Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1975-07-17
1977-09-13
Weinblatt, Mayer
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 42R, 252180, 252181, 252389A, 252 855E, 21 27R, 560 57, 560 60, 560 84, 560 91, 560180, 560181, 560182, 560190, 560198, C02B 506
Patent
active
040480658
ABSTRACT:
For inhibiting corrosion and scale on ferrous metal parts in a circulating water system there is added to the water in such system from 10 to 500 ppm of a partial ester of a polyfunctional acid having a free carboxylate, phosphonate or sulfonate group and another carboxyl group which is esterified with a polyoxyalkylated derivative of an alkyl, alkaryl, or alkenyl alcohol having a terminal hydrocarbon group of 8-20 carbon atoms. In some preferred embodiments there is added with the partial ester from 10 to 500 ppm of a dispersible enhancing agent which may also include a surface active agent for dispersing the agent in water. Preferred partial esters include partial esters of citric, malic, tartaric, maleic, adipic and phthalic acids partially esterified with an alkyl polyoxyethylene alcohol having 2 to 4 ethoxy groups.
REFERENCES:
patent: 2950310 (1960-08-01), Kirkpatrick
Begala, Jr. Arthur James
Grayson Martin
Suen Tzeng Jiueq
American Cyanamid Company
Hart Gordon L.
Weinblatt Mayer
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