摘要
目前,秸秆主要作为性质单一组分的纤维素原料而采用生物转化法或快速热解法加以利用。生物转化法主要利用纤维素,而利用木质素和半纤维素较困难;快速热解生物质又使部分组分低值利用,而且得到的生物油品质低。为解决单一的生物或热转化方式存在的问题,提出秸秆分层多级转化液体燃料的新构思,即以秸秆“组分分离、分级定向转化”为核心,将生物转化和热转化有机结合多级转化生产燃料酒精与生物油。研究结果表明,秸秆经过汽爆处理后,采用高浓度发酵 分离乙醇耦合系统,可降低纤维素酶用量,提高了纤维素酶解效率,而且简化操作过程,使蒸馏前乙醇浓度达到6 0 %以上。发酵乙醇剩余物再经热解后,不但热解温度较原秸秆明显降低,而且所得生物油品质有了明显改观。
Straw characterized as the raw material of simplex cellulase is used mainly by biological conversion or fast pyrolysis.However,the former focuses on the cellulose utilization,with low wtilization rate of lignin and hemicellulose.In addition,biological oils obtained from fast pyrolysis are of low quality.A new notion of bio-liquid fuels production was advanced in the present paper to solve above problems e.g the bioful yielded through directional multi-level conversion.For steam-exploded straw,through coupling system of high-density fermentation and ethanol extraction,the cellulase loading can be decreased to a certain extent and the ethanol concentration yielded reaches 60%.Moreover,biological oil obtained through pyrolysis of fermented residue is of better quality than that directly yielded form straw.
出处
《生物加工过程》
CAS
CSCD
2005年第1期9-13,共5页
Chinese Journal of Bioprocess Engineering
基金
国家重点基础研究发展规划 (973计划 )项目No 2 0 0 4CB71970 0
国家高技术研究发展计划 (863计划 )No 2 0 0 1AA5 14 0 2 3
中国科学院知识工程创新重要方向性项目No KJCXZ SW 2 0 62
关键词
秸秆
组分分离
分级转化
生物转化
快速热解
酒精
生物油
straw
multi-level conversion
biological conversion
fast pyrolysis
ethanol
bio-oil