Effect of Hot-water and mild alkaline Extraction on Soda-AQ pulping of wheat straw

fereshteh fadavi, hossein resalati, hossein kermanian, mokhtar feizmand


Up to now numerous wood treatments have been conducted mostly in the form of pre-hydrolysis of wood focusing on hemicelluloses pre-extraction for co-production of pulp and chemicals. Our objective in this research was to investigate the effect of hot-water and green liquor pre-extraction of wheat straw on cooking process and papermaking properties of soda-AQ pulp. Wheat straw chips were treated with pure water and green liquor at 140 and 150 °C, respectively, to obtain two levels of pre-extraction weight losses of about 10 and 15 %, in any extraction methods. The pre-extracted straw required less H-factor to cook to the target kappa number of about 20, but required reduced PFI mill refining revolutions. The strength indices of hot-water pre-extracted pulps at both levels of pre-extracted weight losses, and of green liquor pre-extracted pulp only at 10%, were comparable to those of control pulp, except for tear index. 


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