Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Patent
1975-08-11
1977-08-02
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
203 16, 203 66, 203 81, 203DIG19, 260541, C07C 5308, B01D 334
Patent
active
040393950
ABSTRACT:
A process is provided for purification and drying of acetic acid containing water and methyl iodide and hydrogen iodide as contaminants. The process comprises distillation in a two-zone system wherein the major part of the methyl iodide and hydrogen iodide and some water are removed as overhead and bottoms, respectively, from the first zone; a stream from the middle section of the first zone is introduced into a second zone into which there is also introduced a stream of methanol; and a stream of dry purified acid is recovered from the bottom of said second zone. The process provides both for the recovery of the iodine components and the methanol added for re-use in production of additional acetic acid by the reaction of methanol and/or methyl acetate with carbon monoxide in contact with a catalyst system formed on mixing of a rhodium or iridium component and an iodine component in the presence of carbon monoxide.
REFERENCES:
patent: 2433323 (1947-12-01), Reiter et al.
patent: 3394058 (1968-07-01), Hohenschutz
patent: 3769177 (1973-10-01), Eubanks et al.
patent: 3772156 (1973-11-01), Johnson et al.
patent: 3791935 (1974-02-01), Eubanks et al.
Bascomb, Jr. Wilbur L.
Monsanto Company
Sporar Elizabeth F.
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