Abstract: A process is described for converting wet acid into sodium tripolyphosphate by pretreating the wet acid in a pretreatment stage with a sodium source and SiO.sub.2 to precipitate fluoride values from the wet acid, solvent extracting the pretreated wet acid to remove further impurities, reacting the solvent extracted acid with a sodium source in a made up stage to form a sodium orthophosphate liquor, heating the resulting liquor in a calcining stage to produce sodium tripolyphosphate, passing gases from the calcining stage into a scrubber liquor to remove fluoride impurities and entrained sodium tripolyphosphate, recycling scrubber liquor to the make up stage to recover sodium tripolyphosphate values, and removing a bleed stream from the recycled scrubber liquor and recycling it to the pretreatment stage to remove fluoride impurities therein in the pretreatment stage.

Abstract: A process for separating the constituents of azeotropic mixtures of acetone and other lower ketones from lower halogenated hydrocarbons. Water is added to the azeotropic mixture of acetone and the lower halogenated hydrocarbon for breaking up of the azeotrope, and the halogenated halohydrocarbon is distilled off.