Purification of acetic acid

Details Purification of acetic acid Purification of acetic acid

B - Operations, Transporting

01

D

202/86

B01D 3/00 (2006.01) B01D 3/14 (2006.01) C07C 51/44 (2006.01) C07C 51/487 (2006.01)

Patent

CA 1051817

APPLICATION FOR LETTERS PATENT FOR PURIFICATION OF ACETIC ACID ABSTRACT OF THE DISCLOSURE 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 pro- cess provides both for the recovery of the iodine components and the metha- nol 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 cata- lyst system formed on mixing of a rhodium or iridium component and an iodine component in the presence of carbon monoxide.

258850

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