Purification of acetic acid

Details Purification of acetic acid Purification of acetic acid

C - Chemistry, Metallurgy

07

C

202/58, 260/534.

C07C 53/08 (2006.01) C07C 51/44 (2006.01) C07C 51/46 (2006.01)

Patent

CA 1060468

ABSTRACT OF THE DISCLOSURE 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 waster and methyl iodide, The crude acid is introduced into the upper half of a distillation zone. The methyl iodide, a major proportion of water ant 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 stop, The liquid water sidedraw may either be discarded or subjected to rectifica- tion for recovery of acid values,

267666

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