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Title

EFFECTS OF WASHING METHOD ON THE BAGASSE PULPING CHARACTERISTICS BY SULFUR DIOXIDE- ETHANOL-WATER (SEW) PROCESS

Pages

 Start Page 549 | End Page 559

Keywords

SO2-ETHANOL-WATER (SEW)Q1

Abstract

 SO2-ethanol-water (SEW) PULPING can be considered a hybrid between solvent and acid sulfite PULPING processes. Recently, this process has been paid attention to separate the principal components of lignocellulosic materials i.e. cellulose, hemicelluloses and lignin. The main objective of this study was to investigate the effects of WASHING METHOD on the bagasse PULPING characteristics processed by the acidic fractionation of sulfur dioxide-ethanol-water (SEW) method. Variables included two washing pulp methods (water and 40 v/v% ethanol-water solutions), PULPING duration (30-100 min.), and temperature (120 and 135 OC). Then, pulps were washed twice with 40% v/v ethanol-water at 60oC (L: W 2 L kg-1) and with deionized water at room temperature (L: W 20 L kg-1). The results showed that the final pulp yield decreased due to the greater solubility of lignin in 40 v/v % ethanol-water compared with the conventional systems (washing by water). This decrease was statistically significant at the level of 1%. PULPING result at 120 and 135oC at different time periods showed that with an increase in the PULPING duration, KAPPA NUMBER is reduced.

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