葡萄糖在超/亚临界醇-水二元混合溶剂中的稳定性研究  

The Stabilities of Glucose in Super/Sub-critical Alcohol-water System

作　　者：李雁博[1] 王存文[1] 王为国[1] 周诚[1] 陈文[1] 

机构地区：[1]武汉工程大学绿色化工过程省部共建教育部重点实验室,湖北武汉430073

出　　处：《生物质化学工程》2010年第1期14-18,共5页Biomass Chemical Engineering

基　　金：国家自然科学基金资助项目(20976140);湖北省自然科学基金项目(2008CDA024)

摘　　要：以降低对反应条件的要求、减少可发酵糖的降解为出发点,在压力10 MPa,温度165～315℃范围内,研究了葡萄糖在水及在物质的量分数为0.6的甲醇-水、乙醇-水、异丙醇-水二元混合溶剂中的稳定性。结果表明:相同反应条件下,葡萄糖在乙醇-水二元混合溶剂中的稳定性高于在水及甲醇-水二元混合溶剂中的稳定性,而与在异丙醇-水二元混合溶剂中的稳定性相差不大。且在本研究涉及的混合溶剂中,反应温度越高,葡萄糖的稳定性越差。鉴于葡萄糖在乙醇-水二元混合溶剂中有较好的的稳定性,在乙醇物质的量分数0～0.85,温度165～315℃,压力8～16 MPa,停留时间0.57～2.1 min范围内,对乙醇-水二元混合溶剂中葡萄糖的稳定性做了进一步研究。结果表明:葡萄糖的稳定性随乙醇物质的量分数的增加而增加;压力对葡萄糖的稳定性影响不大;停留时间越短,葡萄糖的稳定性越好,本研究条件范围内,乙醇的物质的量分数0.85,停留时间0.57 min,温度低于250℃葡萄糖稳定性相对较好。In order to lower the requirements of reaction conditions and reduce the degradation of fermentable sugars, the stabilities of glucose in alcohol-water system were studied at the condition of molar fraction 0. 6, pressure 10 MPa and temperature range 165-315 ℃. The experimental resuhs indicated that the stability of glucose is low in the condition of high temperature and higher in ethanol -water system than in methanol-water system and water, nearly the same as in isopropanol-water system. So the effects of pressure （ 8-16 MPa） , molar fraction （ 0-0.85 ） , temperature （ 165-315 ℃） and residence time （0.57-2.1 min ） on the stabilities of glucose in ethanol-water system were further studied. The experimental results indicated that the stabilities of glucose increase by the increment of molar fraction of ethanol. The effect of pressure is little. Long residence time is not good for the stabilities of glucose. The stablities of gluseose were better at the conditions of 0.85 molar fraction of ethanol, 0.57 min of residence time, and below 250 ℃ of temperature.

关 键 词：纤维素水解 葡萄糖 醇-水二元混合溶剂 稳定性 

分 类 号：TQ028[化学工程]