Process for purifying 4-hydroxyacetophenone

Details Process for purifying 4-hydroxyacetophenone Process for purifying 4-hydroxyacetophenone

C - Chemistry, Metallurgy

07

C

260/588, 202/72,

C07C 45/84 (2006.01) C07C 45/46 (2006.01) C07C 45/54 (2006.01) C07C 45/83 (2006.01) C07C 49/825 (2006.01)

Patent

CA 1276181

Abstract A process is provided for the distillation of a composition containing 4-hydroxyacetophenone and hydrogen fluoride in the presence of an alkane assisting solvent having from 4 to 16 carbon atoms e.g. n-hexane or n-octane. The process is carried out to obtain an overhead vapor containing alkane solvent and most of the hydrogen fluoride in the feed, and a liquid residue containing most of the 4-hydroxyacetophenone in the feed. The overhead vapor is condensed to form two immiscible phases, one containing a preponderance of hydrogen fluoride and the other a preponderance of alkane solvent, with the latter phase being returned to the distillation as reflux. The liquid residue also separates into two immiscible layers, one containing most of the 4-hydroxyacetophenone in the feed which is recovered and the other a preponderance of alkane solvent.

542565

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