Antifoam based on oil-in-water emulsion

US4976888A · kind A · utility

Assignee

• BASF SE

Inventors

• Arnold De Clercq · Dirmstein, DE
• Wolfram Bergold · Heidelberg, DE
• Hans-Juergen Degen · Lorsch, DE
• Jaroslav Melzer · Ludwigshafen, DE

Key dates

• Filing date: Dec 30, 1988
• Grant date: Dec 11, 1990
• Expiry date: Dec 30, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D19/0404
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In antifoams based on oil-in-water emulsions, the oil phase of the emulsions contains PA1 (a) a C.sub.12 -C.sub.26 -alcohol, a distillation residue which is obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo process or by the Ziegler process and which may furthermore be oxyalkylated and/or PA1 (b) a fatty acid ester of a C.sub.12 -C.sub.22 -carboxylic acid with a monohydric to trihydric C.sub.1 -C.sub.18 -alcohol and, if required, PA1 (c) a hydrocarbon having a boiling point above 200.degree. C. or a fatty acid of 12 to 22 carbon atoms, accounts for from 5 to 50% by weight of the emulsion and has a mean particle size of less than 25 .mu.m, and from 5 to 50% by weight of components (a) and (b) of the oil phase are replaced by PA1 (d) one or more compounds which melt at above 70.degree. C. and are selected from the group consisting of the fatty alcohols of not less than 28 carbon atoms, the esters of a C.sub.1 -C.sub.22 -carboxylic acid with an alcohol of not less than 28 carbon atoms, the polyethylene waxes having a molecular weight of not less than 2,000, the carnauba waxes, the montan ester waxes and the montanic acid waxes and th…