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Absorption of SO2 by renewable ionic liquid/polyethylene glycol binary mixture and thermodynamic analysis

机译：可再生离子液体/聚乙二醇二元混合物对SO2的吸收及热力学分析

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Separation and removal of SO2 before atmospheric release of the flue gas is essential to combat acid rain formation. Traditional chemical absorbents and conventional ionic liquids (ILs) suffer from several shortcomings including waste, second pollution, high viscosity, poor biodegradability and low absorption capacity. In this work, two renewable ILs where both cation and anion come from biodegradable materials, 2-hydroxyethyl-trimethylammoniume levulinate ([Choline][LA]) and 2-hydroxyethyl-trimethylammoniume lactate ([Choline] L), were synthesized and mixed with polyethylene glycol 200 (PEG200) to form 40 w% ILs binary mixture as SO2 absorbents. Solubilities of SO2 in the above two mixtures were measured under the temperature range of 303.15-333.15 K and the pressure up to 1.2 bar, with the result of 6.97-7.24 mol kg (1) absorbents at 1.0 bar and 303.15 K. When the SO2 pressure is reduced to 0.039 bar, the solubilities are still 1.77-1.84 mol kg (1) absorbents. Reaction Equilibrium Thermodynamic Model (RETM) was used to analysis the thermodynamic behavior of SO2 in present ILs mixtures. The obtained absorption enthalpies are as low as -39.81 and -51.69 kJ mol(-1) for the two binary mixtures, respectively. The two mixtures possess one or more improvements over commonly reported ILs in the aspects of biodegradability, absorption capacity, cost and energy consumption for regeneration of absorbents.
机译：在大气中释放烟道气之前，分离和去除SO2对于抵抗酸雨的形成至关重要。传统的化学吸收剂和传统的离子液体（ILs）有几个缺点，包括浪费，二次污染，粘度高，生物降解性差和吸收能力低。在这项工作中，合成了阳离子和阴离子均来自可生物降解材料的两种可再生IL，2-羟乙基-三甲基铵乙酰丙酸酯（[Choline] [LA]）和2-羟乙基-三甲基铵乳酸（[Choline] L），并与聚乙二醇200（PEG200）形成40 w％ILs二元混合物，作为SO2吸收剂。在303.15-333.15 K的温度范围和最高1.2 bar的压力下测量了上述两种混合物中SO2的溶解度，结果在1.0 bar和303.15 K的条件下得到6.97-7.24 mol kg（1）吸收剂。压力降至0.039 bar，溶解度仍为1.77-1.84 mol kg（1）吸收剂。使用反应平衡热力学模型（RETM）分析当前ILs混合物中SO2的热力学行为。对于两种二元混合物，获得的吸收焓分别低至-39.81和-51.69 kJ mol（-1）。在吸收剂再生的生物降解性，吸收能力，成本和能量消耗方面，两种混合物相对于通常报道的IL具有一种或多种改进。

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