超临界氨萃取技术在制浆造纸方面的研究

The Research of Supercritical Ammonia Extraction Technic in Pulping and Paper Makeing

该文以竹子、木材为原料,以氨水为流体,采用超临界萃取技术进行木质素的提取和制浆造纸实验,讨论了不同温度和压力对木质素的脱除度的影响以及纸张性能随温度和压力的变化情况。对纸浆卡伯值和纸张性能的综合检测结果表明:当氨水与木材或竹材质量比为5:1,温度170℃,压力2～3MPa,反应时间1h,此时木质素的脱除效果最佳。采用此技术进行制浆造纸实验,其成纸可达到工业及文化用纸的要求。制浆废液可作为含氮和钾的有机肥来使用,或根据去氨的程度应用于化工原料行业。

The extraction of lignin and experiment of pulping and papermaking were studied by using supercritical ammonia extraction technic with bamboo and wood as material and ammonia as fluid. The effect of temperature and pressure on the delignification and paper property by changing the reaction temperature and pressure was discussed. It was indicated that the effect of delignification was best when the weight ratio of ammonia and wood or bamboo was 5：1, the temperature was 170℃, the pressure was 2-3 MPa, and the reaction time was 1h. It was concluded that the paper produced by using this method could satisfy the demand of industrial and cultural paper. The pulping waste could be used as nitrogen and potash fertilizer or chemical material according to the degree of eliminating ammonia.