نمایش همه 4 نتیجه
Hydrate Based Gas Separation Technology in Low Dose of Porous Media
This paper studied tرایگان!
This paper studied the gas separation and purification utilizing hydrate based gas separation (HBGS). The effect of nano porous media in split fractionation and the influencing of the composition of the feed gas were considered. Gas hydrate formation of ternary CH4/C2H6/C3H8 mixture were carried out in the fixed amount of water in the presence of nanostructure silica based material with the mass ratio of 5%. In this way, three different gas compositions were used as initial feed. After hydrate formation, the gas phase in equilibrium with the hydrate was used as a new feed for the next step of hydrate formation. The presence of porous media improved selectivity in methane purification. The continuous stepwise HBGS showed a good efficiency in selective gas separation. The change in the concentration of methane is significant specially when the amount of methane in the gas feeds are lower. Such an effect brought about by low dose of porous material can be utilized in the methane purification by HBGS. HWHYD software was applied to predict the equilibrium condition. Comparison of the equilibrium conditions in bulk system show the transfer of hydrate equilibrium curve to higher pressure and lower temperature due to the change in gas composition
Kinetic investigation of methane hydrate in the presence of Imidazolium Based Ionic Liquid solutions
Methane hydrate formرایگان!
Methane hydrate formation experiments in the presence of the various imidazolilium based ionic liquid solutions with 0.5wt% concentration including 1-buthyl-3-methylimidazolium methyl sulfate ([BMIM][MeSO4]) , 1-ethyl-3-methylimidazolium hydrogen sulfate ([EMIM][HSO4]), 1- ethyl-3-methylimidazolium ethyl sulfate ([EMIM][EtSO4]), 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) and 1-(2- hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([OH-EMIM][BF4]) were conducted in a high pressure reactor at the same temperature. The induction time, gas consumption and temperature were measured.The results of experiments were indicated that [EMIM][EtSO4] and [BMIM][MeSO4] had the kinetic inhibiton effects meanwhile the other ionic liquids could be able to apply as the kinetic promoters
Phase equilibrium measurements for hydrates of the CH4 /CO2 / 1, 4-Dioxane aqueous solution system
The equilibrium compرایگان!
The equilibrium compositions and properties of CO2/CH4/1,4-dioxane/water hydrate were studied for the first time at temperatures ranging from 273.65 to 281.35K and pressures ranging from 0.5 to 1.1MPa. The gas mixture consist of about 45% CO2 was used to be an exemplary for biogas and landfill gas operations. Equilibrium hydrate formation conditions for above system were measured. 1,4-Dioxane lowered equilibrium pressure by 2MPa comparing with pure water at some temperatures. This is an indication that structural transition from SI to SII was occurred
Prediction of methane hydrate equilibrium pressurs in the presence of aqueous Imidazolium-based ionic liquid solutions using Electrolyte Cubic Square Well Equation of State
Electrolyte Cubic Sqرایگان!
Electrolyte Cubic Square-Well Equation of State, eCSW EoS, based upon the Helmholtz free energy consists of the one non-electrolyte term and the two electrolyte terms. The non-electrolyte term is cubic square-well equation of state (CSW EoS) and the two electrolyte contributions consist of a Born energy and the mean spherical approximation terms. In this work, eCSW EoS is coupled with the van der Waals-Platteuw model and applied to predict the hydrate dissociation pressures of the methane+ ionic liquid+ water systems. Ferthermore, the adjustable paramers of the imidazolium based ionic liquid solutions calculated by using experimental data in litreture.A good agreement between the results of the model with the experimental data indicates the reliability of this model to predict the hydrate equilibrium conditions