以葡萄枝为原料,采用磷钨酸预水解法制备硫酸盐预水解浆

Li Tao, Maying Hua, Zhang JUN KE
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引用次数: 1

摘要

以葡萄枝为原料,采用磷钨酸(PTA)预水解硫酸盐(PHK)蒸煮和无氯(ECF)漂白法制备溶解浆。通过正交试验研究了预水解温度、反应时间和PTA浓度对溶解纸浆化学成分的影响。木质素的结构在PTA预水解阶段被激活,木质素在随后的蒸煮过程中很容易被去除。因此,相对温和的条件(140°C, 100分钟)可用于烹饪过程。在预水解阶段,温度对纸浆纤维纯度的影响最大,其次是反应时间和PTA浓度。优化预水解条件为:预水解温度145℃;反应时间:75 min;PTA浓度为1wt %。无论是过高的预水解温度还是延长反应时间都不利于长链纤维素的保留,过量的PTA负荷不能进一步提高蒸煮过程的脱木质素选择性。在此预水解条件下,经蒸煮和漂白后,α-纤维素含量和总得率分别可达94.1%和29.0%。通过傅里叶变换红外光谱(FTIR)和x射线衍射(XRD)分析,证实了PTA预水解后纤维素的化学结构和晶型基本没有变化。在相对温和的蒸煮条件下,PTA预水解可作为制备PHK溶解浆的替代方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparing prehydrolyzed kraft dissolving pulp via phosphotungstic acid prehydrolysis from grape branches
Dissolving pulp was successfully prepared via phosphotungstic acid (PTA) prehydrolysis kraft (PHK) cooking followed by an elemental chlorine-free (ECF) bleaching process from grape branches. The effects of prehydrolysis temperature, reaction time, and PTA concentration that potentially affect the quality of dissolving pulp product on chemical components of pulp were studied via an orthogonal experiment. The structure of lignin was activated during the PTA prehydrolysis phase, and lignin was easily removed during the following cooking process. Thus, relatively mild conditions (140°C, 100 min) can be used in the cooking process. During the prehydrolysis phase, temperature exhibited the most significant influence on the cellulose purity of the obtained pulp fiber, followed by reaction time and PTA concentration. The optimized prehydrolysis conditions were as follows: prehydrolysis temperature, 145°C; reaction time, 75 min; and PTA concentration, 1 wt%. Whether the excessively high prehydrolysis temperature or prolonging the reaction time did not favor the retention of long chain cellulose, the delignification selectivity for the cooking process could not be further improved by excessive PTA loading. Under these prehydrolysis conditions, 94.1% and 29.0% for α-cellulose content and total yield could be achieved after the given cooking and bleaching conditions, respectively. Moreover, the chemical structure and crystal form of cellulose were scarcely changed after PTA prehydrolysis, which could be confirmed by results from Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). PTA prehydrolysis could be considered as an alternative method for preparing PHK dissolving pulp under relatively mild cooking conditions.
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