高效液液相变吸收剂的开发及捕获CO2反应机制的研究

有机胺-环丁砜-水液液相变吸收剂对燃烧后二氧化碳捕集具有低能耗、高效吸收效率和环境友好等优势，因处于研究初级阶段其吸收二氧化碳过程的反应机制和相变行为影响吸收性能的科学问题尚不清晰。本项目拟明确有机胺分子结构与相变行为和二氧化碳捕获性能间的构效关系，并揭示胺/砜比和胺浓度对相变二氧化碳负载操作宽度的作用规律，遴选几种具有操作口宽、相变容易、吸收速率快和容量大等优良性能的有机胺-环丁砜-水液液相变吸收剂；摸清液液相变溶液及富CO2和贫CO2层溶液的吸收限度，揭示吸收剂的吸收潜力；利用NMR技术探明两相溶液的离子浓度分布规律，探究二氧化碳吸收过程的动力学性能及建立动力学模型，进而阐明有机胺-环丁砜-水液液相变吸收剂吸收二氧化碳的反应机制；精准探究分相CO2负载范围对传质行为和操作条件对传质性能的作用规律，建立相应的传质模型。本项目有望为液液相变吸收剂捕获二氧化碳的应用提供技术和理论指

The liquid-liquid biphasic absorbents of amine-sulfolane-water have the advantages of low energy consumption for CO2 stripping, effective absorption efficiency and environmentally friendly, but the reaction mechanism for CO2 absorption and the effects of the biphasic behavior on CO2 capture performance are unclear due to few studies. The structure activity relationship between the chemical structure of amine and biphasic behavior as well as CO2 capture performance, and the effects of amine/sulfolane ratio and amine concentration on the biphasic CO2 loading will be investigated in order to find the excellent biphasic absorbents of amine-sulfolane-water with performances of wide CO2 loading, easy phase transition, fast absorption rate and large CO2 capacity. Then, the vapor−liquid equilibrium of CO2 of the developed biphasic absorbents is determined and evaluated. In order to establish the reaction mechanism of CO2 absorption into biphasic absorbents, the species in the rich CO2 and lean CO2 solutions are measured by using NMR, and the kinetics and corresponding model are also studied. Furthermore, the effects of the biphasic behavior and the effects of operational conditions on the mass transfer performance will be investigated, then the accurate model for mass transfer is built. This project can give guidance and technology support for the industrial application of liquid-liquid biphasic absorbent.