Dispersants and their use in aqueous coal suspensions

US5028238A · kind A · utility

Inventors

• Wolfgang von Rybinski · Goldkronach, DE
• Thomas Foerster · Goldkronach, DE

Key dates

• Filing date: Mar 11, 1988
• Grant date: Jul 2, 1991
• Expiry date: Mar 11, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S516/01
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Dispersants for aqueous coal suspensions containing PA0 (a) lignin sulfonic acid and/or alkali metal, alkaline earth metal and/or ammonium salts thereof, PA0 (b) one or more alkyl ether phosphates corresponding to general formulae (I) and/or (II) below ##STR1## in which R is straight-chain or branched C.sub.8 -C.sub.22 alkyl or alkenyl radical, PA1 M is hydrogen, an alkali metal, ammonium, or an alkaline earth metal, and PA1 m and n are numbers of from 1 to 15, and PA0 (c) optionally, other auxiliaries of the type typically present in such dispersants.