Abstract

Utilization of low-cost paper grade pulp is not feasible in Lyocell process due to presence of metallic and hemicellulose impurities that degrade cellulose and N-methyl-morpholine-N-oxide and lower the onset temperature of dope to initiate runway reaction. Conventional Lyocell process is restricted to use good quality dissolving grade pulp for safety reasons. To overcome this limitation, modified Lyocell process is demonstrated by pretreating pulps to remove metallic and hemicellulose impurities. Effectiveness of modified Lyocell process for faster dissolution and impurities removal for pulps/pulp blends is studied. Pretreatment of pulp blends significantly reduce impurities by 14–32% and improve swelling of pulp results in faster dissolution and safer process. Biopolymer prepared from modified process reduces undissolved particles by 50% and impurities by 30% thus improving overall quality and spinnability. This concept provides practical solution for using paper grade/impure pulps and making it more economical, faster dissolution and safe as compared to conventional process.

Graphical abstract

中文翻译：

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改进的莱赛尔（Lyocell）工艺可改善纤维素纸浆和纸浆混合物在NMMO溶剂中的溶解度

摘要

由于存在金属和半纤维素杂质，会降解纤维素和N-甲基-吗啉-N，因此在Lyocell工艺中使用低成本纸级纸浆是不可行的-氧化并降低浓液的起始温度以引发跑道反应。出于安全原因，常规的莱赛尔（Lyocell）工艺仅限于使用优质的溶解级纸浆。为了克服这一限制，改良的莱赛尔（Lyocell）工艺通过对纸浆进行预处理以去除金属和半纤维素杂质来证明。研究了改进的莱赛尔（Lyocell）工艺对于纸浆/纸浆混合物的快速溶解和杂质去除的有效性。纸浆混合物的预处理可将杂质显着减少14-32％，并改善纸浆的溶胀度，从而加快溶解速度并提高工艺安全性。通过改良工艺制备的生物聚合物可将未溶解的颗粒减少50％，将杂质减少30％，从而提高整体质量和可纺性。该概念为使用纸级/不纯纸浆提供了实用的解决方案，并使其更加经济，

图形概要