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

B - Operations, Transporting

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202/69, 260/579.

B01D 3/40 (2006.01) C01B 7/19 (2006.01) C07C 45/46 (2006.01) C07C 45/83 (2006.01) C07C 49/825 (2006.01) C07C 51/44 (2006.01)

Patent

CA 2003924

ABSTRACT OF THE DISCLOSURE 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°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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