Method for the production of waterfree and dustfree anionic surfactants

US6288021A · kind A · utility

Assignee

• Cognis Deutschland GmbH · DE

Inventors

• Thomas Lueder · Langenfeld, DE
• Bernd Fabry · Korschenbroich, DE
• Joerg Kahre · Monheim, DE
• Werner Seipel · Hilden, DE

Key dates

• Filing date: Mar 19, 1999
• Grant date: Sep 11, 2001
• Expiry date: Mar 19, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D1/662
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A process for making substantially water- and dust-free anionic surfactant granules of high bulk density involving: (a) providing a starting material containing a water-containing paste of a monoglyceride (ether) sulfate having a solids content of at least 20% by weight, based on the weight of the paste; (b) providing a horizontally mounted thin-layer evaporator with rotating internals; (c) providing a negative temperature gradient within the evaporator; (d) passing air into the evaporator in countercurrent to the flow of starting material; and (e) simultaneously drying and granulating the starting material by passing it through the evaporator to form anionic surfactant granules having a residual water content of below 2% by weight.