Process for producing carbonic acid diester

Details Process for producing carbonic acid diester Process for producing carbonic acid diester

1997-04-16

1998-07-14

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

55220, 95236, 252189, 422129, 558260, 558270, 558274, 558277, C07C 6800

Patent

active

057806632

ABSTRACT:
A process for producing a carbonic acid diester, a method of removing CO.sub.2 and an absorbent for CO.sub.2 and an apparatus therefor are provided and are capable of selective removing of CO.sub.2 by absorption from a CO-containing gas admixed with CO.sub.2 which is recovered from a reactor to thereby enable recycling CO to the reactor for use. The invention is characterized by (1) carrying out a reaction of an alcohol, carbon monoxide (CO) and oxygen in a reactor and withdrawing a gas (i) which contains CO and CO.sub.2 produced as a by-product of the reaction from the reactor; (2) contacting the withdrawn gas (i) with an alcohol solution so that at least part of the CO.sub.2 contained in the gas (i) is absorbed by the alcohol solution and removed from the gas (i), thereby obtaining a CO-containing gas (ii), and (3) recycling the CO-containing gas (ii) to the reactor. It is preferred that the gas (i) is subjected to vapor-liquid separation and a separated gas is contacted with the alcohol solution.

REFERENCES:
patent: 3653810 (1972-04-01), Bratzler et al.
patent: 5274163 (1993-12-01), Rechner et al.
patent: 5527943 (1996-06-01), Rivetti et al.
patent: 5599965 (1997-02-01), Kricsfalussy et al.
Database CAPLUS on STN.RTM., Chemical Abstracts Service, (Columbus, Ohio), Accession No. 1996:519632; Halat, A. et al., Pr. Nauk. Inst. Technol. Nieorg. Nawazow Miner. Politech. Wroclaw. 43, 17-29, (1995), abstract, 1996.

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