title: Separation of hemicellulose-derived saccharides from wood hydrolysate by lime and ion exchange resin.
abstract: A combined process of lime treatment and mixed bed ion exchange was proposed to separate hemicellulose-derived saccharides (HDS) from prehydrolysis liquor (PHL) of lignocellulose as value added products. The optimization of lime treatment achieved up to 44.2% removal of non-saccharide organic compounds (NSOC), mainly colloidal substances, with negligible HDS degradation at 0.5% lime level and subsequent neutralization by phosphoric acid. The residual NSOC and calcium ions in lime-treated PHL were eliminated by mixed bed ion exchange. The breakthrough curves of HDS and NSOC showed selective retention toward NSOC, leading to 75% HDS recovery with 95% purity at 17 bed volumes of exchange capacity. In addition, macroporous resin showed higher exchange capacity than gel resin as indicated by the triple processing volume. The remarkable selectivity of the combined process suggested the feasibility for HDS separation from PHL.
authors: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors: Xiaojun
authors: X
authors: Wang
authors: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors: Jingshun
authors: J
authors: Zhuang
authors: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors: Yingjuan
authors: Y
authors: Fu
authors: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors: Guoyu
authors: G
authors: Tian
authors: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China. Electronic address: wzj@qlu.edu.cn.
authors: Zhaojiang
authors: Z
authors: Wang
authors: Laboratory of Organic Chemistry, Taishan University, Taian 271021, China.
authors: Menghua
authors: M
authors: Qin
mesh_terms: D000327:Adsorption; D017610:Calcium Compounds / Q000737:chemistry*; D002498:Centrifugation; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007474:Ion Exchange; D007475:Ion Exchange Resins / Q000737:chemistry*; D009844:Oligosaccharides / Q000302:isolation & purification*; D010087:Oxides / Q000737:chemistry*; D011134:Polysaccharides / Q000302:isolation & purification*; D014934:Wood / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D007475:Ion Exchange Resins; D009844:Oligosaccharides; D010087:Oxides; D011134:Polysaccharides; C007916:hemicellulose; C016538:lime
keywords: Hemicellulose; Hydrolysis; Lignin; Purification; Saccharide