Highly efficient absorption of methyl tert-butyl ether with ionic liquids

三甘醇 离子液体 UNIFAC公司 化学 摩尔分数 吸收(声学) 甲基叔丁基醚 乙醚 热力学 活度系数 物理化学 有机化学 材料科学 催化作用 水溶液 复合材料 物理
作者
Min Chen,Chengna Dai,Gangqiang Yu,Ning Liu,Ruinian Xu,Ning Wang,Biaohua Chen
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:282: 120108-120108 被引量:6
标识
DOI:10.1016/j.seppur.2021.120108
摘要

In this work, the technology for absorbing methyl tert-butyl ether (MTBE) with ionic liquids (ILs) is first proposed and systematically investigated from the molecular level to system scale. The imidazolium-based ILs, [BzMIM][Tf2N] and [AMIM][Tf2N] are screened from 272 IL species using the COSMO-RS model. The absorption mechanism at the molecular level is explored by combined characterization techniques (i.e. 1H NMR and FT-IR) with quantum chemical (QC) calculations (i.e. binding energy and weak interaction analyses). The vapour-liquid equilibrium (VLE) of MTBE-IL and MTBE-triethylene glycol (TEG) systems are experimentally determined and predicted through the UNIFAC-Lei model. The results show that the model can well quantitatively predict the VLE of these mixed systems. Moreover, the equilibrium absorption capacities of MTBE in ILs and TEG are measured and the magnitude is in the order of [BzMIM][Tf2N] > [AMIM][Tf2N] > TEG. The equilibrium stage and rate-based models on the basis of the UNIFAC-Lei model is established to perform the process design and optimization for MTBE absorption. When achieving the same separation task (i.e., MTBE content in the product gas less than 500 ppm in mole fraction), the mixed absorbent of [AMIM][Tf2N] + TEG has the lower loss of product gas and the lower energy demands (i.e., heating and cooling energy along with exergy demands) compared with the pure TEG and pure IL processes. This validates that ILs are potential absorbents and IL-based mixed absorbents may be the better strategy for achieving highly efficient absorption of MTBE.
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