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首页> 外文期刊>Separation and Purification Technology >Room temperature ionic liquid with silver salt as efficient reaction media for propylene/propane separation: Absorption equilibrium
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Room temperature ionic liquid with silver salt as efficient reaction media for propylene/propane separation: Absorption equilibrium

机译：室温离子液体，以银盐为丙烯/丙烷分离的有效反应介质：吸收平衡

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摘要

In this study the selective absorption of propylene from their mixtures with propane by chemical com-plexation with silver ions in ionic liquid solutions has been performed. The solubilities of propylene and propane in the reactive medium, silver tetrafluoroborate dissolved in 1-butyl-3-methyIirnidazolium tetrafluoroborate (silver salt concentration = 0.25 M), were investigated as functions of temperature and pressure. The temperature range was between 278 and 318 K for the absorption equilibrium data obtained. A simple mathematical model has been developed to describe the total propylene absorption in the reaction media under study, based in the formation of complexes with different stoichiometry, and the parameter model were obtained. It was found that gas solubilities increased with pressure and decrease with temperature of the system; this indicates that complex formation is an exothermic process and consequently the equilibrium constants will decrease with increasing temperature. Complete regeneration of the reaction media can be carried out at room temperature, 800 rpm stirrer speed and 20 mbar vacuum for 3 h. As conclusion, the recovery of the olefin (propylene) via silver complexation has been successfully carried out in ionic liquid media and, the ionic liquid containing silver ions showed higher sorption capacity for propylene than the corresponding aqueous solution.
机译：在这项研究中，通过在离子液体溶液中与银离子进行化学络合，从丙烯与丙烷的混合物中选择性吸收了丙烯。研究了丙烯和丙烷在反应介质中的溶解度，即四氟硼酸银溶解在1-丁基-3-甲基吡咯烷四氟硼酸溶液中（银盐浓度= 0.25 M），它是温度和压力的函数。对于获得的吸收平衡数据，温度范围为278至318K。建立了一个简单的数学模型来描述所研究的反应介质中丙烯的总吸收量，该模型以化学计量不同的配合物的形成为基础，并获得了参数模型。发现气体溶解度随压力增加而降低，随系统温度降低。这表明络合物的形成是一个放热过程，因此平衡常数将随温度的升高而降低。反应介质的完全再生可以在室温，800 rpm搅拌器速度和20 mbar真空下进行3 h。结论是，已经在离子液体介质中成功地通过银络合回收了烯烃（丙烯），并且含有银离子的离子液体对丙烯的吸附能力比相应的水溶液高。

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