HYDRATE INHIBITION

摘要

A hydrate inhibitor comprising a blend of an additive (i) and at least one of an additive (ii) and an additive (iii) wherein additive (i) is a polymer of an ethylenically unsaturated N-heterocyclic carbonyl compound, with 6-8 ring atoms in the heterocyclic ring, additive (ii) is a corrosion inhibitor and additive (iii) is a salt of formula (I): [R<1>(R<2>)XR<3>]<+>Y<-> 1/v, I wherein each of R<1>, R<2> and R<3> is bonded directly to X, each of R<1> and R<2>, which may be the same or different is an alkyl group of at least 4 carbons, X is S, NR<4> or PR<4>, wherein each of R<3> and R<4> which may be the same or different represents hydrogen or an organic group, with the proviso that at least one of R<3> and R<4> is an organic group of at least 4 carbons, especially at least 5 carbons, and Y is an anion of valency v, wherein v is an integer of 1-4.