生物法提取桑皮纤维漂白工艺的研究与优化

Optimization of bleaching technology for mulberry fiber by bio-extraction

【目的】研究生物法提取桑皮纤维的最佳漂白工艺。【方法】采用回归正交组合设计,研究了碱(NaOH)用量、漂白剂(H2O2)用量、水料比、漂白温度及漂白时间对生物法提取桑皮纤维漂白的技术参数。【结果】(1)各因子对纤维白度的影响程度依次为:漂白温度>漂白时间>碱用量>漂白剂用量>水料比,漂白温度是漂白过程中的关键控制因素。(2)因子交互效应分析显示,碱用量与漂白温度、漂白剂用量与漂白时间、料水比与漂白时间通过互作产生了增白效应。【结论】通过对纤维白度模型的优化,得到的最佳漂白工艺参数为:碱用量2.05 g/L,漂白剂用量6%,水料比16.7∶1,漂白温度112℃,漂白时间125 min。在最佳工艺参数条件下,纤维白度可达75.0以上,经反复试验验证,该工艺正确可行。

[Objective] The bleaching technology for mulberry fiber by bio-extraction was studied and the technological conditions were optimized. [Method] The effects of NaOH, H2 O2, temperature, time, and the ratio of water/fiber on the bleaching of mulberry fiber by bio-extraction was studied. A mathematical model of the relationship for these factors with fiber whiteness was established by using the five-way quadratic orthogonal regression design. [Result] （1）The effects of five factors on the fiber whiteness were： bleaching temperature〉bleaching time〉dosage of NaOH 〉dosage of H2O2 〉 ratio of water to material, and bleaching temperature was the main factor influencing the fiber whiteness; （2） The factor interaction analysis suggested that the interaction of dosage of NaOH and bleaching temperature, dosage of H2O2 and bleaching time, ratio of water to material and bleaching time increased the fiber whiteness effectively. [Conclusion] The optimum technological parameters were：NaOH 2.05 g/L, H2O2 6% ,ratio of water to material 16. 7 ： 1, temperature 112 ℃,and bleaching time 125 min, the fiber whiteness in the optimized fiber whiteness model reached above 75.0. It was identified correct and feasible by repeated experiment.