Process for continuously producing dimethyl carbonate

Details Process for continuously producing dimethyl carbonate Process for continuously producing dimethyl carbonate

1994-11-28

1996-07-09

Dees, Jose G.

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

Organic compounds

Carbonate esters

558260, 558488, C07C 6996

Patent

active

055346480

ABSTRACT:
A process for producing dimethyl carbonate is carried out by a first step of catalytically reacting carbon monoxide with methyl nitrite to produce dimethyl carbonate; a second step of absorbing dimethyl carbonate contained in a gas fraction withdrawn from the first step by dimethyl oxalate; a third step of regenerating methyl nitrite by contacting nitrogen monoxide contained in a gas fraction withdrawn from the second step with a molecular oxygen-containing gas and methyl alcohol; a fourth step of collecting dimethyl carbonate by distilling a liquid fraction withdrawn from the second step; and a fifth step of producing and recovering methyl nitrite from a purge gas consisting of a minor portion of a gas fraction withdrawn from one of the second step and the third step by bringing the purge gas together with an ammonia-oxidation product gas into contact with methyl alcohol in a methyl nitrite-recovering column, to thereby produce and recover methyl nitrite contained in the recovering column with a high efficiency at a high level of safety.

REFERENCES:
patent: 4353843 (1982-10-01), Doumaux, Jr. et al.
patent: 4879401 (1989-11-01), Doumaux, Jr. et al.
patent: 5162563 (1992-11-01), Nishihira et al.
patent: 5214185 (1993-05-01), Nishihira et al.

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