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Capturing Condensable Gases with Ionic Liquids
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-08-27 , DOI: 10.1021/acs.iecr.8b02420
Gangqiang Yu 1 , Chengna Dai 1 , Hui Gao 1 , Ruisong Zhu 1 , Xiaoxiao Du 1 , Zhigang Lei 1
Affiliation  

Ionic liquids (ILs) have been proposed to simultaneously capture a variety of condensable gases for the first time. The hydrophobic IL [EMIM][Tf2N] was selected as a suitable absorbent screened by the COSMO-RS (conductor-like screening model for real solvents) model, which in combination with the quantum chemistry calculation provided some theoretical insight into mechanisms with respect to condensable gas capture. Considering the simultaneous capture of volatile organic compounds (VOCs) and water, we selected benzene, toluene, and p-xylene (BTX) as three kinds of VOC representatives, measured the vapor–liquid equilibrium (VLE) of BTX + [EMIM][Tf2N] mixture systems, and compared them with the predicted results by the UNIFAC–Lei model. The experiment of capturing condensable gases with [EMIM][Tf2N] as the absorbent was conducted. Furthermore, the conceptual design of continuous processes with [EMIM][Tf2N] and the conventional benchmark solvent triethylene glycol as absorbents at the industrial scale was performed using a rigorous equilibrium stage model with the UNIFAC–Lei model parameter input. It reveals that condensable gas capture with an IL belongs to a typical process intensification technology in chemical engineering.

中文翻译:

用离子液体捕获可凝性气体

已经提出了离子液体(IL)来首次同时捕获多种可冷凝气体。疏水性IL [EMIM] [Tf 2 N]被选作COSMO-RS(对于实际溶剂的类似导体的筛选模型)模型筛选的合适吸收剂,该模型与量子化学计算相结合,为机理研究提供了一些理论上的见解。关于可冷凝气体的收集。考虑到同时捕获挥发性有机化合物(VOC)和水,我们选择了苯,甲苯和二甲苯(BTX)作为三种VOC代表,测量了BTX + [EMIM]的气液平衡(VLE)[ Tf 2N]个混合系统,并将其与UNIFAC–Lei模型的预测结果进行比较。进行了以[EMIM] [Tf 2 N]为吸收剂的可凝性气体捕集实验。此外,在工业规模上使用[EMIM] [Tf 2 N]和常规基准溶剂三乙二醇作为吸收剂的连续过程的概念设计是使用严格的平衡阶段模型和UNIFAC–Lei模型参数输入进行的。结果表明,带IL的可凝性气体捕集属于化学工程中的典型工艺强化技术。
更新日期:2018-08-28
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