HEMICELLULOSES PRE-EXTRACTION WITH ALKALI FROM ASPEN CHIPS PRIOR TO MECHANICAL PULPING
The potential of pre-extracting hemicelluloses from aspen chips before mechanical pulping was investigated in this study. The effects of three independent process variables (NaOH charge, pre-extraction temperature and time) on three dependent variables (‘pulping’ yield, xylan extraction yield, and cellulose content in ‘pulps’) were studied using Box-Behnken experimental design. Mathematical model of xylan extraction yield was obtained and verified. It was found that NaOH charge, time, interaction between NaOH charge and time as well as interaction between temperature and time have significant effects on xylan extraction yield. The xylan extraction yield was 22.6％, i.e., about 37.20kg of xylan could be extracted from one ton of oven-dried aspen chips under the conditions of 5.68％ NaOH, 100 °C and 35min.
Hemicelluloses Pre-extraction Xylan extraction yield Mechanical pulping
Wei Liu Zhirun Yuan Changbin Mao Qingxi Hou Kecheng Li
Tianjin Key Laboratory of Pulp & Paper,Tianjin University of Science&Technology, Tianjin,China 30045 FPInnovations,Pointe-Claire, QC,Canada H9R 3J9 Tianjin Key Laboratory of Pulp & Paper,Tianjin University of Science&Technology, Tianjin,China 30045 Department of Chemical Engineering, University of New Brunswick,Fredericton,NB, Canada E3B 5A3
国际会议
International Mechanical Pulping Conference 2011(2011国际机械浆学术会议)
西安
英文
152-156
2011-06-26（万方平台首次上网日期，不代表论文的发表时间）