竹片化学机械法提取木聚糖及残余物抄纸利用研究

Xylan Extraction from Bamboo by Chemi-mechanical Method and Papermaking of the Residues

关键词:  竹片  PFI磨  碱处理  木聚糖  纸张性能

Key Words:bamboo  PFI mill  alkali treatment  xylan  paper properties

摘要:为实现竹原料的综合利用，探索通过化学机械法提取木聚糖，并对残余物进行抄纸利用研究。结果表明，化学机械法木聚糖提取的较佳工艺条件为：竹片以35%的进料浓度螺旋挤压4次后，采用用碱量6%、液比1∶4、常温下浸渍90 min后，调节用碱量为80%（碱浓10%），液比为1∶8，通过转数为5000的PFI磨（进刀间距为0.1 mm）处理后，最后在高压灭菌锅中于125℃下保温处理45 min，木聚糖得率达到85.1%。通过傅里叶变换红外光谱仪（FT-IR）、核磁共振波谱仪（¹H NMR）分析表明，所得粗木聚糖主成分是木聚糖，还含有少量阿拉伯糖、葡萄糖醛酸等；提取木聚糖后的残余物所抄纸张的强度性能指标达到箱纸板国家标准GB/T 13024—2016中合格品的要求。

Abstract:In order to realize the comprehensive utilization of bamboo raw materials， using of chemi-mechanical method to extract xylan and the residues for papermaking was explored. The results showed that the optimal process conditions for the extraction of xylan by chemi-mechanical method were as follows. The bamboo chips treated by the screw press for 4 times in 35% consistency， then impregnated with alkali（6% dosage） solution（liquid/mass ratio 4∶1） for 90 min under room temperature， adjusted again the amount of alkaline to 80%（the alkali concentration was 10%） and the liquid ratio to 1∶8.Then the stock was pass through the PFI mill with a PFI mill rotation speed of 5000 （infeed distance of 0.1 mm）. Finally it was heat-treated in an autoclave with a temperature of 125℃ for 45 min. The yield of xylan reached 85.1%. The crude xylan was analyzed by FT-IR and ¹H NMR， whose results showed that the crude xylan contained arabinose， glucuronic acid besides xylan. The results of papermaking experiment using the bamboo residues showed that the residue after extracting xylan could be used for papermaking， and the paper sample could meet the strength performance index of qualified cardboard paper products in the national standard GB/T 13024—2016.