Comparison Of Novozyme 435 And Purolite D5081 As Heterogeneous Catalysts For The Pretreatment Of Used Cooking Oil For Biodiesel Production

Sumaiya, Zainal Abidin and Haigh, Kathleen F. and Vladisavljević, Goran T. and Saha, Basudeb (2013) Comparison Of Novozyme 435 And Purolite D5081 As Heterogeneous Catalysts For The Pretreatment Of Used Cooking Oil For Biodiesel Production. Fuel, 111. pp. 186-193. ISSN 0016-2361. (Published)

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DOI/Official URL: http://dx.doi.org/10.1016/j.fuel.2013.04.056

Abstract

The catalytic performance of two types of catalysts, an ion-exchange resin, Purolite D5081 and an immobilised enzyme, Novozyme 435, was compared for the esterification pretreatment of used cooking oil (UCO) for the preparation of biodiesel. The reactions were carried out using a jacketed batch reactor with a reflux condenser. The effect of mass transfer limitations was investigated and it was shown that internal and external mass transfer limitations were negligible. An immobilised enzyme, Novozyme 435, was investigated because it has been shown to give high free fatty acids (FFAs) conversion. This catalyst has been compared to an ion-exchange resin, Purolite D5081, which was developed for the esterification of UCO for the production of biodiesel. It was found that a conversion of 94% was achieved using Purolite D5081 compared to 90% conversion with Novozyme 435. However, the optimum methanol to FFA ratio for Purolite D5081 was 98:1 compared to 6.2:1 for Novozyme 435. In addition, it has been found that with Novozyme 435 there are side reactions which result in the formation of additional fatty acid methyl esters (FAMEs) and FFAs at longer reaction times.

Item Type:	Article
Uncontrolled Keywords:	Biodiesel; Fatty acid methyl esters (FAMEs); Free fatty acids (FFAs); Esterification; Novozyme 435
Subjects:	T Technology > TP Chemical technology
Faculty/Division:	Faculty of Chemical & Natural Resources Engineering
Depositing User:	Mrs. Neng Sury Sulaiman
Date Deposited:	06 Aug 2014 07:42
Last Modified:	18 Apr 2018 01:21
URI:	http://umpir.ump.edu.my/id/eprint/6283
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