玉米芯发酵乙醇残余物中木素酸化分离过程的研究

摘要

To improve the economic viability of the cellulosic ethanol production,it isof great importance to add value to residues of bioethanol production.In this research,lignin was separated from the fermentation residues of the corncob etha-nol production with a solid-liquid extraction method using alkali solution and then precipitated by sulfuric acid.The yields of lignin and zeta potential change through the acidification process were reported,and the morphology and size distribution of lignin aggregates were investigated.While taking the lignin yield and practicability into consideration,pH about 3.0 and temperature 65,℃ are the most suitable acidification conditions for lignin separation.%为了提高纤维素乙醇生产的经济效益，最大限度地利用发酵残余物，木素的分离利用是十分重要的。以玉米芯发酵乙醇残余物为原料，采用碱溶–酸沉淀的方法分离木素，讨论酸沉淀过程 pH、温度对木素得率的影响，并且对木素酸化过程中 Zeta 电位、粒径大小及分布、聚集体形态进行分析。从木素得率和分离操作性综合考虑，pH 为3左右，酸化温度65,℃时，从玉米芯发酵乙醇残余物中分离木素将会取得较好的效果。