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Inhibition of gas hydrate formation, useful in transport in petroleum and natural gas industry and in drilling mud, uses polymer with vinyl alcohol, vinyl or allyl ester and optionally acetal and/or other units
Inhibition of gas hydrate formation, useful in transport in petroleum and natural gas industry and in drilling mud, uses polymer with vinyl alcohol, vinyl or allyl ester and optionally acetal and/or other units
Use of 0.01-2 wt.% polymer as gas hydrate inhibitor is claimed, in which the polymer has a number average molecular weight Mn of 1000-1000000 g/mole and consists of (a) 1-70 mole-% vinyl alcohol units, (b) 30-99 mole-% vinyl or allyl ester units, (c) 0-69 mole-% acetal units and (d) 0-30 mole-% units derived from olefinically unsaturated, 2-18 carbon (C) compounds, which may contain 1-100 alkoxy groups and/or nitrogen (N) or sulfur (S) atoms. Use of 0.01-2 wt.% polymer as gas hydrate inhibitor is claimed, in which the polymer has a number average molecular weight Mn of 000-1000000 g/mole and consists of (a) 1-70 mole-% vinyl alcohol units of formula (I), (b) 30-99 mole-% vinyl or allyl ester units of formula (II), (c) 0-69 mole-% acetal units of formula (III) and (d) 0-30 mole-% units derived from olefinically unsaturated, 2-18 carbon (C) compounds, which may contain 1-100 alkoxy groups and/or nitrogen (N) or sulfur (S) atoms: R1 = 1-6 C alkyl; R2, R3 = H, COOH, 1-10 C alkyl or 6-12 C aryl, in which the alkyl and aryl groups may have carboxyl, hydroxy, sulfo or halogen substituent(s); R4 = H or methyl Independent claims are also included for; (1) Gas hydrate inhibitor containing the above polymer; (2) Inhibition of gas hydrate formation by adding the polymer to an aqueous phase in contact with a gaseous, liquid or solid organic phase.
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