Patent ID: 8980798
Filing Date: 2015-03-17
Classification: C08L,C09K

Abstract:
1. A method for inhibiting the precipitation of a polymeric kinetic hydrate inhibitor (KHI) from an aqueous composition containing water and at least one polymeric KHI comprising contacting the aqueous composition with a water immiscible solvent having a polarity index greater than about 3 in an amount effective to inhibit the precipitation of the polymeric KHI, where the polymeric KHI is selected from the group consisting of polyvinylcaprolactam, polyvinylpyrrolidone, poly(vinylcaprolactam-co-vinylpyrrolidone), polyisopropylmethacrylamide, poly(N-vinyl-N-methylacetamide) (VIMA), poly(VIMA:vinylcaprolactam) copolymer, poly(isobutylacrylamide), hydroxyethyl cellulose and its derivatives, and mixtures thereof, and the water immiscible solvent is selected from the group consisting of kerosene, mineral spirits, trimethylbenzene, cumene, ethylbenzene, polyethylbenzene, naphthalene, and mixtures thereof, where the amount of water immiscible solvent ranges up to about 5 vol % of the water in the aqueous composition.