Enhanced solubility of carbon dioxide for encapsulated ionic liquids in polymeric materials

Encapsulated Ionic Liquids to Enable the Practical Application of Amino Acid-Based Ionic Liquids in CO2 Capture

“…31,32 A more recent alternative is encapsulated ionic liquids (ENILs), materials with a high content of IL inside them due to the central hollow of the porous capsule. 33−44 In recent years, the microencapsulation technique was applied using different polymers 37,40,41 and carbonaceous capsules, 33,38,39,42−44 these being sorbent materials evaluated in CO 2 capture by physical 41,42,44 and chemical absorption 37,39,40,43 in ILs. Recently, we developed ENIL materials formed by hollow carbon submicrospheres (C Cap ) with a diameter between 400 and 700 nm filled by a large amount of IL (up to 80% in weight).…”

“…This work is focused on amino-acid-based ILs (aa-ILs), where safe amino acids were utilized in functionalizing the imidazolium-based IL. , These aa-ILs are particularly promising because of their low cost, abundant availability, and nontoxic biodegradability. − Several papers have reported the high chemical absorption capacity of these aa-ILs − and the limited mass transfer CO 2 rate. , However, CO 2 absorption in aa-ILs presents the kinetic limitations of the CO 2 absorption in aa-ILs due to their high viscosity, especially after reaction with CO 2 , as a result of the CO 2 -complexed aa-ILs forming a salt bridge hydrogen-bonded network, reported by Goodrich et al Therefore, in order to reduce the limitations caused by unfavorable transport properties, two main, different alternatives have been proposed, IL dilution with cosolvents of lower viscosity to overcome the mass transfer limitations of the fluid and the use of a solid phase to immobilize the IL. , Attending to the immobilization of IL, the first approach was SILP materials (supported ionic liquid phase) . SILP consists of spreading the IL on a solid support to increase the mass transfer rate of the CO 2 absorption in ILs, giving high gas–liquid interfacial area and allowing an improvement in the mass transport rates of CO 2 capture in IL, but limited by the maximum amount of IL load in the support. , A more recent alternative is encapsulated ionic liquids (ENILs), materials with a high content of IL inside them due to the central hollow of the porous capsule. − In recent years, the microencapsulation technique was applied using different polymers ,, and carbonaceous capsules, ,,,− these being sorbent materials evaluated in CO 2 capture by physical ,, and chemical absorption ,,, in ILs. Recently, we developed ENIL materials formed by hollow carbon submicrospheres (C Cap ) with a diameter between 400 and 700 nm filled by a large amount of IL (up to 80% in weight) .…”

Engineering encapsulated ionic liquids for next-generation applications

“…The development of encapsulated ILs has emerged as an effective way to overcome these limitations by increasing the gas/liquid contact area and incorporating large amounts of IL in the capsules, thus making it attractive for CO 2 capture. 37,[46][47][48]57,78 As a particular example, Moya et al encapsulated [BMIM][OAc] in hollow carbon microcapsules and provided evidence that the encapsulation did not affect the IL absorption capacity, but signicantly enhanced the mass transfer rate. 47 Additionally, the sorption capacity of the encapsulated ILs was shown to remain unchanged upon successive CO 2 sorption-desorption cycles.…”

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

“…and so on. 105,106 Mohamed et al 107 Compared with the encapsulated conventional ILs, the CO 2 capacity of the encapsulated functionalized ILs was further improved because of the chemical interaction. 111 The encapsulated acetate-based ILs and amino acid ILs (AA-ENILs) are also studied for CO 2 adsorption.…”