氧漂桉木氢氧化钠-蒽醌浆的臭氧漂白工艺研究

Study on Ozone Bleaching Process of Oxygen Bleached Eucalyptus Soda-AQ Pulp

中文关键词:  氢氧化钠-蒽醌法  桉木化学浆  臭氧  漂白

Key Words:soda-AQ  eucalyptus chemical pulp  ozone  bleaching

中文摘要:

      采用氢氧化钠-蒽醌法制备桉木化学浆，经氧脱木质素处理后，对其进行臭氧漂白工艺研究。探讨了臭氧漂白过程中，温度、臭氧浓度、保护剂类型及用量（相对于绝干浆质量）对纸浆漂白及成纸后纸张物理性能的影响，初步得到较优的漂白工艺参数。结果表明，当漂白温度10 ℃、臭氧浓度80 g/Nm³、草酸用量1.0%时，纸浆白度可达72.8%，黏度678 mL/g，Kappa值4.18，成纸后纸张抗张指数78.9 N·m/g，耐破指数4.99 kPa·m²/g，撕裂指数5.96 mN·m²/g，耐折度38次。

Abstract:

      In this study， ozone bleaching technology was introduced into bleaching process of soda-AQ pulp after oxygen delignification treatment. The effects of ozone concentration， temperature， type and dosage （relative to dry pulp weight） of protectant on the bleached pulp and physical properties of paper prepared were studied to preliminarily obtain the optimum bleaching parameters. The results showed that when 80 g/Nm³ of ozone was used in bleaching process with 1.0% of oxalic acid as protective agent at 10 ℃， the bleached pulp with 72.8% brightness was produced， the viscosity and Kappa number of it were 678 mL/g and 4.18， respectively. Besides， physical properties of paper prepared by bleached pulp were tested， the tensile index of paper was up to 78.9 N·m/g， and the burst index， tearing index and folding times were 4.99 kPa·m²/g， 5.96 mN·m²/g， 38 times， respectively.