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.2019-05-032019-05-03201718761070https://scholars.lib.ntu.edu.tw/handle/123456789/406431In 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 EngineersBiodiesel productionComposite membraneEsterificationGraphene oxide/chitosan (GO/CS)Pervaporation (PV)Pre-esterificationjournal article10.1016/j.jtice.2017.06.0312-s2.0-85024505593https://www.scopus.com/inward/record.uri?eid=2-s2.0-85024505593&doi=10.1016%2fj.jtice.2017.06.031&partnerID=40&md5=5e42790869c3779179e4fe01032afa2d