陈霞 刘明友 乐飞 李劲松

摘要： 以臭氧（O₃）用量作为自变量，纸浆卡伯值（K）、黏度和白度为响应值，研究了臭氧用量对纸浆漂白性能的影响，结果表明，臭氧最佳用量为0.77%，此时漂白后纸浆卡伯值、黏度、白度分别为8.1、658.4 mL/g、41.9%。计算漂白过程中脱木素选择性、单位臭氧消耗内卡伯值的降低率和白度的增加率，通过线性回归建立合适的数学模型，求出各因素随臭氧用量（）或卡伯值的预估函数。研究表明，硫酸盐阔叶木浆低浓臭氧漂白时，臭氧用量对卡伯值的关系采用指数模型较为合适，其方程为。结合黏度、白度随卡伯值变化的方程，臭氧用量取0.77%、其他条件一定时，通过该模型预测得到纸浆卡伯值、黏度、白度分别为7.8、624.2 mL/g、42.9%，该经验模型可预测并优化低浓硫酸盐阔叶木浆的臭氧漂白反应。

关键词：阔叶木浆;臭氧漂白;低浓纸浆;臭氧用量;经验模型

中图分类号：TS745    文献标识码：A    DOI：10.11980/j.issn.0254-508X.2019.03.003

Abstract： The independent variable was ozone consumption， responses values were Kappa number， viscosity and brightness， the influence of ozone consumption on pulp properties was studied. A pulp with Kappa number of 8.1， viscosity of 658.4 mL/g and whiteness of 41.9% could be achieved under an optimal condition with ozone consumption was 0.77%. The bleaching selectivity， the efficiency expressed as brightness gain and lignin removal was calculated， the appropriate mathematical models were established by linear regression. The Kappa number estimation function of hardwood kraft pulp by the ozone consumption was： ， and  was 0.9987. Combined with the equations between viscosity， brightness and Kappa number， when the ozone dosage was 0.77% and other conditions were certain， the Kappa number， viscosity and whiteness of the pulp were predicted to be 7.8， 624.2 mL/g， and 42.9%， respectively. The model could be used to predicate and optimize the bleaching responses of ozone bleaching of low consistency hardwood kraft pulp as the ozone consumption changed.

Key words： hardwood pulp; ozone bleaching; low consistency pulp; ozone consumption; empirical model

纸浆清洁生产是造纸工业持续发展的保证，早在20世纪80年代，联合国环境规划署对造纸清洁技术进行了概括，欧美等发达国家和地区就已采用无元素氯（ECF）漂白工艺^[1-2]。在ECF基础上，人们进一步提出了更安全、环保的全无氯（TCF）漂白技术^[3]。臭氧（O₃）作为一种新型漂剂，在漂白过程中不仅能很好地脱除木素，减少环境污染，还可以赋予纸浆较好的性能，如在某些情况下臭氧处理机械浆可以增加纤维的柔软性，臭氧处理高硬度硫酸盐浆出现类似打浆作用，提高纸浆的抗张指数和耐破指數^[4-5]。由于中高浓纸浆臭氧漂白具有用水少、漂白效率高等优点，因此目前国内外对于臭氧漂白的研究多集中于高浓纸浆和中浓纸浆的漂白^[6-7]。……