Separation process

摘要

A process for separating acetone, dichloromethane and trifluoroacetic acid from a mixture of acetone, dichloromethane, and a trifluoroacetic acid/acetone azeotrope by (1) fractionally distilling the mixture of acetone, dichloromethane, and the trifluoroacetic acid/acetone azeotrope; (2) fractionally distilling the mixture of the trifluoroacetic acid/acetone azeotrope and free acetone; (3) adding at least about 16 parts of water to the trifluoroacetic acid/acetone azeotrope per 100 parts by volume of the trifluoroacetic acid/acetone azeotrope; (4) fractionally distilling the mixture of free acetone and the water/trifluoroacetic acid azeotrope; (5) adding at least about 10 parts of sulfuric acid to the water/trifluoroacetic acid azeotrope per 100 parts by volume of the water/trifluoroacetic acid azeotrope; (6) fractionally distilling the mixture of trifluoroacetic acid and the water/sulfuric acid complex.