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首页> 外文期刊>Separation and Purification Technology >Separation of propylene and propane by alkylimidazolium thiocyanate ionic liquids with Cu+ salt
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Separation of propylene and propane by alkylimidazolium thiocyanate ionic liquids with Cu+ salt

机译：烷基咪唑硫氰酸盐离子液体与Cu +盐分离丙烯和丙烷

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Ionic liquids (ILs) coupled with Ag+ or Cu+. salts to form a new kind of reactive absorbent have been studied to separate light olefin from paraffin recently. In this work, we prepared two halogen-free alkylimidazolium thiocyanate ILs with cheaper cuprous thiocyanate, i.e., [Bmim]SCN-CuSCN and [Emim]SCN-CuSCN (Bmim, 1-butyl-3-methylimidazolium; Emim, 1-ethyl-3-methylimidazolium) and investigated their absorption capability for propylene, propane and mixture of both at 1-7 bar and 298-318K. The effects of operating parameter including cation nature, temperature, pressure, Cu+ concentration and reuse of absorbent were investigated. Propylene shows a chemical absorption while propane does a physical one, and increasing Cu+ concentration effectively improves the absorption capability for propylene and the selectivity of propylene/propane. [Bmim]SCN-CuSCN has higher absorption capability and selectivity for propylene than [Emim]SCN-CuSCN, e.g., [Bmim]SCN-CuSCN-1.5 M can absorb 0.12 mol of propylene per liter while 0.012 mol of propane per liter at 1 bar and 298 K, with a selectivity of 10, which is comparable to some other ILs-Ag+ salts and better than pure ILs. Such absorbents can be regenerated through temperature and pressure swing without remarkable activity loss. This work shows that alkylimidazolium thiocyanate ILs with Cu+ salts are promising reactive absorbents to separate propylene from propane. (C) 2015 Elsevier B.V. All rights reserved.
机译：与Ag +或Cu +结合的离子液体（ILs）。最近，人们研究了形成一种新型反应性吸收剂的盐以从石蜡中分离轻质烯烃。在这项工作中，我们制备了两种便宜的硫氰酸亚铜的无卤烷基咪唑硫氰酸盐IL，即[Bmim] SCN-CuSCN和[Emim] SCN-CuSCN（Bmim，1-丁基-3-甲基咪唑鎓; Emim，1-乙基- 3-甲基咪唑鎓），并研究了它们在1-7 bar和298-318K下对丙烯，丙烷及其混合物的吸收能力。研究了操作参数对阳离子性质，温度，压力，Cu +浓度和吸收剂再利用的影响。丙烯显示化学吸收，而丙烷显示物理吸收，增加Cu +浓度可有效提高对丙烯的吸收能力和丙烯/丙烷的选择性。与[Emim] SCN-CuSCN相比，[Bmim] SCN-CuSCN对丙烯的吸收能力和选择性更高，例如，[Bmim] SCN-CuSCN-1.5 M可以每升吸收0.12 mol丙烯，而每升0.012 mol丙烷bar和298 K，选择性为10，与其他一些ILs-Ag +盐相当，并且优于纯ILs。这种吸收剂可以通过温度和压力的变化而再生，而没有明显的活性损失。这项工作表明，带有铜盐的烷基咪唑硫氰酸盐类离子液体有望将丙烯与丙烷分离。 （C）2015 Elsevier B.V.保留所有权利。

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