Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1994-12-22
1996-08-27
McCarthy, Neil
Liquid purification or separation
Processes
Ion exchange or selective sorption
210712, 210729, 210735, 210736, C02F 156
Patent
active
055498329
ABSTRACT:
A process and apparatus for the treatment and recovery of spent vehicle coolant that involves the following steps:
a) removing the spent coolant from the engine;
b) treating the spent coolant with sodium dimethyldithiocarbamate to cause dissolved metals therein to form insoluble particles;
c) treating the spent coolant of step b) with an aqueous basic coagulating agent such as a polyquaternary ammonium compound in its hydroxide form;
d) filtering the spent coolant from step c) through a set of filters and then through a bed of carbon particles, to produce a relatively cleaner liquid; and
e) adding to the relatively clear liquid a combination of corrosion inhibitors, buffering agents and alkali, whereby the treated coolant can be recycled to the vehicle for effective coolant performance therein.
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Chandler Thomas D.
Dea William S.
Ische Kenneth W.
Johnson Michael W.
Century Manufacturing Company
McCarthy Neil
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