Process for the preparation of dialkyl carbonates

Details Process for the preparation of dialkyl carbonates Process for the preparation of dialkyl carbonates

1992-07-08

1993-07-27

Ramsuer, Robert W.

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

Organic compounds

Carbonate esters

C07C 6800

Patent

active

052312135

ABSTRACT:
Dialkyl carbonates can be prepared by reaction of carbon monoxide with alkyl nitrites in continuous gas phase reaction, in which a platinum metal halide catalyst on aluminum oxides, aluminum oxide hydrates or aluminum hydroxides as support and, if desired, an additive comprising an antimony, bismuth, aluminum, copper, vanadium, niobium, tantalum, tin, iron, cobalt, nickel compound or a mixture of a plurality thereof on this catalyst are used and hydrogen halide is replaced during the course of the reaction batchwise or continuously in at least the amount which is discharged from the reactor together with the reaction mixture. This results in the formation of dialkyl carbonates in almost quantitative selectivity, while the corresponding dialkyl oxalates can not in most cases be detected. The abovementioned supports are characterized by a BET surface area of more than 1 m.sup.2 /g.

REFERENCES:
patent: 4318862 (1982-03-01), Romano et al.
patent: 5162563 (1992-11-01), Nichihira et al.
Jiang, Platinum Metal Review, vol. 34 (1990) pp. 178-180.

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