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利用粗木质素-果胶复合制剂进行环保的麦草制浆,用于生产高质量纸张。

Eco-friendly pulping of wheat straw using crude xylano-pectinolytic concoction for manufacturing good quality paper.

机构信息

Department of Biotechnology, Kurukshetra University, Kurukshetra, India.

Avantha Center for Industrial Research and Development, Paper Mill Campus, Yamuna Nagar, India.

出版信息

Environ Sci Pollut Res Int. 2020 Sep;27(27):34574-34582. doi: 10.1007/s11356-020-10119-1. Epub 2020 Jul 17.


DOI:10.1007/s11356-020-10119-1
PMID:32681331
Abstract

In this study, suitability of xylano-pectinolytic enzymes in pulping of wheat straw has been explored. The suitable biopulping conditions were optimized, with xylanase dose of 400 and pectinase dose of 120 IU/g wheat straw, 1:10 (g/ml) material to liquid ratio, 55 °C temperature, 3 h treatment time, 0.75% Tween 80 and pH 8.5. Enzymatic pretreatment efficiently increased the pulpability of wheat straw, generated pulp with higher yield, lower kappa number (15.67%) and rejections (59.65%) in comparison with chemical pulp. The brightness of pretreated wheat straw pulp with enzyme was 16.04% higher than that of the non-enzyme treated wheat straw pulp. The biopulping resulted in 12% reduction of pulping chemicals along with more residual alkali content, in order to achieve similar optical and chemical properties as obtained by 100% chemically treated pulp. Physical properties of pulp also improved after enzymatic pretreatment, increasing burst index (26.50%), tear index (18.22%) and breaking length (5.56%). The enzyme plus chemical (88% pulping chemicals) treated pulp showed improvement in brightness and whiteness, with reduction in yellowness at all bleaching stages. In comparison with chemically bleached pulp, biopulp with reduced alkali dose (88%) had higher breaking length (6.63%), double fold number (51.28%), tear index (2.83%), burst index (24.31%), along with increased viscosity (6.12%) and Gurley porosity (27.50%). These results clearly suggest that biopulping of wheat straw with xylano-pectinolytic enzymes can reduce chemical loading during soda-anthraquinone pulping and also improve the quality of paper. This is the first report demonstrating the biopulping of wheat straw using crude xylano-pectinolytic enzymes.

摘要

在这项研究中,探索了木聚糖-果胶酶在麦草制浆中的适用性。优化了合适的生物制浆条件,木聚糖酶用量为 400IU/g 麦草,果胶酶用量为 120IU/g 麦草,料液比为 1:10(g/ml),温度为 55°C,处理时间为 3h,添加 0.75%吐温 80 和 pH8.5。与化学浆相比,酶预处理可有效提高麦草的制浆性能,得到得率更高、卡伯值(15.67%)和筛渣率(59.65%)更低的纸浆。用酶预处理的麦草浆的白度比未经酶处理的麦草浆高 16.04%。生物制浆与 100%化学处理浆相比,可减少 12%的制浆化学品用量,同时保持更多的残碱含量,以达到相似的光学和化学性能。酶预处理还可改善纸浆的物理性能,提高耐破指数(26.50%)、撕裂指数(18.22%)和裂断长(5.56%)。酶加化学(88%制浆化学品)处理的纸浆在所有漂白阶段的白度和亮度均有所提高,同时黄度降低。与化学漂白浆相比,碱用量减少(88%)的生物浆具有更高的裂断长(6.63%)、耐折度(51.28%)、撕裂指数(2.83%)、耐破指数(24.31%),同时具有更高的粘度(6.12%)和葛尔莱透气度(27.50%)。这些结果清楚地表明,用木聚糖-果胶酶对麦草进行生物制浆可以减少苏打-蒽醌制浆过程中的化学品用量,同时提高纸张质量。这是首次报道用粗木聚糖-果胶酶对麦草进行生物制浆。

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引用本文的文献

[1]
Development of Raw Materials and Technology for Pulping-A Brief Review.

Polymers (Basel). 2023-11-20

[2]
Valorisation of wheat straw into paper with improved quality characteristics using ultrafiltered xylano-pectinolytic pulping approach.

3 Biotech. 2023-3

[3]
Production of eco-friendly and better-quality sugarcane bagasse paper using crude xylanase and pectinase biopulping strategy.

3 Biotech. 2023-2

[4]
Influence of mechanical operation on the biodelignification of by xylanase treatment.

3 Biotech. 2022-1

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