Waste cooking oil (WCO) or frying oil was used for synthesis of biolubricant via transesterification reaction. Biolubricant (dioleoyl ethylene glycol ester) was prepared from fatty acid methyl esters (FAMEs) of WCO with ethylene glycol (EG). The reaction was performed using calcium oxide (CaO) heterogeneous catalyst. Dioleoyl ethylene glycol ester is a potential biodegradable lubricant that could be used in industrial lubricant applications. The effect of changing operating conditions such as temperature, molar ratio of reactants, reaction time and catalyst loading was studied. The optimal conditions that achieved highest conversion were found to be 130 °C, 3.5: 1, 1.5 h and 1.2% (w/w) catalyst dosage. The produced biolubricant structure was tested using FTIR spectrum technique and its thermal stability was examined using TGA technique. The biolubricant properties were compared to two other biolubricants and also to specifications of four different ISO viscosity grade lubricants. It was found that produced biolubricant complies with ISO VG68 viscosity grade with better low temperature applicability. The process simulation was performed on Aspen HYSYS program version 9 using conversion reactor model and using Non-Random Two-Liquid (NRTL) activity coefficient model. Simulation results proved that the studied biolubricant production process is industrially applicable.

废食用油（WCO）或煎炸油用于通过酯交换反应合成生物润滑剂。由WCO与乙二醇（EG）的脂肪酸甲酯（FAMEs）制备生物润滑剂（二油酰基乙二醇酯）。使用氧化钙（CaO）非均相催化剂进行反应。二油酰基乙二醇酯是一种潜在的可生物降解的润滑剂，可用于工业润滑剂应用中。研究了改变操作条件如温度，反应物的摩尔比，反应时间和催化剂载量的影响。发现实现最高转化率的最佳条件是130℃，3.5：1、1.5h和1.2％（w / w）的催化剂用量。使用FTIR光谱技术测试产生的生物润滑剂结构，并使用TGA技术检查其热稳定性。将生物润滑剂的性能与其他两种生物润滑剂以及四种不同的ISO粘度等级的润滑剂的规格进行了比较。发现生产的生物润滑剂符合ISO VG68粘度等级，具有更好的低温适用性。使用转化反应器模型和非随机两液（NRTL）活度系数模型在Aspen HYSYS程序版本9上进行了过程仿真。仿真结果表明，所研究的生物润滑剂生产工艺具有工业实用性。使用转化反应器模型和非随机两液（NRTL）活度系数模型在Aspen HYSYS程序版本9上进行了过程仿真。仿真结果表明，所研究的生物润滑剂生产工艺具有工业实用性。使用转化反应器模型和非随机两液（NRTL）活度系数模型在Aspen HYSYS程序版本9上进行了过程仿真。仿真结果表明，所研究的生物润滑剂生产工艺具有工业实用性。