以5-甲基-2-巯基-1,3,4-噻二唑(MMTD)和水杨酸为主要原料,合成一种新的噻二唑衍生物——水杨酸硫代-(5-甲基-1,3,4-噻二唑)酯(TM).利用红外光谱、元素分析、液相色谱、质谱等分析手段对产物进行结构表征,采用热重分析评价产物的热稳定性,利用四球摩擦磨损试验机考察TM在菜籽油中的抗磨减摩性能.结果表明:合成产品TM的热分解温度为225.6℃,具有较好的热稳定性；合成产品TM具有良好的抗磨减摩性能,可作为油品的抗磨减摩添加剂,当添加量(ω)为0.6%时,其抗磨减摩效果最佳.
A thiadiazole derivative named 2-benzylmercapto-5-methyl-1,3,4-thiadiazole(TM),a novel additive for conventional lubricating oil,was synthesized from 2-mercapto-5-methyl-1,3,4-thiadiazole,and characterized by means of FTIR,elemental analysis,liquid chromatography and mass spectrometry.Thermal gravimetric analysis was carried out to evaluate its thermostability and the results showed that the thermal decomposition temperature of TM was at 232 ℃.Anti-corrosion and friction-reducing performances of TM in based stock were investigated by means of copper strip corrosion and four ball tester test.The results indicated that the wear diameter and frictional coefficients of the system could be lessened obviously with the addition of TM.In the range of load 100-500 N,the appropriate dosage of TM was 0.6%.
In this paper,with rapeseed oil as raw material,have the reaction with methanol under ultrasonic wave with the addition of KNO3/ Al2O3 as solid base catalyst,then the bio-diesel was obtained.The ultrasonic frequency,the molar ratio of methanol to rapeseed oil and the dosage of catalyst were investigated.We found out optimum reaction conditions as following: the ultrasonic frequency was 30 kHz,the molar ratio of methanol to rapeseed oil was 7∶1,the quality ratio of cata-lyst to rapeseed oil was 2.0%,in this case,the yield was up to 94%.Then the performance of the obtained bio-diesel was investigated,which reach the current bio-diesel standards in Germany.
以Ce(SO4)2-HCl体系为氧化体系, N , N-二甲基甲酰胺(DMF)为萃取剂,在石油醚中加入一定量的二苯并噻吩(DBT)构成柴油模拟体系,通过正交实验得出最佳脱硫条件:pH值为1,Ce(SO4)2加入量为0.008 g/mL(油)、温度为30℃、时间为50 min、V盐酸介质∶ V柴油=4∶ 5.通过模型参数估值和曲线拟合得出反应级数为1.3,探索出最优条件下反应动力学方程.Ce4+ 氧化媒质可用电化学方法再生循环利用,具有很好的经济效益,符合绿色化学发展的态势.
