超/亚临界水两步法水解玉米秸秆制备还原糖  

Production of Reduced Sugars from Corn Stalk Hydrolysis by Two-Step Method of Supercritical/Subcritical Water Process

作　　者：刘慧屏[1] 银建中[1] 徐刚[1] 

机构地区：[1]大连理工大学化工机械学院,辽宁大连116012

出　　处：《化学与生物工程》2010年第11期47-50,共4页Chemistry & Bioengineering

基　　金：国家自然科学基金资助项目(20976028)

摘　　要：以玉米秸秆为原料,采用两种间歇式反应器,对其在超/亚临界水条件下的水解行为进行研究,重点考察了反应温度、反应时间对还原糖产率和液化率的影响。设计了亚临界低温段水解+超临界高温段水解两步法水解生物质的工艺路线,并与超临界一步法水解工艺进行比较。结果表明,对玉米秸秆进行低温段水解,在固液比1∶100、190℃、40 min条件下获得最大还原糖产率为24%;将低温段水解残渣作为高温段水解的原料,在380℃、20 s条件下获得最大还原糖产率为34%。相同条件下,用超临界一步法直接对玉米秸秆进行水解,获得最大还原糖产率为41%。超/亚临界水两步法水解玉米秸秆工艺所获得的还原糖总产率为58%,比超临界一步法水解工艺的还原糖产率提高了17%。In this paper,the corn stalk hydrolysis was conducted by supercritical/subcritical water process using two kinds of batch reactors.The effects of reaction temperature and reaction time on the liquefaction rate of corn stalk and the yield of reduced sugar were studied.A two-step method（TSM） consisted by subcritical water and sequenced with supercritical water hydrolysis process was presented.After low-temperature hydrolysis process,the maximum yield of reduced sugars was about 24% under the optimum conditions of the ratio of solid to liquid 1∶100,190℃,40 min.The residues of the corn stalk from low-temperature hydrolysis process were hydrolyzed at 380℃ for 20 s,the maximum yield of reduced sugars was about 34%.Under the same conditions,the maximum yield of reduced sugars was about 41% by one-step method of supercritical water hydrolysis for original corn stalk.The total yield of two-step method was 58%,which increased 17% over the one-step method.

关 键 词：生物质 玉米秸秆 超/亚临界水 水解 还原糖 

分 类 号：TQ352.62[化学工程]