Purification of acetic acid

Details Purification of acetic acid Purification of acetic acid

1975-12-11

1977-02-15

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Plural distillations performed on same material

Distillation of initial distillate

203 16, 203 98, 203 99, 203DIG19, 260541, B01D 314, C07C 5144

Patent

active

040081311

ABSTRACT:
A method is provided for removal of excess water which tends to build up in recycle streams and reduces the rate of pure acid production during operation of a distillation system for purification of crude acetic acid containing water and methyl iodide. The crude acid is introduced into the upper half of a distillation zone. The methyl iodide, a major proportion of water and an equivalent amount of acid are removed overhead from the zone. A minor proportion of the water containing a small amount of acetic acid is removed as a liquid sidedraw at a point near the top of the distillation zone. A product acid stream essentially dry and substantially free of methyl iodide is removed from the bottom of the distillation zone. The overhead stream can be stored, disposed of or preferably recycled to the acid-producing step. The liquid water sidedraw may either be discarded or subjected to rectification for recovery of acid values.

REFERENCES:
patent: 2412215 (1946-10-01), Guinot
patent: 2854385 (1958-09-01), Alheritiere
patent: 3073752 (1963-01-01), Mention
patent: 3210271 (1965-10-01), Byerly et al.
patent: 3769177 (1973-10-01), Eubanks et al.
patent: 3791935 (1974-02-01), Eubanks et al.

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