Process for preparing highly concentrated aqueous press...

Details Process for preparing highly concentrated aqueous press... Process for preparing highly concentrated aqueous press...

C - Chemistry, Metallurgy

09

B

8/48, 134/54

C09B 67/54 (2006.01) B01D 37/03 (2006.01)

Patent

CA 1258024

Abstract of the disclosure: 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 aque- ous 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 pig- ments 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 proceed via the indirect route of drying to obtain the powders and redispersing the powders. By using the process according to the invention it is possible to cut out the costly indirect route or, if desired, to reduce the expense of drying to obtain powders by an appreciable margin.

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