Compositions – Preservative agents – Anti-corrosion
Patent
1997-08-04
1998-12-01
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
252331, 252344, 210708, B01D 1704, C02F 156
Patent
active
058433376
ABSTRACT:
There is provided a composition comprising tannin containing hydroxyl groups which has been (a) chemically modified by reaction of at least one of said hydroxyl groups with at least one member selected from the group consisting of an esterification agent (e.g. acetic anhydride), etherification agent (e.g. dichloromethane or quaternary organic amine such as N-(3-chloro-2-hydroxypropyl) trimethyl ammonium chloride) to form the corresponding ester, or ether, through said hydroxyl group, and (b) derivatized. The chemically modified tannin is derivatized by reaction with aldehyhde (e.g. formaldehyde), or aldehyde and at least one member selected from the group consisting of ammonia and organic amine containing at least one primary or secondary nitrogen (e.g. cyclohexyl amine); said derivatized tannin being water soluble or dispersable at a pH below 7 and water insoluble at a pH above 7.
The above modified tannins are useful for the coagulation and/or detackification of solid particles suspended in an aqueous system, such as paint particles suspended in the waste water of a paint spray booth operation. Such tannins also have utility for demulsifying oil-in-water emulsions.
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Curran Thomas Peter
Deboo Steven M
Kelly John Arthur
Minnis Ralph Lemmel
Mitchell David Brian
BetzDearborn Inc.
Lovering Richard D.
Metzmaier Daniel S.
Ricci Alexander D.
Von Neida Philip H.
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