Experiments on the effect of non-ionic surfactant sorbitan monododecanoate(Span 20)on induction time
formation rate and gas storage density were conducted during methane hydrate formation in a high pressure reactor with a magnetic stir at(274.15±0.10)K
(8.30±0.10)MPa and 0-3%. The results show that the induction time with 0.2% Span 20 was shortest
53-167 minutes and a maximum formation rate was obtained with 0.4% Span 20
about 10 times the rate of pure water. Moreover
at 0.4% Span 20 also had the largest gas storage density of 145.2. On the basis of analysis on the Span 20 structure
the mechanism of surfactants promoting methane hydrate formation was investigated. It appears that the induction effect of tetrahydrofuranoid with two hydroxyls together with the template effect of the false hexahydroxy cycle may promote methane hydrate formation.
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references
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