https://scholars.lib.ntu.edu.tw/handle/123456789/406431
Title: | Biodiesel production by pervaporation-assisted esterification and pre-esterification using graphene oxide/chitosan composite membranes | Authors: | Lin Y.-K. Nguyen V.-H. Yu J.C.-C. Lee C.-W. Deng Y.-H. Wu J.C.S. Wu K.C.W. Tung K.-L. Chen C.-L. |
Keywords: | Biodiesel production;Composite membrane;Esterification;Graphene oxide/chitosan (GO/CS);Pervaporation (PV);Pre-esterification | Issue Date: | 2017 | Journal Volume: | 79 | Start page/Pages: | 23-30 | Source: | Journal of the Taiwan Institute of Chemical Engineers | Abstract: | In this study, a series of novel graphene oxide/chitosan (GO/CS) composite membranes was successfully synthesized and fully characterized. The performance of GO/CS composite membrane was then evaluated by integrating with the esterification of acetic acid with ethanol or the pre-esterification of palmitic acid with methanol, both essential in biodiesel production. Typically, esterification and pre-esterification are reversible reactions, which are limited by chemical equilibrium, resulting in a low product yield. In our study, reaction and separation were conducted in two separated steps or in a single one by means of a catalytic membrane. The preferential removal of water through the membrane in a PV-assisted process enhanced the conversion. The results show clearly that temperature, wt% of embedded GO within a polymeric CS-based membrane, and initial ratio of alcohol/acid are important parameters to enhance conversion because it acts on the kinetics of both pervaporation and esterification/pre-esterification. The enhanced catalytic membrane of the PV-assisted pre-esterification can only be observed when a proper amount of Amberlyst-15 catalyst is used. Additionally, the results of PV-assisted esterification/pre-esterification show that the ratio of water removal (by membrane) and water production (by esterification) rates play a significant role in evaluating the catalytic membrane. Under specific conditions, the conversions of PV-assisted esterification and pre-esterification by the catalytic membrane could be higher than those without PV-assisted up to 8% and 20%, respectively. This process could offer a key technology for biodiesel production in the future. ? 2017 Taiwan Institute of Chemical Engineers |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406431 | ISSN: | 18761070 | DOI: | 10.1016/j.jtice.2017.06.031 |
Appears in Collections: | 化學工程學系 |
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