Patent ID: 8921478
Filing Date: 2014-12-30
Classification: C08F,C09K,C10L

Abstract:
1. A method of inhibiting hydrate formation in a fluid comprising water, gas and optionally liquid hydrocarbon comprising treating the fluid with an effective hydrate-inhibiting amount of an inhibitor composition comprising a cationic copolymer derived by polymerization of about 91.3 to about 85.5 mole percent of N-isopropyl methacrylamide monomer units and about 8.7 to about 14.5 mole percent of methacrylamidopropyltrimethylammonium chloride monomer units, wherein polymerization of said cationic copolymer is initiated by redox decomposition of a peroxide with a redox co-catalyst, and wherein said cationic copolymer has a molecular weight distribution of about 60-100 percent in the range of 1,000 to 20,000 Daltons and 0-25 percent in the range from 20,000 to 6,000,000 Daltons.