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首页> 美国卫生研究院文献>Materials >Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production
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Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

机译：桉树纸浆制浆纸浆有机酸预处理的比较评价

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摘要

Pretreatment is an essential process for the extensive utilization of lignocellulose materials. The effect of four common organic acid pretreatments for Kraft dissolving pulp production was comparatively investigated. It was found that under acidic conditions, hemicellulose can be effectively removed and more reducing sugars can be recovered. During acetic acid pretreatment, lignin that was dissolved in acetic acid could form a lignin-related film which would alleviate cellulose hydrolysis, while other organic acids caused severe cellulose degradation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were used to characterize the pretreated chips in the process. Lignin droplets were attached to the surface of the treated wood chips according to the SEM results. The FTIR spectrum showed that the lignin peak signal becomes stronger, and the hemicellulose peak signal becomes weaker with acid pretreatment. The XRD spectrum demonstrated that the crystallinity index of the wood chips increased. The acetic acid pretreatment process-assisted Kraft process achieved higher yield (31.66%) and higher α-cellulose (98.28%) than any other organic acid pretreatment. Furthermore, extensive utilization of biomass was evaluated with the acetic acid pretreatment-assisted Kraft process. 43.8% polysaccharide (12.14% reducing sugar and 31.66% dissolving pulp) and 22.24% lignin (0.29% acetic acid lignin and 21.95% sulfate lignin) were recovered during the process. Biomass utilization could reach 66.04%. Acetic acid pretreatment is a promising process for extensive biomass utilization.
机译：预处理是广泛利用木质纤维素材料的重要过程。比较研究了四种常见有机酸预处理对牛皮纸溶解纸浆生产的影响。已经发现，在酸性条件下，半纤维素可以被有效地除去，并且可以回收更多的还原糖。在乙酸预处理过程中，溶解在乙酸中的木质素会形成木质素相关薄膜，从而减轻纤维素水解，而其他有机酸则导致纤维素严重降解。使用扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR）和X射线衍射仪（XRD）表征了该工艺中的预处理芯片。根据SEM结果，木质素液滴附着到处理过的木屑的表面上。 FTIR光谱表明，用酸预处理木质素峰信号变强，而半纤维素峰信号变弱。 XRD谱表明木片的结晶度指数增加。与其他有机酸预处理相比，乙酸预处理工艺辅助的Kraft工艺可实现更高的收率（31.66％）和更高的α-纤维素（98.28％）。此外，利用乙酸预处理辅助的牛皮纸工艺评估了生物质的广泛利用。在该过程中回收了43.8％的多糖（12.14％的还原糖和31.66％的溶解纸浆）和22.24％的木质素（0.29％的乙酸木质素和21.95％的硫酸木质素）。生物质利用率可以达到66.04％。乙酸预处理是广泛利用生物质的有前途的方法。

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