在正交实验的基础上,结合抄纸实验,运用坐标综合评定法确定了相思木硫酸盐法制浆的最佳蒸煮条件。实验结果表明,在用碱量15%(以Na2O计)、硫化度30%、液比1∶4、蒸煮最高温度165℃、升温时间60 min、保温时间120 min的条件下进行硫酸盐...在正交实验的基础上,结合抄纸实验,运用坐标综合评定法确定了相思木硫酸盐法制浆的最佳蒸煮条件。实验结果表明,在用碱量15%(以Na2O计)、硫化度30%、液比1∶4、蒸煮最高温度165℃、升温时间60 min、保温时间120 min的条件下进行硫酸盐法蒸煮,所得纸浆得率52.25%,卡伯值17.9,黏度987.3 m L/g,裂断长9.32 km,抗张指数93.6 N·m/g,撕裂指数10.0 m N·m2/g,耐破指数5.34 k Pa·m2/g。展开更多
Isolation and utilization of hemicellulose are important processes in the pulp mill-based biorefinery. Considering the potential end use of the hemicellulose,this study investigated the concentration of monomeric and ...Isolation and utilization of hemicellulose are important processes in the pulp mill-based biorefinery. Considering the potential end use of the hemicellulose,this study investigated the concentration of monomeric and oligomeric sugars in the hydrolysate derived from autohydrolysis of acacia wood and the obtainment of these sugars via ethanol precipitation. The rate of generation of monomers and oligomers increased dramatically with an increase of the temperature from 160℃ to 180℃. The maximum content of oligomers and total sugars was achieved under conditions of 180℃ and 10 min,170℃ and 85 min,respectively. Interestingly,the maximum yield of hemicellulose via ethanol precipitation was achieved in a much shorter time,compared with the maximum yield of oligomer from the hydrolysate by autohydrolysis. A 6. 66 g / L quantity of hemicellulose was obtained by intensifying the conditions of ethanol precipitation. The hemicellulose characteristics were analyzed by Fourier transform infrared,nuclear magnetic resonance,and ultraviolet spectroscopy,and the molecular weight was determined by gel permeation chromatography and thermal analysis.展开更多
文摘在正交实验的基础上,结合抄纸实验,运用坐标综合评定法确定了相思木硫酸盐法制浆的最佳蒸煮条件。实验结果表明,在用碱量15%(以Na2O计)、硫化度30%、液比1∶4、蒸煮最高温度165℃、升温时间60 min、保温时间120 min的条件下进行硫酸盐法蒸煮,所得纸浆得率52.25%,卡伯值17.9,黏度987.3 m L/g,裂断长9.32 km,抗张指数93.6 N·m/g,撕裂指数10.0 m N·m2/g,耐破指数5.34 k Pa·m2/g。
基金supported by the National Natural Science Foundation of China(31470603)the Natural Science Foundation of Liaoning Province(2015020592)+1 种基金the Liaoning BaiQ ian Wan Talents Program(20149210-64)the Open Fund of State Key Lab of Pulp and Paper Engineering of China(201449)
文摘Isolation and utilization of hemicellulose are important processes in the pulp mill-based biorefinery. Considering the potential end use of the hemicellulose,this study investigated the concentration of monomeric and oligomeric sugars in the hydrolysate derived from autohydrolysis of acacia wood and the obtainment of these sugars via ethanol precipitation. The rate of generation of monomers and oligomers increased dramatically with an increase of the temperature from 160℃ to 180℃. The maximum content of oligomers and total sugars was achieved under conditions of 180℃ and 10 min,170℃ and 85 min,respectively. Interestingly,the maximum yield of hemicellulose via ethanol precipitation was achieved in a much shorter time,compared with the maximum yield of oligomer from the hydrolysate by autohydrolysis. A 6. 66 g / L quantity of hemicellulose was obtained by intensifying the conditions of ethanol precipitation. The hemicellulose characteristics were analyzed by Fourier transform infrared,nuclear magnetic resonance,and ultraviolet spectroscopy,and the molecular weight was determined by gel permeation chromatography and thermal analysis.
