氧漂桉木硫酸盐浆臭氧漂白工艺研究

Study on Ozone Bleaching Process of Oxygen Bleached Eucalyptus Kraft Pulp

中文关键词:  桉木  硫酸盐浆  氧脱木质素  臭氧  漂白

Key Words:eucalyptus  kraft pulp  oxygen delignification  ozone  bleaching

中文摘要:

      采用硫酸盐法制备桉木硫酸盐浆，经氧脱木质素处理后，对其进行臭氧漂白工艺的研究。探究臭氧漂白过程中浆浓、漂白时间、pH值、臭氧用量等对纸浆漂白性能及成纸性能的影响，得到较优的漂白工艺条件。结果表明，当浆浓为35%、漂白时间3 min、臭氧用量0.9%和pH值为2.0时，所得纸浆白度为76.9% ISO、纸浆黏度为535 mL/g、纸浆Kappa值为2.71，成纸抗张指数、耐破指数、撕裂指数和耐折度分别为57.4 N·m/g、4.77 kPa·m²/g、7.95 mN·m²/g和89次。

Abstract:

      In this study， ozone bleaching technology was introduced into bleaching process of eucalyptus kraft pulp after oxygen delignification treatment. The effects of pulp concentration， bleaching time， pH value， and ozone dosage on the properties of bleached pulp and paper were studied； the optimum bleaching conditions were preliminarily obtained. The results show that when 35% concentration of pulp was used in bleaching process with 0.9% dosage of ozone at pH value of 2.0 for 3 min， bleached pulp with 76.9% ISO brightness was produced， the viscosity and Kappa number were 535 mL/g and 2.71， respectively. Moreover， the as-prepared paper has decent physical properties with tensile index， burst index， tear index， and folding strength of 57.4 N·m/g， 4.77 kPa·m²/g， 7.95 mN·m²/g， and 89 times， respectively.