Residual extractives in aspen kraft pulps and their impact on kappa number and Klason lignin determination |
| |
Authors: | Soo-Jeong Shin Nam-Seok Cho Yuan-Zong Lai |
| |
Institution: | (1) Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF), New York, 13210, USA;(2) Wood and Paper Science, School of Forest Resources, and Rural Engineering, Chungbuk National University, Cheongju, Chungbuk, 361-763, Korea;(3) Present address: Wood and Paper Science, School of Forest Resources and Rural Engineering, Chungbuk National University, Chungbuk, 361-763, Korea |
| |
Abstract: | We investigated the impact of residual extractives on lignin determination by lignin content difference between unextracted
and extracted pulps, residual extractives analysis, and lignin content contribution from model extractive compounds. There
were two different kinds of extractives in aspen kraft pulp. The extractives impacting on kappa number determination were
well removed in oxygen delignification; these were mainly unsaturated fatty acids. However, the extractives impacting on Klason
lignin determination were largely resistant to oxygen delignification; these were mainly saturated fatty acids, sterols, and
hydrocarbons. Oxidation of unsaturated fatty acids was the main reaction in oxygen delignification. These trends were confirmed
by simulation of lignin content determination with three model extractive compounds (β-sitosterol, linoleic acid, and palmitic acid).
The publication of this article was made possible by an Emachu Research Fund. The authors are grateful for the fund. |
| |
Keywords: | Extractives Kraft pulps Oxygen-delignified pulps Kappa number Klason lignin |
本文献已被 SpringerLink 等数据库收录! |
|