Process for drying hydrogen fluoride-carboxylic acid mixtures

Details Process for drying hydrogen fluoride-carboxylic acid mixtures Process for drying hydrogen fluoride-carboxylic acid mixtures

1988-12-06

1990-01-16

Gray, Bruce

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

Organic compounds

Oxygen containing

568 42, 568 43, 568 63, 568 64, 562490, 562494, 562606, 562608, 562609, C09C 4546

Patent

active

048944823

ABSTRACT:
A process is provided for removing water from a mixture of hydrogen fluoride (HF), a carboxylic acid, e.g., acetic acid, and water by extractive distillation in the presence of a Lewis base as solvent, which does not azeotrope with water, forms bonds with the HF and carboxylic acid which can be broken by heat and has a boiling point at atmospheric pressure at least about 20.degree. C. above that of the carboxylic acid, e.g., N-methyl-2-pyrrolidone, and taking off an overhead vapor comprising a major proportion of the water in said mixture. The extractive distillation may be advantageously integrated in an overall process with the production of an aromatic ketone, e.g., 4-hydroxyacetophone, by the Friedel-Crafts acylation of an aromatic compound, e.g., phenol, with the carboxylic acid, using HF as catalyst, to produce a product mixture comprising the aromatic ketone, HF, carboxylic acid and water, and the removal of aromatic ketone from the product mixture by means of a solvent assisted distillation.

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patent: 4607125 (1986-08-01), Mott
patent: 4663485 (1987-05-01), Murphy et al.
patent: 4692546 (1987-09-01), Davenport
Dann et al., Annalen der Chemie 587 Band, pp. 1 to 15 (1954) (English translation provided).
Simons et al., Journal of the American Chemical Society 61, 1795, and 1796 (1939).

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