CIESC Journal ›› 2017, Vol. 68 ›› Issue (2): 542-551.DOI: 10.11949/j.issn.0438-1157.20161033

Previous Articles     Next Articles

Solubility enhancement of CO2 in diethyl carbonate by ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide

XING Xiao1,2, ZHAO Zhijun2, TANG Zhigang2, ZHANG Shaofeng1, FEI Weiyang2, LIANG Xiangfeng3, LI Hongwei2, GUO Dong2   

  1. 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
    2. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    3. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2016-07-22 Revised:2016-08-24 Online:2017-02-05 Published:2017-02-05
  • Supported by:

    supported by the Natural Science Foundation of Beijing (2164062), the Key Laboratory of Green Process and Engineering, Institute of Process Engineering (LGPE-2014-01) and the State Key Laboratory of Chemical Engineering (SKL-ChE-15A01).

离子液体[Bmim][NTf2]对CO2在碳酸二乙酯中溶解性能的强化

邢潇1,2, 赵志军2, 汤志刚2, 张少峰1, 费维扬2, 梁向峰3, 李红伟2, 郭栋2   

  1. 1. 河北工业大学化工学院, 天津 300130;
    2. 化学工程联合国家重点实验室, 清华大学化学工程系, 北京 100084;
    3. 中国科学院过程工程研究所绿色过程与工程重点实验室, 北京 100190
  • 通讯作者: 赵志军, 张少峰
  • 基金资助:

    北京市自然科学基金项目(2164062);中国科学院过程工程研究所绿色过程与工程重点实验室开放基金课题项目(LGPE-2014-01);化学工程联合国家重点实验室开放课题项目(SKL-ChE-15A01)。

Abstract:

CO2 solubility in diethyl carbonate (DEC), ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([Bmim] [NTf2]), and their mixtures at various mass ratio were measured isovolumetrically at temperature of 308.15-328.15 K and pressure of 0-3 MPa. Effect of[Bmim] [NTf2] on DEC vapor pressure was studied using COSMO-RS model. The experimental results showed that CO2 solubility in DEC and[Bmim] [NTf2] increased with increasing pressure at constant temperature but decreased with increasing temperature at constant pressure. CO2 solubility in DEC was lower than that in[Bmim] [NTf2] under same conditions, which could be enhanced by adding[Bmim] [NTf2] to DEC. CO2 solubility in mixture of[Bmim] [NTf2] and DEC increased with increasing mass ratio of[Bmim] [NTf2] at constant temperature while CO2 solubility in mixtures of constant mass ratios decreased with increasing temperature. COSMO-RS simulation showed that percentage of DEC vapor pressure drop increased with increasing mass ratio of[Bmim] [NTf2] whereas DEC vapor pressure changed a little at temperature of 308.15-328.15 K for mixtures of same mass ratio.

Key words: ionic liquids, diethyl carbonate, carbon dioxide, physical absorption, simulation

摘要:

采用恒定容积法在温度范围308.15~328.15 K、压力范围0~3 MPa条件下测定了CO2在碳酸二乙酯(DEC)、离子液体[Bmim][NTf2]以及二者不同质量分数配比混合溶剂中的溶解度,并用COSMO-RS模型研究了离子液体的加入对DEC蒸气分压的影响。实验表明,在相同实验条件下CO2在[Bmim][NTf2]中的溶解度大于在DEC中的溶解度。[Bmim][NTf2]的加入可强化CO2在DEC中的溶解性能,在相同温度下CO2在混合溶剂中的溶解度随[Bmim][NTf2]质量分数增加而增大,在相同浓度的混合溶剂中CO2的溶解度随温度升高而降低。COSMO-RS模型计算表明,DEC的蒸气分压下降的分数随混合溶剂中离子液体质量分数增加而增大,而对于相同质量分数配比的混合溶剂温度对DEC的蒸气分压影响较小。

关键词: 离子液体, 碳酸二乙酯, 二氧化碳, 物理吸收, 模拟

CLC Number: