Thermodynamic validation of 1-alkyl-3-methylimidazolium carboxylates as task-specific ionic liquids for H2S absorption
Thermodynamic validation of 1-alkyl-3-methylimidazolium carboxylates as task-specific ionic liquids for H2S absorption
复制标题
1-烷基-3-甲基咪唑羧酸盐作为特定任务离子液体用于 H2S 吸收的热力学验证
DOI：
10.1002/aic.13976
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发表时间：
2013-06-01
期刊：
影响因子：
3.7
通讯作者：
Zhang, Zhi-Bing
中科院分区：
文献类型：
--
作者：
Huang, Kuan;Cai, Da-Niu;Zhang, Zhi-Bing
在293.15 ~ 333.15K和350 kPa压力范围内，测定了H2S在5种1-烷基-3-甲基咪唑羧酸盐离子液体（ILs）中的溶解度。结果表明，这些离子液体具有显着更大的吸收容量为H2S比那些常见的离子液体在文献中报道。发现溶解度随着阴离子碱度的增加而显著增加，随着阳离子上烷基链长度的增加而略有增加。它进一步表明，吸收等温线是典型的非理想。在假设H2S与离子液体形成络合物的基础上，建立了一个反应平衡热力学模型，并与实验溶解度进行了关联。该模型支持两个IL分子与一个H2S分子相互作用的AB 2型反应机制。热力学参数，如亨利定律常数，反应平衡常数，和络合物的形成热也被计算，以评估在这些离子液体的吸收过程中的H2S。(c)2012美国化学工程师学会AIChE J，59：22272235，2013
Solubilities of H2S in five 1-alkyl-3-methylimidazolium carboxylates ionic liquids (ILs) have been measured at temperatures from 293.15 to 333.15 K and pressures up to 350 kPa. It is shown that these ILs have significantly larger absorption capacities for H2S than those common ILs reported in the literature. The solubility is found to increase dramatically with the increasing alkalinity of the anions and slightly with the increasing length of the alkyl chains on the cations. It is further demonstrated that the absorption isotherms are typically nonideal. With the assumption of complex formation between H2S and ILs, a reaction equilibrium thermodynamic model is developed to correlate the experimental solubilities. The model favors a reaction mechanism of AB2 type that two IL molecules interact with one H2S molecule. Thermodynamic parameters such as Henry's law constants, reaction equilibrium constants, and heat of complex formation are also calculated to evaluate the absorption process of H2S in these ILs. (c) 2012 American Institute of Chemical Engineers AIChE J, 59: 22272235, 2013