常压温和条件下丙酸预处理小麦秸秆的工艺优化

Technology optimization of wheat straw pretreatment bypropionic acid under mildness condition

为了提高小麦秸秆木质纤维素的能源化利用效率,该文研究了常压温和条件下丙酸预处理小麦秸秆的工艺优化。该方法的最佳工艺条件为:料液比1:16、粒度40目、丙酸质量浓度900g/L、催化剂质量浓度3g/L、温度70℃,处理时间150min。在此条件下,小麦秸秆的纤维素保留率为92.6%,半纤维素和木质素的脱除率分别为98.3%和70.5%。丙酸预处理后小麦秸秆的酶解得率90.3%。研究表明,在常压温和条件下,丙酸法预处理小麦秸秆,可有效地将其分离为纤维素、半纤维素、木质素3大组分。

In order to increase the wheat straw lignocellulose energy-oriented use efficiency,the technology optimization of pretreatment of wheat straw by propionic acid under mildness condition was studied.The experimental results showed that the optimum working conditions were as follows：materials to liquid ratio 1：16,particle size 40 mesh,propionic acid concentration 900 g/L,catalyst concentration 3 g/L,temperature 70℃,pretreatment time 150 min.The remaining rate of cellulose of wheat straw was 92.6% under the optical conditions,and the elimination rates of hemi-cellulose and lignin of wheat straw after propionic acid treat ment were 98.3% and 70.5% respectively.The enzymatic hydrolysis yield of wheat straw pretreated by propionic acid was 90.3%.Under mildness condition,wheat straws pretreated by propionic acid were degraded into the three parts,cellulose,hemi-cellulose and lignin.