【摘要】 实验采用Discover微波精确有机合成系统,采用单模聚焦微波辐射技术及电脑微控和空压气体同步冷却技术,以玉米淀粉为原料,并且以丙烯氰为醚化剂,研究了单模聚焦微波辐射对玉米淀粉羧乙基化的影响。通过正交实验确定最佳工艺条件:淀粉4.0g,丙烯腈2.7g,氢氧化钠3.0g,乙醇溶液体积为35mL,微波辐射功率95W,辐射时间4min,最高温度50℃。在此条件下可以快速有效获得较高取代度的羧乙基玉米淀粉。产品经红外光谱仪表征,证实与目标产物完全一致。更多还原

【Abstract】 The carboxyethyl corn starch(CES) has been synthesized by alcohol medium method,using the corn starch as material and the acrylonitrile as etherification agent,by the discover line of focused synthesis instrumentation.In the power-time control type of the discover system,with the corn starch 4.0g,the factors influencing on the degree of substitution of CES are investigated by an orthogonal experiment.The optimal conditions for CES are as follows: the amount of the acrylonitrile is 2.7g,the sodium hydroxide is 3.0g,the volume of alcohol solution is 35mL,irradiation time is 4min,irradiation power is 95W and the maximum temperature is 50℃.The product was characterized by the infrared spectrometer,and showed that it was identical will the aimed one.更多还原