Zhang Zhaofu, Liu Shuaishuai, Ma Jun, Wu Tianbin
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2021 Apr 28;11(26):15748-15752. doi: 10.1039/d1ra01268a. eCollection 2021 Apr 26.
In terms of CO capture and storage (CCS), it is highly desired to substitute of high efficiency process for the applied one which is far from the ideal one. Physical processes cannot capture CO effectively, meanwhile CO desorption is energy-intensive in chemical processes. Herein, a depth-suitable and water-stable trap for CO capture was discovered. Carboxylates can react with polybasic acid roots by forming united hydrogen bonds. Carboxylate ionic liquid (IL) aqueous solutions can absorb one equimolar CO chemically under ambient pressure, and its CO desorption is easy, similar to that in physical absorption/desorption processes. When used as aqueous solutions, carboxylate ILs can replace alkanolamines directly in the applied CCS process, and the efficiency is enhanced significantly due to the low regenerating temperature. CO (or polybasic acids) can be used as a polarity switch for ILs and surfactants. A new method for producing carboxylate ILs is also proposed.
在二氧化碳捕集与封存（CCS）方面，人们迫切希望用高效工艺替代现有的、远非理想的工艺。物理过程无法有效捕集二氧化碳，同时化学过程中的二氧化碳解吸能耗很大。在此，发现了一种深度适宜且对水稳定的用于二氧化碳捕集的捕集剂。羧酸盐可通过形成联合氢键与多元酸根发生反应。羧酸盐离子液体（IL）水溶液在常压下能化学吸收一摩尔当量的二氧化碳，且其二氧化碳解吸容易，类似于物理吸收/解吸过程。当用作水溶液时，羧酸盐离子液体可在应用的CCS工艺中直接替代链烷醇胺，并且由于再生温度低，效率显著提高。二氧化碳（或多元酸）可用作离子液体和表面活性剂的极性开关。还提出了一种制备羧酸盐离子液体的新方法。
