共查询到18条相似文献,搜索用时 93 毫秒
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室温离子液体具有独特的气体选择溶解性,在二氧化碳(CO2)的捕集和分离中有很好的应用前景。综述了近年来CO2在不同离子液体中的溶解度研究进展,比较了CO2在常规离子液体和功能型离子液体中的不同溶解机制,分析、归纳了向离子液体中引入不同官能团对CO2溶解性能的影响规律,指出了离子液体捕集CO2的未来研究方向。 相似文献
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离子液体(ILs)作为一种新型的绿色溶剂在吸收和分离一氧化碳(CO)方面显示出了独特的优异性和潜在的应用价值。对近年来ILs参与CO吸收分离的研究工作进展进行了综述,主要包括常规ILs、阴离子功能化ILs、ILs/Cu (Ⅰ)盐和ILs支撑液膜。重点论述了CO在ILs中的溶解度及对其他气体的选择性,并与ILs吸收分离二氧化碳(CO2)性能进行了比较;着重讨论了阴阳离子种类、取代基类型、温度、压力等因素对ILs吸收分离CO性能的影响,并介绍了ILs吸收CO的机理。最后,对设计合成新型功能化ILs应用于高效吸收分离CO提出了一些建议。 相似文献
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一、离子液体简介室温离子液体(R oom T em perature lonic Liq-uids,R T ILs)是由有机阳离子和无机或有机阴离子构成的、在室温或室温附近温度下呈液体状态的盐类,简称离子液体。最初的离子液体是1914年发现的硝基乙胺,但在此后的60多年里离子液体的研究一直处于停滞状态,直到 相似文献
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基于绿色合成方法制备出亲水性离子液体(ILs)[NH2-C3mim][Br],从有效降低CO2吸收-解吸操作成本出发,采用ILs-H2O复配吸收剂,开展了常温加压CO2吸收及吸收剂常温减压解吸再生实验。结果表明,比CO2吸收量(基于复配吸收剂或离子液体组分)随复配吸收剂中ILs组分浓度而变;吸收初期,CO2吸收速率随吸收剂配比变化显著;以CO2高吸收率和吸收剂低成本为目标,优选出新型水基复配吸收剂(离子液体与水质量比为1.38:1)。分别以水基离子溶液、改良热钾碱液和活化复配醇胺液为吸收剂,在自行搭建的超重力场强化吸收-连续逆流接触(加热或减压)解吸再生台架实验装置上进行了CO2捕获与吸收剂再生连续化实验。结果表明,在超重力场作用下,改良热钾碱液和活化复配醇胺液对CO2有较好的捕获,吸收率分别在98%、96%和90%以上,3种吸收剂经加热或减压解吸再生后均可循环回用,水基离子溶液吸收剂在常温减压下解吸更具有实际可操作性。 相似文献
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High pressure solubility of carbon dioxide in three phosphonium-based ionic liquids has been measured experimentally. A synthetic method was used to measure vapor–liquid, vapor–liquid–liquid and liquid–liquid equilibria of carbon dioxide in the ionic liquids trihexyltetradecylphosphonium bromide [thtdp][Br], trihexyltetradecylphosphonium dicyanamide [thtdp][dca] and trihexyltetradecylphosphonium bis(2,4,4-trime-thylpentyl)phosphinate [thtdp][phos] for a temperature range of 271–363 K and up to 90 MPa. Furthermore, the densities and viscosities of these ILs have been measured in a temperature range of 293–363 K. The solubility of carbon dioxide in these ILs is (on mole fraction basis) significantly larger than most of the commonly used fluorinated imidazolium ionic liquids. The latter statement, however, does not hold for the [Br] and [dca] based IL if the solubility is compared on molality (mole/mass solvent) basis, where the solubility differences among physical ILs tends to vanish indicating a strong molecular weight effect. The solubility of carbon dioxide in [thtdp][phos], both on mole fraction and molality basis, is among the highest compared to all the other physical ILs reported so far in the literature. The Peng–Robinson equation of state in combination with Wong–Sandler mixing rules incorporating the NRTL Gibbs excess energy model was applied to represent the experimental data with acceptable accuracy. 相似文献
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Bang-Hyun Lim Woo-Hyuk Choe Jae-Jin Shim Choon Sup Ra Dirk Tuma Heun Lee Chul Soo Lee 《Korean Journal of Chemical Engineering》2009,26(4):1130-1136
The solubility of carbon dioxide in three ionic liquids (ILs) under supercritical fluid condition was measured at pressures
up to 32 MPa and at temperatures of 313.15, 323.15, and 333.15 K in a high-pressure view cell. The imidazolium-derivative
ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), and 1-octyl-3-methylimidazolium tetrafluoroborate ([omim][BF4]) were employed in this research. The effects of pressure, temperature, nature of anion and cation as well as the water content
on the solubility of CO2 in the ILs were investigated experimentally. The solubility of CO2 in the IL was higher for the ILs with longer cationic alkyl group and for the ILs with lower anion polarity. The lower the
water content or the lower the temperature as well as the higher the pressure, the higher was the solubility of CO2. 相似文献
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Shaohui Xiong Deming Yin Muhammad Umar Javaid Liang Li Chunyue Pan Juntao Tang Guipeng Yu 《Israel journal of chemistry》2019,59(9):824-831
Ionic liquids (ILs) have gained wide‐spread focus owing to its negligible vapor pressure, low heat capacity, high thermal stability, and structural diversity. The solubility and selectivity toward carbon dioxide has made ILs a unique platform that possess the potential in gas separations. In particularly, combining functional ILs with membranes and porous supports is an efficient way to design task‐specific materials for CO2 separations. This minireview summarizes the developments and advances of ionic liquids‐based membranes for CO2 separations in recent three years, with an emphasis on the strategy of incorporating ionic liquids and CO2 separation performance. 相似文献
