Process for purifying 4-hydroxyacetophenone

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

1986-07-22

1987-05-05

Reamer, James H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568324, 423484, C07C 4584

Patent

active

046634851

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.

REFERENCES:
patent: 2414418 (1947-01-01), Lofton
patent: 3403183 (1968-09-01), Dobraty et al.
patent: 3806588 (1974-04-01), Hann
patent: 4433173 (1984-02-01), Gupta et al.
patent: 4593125 (1986-06-01), Davenport et al.
patent: 4607125 (1986-08-01), Mott

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