Microwave Assisted Energy Efficient Biodiesel Production from Crude Pongamia pinnata (L.) Oil Using Homogeneous Catalyst

Journal of forest and environmental science Pub Date : 2015-02-28 DOI:10.7747/JFES.2015.31.1.1

Ritesh Kumar, A. Sethy

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引用次数: 2

Abstract

Abstract Microwave assisted biodiesel production from crude Pongamia pinnata oil using homogeneous base catalyst (KOH) was unsuccessful because of considerable soap formation. Therefore, a two step process of biodiesel production from high free fatty acid (FFA) oil was investigated. In first step, crude P. pinnata oil was acid catalyzed using H 2 SO 4 and acid value of oil was reduced to less than 4 mg KOH/g. Effect of sulfuric acid concentration, alcohol-oil molar ratio and microwave irradiation time on acid value of oil was studied. Result suggested that 1.5% H 2 SO 4 (w/w), 6：1 methanol oil molar ratio and 3 min microwave irradiation time was sufficient to reduce the acid value of oil from 12 and 22 mg KOH/g to 2.9 and 3.9 mg/KOH/g, respectively. Oil obtained after pretreatment was subsequently used for microwave assisted alkali catalyzed transesterification. A higher biodiesel yield (99.0%) was achieved by adopting two step processes. Microwave energy efficiency during alkali catalyzed transesterification was also investigated. The results suggested a significant energy saving because of reduced reaction time under microwave heating.Key Words: microwave, pongamia pinnata, biodiesel, acid value, energy efficiency

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微波辅助下制备高能效原石蓬生物柴油使用均相催化剂的油

摘要:微波辅助下，以均相碱催化剂(KOH)为原料制备小绒滨油制备生物柴油是不成功的，因为它会产生大量的肥皂。为此，研究了高游离脂肪酸(FFA)油制备生物柴油的两步法工艺。第一步，用h2so4对石首油进行酸催化，使石首油的酸值降至4 mg KOH/g以下。研究了硫酸浓度、醇油摩尔比和微波辐照时间对油脂酸值的影响。结果表明，1.5%的h2so4 (w/w)、6:1的甲醇油摩尔比和3 min的微波辐照时间足以使油的酸值分别从12和22 mg KOH/g降低到2.9和3.9 mg/KOH/g。预处理后得到的油随后用于微波辅助碱催化酯交换反应。采用两步法，生物柴油的产率可达99.0%。对碱催化酯交换过程中的微波能量效率进行了研究。结果表明，由于微波加热缩短了反应时间，因此显著节能。关键词:微波，棘豆，生物柴油，酸值，能效

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Journal of forest and environmental science

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