Thaiyasuit Prachasanti, Pianthong Kulachate, Worapun Ittipon
Department of Mechanical Engineering, Ubon Ratchathani University, Thailand.
J Oleo Sci. 2012;61(2):81-8. doi: 10.5650/jos.61.81.
This study aims to examine methods and the most suitable conditions for producing methyl ester from crude rubber seed oil. An acid esterification-alkaline transesterification process is proposed. In the experiment, the 20% FFA of crude rubber seed oil could be reduced to 3% FFA by acid esterification. The product after esterified was then tranesterified by alkaline transesterification process. By this method, the maximum yield of methyl ester was 90% by mass. The overall consumption of methanol was 10.5:1 by molar ratio. The yielded methyl ester was tested for its fuel properties and met required standards. The major fatty acid methyl ester compositions were analyzed and constituted of methyl linoleate 41.57%, methyl oleate 24.87%, and methyl lonolenate 15.16%. Therefore, the cetane number of methyl ester could be estimated as 47.85, while the tested result of motor cetane number was 51.20.
本研究旨在考察从粗橡胶籽油生产甲酯的方法和最合适条件。提出了一种酸酯化-碱酯交换工艺。在实验中，通过酸酯化可将粗橡胶籽油中20%的游离脂肪酸（FFA）降低至3%。酯化后的产物再通过碱酯交换工艺进行酯交换。通过这种方法，甲酯的最大产率为90%（质量）。甲醇的总消耗量按摩尔比为10.5:1。对所得甲酯的燃料性能进行了测试，其符合要求的标准。分析了主要脂肪酸甲酯的组成，其中亚油酸甲酯占41.57%，油酸甲酯占24.87%，亚麻酸甲酯占15.16%。因此，甲酯的十六烷值估计为47.85，而发动机十六烷值的测试结果为51.20。
