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[1]赵卫伟,巫先坤,李长浩,等. 咪唑类离子液体对低压丙酮蒸气吸收性能研究[J].南京大学学报(自然科学),2017,53(6):1171.[doi:10.13232/j.cnki.jnju.2017.06.019]
 Zhao Weiwei,Wu Xiankun,Li Changhao,et al.Study on absorption of low pressure acetone vapor in imidazole ionic liquids[J].Journal of Nanjing University(Natural Sciences),2017,53(6):1171.[doi:10.13232/j.cnki.jnju.2017.06.019]
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 咪唑类离子液体对低压丙酮蒸气吸收性能研究()
     

《南京大学学报(自然科学)》[ISSN:0469-5097/CN:32-1169/N]

卷:
53
期数:
2017年第6期
页码:
1171
栏目:
出版日期:
2017-12-01

文章信息/Info

Title:
Study on absorption of low pressure acetone vapor in imidazole ionic liquids
作者:
 赵卫伟1巫先坤3李长浩2陆 琛2张 锋2*
1.江苏瑞达环保科技有限公司,盐城,224000;
2.南京大学化学化工学院,南京,210023;
3.南京大学盐城环保技术与工程研究院,盐城,224000
Author(s):
Zhao Weiwei1Wu Xiankun3Li Changhao2Lu Chen2Zhang Feng2*
1.Jiangsu Ruida Environmental Technology Co.,Ltd,Yancheng,224000,China;
2.School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,210023,China;
3.Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering,Yancheng,224000,China
关键词:
 低压吸收气液平衡挥发性有机化合物离子液体热力学分析
Keywords:
 low vapor pressure aborptionvapor liquid equilibriumvolatile organic compoundsionic liquidsthermodynamical analysis
分类号:
X511
DOI:
10.13232/j.cnki.jnju.2017.06.019
文献标志码:
A
摘要:
 在303.2~333.2 K范围内,采用三釜气液平衡系统测量丙酮与5种咪唑类离子液体的二元气液平衡数据.然后采用非随机(局部)双液体模型(NRTL)关联二元体系的等温气液平衡.最后基于模型,获得了丙酮蒸气在离子液体中的无限稀释活度系数和亨利系数,并评价了吸收过程的Gibbs自由能、焓变、熵变和偏摩尔过量焓变等热力学性质.实验表明,亨利系数随着温度升高而增大,丙酮的无限稀释活度系数均小于1,混合溶液为负偏差溶液,利于丙酮的吸收.延长阳离子侧链烷基长度可缓慢提高丙酮溶解度,但相对于阳离子而言,阴离子对丙酮溶解度影响较大,且按如下顺序递增:[BF4]<[PF6]<[Tf2N].热力学分析表明丙酮吸收由体系的熵变控制.[Tf2N]类离子液体吸收熵变值较大,混合溶液热力学稳定性高,与丙酮分子间作用力强,对丙酮溶解性能强.
Abstract:
 Low vapor liquid equilibrium(VLE)of acetone binary mixtures with five imidazole ionic liquids(ILs)was respectively investigated by using ternary-vessel equilibrium system.VLE measurements were carried out over an extremely low concentration range and at the temperature ranging from 303.2 to 333.2 K.On basis of the solubility data,the infinite dilution activity(γ∞)and Henry’s constant(H)were derived and described by using the nonrandom two-liquid model(NRTL).Moreover,the thermodynamic properties of absorption process such as Gibbs energy,partial molar enthalpies and entropies,partial molar excess enthalpies at infinite dilution(HE,∞i),were correlated.The obtain results indicate that Henry’s constant increases with a rise in temperature,implying that absorption of acetone is a typical physical absorption.Owing to the γ∞ all being less than 1,the mixtures show negative deviation solution,which benefits of absorption.Lengthening the length of substituted alkyl slightly enhances the solubility.Relative to cation species,the anion plays a great role in determining the solubility,which increases as order[BF4]<[PF6]<[Tf2N].From thermodynamic analysis,it is found the process of acetone vapor absorption is regulated by entropy.The absorption entropy change of acetone in[Tf2N]species is greater of the three,resulting in better thermodynamical stability and great intermolecular force between acetone and ILs.

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备注/Memo

备注/Memo:
 基金项目:国家自然科学基金(91634104,21476105),江苏省产学研项目-前瞻性联合研究项目(BY2016068-03)
收稿日期:2017-09-14
*通讯联系人,E-mail:zf@nju.edu.cn
更新日期/Last Update: 2017-11-28