authors |
Morais, ES; Schaeffer, N; Freire, MG; Freire, CSR; Coutinho, JAP; Silvestre, AJD |
nationality |
International |
journal |
ACS SUSTAINABLE CHEMISTRY & ENGINEERING |
author keywords |
xylans; aqueous biphasic systems; ionic liquids; furfural; microwave heating; acidic catalysis |
keywords |
DEEP EUTECTIC SOLVENT; LIGNOCELLULOSIC BIOMASS; IONIC-LIQUID; CONVERSION; XYLAN; XYLOSE; MEDIA; EXTRACTION; CATALYST; STRAW |
abstract |
An integrated platform for furfural production and separation from xylans using an acidic aqueous biphasic system (AcABS) is described here. The AcABS is composed of the ionic liquid (IL) tributyltetradecylphosphonium chloride ([P444(14)]Cl) and hydrochloric acid (HCl), the latter acting both as a catalyst and phase-forming agent. Furfural is produced in the AcABS biphasic regime under microwave irradiation, being continuously extracted to the IL-rich phase. Operating conditions (reaction time, temperature, HCl and IL wt %, and solid/liquid ratio) were initially screened to identify the most relevant parameters affecting furfural production, being optimized using a response surface methodology approach. A maximum furfural yield of 78.8% and an extraction efficiency to the IL-rich phase of 85.5% were attained in 1 min in the microwave reactor, at 140 degrees C and 0.05 S/L ratio, with the ABS formed by 30 wt % IL and 6.5 wt % HCl. Three reaction cycles were performed by reusing the IL, in which 78.0% of furfural could be recovered from the IL-rich phase in all the reaction cycles, without compromising the furfural yield and extraction efficiency. This work demonstrates the potential of acidic-based aqueous biphasic systems as one-step production-separation strategies of high-value platform chemicals, paving the way toward sustainable development within biorefineries. |
publisher |
AMER CHEMICAL SOC |
issn |
2168-0485 |
year published |
2021 |
volume |
9 |
issue |
36 |
beginning page |
12205 |
ending page |
12212 |
digital object identifier (doi) |
10.1021/acssuschemeng.1c03733 |
web of science category |
8 |
subject category |
Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical |
unique article identifier |
WOS:000696378200017
|