Kinetic study on CO2/H2 hydrate formation with 13X molecular sieve coupled TBAB

As an emerging CO2 capture technology, hydrate method has been widely accepted as a research focus owing to the environmental protective characteristic and simplified approach. However, a group of key issues involving slow formation rate and low gas storage caused by the relatively low speed of gas-liquid transfer remain to be solved. Based on the characteristics of 13X molecular sieve coupling TBAB promoter at 279.15-280.65K and 3.0-6.0MPa, the study explored the pressure drop curve and gas uptake in the formation process of CO2/H2 hydrate (39.8% CO2/60.2% H2). Furthermore, this study analyzed the impact of TBAB concentration and experimental pressure on its promotion effect and compare with the other research respectively. The outcome of this study indicated that compared with the hydrate formation process in TBAB solution by agitation, 13X molecular sieve coupled TBAB can significantly enhance the rate of pressure drop and the gas uptake of CO2/H2 hydrate. Nevertheless, with the increase of TBAB solution concentration, gas uptake climb to the peak first and then decreased at 279.15K and 3.0MPa. And the gas uptake follow the similar regular pattern with the increase of TBAB solution concentration at 280.65K and 3.0MPa. Additionally, the impact of 13X molecular sieve coupling TBAB promoter on the rate of pressure drop and the consumption of gas of CO2/H2 hydrate increased with the increase of experimental pressure. © 2019, Chemical Industry Press. All right reserved.