<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Soares, Belinda</style></author><author><style face="normal" font="default" size="100%">Gama, Nuno</style></author><author><style face="normal" font="default" size="100%">Freire, Carmen</style></author><author><style face="normal" font="default" size="100%">Barros-Timmons, Ana</style></author><author><style face="normal" font="default" size="100%">Brandão, Inês</style></author><author><style face="normal" font="default" size="100%">Silva, Rui</style></author><author><style face="normal" font="default" size="100%">Pascoal Neto, Carlos</style></author><author><style face="normal" font="default" size="100%">Ferreira, Artur</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Ecopolyol Production from Industrial Cork Powder via Acid Liquefaction Using Polyhydric Alcohols</style></title><secondary-title><style face="normal" font="default" size="100%">ACS SUSTAINABLE CHEMISTRY &amp; ENGINEERING</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Glycerol</style></keyword><keyword><style  face="normal" font="default" size="100%">Liquefaction process</style></keyword><keyword><style  face="normal" font="default" size="100%">PEG 400</style></keyword><keyword><style  face="normal" font="default" size="100%">Polyols</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">AMER CHEMICAL SOC</style></publisher><pub-location><style face="normal" font="default" size="100%">1155 16TH ST, NW, WASHINGTON, DC 20036 USA</style></pub-location><volume><style face="normal" font="default" size="100%">2</style></volume><pages><style face="normal" font="default" size="100%">846-854</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Ecopolyol production from acid liquefaction of cork powder was studied&lt;br/&gt;for the first time using PEG 400 and glycerol as liquefaction solvents&lt;br/&gt;in the presence of sulfuric acid at moderate temperature and atmospheric&lt;br/&gt;pressure. The effect of the temperature, concentration of catalyst, and&lt;br/&gt;time on the liquefaction yield has been investigated using a fixed set&lt;br/&gt;of reaction conditions namely, a liquefaction solvent mixture/cork&lt;br/&gt;powder ratio of 5/1 and a solvent mixture PEG 400/glycerol ratio of&lt;br/&gt;90/10. The full-factorial design of experiments (DOE) 23 was applied to&lt;br/&gt;obtain an optimized set of liquefaction conditions aiming at minimizing&lt;br/&gt;the residue content. The minimum residue contents experimentally&lt;br/&gt;obtained in this study were 29 wt %, related to cork powder, which were&lt;br/&gt;achieved at 150 C, 4 wt % of sulfuric acid, and 60 min. This value&lt;br/&gt;corresponds to 5 wt % of residue per total mass of reaction product.&lt;br/&gt;The polyols obtained under optimal conditions present similar&lt;br/&gt;characteristics (hydroxyl number value 219 mg(KOH)/g(polyol) and&lt;br/&gt;viscosity 2875 cP, at 25 degrees C) to those of petroleum-based polyols&lt;br/&gt;typically used in the polyurethane foam industry.</style></abstract></record></records></xml>