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Pulp refining in improving degree of substitution of methylcellulose preparation from jute pulp
Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2020-05-08 , DOI: 10.1007/s13399-020-00741-x
Sumaiya Akhter Ria , Taslima Ferdous , Kazi M. Yasin Arafat , M. Sarwar Jahan

Jute is the most important crop in Bangladesh, and it plays a vital role in the country’s economy. Bangladesh is the second largest jute producer in the world. In this paper, methylcellulose was prepared from jute pulp in bleached, unbleached, and refined and unrefined state. The methoxyl content of the methylcellulose prepared from the unbleached pulps were only 13.2–14.3%, while the methoxyl content for bleached pulp reached to 16.5–18.8%. The methoxyl content of bleached pulp after 3000 revolution of refining reached to 24.63% in 4 h of reaction time, which further increased to 36.60% in 5 h reaction time. Further PFI revolution did not increase methoxyl content significantly. The water solubility of the prepared methylcellulose was directly related with degree of substitution (DS). The infrared spectra of methylcellulose at the regions of 3400 and 2900 cm−1 and its ratio showed a lower intensity than the pulp sample evidencing the methylation of the samples.



中文翻译:

纸浆精炼可提高黄麻纸浆中甲基纤维素制剂的取代度

黄麻是孟加拉国最重要的农作物,对国家的经济起着至关重要的作用。孟加拉国是世界第二大黄麻生产国。本文是从黄麻浆中经漂白,未漂白,精制和未精制制得甲基纤维素。由未漂白纸浆制备的甲基纤维素的甲氧基含量仅为13.2-14.3%,而漂白纸浆的甲氧基含量达到16.5-18.8%。漂白浆粕经3000转精制后的甲氧基含量在4小时的反应时间内达到24.63%,在5小时的反应时间内进一步增加到36.60%。进一步的PFI旋转并没有明显增加甲氧基含量。制备的甲基纤维素的水溶性与取代度(DS)直接相关。-1及其比率显示出比纸浆样品更低的强度,证明了样品的甲基化。

更新日期:2020-05-08
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