Temperature-responsive ionic liquid extraction and separation of the aromatic sulfur compounds
Temperature-responsive ionic liquid extraction and separation of the aromatic sulfur compounds
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芳香族硫化合物的温度响应型离子液体萃取分离
DOI：
10.1016/j.fuel.2014.09.083
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发表时间：
2015-01-15
期刊：
影响因子：
7.4
通讯作者：
Li, Huaming
中科院分区：
文献类型：
--
作者：
Jiang, Wei;Zhu, Wenshuai;Li, Huaming
研究了以温敏离子液体N-丁基-N-甲基哌啶四氯铁酸盐([C(4)mpip]FeCl4)为萃取剂，从模型油中萃取芳香族硫化物。在萃取法脱硫过程中，在45℃下反应10min，液液达到平衡。在萃取体系冷却到室温后，由于IL可逆的温控相变，IL返回固体。因此，油和固体[C(4)mpip]FeCl4很容易分离。DBT单次萃取后，萃取率和能斯特分配系数(K-N)分别达到45.5%和2.92。考察了提取温度、白介素量、初始硫含量、多次提取、重复使用和互溶等因素对提取效果的影响。不同硫化物的萃取能力大小顺序为DBT>；BT>；4，6-DMDBT。最后，采用实验和理论相结合的方法对萃取机理进行了系统的研究。与[C(8)mpip]FeCl4、[C(12)mpip]FeCl4和[C4Py]FeCl4三种离子液体的萃取能力相比，阳离子的大小和芳香族结构可能是两个积极的因素，但不是主要的萃取机理。通过红外光谱和理论计算证实了IL中的Fe原子与DBT中的S原子之间存在配位作用。(C)2014爱思唯尔有限公司。保留所有权利。
Extraction of aromatic sulfur compounds from model oil using a temperature-responsive ionic liquid (IL) N-butyl-N-methylpiperidinium tetrachloroferrate ([C(4)mpip]FeCl4) as extractant has been investigated. In the extractive desulfurization process, liquid-liquid equilibrium was obtained at 45 degrees C for 10 min. After the extraction system was cooled to room temperature, the IL returned to solid due to the reversible thermoregulated phase transition of the IL. Therefore, it was easy for separation of oil and solid [C(4)mpip]FeCl4. The extraction efficiency and Nernst partition coefficient (K-N) could get to 45.5% and 2.92, respectively, after a single extraction of DBT. Some important factors, such as extraction temperature, the amount of IL, initial sulfur content, multiple extractions, reusability and the mutual solution were investigated. The extraction ability of different sulfur compounds followed the order DBT > BT > 4,6-DMDBT. Finally, the extraction mechanism was studied systematically with experimental and theoretical methods. Compared with the extraction abilities of another three ILs, [C(8)mpip]FeCl4, [C(12)mpip]FeCl4 and [C4Py]FeCl4, the size and aromatic structure of cation may be two positive factors but not the main extraction mechanism. The coordination interaction between Fe atom of IL and S atom of DBT was confirmed by IR spectra and theoretical computation. (C) 2014 Elsevier Ltd. All rights reserved.