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|Type:||Artigo de periódico|
|Title:||Organosolv Pulping. Viii. Formic Acid Delignification Of Pinus Radiata D. Don|
|Abstract:||The aim of this study was to optimize the organosolv cooking system involving formic acid as a cooking agent. The wood raw material used was Pinus radiata D. Don sawdust and the cooks were performed on a small scale using 3 g o.d. sawdust in 100 mL of solvent. The effects of solvent ratio and catalyst on delignification were studied in order to optimize the process. A delignification yield of 65% was afforded with the sawdust, the cellulosic material exhibiting 90.5% cellulose, 1.2% hemicellulose and 8.3% Klason lignin, catalyzed with 0.018% of HCl. Several delignification parameters were studied; among them, presoaking with NaHCO3 of Pinus radiata chips catalyzed with 0.018% HCl at 98% formic acid for 3 h, gave a low reject value, Kappa number of around 60 and a 67% pulp yield. Cellulose and Klason lignin of 79.5% and 11% were afforded, respectively. A preliminary pulp evaluation indicated that, at the same freeness of 42 °SR, a 25% less energy than in Kraft refining resulted. However, the formic pulp exhibited around 50% of the tear and burst indexes of those of Kraft pulp.|
|Editor:||Editura Acad Romane, Bucharest, Romania|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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