麦草秸秆微晶纤维素的制备工艺

研究以麦草秸秆为原料制取微晶纤维素的制备工艺。运用添加乙酸的乙醇法低污染制浆技术,溶出麦草秸秆中的木素、半纤维素等杂质,采用全无氯的臭氧及过氧化氢漂白工艺对粗纤维素进行漂白,然后通过盐酸水解和稀碱处理制备得到微晶纤维素。结果表明,试验制取的微晶纤维素符合合成革用微晶纤维素的标准。在提取粗纤维素过程中催化剂乙酸的最佳用量是2%。水解时间对微晶纤维素产品聚合度的影响较大。麦草秸秆制取微晶纤维素的最佳工艺条件为:液比1:15,水解温度70℃,水解时间90min。碱处理的工艺条件为:碱浓5%,温度80℃,处理时间30min。

Preparation of Microcrystalline Cellulose from Wheat Straw Stalks

The preparation process of microcrystalline cellulose using wheat straw stalks as raw material was studied. Acetic acid was added into low-polluted ethanol pulping under the high temperature to dissolve the lignin, hemicelluloses and other impurities. Hydrochloric acid and weak alkali were adopted to hydrolyzed and treated the coarse cellulose bleached by TCF technology of ozone and hydrogen peroxide bleaching processes. Results showed that the prepared microcrystalline cellulose met the synthetic leather s...