“Hydrate equilibrium data for CO2+N2 mixtures with pressure reduction chemicals”
Abstract
Carbon Dioxide capture and sequestration (CCS) is nowadays an important area of research for alleviating CO2 emissions worldwide. Hydrates can become of great importance as they form the basis for a new technology that concerns CO2 capture from flue gases (hydrate crystallization). In this work hydrate equilibrium data measured at the Centre Thermodynamic of Processes in MINES ParisTech (France) are presented as part of a collaborative project funded by the Danish Technical Research Council.
In this study experimental results for hydrate dissociation with several promoters are presented. The isochoric method is used to determine the gas hydrate dissociation points. Different CO2+N2 gas mixtures were used with presence of promoters such as tetra-butylammonium bromide (TBAB), tetra-butylammonium fluoride (TBAF), cyclopentane (CP) and mixtures of TBAB and TBAF with CP. The combination of TBA halides with CP was inspired by [1] as it came out synergetic effect that enhances promotion between TBAB (5 wt %) and CP (5 vol %) in CO2/H2 (38.6/61.4) gas mixture. The results have shown clearly synergetic effect for 20% w/w TBAB+CP (5 vol %) in CO2/N2 (6.87/93.13) gas mixture. Moreover, experimental uncertainties for temperature, pressure, and molar composition are also presented.
Reference
[1] Li X.-S., Xia Z.-M., Chen Z.-Y., Wu H.-J., Energy Fuels, 2011, 25, 1302–1309.