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首页> 外文学位 >Developing a continuous bisulfite postsulfonation process for the black liquor from soda pulping of wheat straw.
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Developing a continuous bisulfite postsulfonation process for the black liquor from soda pulping of wheat straw.

机译：为小麦秸秆的苏打浆制黑液开发连续的亚硫酸氢盐后磺化工艺。

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摘要

Wheat straw is an important non-wood fiber resource. Soda pulping is the most common pulping process for the wheat straw. Due to high silica content, recovery of the black liquor from the soda pulping process has never been economically practiced. The black liquor has traditionally been simply discharged into the nearest receiving water therefore causing a severe environmental impact. With strict environmental control regulations, this old disposal practice can not continue. Converting lignin into lignosulfonates is a viable disposal approach for the black liquor, since lignosulfonates have numerous applications, especially in the agricultural area. It could sustain the utilization of wheat straw as a major non-wood fiber resource in the paper industry.; In this study, a continuous laboratory reactor is designed and built for postsulfonation of the wheat straw soda lignin. With a L9(4 3) orthogonal experimental design, an optimal bisulfite postsulfonation condition is obtained. The optimal continuous bisulfite postsulfonation condition can achieve 64% sulfonation of acid insoluble lignin in black liquor from the soda cooking of wheat straw and reduce the amount of acid insoluble material from 22% to 10% of the black liquor total solids content. It was found that high temperature alkaline pretreatment can completely degrade hemicelluloses into useful carboxylic acids. Additional further work is needed to test the effectiveness of these lignosulfonates in agricultural applications.
机译：小麦秸秆是重要的非木纤维资源。苏打浆是小麦秸秆最常见的制浆过程。由于二氧化硅含量高，从苏打浆过程中回收黑液从未在经济上进行过。传统上，黑液仅被排放到最近的接收水中，因此对环境造成严重影响。有了严格的环境控制法规，这种旧的处置方法将无法继续。将木质素转化为木质素磺酸盐是黑液的一种可行的处置方法，因为木质素磺酸盐具有广泛的应用，尤其是在农业领域。它可以维持小麦秸秆作为造纸行业主要的非木纤维资源的利用。在这项研究中，设计并建造了一个连续的实验室反应器，用于小麦秸秆苏打木质素的后磺化。通过L9（4 3）正交实验设计，获得了最佳的亚硫酸氢盐后磺化条件。最佳的连续亚硫酸氢盐连续磺化条件可以实现麦草汽水蒸煮黑液中酸不溶性木质素的64％磺化，并将酸不溶性物质的含量从黑液总固体含量的22％降低到10％。发现高温碱性预处理可以将半纤维素完全降解为有用的羧酸。需要进一步的工作来测试这些木质素磺酸盐在农业应用中的有效性。

著录项

  • 作者

    Mao, Jingliang.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Agriculture Wood Technology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 森林采运与利用;
  • 关键词

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