Effects of SDS and SDBS on CO2Hydrate Formation, Induction Time, Storage Capacity and Stability at 274.15 K and 5.0 MPa

Abstract

AbstractThe CO2 hydratetechnology is growing in relative to CO2 capture, storage and transportation processes. An experimental investigation on CO2 hydrate formation in case of SDS (Sodium dodecyl sulfate) and SDBS (Sodium dodecyl benzene sulfonate) with seven concentrationsi. e.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 g/L was conducted at temperature of 274.15 K and initial pressure of 5.0 MPa. It was found that SDS and SDBS surfactants havelittleinfluence on the total moles of gas consumed in the stirred reactor. The induction time of CO2hydrate formation was approximately 35 minsinboth of 0.5 g/L SDS and 0.3 g/L SDBS solution,while that was 50 minsin pure water. Although the surfactantsreduced the CO2hydrate induction time significantly, they did not show clear influence on the gas storage capacities. The maximum gas storage capacities of CO2 hydrate in pure water, SDS and SDBS aqueous solutions are 89.62, 92.67, 92.62 V/VH, respectively. The difference in decomposition time of CO2 hydrate formed in pure water, SDS and SDBS solutions indicates that SDS and SDBScan greatly enhance the stability of CO2 hydrate.