乙二醇葡糖苷的合成及其动力学研究
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摘要
以新型、绿色强酸性阳离子交换树脂CT169为催化剂,葡萄糖和乙二醇为原料合成乙二醇葡糖苷。考察了催化剂用量、醇糖摩尔比和反应温度对葡萄糖转化率的影响,探讨了该反应的反应机理,并建立了反应的动力学模型,求取了模型的相关参数。结果表明,较佳反应条件为:n(乙二醇)∶n(葡萄糖)=7∶1,强酸性阳离子交换树脂CT169用量为葡萄糖物质的量的35%,反应温度为100℃,反应时间为5 h,在此条件下葡萄糖转化率达99.33%。催化剂重复使用7次,葡萄糖转化率基本不变,具有较好的重复使用性能。该过程为拟一级可逆反应,表观活化能Ea+=41.572 k J/mol,指前因子k0=7.716×103min-1。
Synthesis of glycol polyglucoside from glucose and glycol with a kind of new green strong-acid cation exchange resin as catalyst was studied. Factors affecting the reaction such as catalyst dosage,mole ratio of glycol to glucose and reaction temperature were investigated. Based on experimental data,the reaction mechanism of preparation process was proposed. The reaction kinetics model was established,and parameters of the kinetics equation were decided. The optimum reaction conditions were obtained as: n( glycol) ∶ n( glucose) =7 ∶ 1; dosage of the strong-acid cation exchange resin catalyst,35% of the mole of glucose; reaction temperature,100 ℃ for 5 h. Under such conditions,conversion of glucose can reach 99. 33%. When the catalyst was reused for seven times,conversion of glucose is basically unchanged,indicating a rather good reusing performance. The experiment results showed that the reaction can be considered as a quasi first order reversible reaction. The apparent activation energy is 41. 572 k J / mol,and the pre-exponential factor is7. 716 × 103min-1.
Synthesis of glycol polyglucoside from glucose and glycol with a kind of new green strong-acid cation exchange resin as catalyst was studied. Factors affecting the reaction such as catalyst dosage,mole ratio of glycol to glucose and reaction temperature were investigated. Based on experimental data,the reaction mechanism of preparation process was proposed. The reaction kinetics model was established,and parameters of the kinetics equation were decided. The optimum reaction conditions were obtained as: n( glycol) ∶ n( glucose) =7 ∶ 1; dosage of the strong-acid cation exchange resin catalyst,35% of the mole of glucose; reaction temperature,100 ℃ for 5 h. Under such conditions,conversion of glucose can reach 99. 33%. When the catalyst was reused for seven times,conversion of glucose is basically unchanged,indicating a rather good reusing performance. The experiment results showed that the reaction can be considered as a quasi first order reversible reaction. The apparent activation energy is 41. 572 k J / mol,and the pre-exponential factor is7. 716 × 103min-1.
引文
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[7]耿来红,王青宁,李澜,等.淀粉糖苷表面活性剂的吸湿保湿性能研究[J].化学通报,2012,75(9):820-826.
[8]吕树祥,李庆霞,陈创新.合成乙二醇葡萄糖苷的工艺条件对其保湿性能的影响[J].日用化学工业,2003,33(6):372-374.
[9]张婉萍,刘艳,郑芸芸,等.保湿剂与油脂对保湿性能影响研究[J].香料香精化妆品,2011(6):25-28.
[10]蓝仁华,樊芷芸,欧阳新平,等.对影响烷基多苷组成因素的探讨[J].精细化工,2000,17(9):501-502.
[11]马新涛,宋春玲.转糖苷化法合成烷基糖苷的研究[J].应用化工,2007,36(2):207-209.
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[15]尚会建,杨立彦,王亮,等.丁基多苷合成的影响因素探讨及其合成动力学研究[J].安徽农业科学,2011,39(7):3790-3792.
[16]章亚东,蒋登高,刘志伟,等.正十二烷基葡萄糖苷合成反应机理及动力学[J].日用化学工业,2002,32(1):5-7.
[17]王正烈,周亚平,李松林,等.物理化学:下册[M].4版.北京:高等教育出版社,2001:204-206.