摘要
氧脱木素被认为是除了硫酸盐蒸煮脱木素外,成本最低且最简单的脱木素方法,所以氧漂可以把制浆与漂白结合起来。且氧脱木素技术具有环境污染小、漂后纸浆质量高等优点,现已成为ECF和TCF漂白的主体工艺。氧脱木素是以分子氧为漂白剂,酚型木质素与O2反应从而消除侧链,打开苯环,脱甲基化而被氧化降解。该过程受到用碱量、反应温度、时间、氧压、浆浓等许多工艺参数的影响。为改善氧脱木素效果,研究者提出了多种方法,如两段氧脱木素、助剂强化氧脱木素及氧脱木素前预处理等。氧脱木素在我国的应用前景是很广阔的,而且环境保护法规的日益严格对实施氧脱木素技术也十分有利,因此对于氧脱木素的研究还需继续。
Oxygen delignification is considered to be the most simple and lowest cost method of delignification besides kraft pulping. It can put pulping and bleaching together. Because of less environment pollution, higher yield, better quality and cost-effective, oxygen delignification has become a main process of elemental chlorine free （ECF） bleaching and totally chlorine free （TCF） now. Molecular oxygen, as the main bleacher, oxidizes and degrades phenol lignin by eliminating side chain, opening benzene ring and demethylation of lignin. These reactions can be influenced by many process parameters including alkali charge, reaction temperature, reaction time, oxygen pressure, concentration and so on. In order to improve the oxygen delignification efficiency, researchers have proposed various ways, such as two-stage oxygen delignification, reinforcement by additives, pretreatment and so on. Oxygen delignification is a promising bleaching method in China, and it compliance with the increasingly strict environmental protection law, so the research on the oxygen delignification need to continue.
出处
《纤维素科学与技术》
CAS
CSCD
2012年第4期53-64,共12页
Journal of Cellulose Science and Technology
基金
江苏省研究生培养创新工程项目(CXLX11-0529)
江苏高校优势学科建设工程资助项目
关键词
氧脱木素
TCF漂白
强化
预处理
oxygen delignification
totally chlorine free （TCF） bleaching
reinforcement
pretreatment
