棉秆纤维素在离子液体中溶解及分离的工艺参数  

Technical parameters of dissolution and separation of cotton stalk cellulose in ionic liquid

作　　者：刘雁红[1,2] 邓宇[2,3] 

机构地区：[1]天津科技大学理学院,天津300457 [2]天津市制浆造纸重点实验室,天津300457 [3]天津科技大学材料科学与化学工程学院,天津300457

出　　处：《农业工程学报》2009年第9期259-263,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：天津市应用基础研究计划项目(07JCYBJC01900)

摘　　要：离子液体是纤维素的新型绿色溶剂,是可以进行纤维素均相反应的非衍生化溶剂。为解决纤维素生产加工过程复杂且污染严重问题,试验探讨了棉秆纤维素在离子液体溴代N-乙基吡啶中的溶解性能,采用红外光谱等手段对棉秆纤维素在离子液体中溶解和再生前后的结构变化进行了分析,并探讨了离子液体的回收。结果表明,未经活化的棉秆纤维素可直接溶解于离子液体而不发生其他衍生化反应。溶解的较优条件是:溶解温度为120℃,分离方式为冷至室温加冷水,溶解时间为30min,水液比为1:2;棉秆所得水洗不溶物质量均可稳定在0.41g左右,离子液体可以循环使用多次且活性没有明显降低。As a new green solvent,ionic liquid is a non-derivative solvent of cellulose which can be used to carry out homogeneous reaction.In order to solve the problems of complex cellulose production process and serious pollution,The paper investigated the solubility of cotton stalk cellulose in ionic liquid N-ethyl pyridinium bromide.The structural differences between cotton stalk cellulose and cellulose regenerated from the ionic liquid were investigated using infrared （IR） spectroscopy and chemical analysis. Recovery ratio of ionic liquids was also studied. The results show that cotton stalk cellulose can dissolve in the ionic liquid directly and does not cause derivative reaction of the solute. The optimal conditions of dissolution are that dissolution temperature is 120~C, the separation method is to add water after cooling to room temperature, dissolution time is 30 min and the ratio of material to ionic liquid is 1：2. Ionic liquid can be recycled many times, and activation is not reduced obviously.

关 键 词：纤维素 溶解 分离 棉秆 溴代N-乙基吡啶 

分 类 号：TQ341.9[化学工程—化纤工业]