Organosolv pulping. V : Formic acid delignification of Eucalyptus globulus and Eucalyptus grandis

摘要: Abstract Organosolv pulping mediated by formic acid was evaluated. Wood of Eucalyptus globulus and grandis cooked with under different conditions solvent ratio (formic acid: water), catalyst concentration, temperature time treatment. For E. , the best results for sawdust samples were obtained at 90°C after 90 min cooking, a 80:20 ( vv −1 ), charge (wood:solvent ratio) 1:30 0·44% (vv ) catalyst. In case chips, concentration used 0·22%, 1:10, soaking preheating used. sample soaked in water 72 h, pulp yield 56%, Kappa number 22 reject content 1·6% wood needed more drastic conditions. Cooking chips (99%) 95°C, 0·22% catalyst, resulted 43%. The 31, 0·1% cellulose Klason lignin contents 88% 8%, respectively.