Process for working up aqueous electrolyte-containing suspensions of highly swellable layer silicates
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsWilli Wuest, Norbert Kuehne
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Abstract
A process for working up aqueous, electrolyte-containing suspensions of highly swellable layer silicates by which highly swellable layer silicates are isolated substantially free from electrolyte from an aqueous electrolyte-containing suspension in a reasonable time by multi-stage membrane filtration wherein the second and every following membrane stage, the concentrate is diluted, for example with fully deionized water, to maintain pumpability.
Claims11
A continuous multistage membrane filtration process comprising working up an aqueous electrolyte-containing suspension of highly swellable layer silicates by (1) passing said suspension through a membrane filtration stage to from a retentate composed of said concentrate wherein said concentrate contains said highly swellable layer silicate and a portion of said electrolyte, the remaining portion of said electrolyte being present in said permeate;
- (2) diluting said concentrate with completely deionized water to form a slurry, and (3) recycling said slurry to step (1) and (2) and continuing said recycling until an electrolyte-free layer silicate suspension is produced.
Dependencies are inferred from the claim text.