Production of biodiesel from waste bio-oil through ultrasound assisted transesterification using immobilized lipase

In this study, process intensification was carried out using lipase catalyzed transesterification of waste cottonseed oil (WCSO) with ethanol in the presence of ultrasonication. A maximum conversion of 98.7% was observed for ultrasound assisted transesterification. The optimum process conditions wer...

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Bibliographic Details
Published in:Environmental technology & innovation 2021-02, Vol.21, p.101199, Article 101199
Main Authors: Yasvanthrajan, Natarajan, Sivakumar, Pandian, Muthukumar, Karuppan, Murugesan, Thanabalan, Arunagiri, Appusamy
Format: Article
Language:English
Subjects:
Immobilized Rhizopus oryzae lipase
Transesterification
Ultrasonication
Waste cottonseed oil
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Summary:In this study, process intensification was carried out using lipase catalyzed transesterification of waste cottonseed oil (WCSO) with ethanol in the presence of ultrasonication. A maximum conversion of 98.7% was observed for ultrasound assisted transesterification. The optimum process conditions were ethanol to oil molar ratio of 4.5:1, a reaction temperature of 45°C, enzyme loading of 5 wt%, a reaction time of 6 h, ultrasonic amplitude of 40% and the duty cycle of 15 s ON and 15 s OFF. The influence of ultrasound makes the process efficient because of an effective reduction in reaction time to 6 h with the least catalyst dosage and power consumption. Reusability tests of the catalyst were conducted after separating the immobilized Rhizopus oryzae lipase. The regenerated lipase catalyst was found to have better reusability up to the fourth cycle and the produced biodiesel was within the ASTM D6751 standard. Furthermore, the ultrasound assisted process under mild operating conditions did not affect the immobilized enzyme. It was clearly observed that ultrasonication is faster and effective for biodiesel conversion using the immobilized lipase catalyzed transesterification reactions. [Display omitted] •Waste cottonseed oil can be a potential feedstock for biodiesel production.•Ultrasonic assisted transesterification gives better conversion than conventional process.•Maximum conversion of 98.7% is achieved at the optimum conditions.•Reusability of the catalyst is possible and the studies are carried out.
ISSN:2352-1864
2352-1864
DOI:10.1016/j.eti.2020.101199