杨木硝酸法制浆性能研究

Research on Nitric Acid Pulping of Populus X

以硝酸水溶液为蒸煮药剂,在常压下对小黑杨进行制浆性能的研究;探讨了最高蒸煮温度、硝酸浓度、蒸煮时间和液比对纸浆性能的影响,并对纸浆进行了可漂性研究。结果显示,在最高蒸煮温度为85℃、硝酸浓度为10%、液比为1∶10的条件下蒸煮268 min后,纸浆的得率可达58. 6%,高锰酸钾值为4～8;分别采用Na ClO和H2O2进行单段漂的漂后浆白度均低于Na OH联合漂剂漂白的漂后浆,在Na ClO漂白3 h时,Na OH-NaClO漂白浆白度可达84. 6%,漂白效果最佳。

The pulping property of hardwood poplar(Populus X)using nitric acid aqueous solution as a cooking agent under atmospheric pressure was studied.Effects of the cooking temperature,nitric acid concentration,the cooking time and wood solid to liquid ratio on the pulp property were discussed,and the bleachability of the pulp was studied.The results showed that the pulp yield reached 58.6%after cooking for 268 min with a maximum cooking temperature of 85℃,a nitric acid concentration of 10%,and a liquid ratio of 1∶10.The potassium permanganate value of the pulp was in the range of 4~8.The brightness of single-stage bleaching with NaClO or H 2O 2 was lower than that of bleaching combined using NaOH,the brightness of NaOH-NaClO bleached pulp was 84.6%when NaClO bleaching for 3 h,and the bleaching effect was the best.