CO2 Capture technologies: Current status and new directions using supported ionic liquid phase (SILP) absorbers
作者:Helene Kolding、Rasmus Fehrmann、Anders Riisager
DOI:10.1007/s11426-012-4683-x
日期:2012.8
Current state-of-the-art techniques for CO2 capture are presented and discussed. Post-combustion capture of CO2 by absorption is the technology most easily retrofitted to existing installations, but at present this is not economically viable to install and run. Using ionic liquids instead of aqueous amine solutions overcomes the major thermodynamic issues. By applying SILP technology further advances, in terms of ease of handling and sorption dynamics, are obtained. Initial experimental studies showed that ionic liquids such as tetrahexylammonium prolinate, [N6666][Pro], provide a good candidate for CO2 absorption using SILP technology. Thus a solid SILP absorber comprised of 40 wt% [N6666][Pro] loaded on precalcined silica quantitatively takes up about 1.2 mole CO2 per mole of ionic liquid in consecutive absorption-desorption cycles in a flow-experiment performed with 0.09 bar of CO2 (9% CO2 in He).
介绍并讨论了当前最先进的二氧化碳捕集技术。通过吸收进行燃烧后二氧化碳捕集是最容易改造现有装置的技术,但目前这种技术的安装和运行在经济上并不可行。使用离子液体代替胺水溶液克服了主要的热力学问题。通过应用 SILP 技术,在易于处理和吸附动力学方面取得了进一步的进步。初步实验研究表明,离子液体(如脯氨酸四己胺,[N6666][Pro])是利用 SILP 技术吸收二氧化碳的理想候选物质。因此,在使用 0.09 巴二氧化碳(9% CO2 in He)进行的流动实验中,由 40 wt% 的[N6666][Pro]负载在预煅烧二氧化硅上的固体 SILP 吸收剂在每摩尔离子液体的连续吸收-解吸循环中定量吸收了约 1.2 摩尔二氧化碳。