Purification of acetic acid streams by distillation

Details Purification of acetic acid streams by distillation Purification of acetic acid streams by distillation

1975-07-28

1977-06-14

Bernstein, Hiram H.

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

And returning product of distillation step to distillation zone

203 98, 260941, B01D 310, C07C 5308

Patent

active

040295532

ABSTRACT:
Acetic acid containing very minor amounts of iodine, either as I.sup.-, free iodine, or alkyl iodide, or all of these, is purified by fractionation in a single column with an acid product containing 20 parts or less of iodine per billion parts of acid (ppb) being withdrawn as a liquid sidedraw from said column. Generally, more than one column is required for obtaining an acid product of such extremely high purity. The process is particularly applicable for purification of acetic acid made by the carbonylation of methanol using a catalyst system formed on the mixing of a rhodium or iridium component and an iodine component notably hydrogen iodide or an alkyl iodide such as methyl iodide.

REFERENCES:
patent: 3769177 (1973-10-01), Eubanks
patent: 3772156 (1973-11-01), Johnson
patent: 3772380 (1973-11-01), Paulik
patent: 3791935 (1974-02-01), Eubanks

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