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Surface sediments formation during auto-hydrolysis and its effects on the benzene-alcohol extractive, absorbability and chemical pulping properties of hydrolyzed acacia wood chips

Shi, Haiqiang, Zhou, Miaofang, Li, Chao, Sheng, Xueru, Yang, Qian, Li, Na, Niu, Meihong
Bioresource technology 2019 v.289 pp. 121604
Acacia, autohydrolysis, kraft pulping, lignin content, pulp, sediments, wood chips
The aim of this work was to study the sedimentary substances formed on the surface of auto-hydrolyzed wood chips. And its potential effect on the subsequent chemical pulping was then investigated by the analysis of surface morphology, benzene-alcohol extractive, absorbability and kraft pulping of wood chips hydrolyzed. The results showed that sediments on the surface of auto-hydrolyzed wood chips were microspheric and the amount of them increased with intensifying the severity of treatment. The benzene-alcohol extractives and lignin content in the extractives increased from 1.36% and 16.42% in the control sample to 9.42% and 47.68% in the hydrolyzed wood chips at the P-factor of 808. The absorbability of hydrolyzed wood chips firstly improved in the early stage (P-factor < 306) and after then decreased. Negative effect of the sediments on the surface of hydrolyzed wood chips was found on the subsequent kraft chemical pulping and the properties of final pulp.