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US 4,222,886 AGranted
Pumpable pipe cleaning composition
OwnerGeorge F. Connelly, Jr.inventor
Life of this patent
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Abstract
A pipe cleaning composition containing hydrochloric acid, at least one nitrogen-based inhibitor, a solubilizer for said inhibitor, a polysiloxane anti-foam agent and water, has a reduced tendency to attack copper or steel pipe.
Claims10
A composition for cleaning scale encrusted copper, steel or galvanized metal surfaces wherein said scale includes at least one alkaline earth metal carbonate, said composition consisting essential of:
- an aqueous solution of from about 7.5 to 25 percent by weight of hydrochloric acid,
- a corrosion inhibiting amount of an inhibitor system including from about 0.05 to 5.0 percent by weight (based on the weight of the aqueous acid solution) of an amine-based inhibitor which is the reaction product of an acetylenic alcohol with a primary or a secondary amine, said amine-based inhibitor including a solubilizer selected from the group consisting of polyoxylated mono and diamines having the formulae:
- ##STR3## wherein R is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms and x, y and z are integers, the sum of which is from 2 to 50, and;
- an effective amount of a polydimethylsiloxane anti-foam agent, said siloxane having a viscosity of about 100 centistokes at 25.degree. C.
1 more element
Dependencies are inferred from the claim text.