A COMBINED PEO FLOCCULATION AND ACIDIFICATION PROCESS FOR LIGNIN REMOVAL FROM PRE-HYDROLYSIS LIQUOR OF MIXED HARWOOD
In pursuing more value-added products, the concept of Integrated Forest Products Biorefinery has received much attention. The mixed hardwood Kraft-based dissolving pulp production process fits into the forest biorefinery well and the focus is to make use of the dissolved organics (hemicelluloses, lignin, acetic acid, among others) in the pre-hydrolysis liquor (PHL). In this study, to effectively separate the dissolved lignin and other components in the PHL, we developed a novel process that combines acidification with PEO flocculation. The results from the turbidity and particle size distribution analyses supported the conclusion that strong interactions occurred between PEO and lignin and the combined acidification/PEO flocculation exhibited some synergistic effect. The explanation is that PEO and lignin, which has many phenolic hydroxiyl groups can develop strong hydrogen bonding capacity, similar to the PEO/Cofactor system used in the paper industry for fines retention. The combined acidification/ PEO flocculation enhanced the lignin removal, as well as COD and color removal. The overall process for utilizing this concept in the separation of dissolved lignocellulosic materials in the PHL, is also discussed.
pre-hydrolysis liquor acidification PEO hardwood lignin
Haiqiang Shi Pedram Fatehi Huining Xiao Yonghao Ni
Liaoning Key Laboratory of Pulp and Paper Engineering, Dalian Polytechnic University. Dalian 116034, Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3,Cana
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
1049-1054
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）