针叶木化学浆高温液态水处理制浆粕工艺研究

以针叶木化学浆为原料,采用高温液态水工艺进行降解、次氯酸钠氧化调整聚合度和碱精制,制备化纤用浆粕,并研究主要影响因素,如有效氯用量、温度、时间及浆浓等对浆料甲纤含量及聚合度的影响。结果表明:在浆浓9%、温度180℃、时间40min的条件下对针叶木浆进行高温液态水处理,纸浆甲纤含量为88.47%,聚合度降低到768;在有效氯用量2.0%、温度50℃、时间1h的条件下对高温液态水预处理后的纸浆进行次氯酸钠氧化,纸浆甲纤含量达到91.54%,聚合度降低到528;在用碱量13%、20℃的条件下精制纸浆1h,浆粕的甲纤含量达到95.85%,聚合度达到536,浆粕的总得率为73.46%,甲纤含量和聚合度均可以满足黏胶纤维用浆粕的要求。

Preparation of cellulosic pulp with softwood pulp treated by liquid hot water

Softwood pulp was used to prepare cellulosic pulp by three procedures （liquid hot water, sodium hypochlorite oxidation and alkali extraction）. The impacts of main factors, such as temperature, reaction time, concentration and chlorine dosage on the methylcellulose content and the polymerization degree were investigated. Firstly, the pulp was pretreated by liquid hot water tinder the optimized conditions of concentration 9.0%, temperature 180℃ and treating time 40min, the methylcellulose content and the polymerization degree of pulp were 88.47% and 768 respectively. Secondly, the treated pulp was oxidized by sodium hypochlorite. Under the optimized conditions of chlorine dosage 2.0%, treating temperature 50℃, treating time lh, the methylcellulose content and the polymerization degree were 91.54% and 528 respectively. Finally, the oxidized pulp was treated by sodium hydroxide （alkali charge 13%） under 20℃ for lb. After treatment, the methylcellulose content and polymerization degree were 95.85% and 536 respectively, with the quality of cellulosic fiber meeting with the requirement ofviscosecellulose fiber.