Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-01-27
1979-12-04
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
521 32, C02B 160
Patent
active
041771400
ABSTRACT:
A method for removing a weak acid from an aqueous solution containing said acid is disclosed. The method comprises contacting said aqueous solution with an anion exchanger containing both strongly basic and weakly basic groups, said exchanger having a matrix comprising a copolymer of styrene and not more than about 20%, by weight, of a cross-linking agent, from about 3% to about 90% of the total basic groups being strongly basic groups of the quaternary ammonium type having the structure --CH.sub.2 N.sup.+ R.sub.1 R.sub.2 R.sub.3, wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of --CH.sub.3, --C.sub.2 H.sub.5, and --C.sub.2 H.sub.4 OH, and the balance of the basic groups being weakly basic groups of the tertiary amine type.
REFERENCES:
patent: 2503769 (1950-04-01), Roberts
patent: 2664441 (1953-12-01), Owens et al.
patent: 2840533 (1958-06-01), Hwa
patent: 3001868 (1961-09-01), Aveston et al.
patent: 3197401 (1965-07-01), Arai
Akzona Inc.
Cintins Ivars
Green Robert F.
Hart Charles N.
Young Francis W.
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