Process for working up aqueous electrolyte-containing suspensions of highly swellable layer silicates

US4908133A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Willi Wuest · Ratingen, DE
• Norbert Kuehne · Haan, DE

Key dates

• Filing date: Apr 26, 1989
• Grant date: Mar 13, 1990
• Expiry date: Apr 26, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B33/405
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.