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油酸甲酯氧化衰变特性及氧化反应表观活化能研究
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国家自然科学基金项目(51375491);后勤工程学院创新基金项目(YZ13-43703).


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    摘要:

    为了考察油酸甲酯的氧化衰变特性,采用自制氧化模拟装置将样品加速氧化,定时取样检测样品过氧化值、酸值和运动黏度(40 ℃),考察不同温度和氧气流量对氧化速率的影响;利用傅立叶红外光谱定性表征油酸甲酯氧化前后的结构变化;通过Rancimat法加速氧化试验,测定油酸甲酯的氧化诱导期,同时从氧化反应活化能角度进一步研究油酸甲酯的氧化反应机制。结果表明,氧气流量对油酸甲酯热氧化稳定性影响较小,但随着反应温度的升高,氧化诱导期缩短,氧化安定性显著下降;傅立叶红外光谱定性表征结果表明,油酸甲酯在氧化过程中可能发生不饱和双键的异构化;通过计算得到油酸甲酯的氧化反应表观活化能为34.058 kJ/mol。

    Abstract:

    The accelerated oxidation reaction was carried out on an oxidation simulator to study the oxidative stability of methyl oleate.The properties of the oxidative oils were analyzed such as peroxide value,acid value and kinematic viscosity(40 ℃),and the oxidation rates were explored under the condition of different temperature and oxygen flow rate.The oxidation process of methyl oleate was further characterized through Fourier transform infrared spectroscopy,and the induction period of methyl oleate was determined by the Rancimat method.The oxidation mechanism of oil sample was further studied through determining the reaction activation energy.The results show that the oxygen flow rate has less influence on the oxidation stability of oil sample,but the induction period is decreased and the oxidation stability of oil sample is obviously decreased with the increase of temperature.The double-bond isomerization transformation might be occurred in methyl oleate molecule during the oxidation of test sample according the test result of FTIR.The activation energy of oleic acid methyl ester obtained from Arrhenius equation is 34.058 kJ/mol.

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王学春,方建华,陈波水,王 九,吴 江,李 亮.油酸甲酯氧化衰变特性及氧化反应表观活化能研究[J].润滑与密封,2015,40(2):51-55.
.[J]. Lubrication Engineering,2015,40(2):51-55.

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  • 在线发布日期: 2015-04-27
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