycol glycolate and diglycolate, or mixtures thereof;
(3) removing residual carbon monoxide from the carbon monoxide depleted synthesis gas of step (1) thereby producing a hydrogen rich gas;
(4) contacting the glycolate and diglycolate product of step (2) with the hydrogen-rich gas mixture of step (3) under conditions effective to produce ethylene glycol, diethylene glycol, or mixtures thereof; and
(5) recycling from step (4) to step (2) an amount of the glycol product effective to esterify substantially all the acid product present in the reaction zone of step (2).

REFERENCES:
patent: 2285448 (1942-06-01), Loder
patent: 3911003 (1975-10-01), Suzuki
patent: 3930812 (1976-01-01), Harris et al.

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