Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
Bioresour Technol. 2016 Apr;206:225-230. doi: 10.1016/j.biortech.2016.01.107. Epub 2016 Feb 3.
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.
提出了石灰处理和混合床离子交换相结合的工艺，从木质纤维素的预水解液（PHL）中分离出半纤维素衍生的糖（HDS）作为增值产品。石灰处理的优化实现了高达 44.2%的非糖有机物（NSOC）去除率，主要是胶体物质，在 0.5%的石灰水平下，HDS 降解可忽略不计，随后用磷酸中和。混合床离子交换去除石灰处理后的 PHL 中的残留 NSOC 和钙离子。HDS 和 NSOC 的穿透曲线对 NSOC 表现出选择性保留，在 17 倍床体积交换容量下，HDS 的回收率为 75%，纯度为 95%。此外，大孔树脂的交换容量高于凝胶树脂，这表明三处理体积的交换容量更高。该联合工艺的显著选择性表明了从 PHL 中分离 HDS 的可行性。
