Gas hydrate formation method to capture the carbon dioxide for pre-combustion process in IGCC plant

In this study, we investigated the effect of tetra-n-butyl ammonium bromide (TBAB) on separation and/or collection of CO2 from CO2/H-2 (40:60) gas mixture via hydrate crystallization. The phase equilibrium conditions shifted to milder conditions as increasing the amount of TBAB additive up to 3.0 mol%. The existence of the critical concentration of the additive effects on the phase equilibrium conditions was also observed. The hydrate formation rate in 1.0 mol% TBAB solution showed the highest value while the hydrate formation rate in 3.0 mol% TBAB solution showed the lowest value. Raman analyses revealed that only CO2 gas molecules enclathrated under experimental conditions carried out in this study. The phase equilibrium temperature of CO2-H-2 (40:60) mixture gas hydrate systems with TBAB additive located in the range of between 283 and 290 K at the integrated gasification combined cycle (IGCC) process pressure range of 2.5-5.0 MPa. This study provides the potential of hydrate process to separate the CO2 gas from CO2-H-2 (40:60) mixture gas in IGCC process without significantly lowering the processing temperature. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

在本研究中，我们通过水合物结晶研究了四正丁基溴化铵（TBAB）对从二氧化碳/氢气（40:60）混合气体中分离和/或收集二氧化碳的影响。随着TBAB添加剂的量增加至3.0摩尔%，相平衡条件向更温和的条件转变。还观察到添加剂对相平衡条件存在临界浓度效应。1.0摩尔% TBAB溶液中的水合物形成速率最高，而3.0摩尔% TBAB溶液中的水合物形成速率最低。拉曼分析表明，在本研究进行的实验条件下，只有二氧化碳气体分子被包合。在整体煤气化联合循环（IGCC）工艺压力范围为2.5 - 5.0兆帕时，含TBAB添加剂的二氧化碳 - 氢气（40:60）混合气体水合物系统的相平衡温度位于283至290开尔文之间。本研究提供了水合物工艺在IGCC工艺中从二氧化碳 - 氢气（40:60）混合气体中分离二氧化碳气体的潜力，且不会显著降低处理温度。（C）2010年T. 内贾特·韦齐罗格鲁教授。由爱思唯尔有限公司出版。保留所有权利。