Process for preparing highly concentrated aqueous press cakes of solids

Abstract From the Canadian patent

Process for preparing highly concentrated aqueous press cakes of solids, According to the invention addition of one or more sur-, factants having a cloud point in aqueous solution to an aqueous suspension of a solid gives after the isolation of the solid at a temperature above the cloud point aqueous press cakes containing a large amount of this solid. The direct processing of press cakes as obtained for example after the synthesis and isolation of dyes or pigments to give practical aqueous pastes or dispersions requires a minimum solids content in the press cakes. The minimum content is frequently not obtained when conventional methods of isolation are used so that it is, necessary to …