Semiclathrate based CO2 capture from fuel gas mixture at ambient temperature: Effect of concentrations of tetra-n-butylammonium fluoride (TBAF) and kinetic additives
Semiclathrate based CO2 capture from fuel gas mixture at ambient temperature: Effect of concentrations of tetra-n-butylammonium fluoride (TBAF) and kinetic additives
复制标题
环境温度下从燃气混合物中捕获基于半包合物的 CO2：四正丁基氟化铵 (TBAF) 和动力添加剂浓度的影响
DOI：
10.1016/j.apenergy.2018.02.133
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发表时间：
2018-05-01
期刊：
影响因子：
11.2
通讯作者：
Linga, Praveen
中科院分区：
文献类型：
--
作者：
Zheng, Junjie;Bhatnagar, Krittika;Linga, Praveen
用于从燃气中捕获燃烧前二氧化碳的水合物气体分离（HBGS）是减少碳排放的有吸引力的方法之一。为了进一步推进 HBGS 技术，需要确定能够调节操作条件并提高动力学和分离效率的促进剂。四正丁基氟化铵 (TBAF) 是一种半笼形形成剂，可以使 HBGS 工艺在环境温度下运行。本研究在搅拌釜反应器中，在压力为 6.0 MPa、温度驱动力为 4.1 K 的条件下，评估了不同 TBAF 浓度下 CO2/H-2/TBAF 半笼形物形成的动力学性能。与其他浓度相比，0.8 和 1.5 mol% 溶液表现出更高的气体吸收量（按溶液体积归一化）、水合物形成速率和捕获气体中的 CO2 组成。此外，还测试了三种动力学添加剂对水合物形成的影响，包括十二烷基硫酸钠（SDS）、亮氨酸和色氨酸。所有添加剂都可以减少诱导时间并提高水合物形成速率。水合物形成的视觉图像表明两种形态风格，其中II型的出现与长诱导时间和亮氨酸或色氨酸的存在高度相关。
Hydrate-based gas separation (HBGS) for pre-combustion CO2 capture from fuel gas is one of the attractive methods to reduce carbon emission. To further advance the HBGS technology, there is a need to identify promoters that can moderate the operating conditions and enhance the kinetics and separation efficiency. Tetra-n-butylammonium fluoride (TBAF) is a semiclathrate former that can enable the HBGS process to be operated at ambient temperatures. In this study, the kinetic performance of CO2/H-2/TBAF semiclathrate formation was evaluated under various TBAF concentrations in a stirred tank reactor at 6.0 MPa with a temperature driving force of 4.1 K. Compared with other concentrations, 0.8 and 1.5 mol% solutions exhibited higher gas uptake (normalized by the solution volume), hydrate formation rate, and CO2 composition in the captured gas. In addition, the effects of three kinetic additives on hydrate formation were tested, including sodium dodecyl sulfate (SDS), leucine, and tryptophan. All additives could reduce the induction time and increase the hydrate formation rate. The visual images of hydrate formation indicated two morphology styles, with the occurrence of style II identified to be highly related to the long induction time and the presence of leucine or tryptophan.