Corrosion and scale inhibitors for industrial recirculating cooling water systems
AssigneeAmerican Cyanamid Company
InventorsTzeng Jiueq Suen, Arthur James Begala, Jr.
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Abstract
Disclosed is a chemical composition and a process for inhibiting corrosion and scaling on metal surfaces in industrial cooling water systems. The process includes the addition to the cooling water of from 10 to 200 ppm of an alkyl polyethoxy compound having a free carboxylate, sulfonate or phosphonate group. In some preferred embodiments, 10 to 500 ppm of a mineral oil is added to the water system, in addition to the polyethoxy compound.
Claims13
A process for inhibiting corrosion and scaling on metal surfaces in water systems comprising:
- adding to water in said systems of from 10 to 200 ppm of additive selected from compounds having the general formula:
- R(OCH.sub.2 CH.sub.2).sub.m O(CH.sub.2).sub.x CHR'--Z'
- wherein:
- R is a hydrocarbon radical of 8 - 22 atoms;
- m is an integer of 1 - 6;
- x is 0 or 1;
- R' is Hydrogen or methyl;
- and
- Z' is COOM, SO.sub.3 M or PO(OM).sub.2 -- where M is H or an alkali metal.
An additive composition for inhibiting corrosion and scale on metal parts of a water system, said composition consisting essentially of a polyethoxy compound having the general formula:
- R(OCH.sub.2 CH.sub.2).sub.m O(OH.sub.2).sub.x CHR'--Z'
- wherein:
- R is a hydrocarbon radical of 8 - 22 carbon atoms;
- m is an integer of 1 - 6
- x is 0 or 1;
- R' is Hydrogen or methyl;
- and
- Z' is COOM, SO.sub.3 M or PO(OM).sub.2 -- where M is H or an alkali metal;
- and a hydrocarbon oil that is dispersible in water with said polyethoxy compound.
Dependencies are inferred from the claim text.