C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/54 (2006.01) B01D 17/05 (2006.01) B01D 21/01 (2006.01)
Patent
CA 2602652
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 aldehyde (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 dispersible 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.
Curran Thomas Peter
Deboo Steven M.
Kelly John Arthur
Minnis Ralph Lemmel
Mitchell David Brian
Betzdearborn Inc.
Borden Ladner Gervais Llp
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