STUDY ON THE DETRIMENTAL SUBSTANCES IN MASSON PINE BCTMP PROCESS WATERS
The components of detrimental substances in Masson pine BCTMP process waters were analyzed qualitatively and quantitatively using GC/MS. Results showed that solvent (methyl tert-butyl ether) extractable portion of the detrimental substances was mainly composed of dehydroabietic acid (14.77％), abietic acid (11.17％), linoleic acid (10.19％), and oleic acid (9.54％). Considerable amounts of water soluble pectic substances were detected in process waters, although galacto- glucomannans was the dominant Meanwhile, the release mechanism of detrimental substances from Masson pine chips and pulps was investigated. It was found that screw press extruded the wood resins from chips non-selectively, while during chemical treatment and latency processes, fatty acids were more easily released into the process water from fibers than resin acids. Release of detrimental substances from CTMP pulps was strongly affected by the initial pH value of the suspension. As the pH value was above 8.0, especially at peroxide bleaching stage, much more wood resins and pectic substance were released, leading to the increase of turbidity and cationic demand value of detrimental substances. Polygalacturonic acid (pectics) was found to be the major contributor to the CD (cationic demands) value of water samples.
detrimental substances release mechanism Masson pine process waters
Chunhui Zhang Huaiyu Zhan Shiyu Fu
State Key Lab. of Pulp and Paper Engineering, South China University of Technology, Guangzhou, P. R. China,510640
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1182-1186
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）