Process for producing acetic anhydride and acetic acid

Details Process for producing acetic anhydride and acetic acid Process for producing acetic anhydride and acetic acid

1995-03-22

1996-09-10

Geist, Gary

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

Organic compounds

Carboxylic acids and salts thereof

562608, 562577, 568484, 568492, 568487, 568491, C07C 5112, C07C 4549

Patent

active

055547907

ABSTRACT:
In a process for producing acetic anhydride and acetic acid by reacting methanol and methyl acetate, optionally together with dimethyl ether, with carbon monoxide, acetic anhydride and acetic acid are effectively produced with the use of a sequence of production facilities by carrying out separation of low-boiling point fraction mainly consisting of methyl iodide, methyl acetate and dimethyl ether with the use of at least two distillation zones, separating catalyst drops entrained from the vapor-liquid separation zone in at least one distillation zone and further by controlling the pressurization of the vapor-liquid separation zone and the above distillation zones under 5 bar to a pressure greater than atmospheric pressure. The invention not only reduces the facility cost and the energy cost to be borne for separation, but also improves the capability of recovering low-boiling point fractions and further recovers the entrained catalyst, so that acetic anhydride and acetic acid can efficiently be produced with the use of a sequence of production facilities.

REFERENCES:
patent: 5380929 (1995-01-01), Erpenbach et al.
Adv. Chem. Ser., 230, pp. 377-394 (1992).

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