过渡金属型离子液体络合功能的构建、调控及高选择性捕集SO2研究

The selective capture of SO2 with recovery is of great significance for eliminating environmental pollution and enriching sulfur resources. It is difficult to possess both high absorption capacity and high selectivity of separation for existing SO2 capture technologies. There is an urgent need for the development of a new method of highly selective capture of SO2. Therefore, this project proposes a new idea of building complexation of transition metal-containing ionic liquid (MCILs) to achieve efficient SO2 selective absorption with excellent separation efficiency of SO2/CO2. In view of this idea, a series of transition metal-containing ionic liquid are designed and synthesized by regulating their complexing function. The absorption performance of SO2 and CO2 using synthesized MCILs as absorbent are explored to find out the correlations among the MCILs structure, absorption capability, and separation performance. Then, the mechanism of selective absorption of SO2 by MCILs is elucidated. Finally, the absorption kinetics and thermodynamics behavior of MCILs on SO2 are investigated. It can provide important theoretical support for achieving SO2 absorption with large capacity and high selectivity. The implementation of this project can provide a new direction for the selective separation of acid gas with ionic liquids.

选择性捕集与分离回收SO2对消除环境污染和丰富硫资源具有重要意义，现有SO2捕集技术存在吸收容量大和分离选择性高难以兼具的挑战，亟需发展高选择性捕集SO2的新方法。为此，本项目提出构建金属型离子液体的络合功能实现高选择性吸收分离SO2/CO2的全新思路。围绕该思路，设计合成一系列新型过渡金属配合物型离子液体（MCILs）并调控其络合功能，测试MCILs分别对SO2和CO2的吸收效果，系统探究MCILs的络合结构、吸收容量和吸收选择性三者之间的关系，阐明MCILs选择性吸收SO2的作用机理，考察MCILs对SO2的吸收动力学和热力学行为。为实现SO2高容量吸收和高选择性分离提供重要的理论支持。本项目的实施可为离子液体应用于酸性气体的选择性分离拓展新方向。

选择性捕集与分离回收SO2对消除环境污染具有重要意义，现有SO2捕集技术存在吸收容量大和分离选择性高难以兼具的挑战，亟需发展高选择性捕集SO2的新方法。本项目首先选定亚铁络合物FeIIEDTA为功能化吸收剂因其因其独特的络合功能，首先对其稳定性进行了相关研究。研究发现FeIIEDTA在空气中易氧化，于是通过加入二氧化硫脲，连二亚硫酸钠，抗抗坏血酸来保持其稳定，随后完成SO2分离实验研究方法的建立，全面进行功能化吸收剂吸收酸性气体SO2和NO的工作，考察了不同参数下所设计的金属络合吸收剂对气体吸收效果；同时根据吸收机理及实验结果，计算了宏观动力学特性和气-液传质行为，建立宏观动力学方程。最后探究了金属络合物吸收SO2和NO机理。该项目的实施将可为工业烟气的高效吸收拓展新方向。