Ecopolyol Production from Industrial Cork Powder via Acid Liquefaction Using Polyhydric Alcohols
authors Soares, B; Gama, N; Freire, C; Barros-Timmons, A; Brandao, I; Silva, R; Neto, CP; Ferreira, A
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords Polyols; PEG 400; Glycerol; Liquefaction process; Cork powder; Quercus suber L.; Biorefinery; Statistical design of experiments (DOE)
keywords RIGID POLYURETHANE FOAM; LIQUEFIED WOOD; WHEAT-STRAW; POLYOL; RESIDUES; BIOPOLYOLS; GLYCEROL; LIGNIN
abstract Ecopolyol production from acid liquefaction of cork powder was studied for the first time using PEG 400 and glycerol as liquefaction solvents in the presence of sulfuric acid at moderate temperature and atmospheric pressure. The effect of the temperature, concentration of catalyst, and time on the liquefaction yield has been investigated using a fixed set of reaction conditions namely, a liquefaction solvent mixture/cork powder ratio of 5/1 and a solvent mixture PEG 400/glycerol ratio of 90/10. The full-factorial design of experiments (DOE) 23 was applied to obtain an optimized set of liquefaction conditions aiming at minimizing the residue content. The minimum residue contents experimentally obtained in this study were 29 wt %, related to cork powder, which were achieved at 150 C, 4 wt % of sulfuric acid, and 60 min. This value corresponds to 5 wt % of residue per total mass of reaction product. The polyols obtained under optimal conditions present similar characteristics (hydroxyl number value 219 mg(KOH)/g(polyol) and viscosity 2875 cP, at 25 degrees C) to those of petroleum-based polyols typically used in the polyurethane foam industry.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2014
volume 2
issue 4
beginning page 846
ending page 854
digital object identifier (doi) 10.1021/sc400488c
web of science category Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000334092600038

Sponsors

1suponsers_list_ciceco.jpg