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This study explores the use of COSMO-RS model and Peng-Robinson (PR) equation of state (EoS) to predict the solubility of carbon dioxide (CO2) in specific ionic liquids (ILs). COSMO-RS was employed to estimate of CO2 solubility at atmospheric pressure in eight imidazolium-based ILs resulting from the combination of ethyl, butyl, hexyl, and octyl-imidazolium cations with two anions: bis(trifluoromethylsulfonyl)imide ([Tf2N]) and Trifluoromethanesulfonate ([TFO]). The results indicated relatively acceptable qualitative consistency between the experimental and predicted values. The PR EoS was employed at high pressure by tuning the interaction parameters to fit the experimental data reported in the literature. The model demonstrated excellent accuracy in predicting the solubility of CO2 at pressure values less than the critical pressure of CO2; however, at higher pressures, the calculated solubility diverged from the experimental values. Furthermore, the type of anion and cation used in the IL affected the performance of the PR EoS. 相似文献
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Chengna Dai Zhigang Lei Wei Wang Li Xiao Biaohua Chen 《American Institute of Chemical Engineers》2013,59(11):4399-4412
The group contribution lattice fluid equation of state (GCLF EOS) was first extended to predict the thermodynamic properties for carbon dioxide (CO2)–ionic liquid (IL) systems. The group interaction parameters of CO2 with IL groups were obtained by means of correlating the exhaustively collected experimental solubility data at high temperatures (above 278.15 K). New group parameters between CO2 and IL groups were added into the current parameter matrix. It was verified that GCLF EOS with two kinds of mixing rules could be used for predicting the CO2 solubility in ILs, and volume expansivity of ILs upon the addition of CO2, as well as identifying the new structure–property relation. Moreover, it is the first work on the measurement of the solubility of CO2 in ILs at low temperatures (below 278.15 K), manifesting the applicability of predictive GCLF EOS over a wider temperature range. © 2013 American Institute of Chemical Engineers AIChE J, 59: 4399–4412, 2013 相似文献
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Poongunran Muthukumaran Ram B. Gupta Hwan-Do Sung Jae-Jin Shim Hyo-Kwang Bae 《Korean Journal of Chemical Engineering》1999,16(1):111-117
The use of supercritical carbon dioxide is emerging as a potential method for achieving pollution-free dyeing. An important
factor in supercritical fluid dyeing is the solubility of the dye in supercritical carbon dioxide. Our measurements show that
the solubility of C. I. Disperse Red-60 dye in supercritical carbon dioxide is significantly enhanced upon addition of polar
csolvents : ethanol and acetone. The solubility enhancement is attributed to the formation of hydrogen bonds between cosolvent
and dye molecules. Observed solubility behavior is correlated using dilute-solution theory with lattice-fluid-hydrogen-bonding
model. Needed physical and hydrogen-bonding molecular parameters are estimated using the experimental data. 相似文献
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Summary Three silicon compounds, dimethyldimethoxysilane (DMDMOS), decamethylcyclopentasiloxane (DMCPS), and 1,1,3,3-tetramethyldisiloxane
(TMDSO), were plasma-polymerized, and the solubility coefficient and the permeation coefficient of carbon dioxide and nitrogen
gas were determined. The permeation properties of the deposited films were discussed. The plasma polymers formed from DMDMOS,
DMCPS, and TMDSO showed preferential solubility for carbon dioxide. The solubility coefficient of carbon dioxide was closely
related to the concentration of Si-(O-)4 moieties in the plasma polymers. However, these plasma polymers showed no selective permeation of carbon dioxide. The diffusion
process rather than the solution process controlled the permeation of carbon dioxide across the plasma polymers. Plasma polymers
formed from silicon compounds, if the polymers are less cross-linked, are expected to be a good material for CO2-selective membrane. 相似文献