Abstract
The phase equilibrium data of hydrate formation in tetrahydrothiophene (THT) and different gasses including CH4, H2, CO2, and IGCC syngas(40 mol% CO2/60 mol% H2) were measured in this work. The results show that the addition of THT remarkably reduces the CH4, H2, CO2, and IGCC syngas hydrate formation conditions. Besides, for H2, CO2, and IGCC syngas, THT's effect in reducing hydrate formation conditions is slightly less than that in the system containing CP or 5.6 mol% THF. However, for the CH4 gas, the hydrate formation conditions curve obtained from the system containing THT, 5.6 mol% THF and CP are almost similar. In addition, since THT is a water-insoluble promoter, the results proved that its molar fractions can not affect the hydrate formation conditions. Based on the phase equilibrium data we obtained, the dissociation enthalpies of hydrate formation in these systems were also determined via the Clausius-Clapeyron equation and its modified style. The hydrate dissociation enthalpies for THT + CH4, THT + H2, THT + CO2, and THT + IGCC syngas are within 102.2 - 115.26 kJ•mol−1, 312.01 - 315.94 kJ•mol−1, 149.93–213.40 kJ•mol−1 and 160.19 - 181.02 kJ•mol−1, respectively.
Published Version
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