螺杆挤压连续汽爆玉米秸秆的稀酸水解效果  

Hydrolysis effect of dilute acid on corn stalks by continuous screw extrusion steam explosion

作　　者：黄秋婷[1] 张鹏[1] 张淑荣[1] 李果[1] 

机构地区：[1]北京化工大学生命科学与技术学院,北京100029

出　　处：《农业工程学报》2009年第7期190-194,共5页Transactions of the Chinese Society of Agricultural Engineering

摘　　要：对采用螺杆挤压连续汽爆方法处理的玉米秸秆进行酸水解,探讨稀硫酸和稀盐酸在酸浓度、反应时间、反应温度及固液比等因素对经过处理的玉米秸秆水解效果的影响。结果表明:在硫酸水解正交试验中,影响水解过程的因素由主到次分别为:原料类型、固液比、水解温度、酸浓度和水解时间。其优化条件为:硫酸浓度3%,水解温度110℃,水解时间60min,固液比1︰15,此时120℃下汽爆10min的原料的水解效果最好,还原糖得率可达39.7%。在盐酸水解的正交试验中,影响水解过程的因素由主到次分别为:水解温度、原料类型、水解时间、酸浓度和固液比。在最优条件下,即采用120℃下汽爆6min的原料,在盐酸浓度为3%,水解温度110℃,水解时间60min,固液比1︰20的条件下进行水解,还原糖得率为42.0%。结果表明,螺杆挤压连续汽爆方法能有效提高玉米秸秆在稀酸条件下的水解能力。The corn stalks were pretreated by continuous screw extrusion steam explosion.The effects of the concentration of acid,reaction time,reaction temperature and the ratio of feedstuff to dilute acid on the conversion of the pretreated corn stalks to reducing sugars were investigated.In the orthogonal experiment of sulfuric acid hydrolysis,the effect order of five factors arranged from large to small was the type of raw materials,the ratio of feedstuff to dilute acid,hydrolysis temperature,concentration of H2SO4,and reaction time.The materials exploded at 120℃ for10 min had the highest reducing sugar yield at the optimal conditions of 3%sulfuric acid concentration,hydrolysis temperature 110℃,hydrolysis time 60 min,and ratio of feedstuff to dilute acid of 1：20,and the yield of reducing sugars was 39.7%.In the orthogonal experiment of hydrochloric acid hydrolysis,the effect order of five factors was hydrolysis temperature,the type of raw materials,hydrolysis time,concentration of acid and the ratio of feedstuff to dilute acid.The optimal conditions were 3%HCl,hydrolysis temperature 110℃,hydrolysis time 60 min,ratio of feedstuff to dilute acid of 1：20 and the material explosion at 120℃ forsix minutes,and the yield of reducing sugars was 42.0%.

关 键 词：螺杆挤压连续汽爆 玉米秸秆 糖化 水解 稀酸 

分 类 号：TK6[动力工程及工程热物理—生物能]