Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

To fulfill this gap and to promote the technology development on CO2 capture in ionic liquids /deep eutectic solvents -based hybrid solvents, this review summarizes the CO2 solubilities and viscosities of IL-based hybrid solvents since 2016 and DES-based hybrid solvents since 2014 to avoid the repetition of the published reviews

Yanrong Liu

2020

Scholarcy highlights

  • CO2 emission is an urgent issue due to its main contribution to global warming
  • The literature survey results of CO2 solubility illustrated that the addition of hybrid solvents to ionic liquids/deep eutectic solvents can significantly enhance the CO2 solubility, and some of the ILs-based hybrid solvents are super to DESs-based hybrid solvents
  • The best hybrid solvents of IL–H2O, IL–organic, IL–amine, DES–H2O, and DES–organic are + H2O, + PEG400, + MEA,-GLY-H2O 1:2:0.11, and-MEA 1:2 + DBN 1:1, respectively. All of these best candidates show higher CO2 solubility than their used pure ILs or DESs, evidencing that IL/DES-based hybrid solvents are remarkable for CO2 capture
  • The results indicate that the CO2 solubility of + H2O first increased from 0.01 to 1 mol/mol at the water contents range of 29–66 mol% and decreased with the increase of water contents of 70–91 mol%
  • The results illustrate that the addition oAf huythborridCsoonlvtreinbtustitoonIsL: sWanridtinDgE—Sosrcigainnadlecdrreaaftseptrheepavriastcioonsi,tyY.aLn.;diennvhesatnigcaetitohne, CZO.D2.,sowluribtiinligt—y. rIeLv–ieawmianned beadsietdingh,yFb.Dri.,dcosnoclevpetnutaslizaarteiosnuapnedrstuopeIrLv–isHio2nO, Xa.Jn. dAlIlLa–uothrograsnhiacv/oerrgeaandiacnadqaugereoeudstosothluetpiounb,lisahnedd vseormsioen oofftthhee ImLa-nbuasscerdipht.ybrid solvents show better performance than that of DES-based hybrid solvents
  • AFdudnidtionng:aTllhy,issowmorekoisf tfhineanILci/aDllEySsuhpypborritdedsoblyveCnatrsl hTaryvgegherigs hSetirftCelOse2fosoulnudbaitliiotnyt.oXtJhtehiarnpkus rthee ILfi/nDanEcSia, linsudpicpaotritnfgrotmhatthethSewaeddisihtiEonnerogfyhAygbernidcys(oNlvoe. nP4t 7t5o0I0L-1/)DaEnSd iKs.pCo. sWsiabnlge EtodudceavtieolnopFogurnedeanteiorna(nNdo. mGoJTreDe-2ffi01c8ie-0n4t).abFsDortbheannktss ftohreCfOin2anccaipaltusruep.pToortdfervomelotphethNeaetffiioncaiel nNt aILtu/rDeESScihenycberidFosuonldvaetniotns foofr CChOin2a ca(2p1t8u0r8e2,2t3h)e. following aspects are suggested for consideration to decrease the viscosity and increase the CCOo2nsfloilcutsboilfitiyn:te(1re)sht:yTbhreidauotfhfourndceticolanraels InLos/cDonEfSlisctthofatinhtearveesth. igh CO2 solubilities with a certain amount of water; the addition of organic solvent which has a small molecular weight to the ILs/DESs; and aRppeflyeirnegncaems ine solvent which has good CO2 capture capacity to ILs and DESs
  • The same phenomenon was observed that the addition of glycerol in these-MEA-based hybrid solvents can decrease the CO2 solubility

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