PURPOSE: To symultaneously or selectively obtain acetic acid, methyl acetate and acetic anhydryde, by carbonylating methanol in a gas phase under the specified condition to prepare acetic acid and methyl acetate and afterthat preparing acetic anhydride from the residue of methyl acetate.
CONSTITUTION: First, methanol is carbonylated in the gas phase in a carbonylation reactor, in the presence of a co-catalyst comprising a rhodium catalyst and a halide, using carbon monoxide or/and the gaseous mixture composed of carbon monoxide and hydrogen (wherein 1-50% hydrogen is mixed), in a molar ratio of the gas : methanol of (1:0.1) to (1:100), at 100-400°C under a partial pressure of carbon monoxide of from atm. pressure to 1,000 psig to obtain the objective acetic acid and methyl acetate, and after a specified amount of acetic acid and methyl acetate is recovered, the residue of methyl acetate is carbonylated with carbon monoxide or the gaseous mixture composed of carbon monoxide and hydrogen, in a GHSV(Gas Hourly Space Velocity) of 50-10,000 Hr-1 at 100-400°C to prepare and recover the objective acetic anhydride. Further the co-catalyst is recycled to use.
KAN SEIKAN
GO SHIYUNU
SHIYU GOSHIN
| JPS473331A | ||||
| JPS523926A | 1977-01-12 | |||
| JPH04257538A | 1992-09-11 | |||
| JPS6369719A | 1988-03-29 |
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