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Caprolactam-Based Brønsted Acidic Ionic Liquids for Biodiesel Production from Jatropha Oil

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
Author to whom correspondence should be addressed.
Catalysts 2017, 7(4), 102;
Received: 21 February 2017 / Revised: 20 March 2017 / Accepted: 23 March 2017 / Published: 27 March 2017
(This article belongs to the Special Issue Organocatalysis in Ionic Liquids)
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Caprolactam-based ionic liquids show many advantages, such as the lower toxicity, lower cost, and a simple preparation process. In this work, caprolactam-based ionic liquids were prepared and adopted as catalysts for the transesterification of Jatropha oil with methanol. The results demonstrated that the SO3H-functional caprolactam‐based ionic liquids have higher catalytic activity than those of the caprolactam-based ionic liquids without sulfonic group or the SO3H-functional pyridine-based ionic liquids, attributed to their stronger Brønsted acidity. By optimizing the reaction parameter, the biodiesel yield catalyzed by 1-(4-sulfonic group) butylcaprolactamium hydrogen sulfate ([HSO3-bCPL][HSO4]) could reach above 95% at 140 °C for 3 h. Furthermore, the ionic liquid had a good reusability. View Full-Text
Keywords: biodiesel; caprolactam-based ionic liquid; transesterification; acidity biodiesel; caprolactam-based ionic liquid; transesterification; acidity

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Luo, H.; Yin, H.; Wang, R.; Fan, W.; Nan, G. Caprolactam-Based Brønsted Acidic Ionic Liquids for Biodiesel Production from Jatropha Oil. Catalysts 2017, 7, 102.

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