生物柴油抗氧化剂没食子酸异戊酯制备及其抗氧化性能研究

发布时间：2018-12-10 15:22

【摘要】：首先以吗啡啉和溴代正丁烷作为反应物,制成正丁基吗啡啉硫酸氢盐离子液体。采用离子液体作为催化剂催化没食子酸与异戊醇酯化合成没食子酸异戊酯。通过单因素试验和正交试验对合成没食子酸异戊酯的反应条件进行优化。结果表明:影响酯化产率的因素主次顺序为反应温度反应时间醇酸摩尔比催化剂用量;最佳反应条件为反应温度80℃,醇酸摩尔比30∶1,反应时间50 min,催化剂用量6%;最佳条件下酯化产率为97.45%。在此基础上进行酯化反应动力学分析,得出反应活化能为4.91 k J/mol,动力学模型为-dC_A/dt=5.22e-~(4.91/RT)C_A~(0.843)。分析了没食子酸异戊酯对8种生物柴油的抗氧化效果,其抗氧化性能极佳,在添加量为600 mg/kg时能使小桐子油生物柴油氧化稳定性能达到国家标准要求。
[Abstract]:Firstly, morpholine and bromo-n-butane were used as reactants to prepare normal Ding Ji morphine sulfate ionic liquid. Isoamyl gallate was synthesized by esterification of Gallic acid with isoamyl alcohol catalyzed by ionic liquid. The reaction conditions for synthesis of isoamyl gallate were optimized by single factor test and orthogonal test. The results showed that the main and secondary factors affecting esterification yield were reaction temperature, reaction time, molar ratio of alcohol to acid, reaction temperature 80 鈩，

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