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EFFECT OF THREE DIFFERENT METAL POWDERS ON THE PHASE BEHAVIOR OF CH4 AND CO2 HYDRATES: FESI3, INCONEL 718 AND CUSN12
Abstract
To better investigate the effect of additives on the hydrate phase behavior and to enrich the hydrate phase equilibrium data in the presence of metal compounds. Hydrate experiments were carried out in the existence of a pure quartz porous medium impregnated with a metallic powder made of 200 g FeSi3, Inconel 718 and CuSn12 alloy, respectively. Results were obtained the entire process of methane and carbon dioxide hydrate formation and decomposition in all cases. In this 949 cm3 lab-scale reactor, metallic powders accelerated the kinetic process of hydrate formation due to high thermal conductivity. FeSi3 had a better inhibitor effect on carbon dioxide hydrate than methane hydrate. Whereas, CuSn12 worked as the promoter to CH4 and CO2 hydrates, lowering hydrate formation conditions. Inconel could used effectively to increase the efficiency of CO2/CH4 mixture separation by hydrate formation This study would be helpful for future studies of the thermodynamic conditions of hydrates in metal-bearing sediments and for subsequent studies of the replacement of methane in hydrates by carbon dioxide.
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