RT Journal Article
T1 Efficiency of hydrophobic phosphonium ionic liquids and DMSO as recyclable cellulose dissolution and regeneration media
A1 Holding, Ashley J.
A1 Parviainen, Arno
A1 Kilpeläinen, Ilkka
A1 Soto Campos, Ana María
A1 Rodríguez Martínez, Héctor
AB Hydrophobic, long-chain tetraalkylphosphonium acetate salts (ionic liquids) were combined with a dipolar aprotic co-solvent, dimethylsulfoxide (DMSO), and the feasibility of these solvent systems for cellulose dissolution and regeneration was studied. A 60 : 40 w/w mixture of the ionic liquid tetraoctylphosphonium acetate ([P8888][OAc]) and DMSO was found to dissolve up to 8 wt% cellulose, whilst trioctyl(tetradecyl)phosphonium acetate ([P14888][OAc]) dissolved up to 3 wt% cellulose. Water (an anti-solvent for cellulose) was found to give rise to biphasic liquid–liquid systems when combined with these mixtures, yielding an upper phase rich in ionic liquid and a lower aqueous phase. The liquid–liquid equilibria of the ternary systems were experimentally determined, finding that DMSO strongly partitioned towards the aqueous phase. Thus, a process scheme involving simultaneous regeneration of cellulose and recycling of the solvent system was envisioned, and demonstrated on a large scale using [P8888][OAc]. A large portion of the ionic liquid (ca. 60 wt%) was directly recovered via phase separation, with a further 37 wt% being recovered from the swollen cellulose phase and residual materials, bringing recovery to 97%. XRD analysis of the recovered cellulose materials showed a loss of crystallinity and conversion from Cellulose I to Cellulose II. Non-dissolving compositions of ionic liquid and DMSO did not affect cellulose crystallinity after cellulose pulp treatment
PB Royal Society of Chemistry
YR 2017
FD 2017
LK http://hdl.handle.net/10347/23010
UL http://hdl.handle.net/10347/23010
LA eng
NO Holding, A., Parviainen, A., Kilpeläinen, I., Soto, A., King, A., & Rodríguez, H. (2017). Efficiency of hydrophobic phosphonium ionic liquids and DMSO as recyclable cellulose dissolution and regeneration media. RSC Advances, 7(28), 17451-17461. doi: 10.1039/c7ra01662j
NO We would like to thank COST for the Short Term Scientific Mission funding under the EXIL (Exchange on Ionic Liquids) action and CLIC Innovation Oy for the continued funding under the ACel program
DS Minerva
RD 28 abr 2026