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Hydrophilic solvent recovery from switched‐on microdroplet dissolution

Droplet 2023年第4期2卷 91-102页

作者： Romain Billet Binglin Zeng Hongyan Wu James Lockhart mike gattrell Hongying Zhao Xuehua Zhang Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaCanada BC Research Inc. RichmondBritish ColumbiaCanada

Switchable hydrophilicity solvents(SHSs)are a unique class of chemical compounds that can be switched between their hydrophobic and hydrophilic *** switchable characteristics allow SHSs to be used as emerging,green solvents for sustainable extraction and separation *** the production of polymeric microparticles from recycled plastics,SHSs are used to dissolve the polymer and then are switched to the hydrophilic form for separation from the generated polymeric ***,it is extremely difficult to fully recover the SHS residue from the *** this work,we will identify the key parameters that determine the level of the solvent residue during the switched‐on dissolution of emulsion *** SHS N,N‐dimethylcyclohexylamine from solvent–polymer binary emulsion droplets was switched to the hydrophilic,water‐soluble form,triggered by addition of an acid in the surrounding aqueous *** applying a sensitive detection method developed in this work,we compared the levels of SHS residue in polymer microparticles obtained under 30 different dynamical and chemical conditions for the switching *** quantitative analysis revealed that residue levels remained constant at varied addition rates and concentration of the trigger solution,but decreased with the increase in organic phase fractions or the decrease in the emulsion *** water in the drops during switched‐on dissolution may have contributed to the high level of solvent *** understanding of the new possible mechanism for residual solvent reported in this work may help develop effective approaches for the recovery of switchable solvents in environmentally friendly separation processes.

关键词： switched residue separation

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