蔗渣纤维素分离纯化预处理工艺条件优化

Pretreatment Conditions Optimization of Separation and Activation of Bagasse Cellulose

为获得较高蔗渣纤维素得率和增大预处理后纤维的比表面积,在常规碱处理基础上添加无水亚硫酸钠和增加稀硝酸处理工艺的方法,对蔗渣纤维素的纯化分离工艺条件进行优化;采用FTIR、SEM和BET测试对处理后样品表征分析。结果表明:硝酸质量浓度0.12 g/m L,Na OH质量分数2.5%,反应温度80℃,反应时间3 h,无水亚硫酸钠与蔗渣质量比1∶6,纤维素含量达91.49%;处理后纤维结构松散,表面粗糙,增加了纤维素的可及度和比表面,经过经典统计BET(Brunaller,Emmetl,Teller)测定其比表面积增大1.713倍。

In order to obtain higher bagasse cellulose concentration and increase the surface area of fiber after pretreatment,on the basis of conventional alkali pretreatment by adding anhydrous sodium sulfite and using dilute nitric acid pretreatment method,to improve the conditions of purification and separation technology of bagasse cellulose,bagasse cellulose samples was characterized using FTIR,SEM and BET nitrogen adsorption specific surface area instrument. Result showed that when the concentration of nitric acid was 0. 12 g / mL,the mass fraction of Na OH was 2. 5%,the reaction temperature in acid and alkali treatment process was 80 ℃ and reaction time was 3h,the mass ratio of anhydrous sodium sulfite and the bagasse was 1 ∶ 6,cellulose content in the sample after the treatment process was up to 91. 49%; after the treatment,bagasse samples,structure was loose and rough,significantly increase the accessibility and specific surface area of cellulose,after the determination of BET,the specific surface area was increased to 1. 713 times.