Gas hydrate formation in the presence of mixed surfactants and alumina nanoparticles

Abstract

Hydrate technology is of considerable significance for industrial natural gas storage and transportation. In this paper, the hydrate formation in surfactants with different ratios of alkyl glycosides (APG) and sodium dodecyl sulfate (SDS) was studied at 275.15 K and 7 MPa. The results show that when the APG content was 20%, the gas storage density reached 117.44 mol/mol indicating the best hydrate formation performance, and it can be further improved to 117.72 mol/mol after adding alumina. There was a secondary induction stage in hydrate formation when compounding. SDS accelerated gas by affecting the surface tension, and APG micelles could promote hydrate aggregation. The promotion effects of SDS and APG were superimposed. The hydrate was distributed in the hollow cylinder of the container. The larger the proportion of SDS, the closer the distance between the hydrate and the bottom.