C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/48 (2006.01) C07C 51/42 (2006.01) C07C 63/26 (2006.01)
Patent
CA 2042409
A method for removing impurities from an oxidative terephthalic acid synthesis mother liquor containing acetic acid, water, corrosion metals, a metal catalyst and organic im- puritites, comprising the steps of (a) removing from the moth- er liquor by evaporation from 50-95 % of the acetic acid and water contained therein; (b) adding an amount of water to the concentrated mother liquor sufficient to dissolve the metal catalyst and form an aqueous mixture; (c) extracting the aqueous mixture by counter- current extraction with a sub- stantially water-insoluble or- ganic solvent, to produce a lighter phase containing the or- ganic solvent a minor amount of the water, acetic acid and the organic impurities and a heavier phase containing a ma- jor amount of the water, corrosion metals and the metal catalyst, and; (d) removing the corrosion metals from the heavier phase by heating and filtering, and; (e) removing the organic impurities from the lighter phase by distillation.
Browder Larry Wayne
Medlin James Curtis
Spaugh Art Thaler Jr.
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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