Process for the preparation of dialkyl carbonates

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

C - Chemistry, Metallurgy

07

C

C07C 69/96 (2006.01) C07C 68/00 (2006.01)

Patent

CA 2080745

Process for the preparation of dialkyl carbonates Abstract Dialkyl carbonates can be prepared by reaction of carbon monoxide with alkyl nitrites in a continuous gas phase reaction, in which a platinum metal catalyst of oxidic or hydroxidic compounds of elements from group Vb of the Periodic Table (Mendeleev) as supports and, if desired, addition of an antimony, bismuth, aluminium, copper, vanadium, niobium, tantalum, tin, iron, cobalt, nickel compound or a mixture of a plurality thereof on this catalyst are used, and the hydrogen halide which is discharged from the reactor together with the reaction mixture is batchwise or continuously replaced in the course of the reaction. This results in the formation of dialkyl carbonates in almost quantitative selectivity; the corresponding dialkyl oxalates can, in most cases, not be detected. Le A 28 672-US

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