Process for the preparation of propylene glycol carbonate

Details Process for the preparation of propylene glycol carbonate Process for the preparation of propylene glycol carbonate

Filed on

1994-05-31

Date issued

1995-09-12

Examiner

Tsang, Cecilia

Patent Class

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

SubClass

Organic compounds

SubSubClass

Heterocyclic carbon compounds containing a hetero ring...

Other Related Categories

549228, 549229, C07D31736, C07D31738

Type

Patent

Status

active

Patent number

054497914

Description

ABSTRACT:
A process is described for the catalytic preparation of propylene glycol carbonate (PGC) by reacting propylene oxide (POX) and CO.sub.2 in PGC as reaction medium at elevated temperature and elevated pressure and separating off from the catalyst the PGC formed. The process is carried out continuously under adiabatic temperature conditions. Per unit of time, PGC as reaction medium flows into the reactor at 7 to 350 times the amount of the PGC formed per unit of time. At all points of the reactor a CO.sub.2 excess is maintained over the other reaction partner POX. Of the effluent reaction mixture, 80 to 98% by weight are returned to the entrance of the reactor, while the remainder is worked up to give PGC. The sensible heat of the reaction product resulting from the adiabatic temperature conditions can be used for the work-up.

REFERENCES:
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patent: 4314945 (1982-02-01), McMullen et al.
patent: 4851570 (1989-07-01), Zaby et al.
patent: 5281723 (1994-01-01), Bantu et al.
patent: 5350862 (1994-09-01), Wagner et al.
Zaby et al, Chem. Abst. 112:78154d (1990).
Patent Abstracts of Japan, vol. 6, No. 197, 1982 and JP-A-57 106 631, Jul. 1982.
Chemie-Ingenieur-Techn., vol. 43, No. 16, Jan. 1971, pp. 903-905; "Athylenund Propylencarbonat", G. Hechler.
Fette-Seifen-Anstrichmittel, 1971, vol. 73, No. 6, pp. 396-399; "Die technishce Herstellung von Athylencarbonat", H. Springmann.

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