Fig. 4From: Delignification of softwood by glycerol from biodiesel by-product I: model reaction using glycerol and fatty acid sodium soap mixture for pretreatment on bioethanol productionChanges in chemical composition of different biomasses treated with 20% sodium oleate in glycerol at 250 °C for 1 h. White area, ɑ-cellulose; hatched area, hemicellulose and alkali-soluble cellulose; gray areas, Klason ligninBack to article page