ISOLATION OF HEMICELLULSOES FROM THE PRE-HYDROLYSIS OF KRAFT PULPING METHOD USING TWO ALTERNATIVE APPROACHES
Hemicelluloses are the raw materials for the production of various value-added products. In this work, the isolation of hemicelluloses from the prehydrolysis liquor (PHL) of the kraft-based dissolving pulp production process was evaluated in two alternative pathways. In one method, PHL was first acidified to a pH of 2 for removing lignin, and then hemicelluloses were isolated using ethanol with a ratio of 4:1 (v/v). It was found that the hemicelluloses and lignin contents of the isolated hemicelluloses samples were 86.25％ and 0.44％, respectively, which confirmed the high selectivity of this method for isolating hemicelluloses. Additionally, xylose/xylan was the predominant sugar component (46.7％) of the hemicelluloses isolated. In another method, ethanol was directly applied to PHL for isolating hemicelluloses. Then, different ECF bleaching steps were applied on the isolated hemicelluloses to further purify the hemicelluloses isolated. It was evident that the hemicelluloses content was about 81％ of the total solid, while the lignin content is about 5％. Furthermore, the hemicelluloses content, and the lignin content were reduced in each stage of the subsequent bleaching process.
hemicelluloses biorefinery pre-hydrolysis isolation ethanol extraction
Zehua Liu Pedram Fatehi Yonghao Ni
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300 Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3,Can
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
813-816
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）