scholarly journals CH4Separation from Coal Bed Methane by Hydrate in the SDS and THF Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Jianzhong Zhao ◽  
Yangsheng Zhao ◽  
Weiguo Liang
Keyword(s):  
Gas Separation ◽  
Separation Efficiency ◽  
Hydrate Formation ◽  
Separation Process ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Gas Mixture ◽  
Methane Gas ◽  
Temperature And Pressure ◽  
Better Than

Hydrate-based separation experiments on simulate coal bed methane gas have been conducted in THF solution and SDS solution. In this work, a novel hydrate-based gas separation process was used to enhance CH4separation from a 65.7% CH4/20.2% N2/O2gas mixture in the presence of 300 ppm SDS and 19% THF solution. The characteristics of the CH4separation efficiency, fluctuation of temperature, and pressure were studied at different promoter solution. It was found that hydrate formation was induced by promoter in the solution and occurred immediately as the experiments were started. THF performed better than SDS for CH4separation from the CH4/N2/O2gas mixture. In particular, the separation coefficients of CH4and N2were compared in two solutions. The gas mixture S.Fr. or CH4recovery is increased from 1.056 to 1.259 while SF of N2is decreased from 1.183 to 0.634 in THF solution.

Illustration of Hydrate-Based Methane Gas Separation in Coal Bed Methane Type Gas Composition at Lower Pressures

2018 ◽  
Vol 114 (03) ◽  
pp. 661 ◽  
Author(s):  
Burla Sai Kiran ◽  
Kandadai Sowjanya ◽  
V. V. Eswari ◽  
Pinnelli S. R. Prasad
Keyword(s):  
Gas Separation ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Gas Composition ◽  
Methane Gas

scholarly journals Comparative Study of Tetra-N-Butyl Ammonium Bromide and Cyclopentane on the Methane Hydrate Formation and Dissociation

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6518
Author(s):  
Warintip Chanakro ◽  
Chutikan Jaikwang ◽  
Katipot Inkong ◽  
Santi Kulprathipanja ◽  
Pramoch Rangsunvigit
Keyword(s):  
Comparative Study ◽  
Induction Time ◽  
Methane Hydrate ◽  
Mass Fraction ◽  
Hydrate Formation ◽  
Ammonium Bromide ◽  
Methane Recovery ◽  
Methane Gas ◽  
Methane Uptake ◽  
Better Than

Two widely investigated methane hydrate promoters, tetra-n-butyl ammonium bromide (TBAB) and cyclopentane (CP), for methane hydrate formation and dissociation were comparatively investigated in the quiescent reactor at 2.5 °C and 8 MPa. The results indicated that the increase in the mass fraction TBAB decreased the induction time. However, it did not significantly affect the methane uptake. In the presence of CP, the increase in the CP concentration resulted in an increase in the induction time due to the increasing thicknesses of the CP layer in the unstirred reactor. Moreover, the methane uptake was varied proportionally with the CP concentration. The addition of TBAB resulted in a higher methane uptake than that of CP, since the presence of TBAB provided the cavities in the hydrate structure to accommodate the methane gas during the hydrate formation better than that of CP. On the contrary, the presence of CP significantly increased the induction time. Although the methane recovery remained relatively the same regardless of TBAB and CP concentrations, the recovery was higher in the presence of TBAB.

Incipient Hydrate Formation Pressure-Temperature and Equilibrium Composition for CH4-N2-O2-THF-H2O System

2011 ◽  
Vol 84-85 ◽  
pp. 219-223
Author(s):  
Xia Gao ◽  
Qiang Wu ◽  
Bao Yong Zhang
Keyword(s):  
Hydrate Formation ◽  
Equilibrium Composition ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Formation Pressure ◽  
Mixed Gas ◽  
Gas Hydrate Formation ◽  
Three Phase ◽  
Hydrate Phase ◽  
Hydrate Formation Process

The new method for separating drained coal bed methane (CBM) is based on gas hydrate formation. The thermodynamic parameters of incipient hydrate formation for the CH4-N2-O2-THF-H2O system were carefully determined. After establishing equilibrium state of three-phase coexistence, CH4 concentrations of vapor phase and that of hydrate phase were determined by GC. The results show that the higher the THF concentration, the larger the CH4 concentration in hydrate phase and the partition coefficient. It can provide the reference for seeking the optimal promoters in the hydrate formation process for the mixed gas.

scholarly journals Poly (Vinyl Alcohol) Composite Membrane with Polyamidoamine Dendrimers for Efficient Separation of CO2/H2 and CO2/N2

2021 ◽  
Author(s):  
yaxin zhao ◽  
Huafeng Tian ◽  
yuge ouyang ◽  
Aimin Xiang ◽  
Xiaogang Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Composite Membrane ◽  
High Selectivity ◽  
Gas Adsorption ◽  
Separation Efficiency ◽  
Separation Process ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Efficient Separation

Abstract Although polyvinyl alcohol (PVA) membranes are commonly used for CO2 separation, there is still large development space in mechanical properties and high selectivity of the gas separation process. In this study, the gas separation performance and mechanical properties of the (PVA/Cu2+) substrate membranes were improved by introducing polyamidoamine (PAMAM). PAMAM had an important effect on the gas adsorption and separation performance of the membrane. In addition, the gas adsorption and separation properties of the PVA/Cu2+/PAMAM membrane (PPCm) were analyzed and studied when the inlet gas pressure and the species of mixed gases were variable. The results showed that the crystallinity and mechanical properties of the membrane with the PAMAM had been significantly improved. Young’s modulus of PPCm with 30% PAMAM was 132% higher than that of the PVA/Cu2+ composite membrane without PAMAM. In addition, efficient separation efficiency and high selectivity of the gas separation process were observed. The separation factors of the PPCm for CO2/H2 and CO2/N2 were about three times higher than that of the PVA/Cu2+ substrate membranes. These results suggested that the introduction of PAMAM was promising for CO2 separation and permeation.

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