【摘要】 氧脱木素是一个包含有多种活性氧参与的复杂的反应过程。O2在木素、碱液以及金属离子的共同作用下逐步被还原为O2-·、HO·、H2O2等活性氧。HO·与O2-·是氧脱木素过程中两种主要自由基,在脱木素过程中发挥协同作用使得木素大分子降解并溶出。氧脱木素选择性由碳水化合物的降解程度以及木素脱除率决定。HO.的强氧化性是造成碳水化合物降解的主要原因;联苯结构、对羟基苯结构等"惰性"木素单元不易降解溶出以及LCC连接、碳水化合物的结晶结构对O2及氧自由基的阻碍作用,是限制木素脱除的主要原因。更多还原

【Abstract】 Oxygen delignification is a complex process in which several active oxygen species take part in. O2 are gradually reduced to O-2·、HO·、H2O2 etc by the combining effect of lignin, alkaline solution and metal ions. HO· and O-2· are the main oxygen radicals in oxygen delignification. They have different reaction with lignin and their synergism makes lignin degrade and even dissolve.The selectivity of oxygen delignification is dependent on the degradation of carbohydrates and the ratio of lignin removal. HO· has strong oxidizability and causes carbohydrates degradation. 5-5′diphenyl and p-hydroxybenzene structure are inert and difficult to be removed; LCC compound and the crystal structure of carbohydrate are the main obstacles to lignin removal.更多还原