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对商品氧脱木素硫酸盐蓝桉浆进行了(X)-CCE-A-Z-P-EG处理(X、CCE、A、Z、P、EG分别表示聚木糖酶处理、冷碱抽提、酸处理、臭氧漂白、过氧化氢漂白、单组分内切葡聚糖酶处理),研究了X-预处理对CCE脱除聚木糖效果、经CCE处理后浆料纤维素及溶解的聚木糖分子质量分布、浆料的漂白性能和最终质量以及用于制备黏胶纤维的浆料的反应性能的影响,详细分析了EG用量对纤维素分子链断裂的影响。结果表明,通过X-预处理和EG-后处理控制终漂浆黏度可减少碱处理和臭氧漂白时的化学品消耗量,提高浆料的反应性能。X-预处理结合低碱度(NaOH质量浓度70g/L)的CCE可以有效脱除浆料中的半纤维素,并能通过脱除大量的己烯糖醛酸侧链来提高浆料白度。X-预处理浆的磺化反应性能好,制得的黏胶纤维纺丝液质量较佳(颗粒含量较低)。不同处理条件(有/无X-预处理)的浆料纤维素具有很窄的分子质量分布,制得的黏胶纤维的质量与用商品溶解浆生产的黏胶纤维的质量相当。
The commercial oxygen delignification sulfate blue eucalyptus pulp was subjected to (X) -CCE-AZP-EG treatment (X, CCE, A, Z, P and EG represent xylanase treatment, cold alkali extraction and acid treatment , Ozone bleaching, hydrogen peroxide bleaching, single-component endoglucanase treatment), X-pretreatment on the CCE removal of xylo-oligosaccharides, CCE-treated pulp cellulose and dissolved xylose Molecular weight distribution, pulp bleaching performance and final quality, as well as the reactivity of the slurry used to prepare viscose fiber, the effects of EG dosage on the molecular chain breakage of cellulose were analyzed in detail. The results show that the control of the final melt viscosity by X-pretreatment and EG-post-treatment can reduce the consumption of chemicals during alkali treatment and ozone bleaching and improve the reactivity of the slurry. X-pretreatment combined with CCE with low alkalinity (NaOH concentration 70g / L) can effectively remove the hemicellulose in the slurry and increase the whiteness of the slurry by removing a large amount of hexenuronic acid side chains . X-pretreatment of the pulp sulfonation reaction performance, viscose fiber spinning solution obtained better quality (lower particle content). Slurry cellulose with different processing conditions (with and without X-pretreatment) has a very narrow molecular mass distribution and the quality of the viscose fibers produced is comparable to that of viscose fibers produced with commercial dissolving pulp.