Waste cooking oil was converted to biodiesel using a parabolic trough collector using solar radiations as a heating source and a parabolic trough collector as an intensifier. Calcium oxide (CaO) derived from seashells was used as a catalyst in order to boost the rate of the reaction. Temperatures of almost 95 °C were reached using this collector although the temperature was limited to below 78.4 °C in order to prevent the vaporization of ethanol. The influence of different parameters on the reaction was analyzed. The maximum yield was found to be 95.84%, obtained under conditions of 180 LPH reactant flow rate, 300 rpm stirring speed, 60 minutes reaction time, 9:1 ethanol to oil ratio and 90 cm catalyst bed height. The composition and properties of the biodiesel were found to be in accordance with literature and ASTM and BIS norms. The energy efficiency of the process was analyzed by net energy ratio (NER). The net energy efficiency index (NEEI) was obtained from the ratio of NER of the solar method to the conventional method. NEEI of the process was found to be 4.16, thereby making the process a highly promising method of biodiesel production.

使用抛物线槽式集热器，以太阳辐射为加热源，抛物线槽式集热器为增强器，将废食用油转化为生物柴油。为了提高反应速度，使用了贝壳衍生的氧化钙（CaO）作为催化剂。使用该收集器达到了将近95°C的温度，尽管为了防止乙醇蒸发，温度被限制在78.4°C以下。分析了不同参数对反应的影响。发现最大产率为95.84％，是在180 LPH反应物流速，300 rpm搅拌速度，60分钟反应时间，9：1乙醇与油的比例和90 cm催化剂床高的条件下获得的。发现生物柴油的组成和性质符合文献以及ASTM和BIS规范。该过程的能源效率通过净能量比（NER）进行分析。净能效指数（NEEI）由太阳能法与传统方法的NER比率得出。发现该方法的NEEI为4.16，从而使该方法成为高度有前途的生物柴油生产方法。