3 documents found, page 1 of 1
Rigid polyurethane foams derived from cork liquefied at atmospheric pressure
Gama, Nuno V.; Soares, Belinda; Freire, Carmen S. R.; Silva, Rui; Brandao, Ines; Pascoal Neto, C.; Barros-Timmons, Ana; Ferreira, ArturThe aim of this study was to evaluate the possibility of using polyols derived from liquefied cork in the production of novel bio-based polyurethane foams (PUFs). For that purpose, different liquefaction conditions were used at atmospheric pressure and moderate temperature where poly(ethylene glycol) and glycerol were used as solvents and sulfuric acid as catalyst. The ensuing polyols were used to produce foams...
Spent coffee grounds as a renewable source for ecopolyols production
Soares, Belinda; Gama, Nuno; Freire, Carmen S. R.; Barros-Timmons, Ana; Brandao, Ines; Silva, Rui; Pascoal Neto, Carlos; Ferreira, ArturBACKGROUNDBased on the biorefinery concept, the main focus of this work was the increase in value of spent coffee grounds via an acid liquefaction process using polyhydric solvents in the presence of sulfuric acid, at moderate temperature. For that purpose the effect of temperature, sulfuric acid concentration and time on biomass conversion was studied using design of experiments combined with statistical analy...
Ecopolyol Production from Industrial Cork Powder via Acid Liquefaction Using Po...
Soares, Belinda; Gama, Nuno; Freire, Carmen; Barros-Timmons, Ana; Brandao, Ines; Silva, Rui; Pascoal Neto, Carlos; Ferreira, ArturEcopolyol 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 mi...