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首页> 外文期刊>Journal of Wood Chemistry and Technology >SO2-Ethanol-Water (SEW) Pulping: II. Kinetics for Spruce, Beech, and Wheat Straw
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SO2-Ethanol-Water (SEW) Pulping: II. Kinetics for Spruce, Beech, and Wheat Straw

机译：SO2-乙醇-水（SEW）制浆：II。云杉，山毛榉和小麦秸秆的动力学

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摘要

SO_2-ethanol-water (SEW) delignification kinetics for spruce, beech, and wheat straw are presented. All these species produce pulps using SEW cooking liquor and follow first order delignification kinetics at similar bulk delignification rates. However, residual delignification is much slower for beech than for spruce. The hemicelluloses retention (135℃) and cellulose degradation kinetics are also characterized for beech SEW pulping. Xylan and glucomannan are removed from the pulp following first-order kinetics with a higher rate constant for xylan. Cellulose is retained in the fibers until kappa number 9, after which it starts to dissolve in the liquor. The yield also drops significantly in the region of kappa numbers 9-7. Cellulose degradation is followed by intrinsic viscosity measurements and is found to be zero order in cellulose. The rates are higher at 135 and 145℃ for beech SEW pulping than for spruce.
机译：介绍了云杉，山毛榉和小麦秸秆的SO_2-乙醇-水（SEW）脱木质素动力学。所有这些物种都使用SEW蒸煮液生产纸浆，并以相似的整体脱木质素率遵循一阶脱木质素动力学。但是，山毛榉的残留去木质素作用要比云杉慢得多。对于山毛榉SEW制浆，还具有半纤维素保留（135℃）和纤维素降解动力学的特征。按照一级动力学从木浆中除去木聚糖和葡甘露聚糖，木聚糖的速率常数较高。纤维素保留在纤维中，直到9号κ，此后它开始溶解在液体中。在κ数为9-7的区域中，产率也显着下降。纤维素降解后进行特性粘度测量，发现在纤维素中为零级。山毛榉SEW制浆在135和145℃的比率高于云杉。

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