Biodiesel production from waste vegetable oils over MgO/Al2O3 catalyst
- Authors: Sithole, Thembi , Jalama, Kalala , Meijboom, Reinout
- Date: 2014
- Subjects: Waste vegetable oils , Biodiesel fuels industry , Vegetable oils as fuel , Vegetable oils - Industrial applications
- Type: Article
- Identifier: uj:5029 , ISSN 1662-7482 , http://hdl.handle.net/10210/13549
- Description: MgO/Al2O3 catalysts with 10 and 20 wt.% MgO loadings have been prepared by incipient wetness impregnation method. A low-surface area alumina with small pore sizes was used as catalyst support to stabilise most of the MgO particles on the external surface area of the support. The prepared catalysts were subsequently tested in the conversion of a waste vegetable oil to biodiesel. The waste vegetable oil conversion was found to increase with the increase in reaction temperature, reaction time and MgO loading in the catalyst.
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Energy requirement estimates for two step ethanolysis of waste vegetable oils for biodiesel production
- Authors: Ligeris, Nikolas , Jalama, Kalala
- Date: 2014
- Subjects: Waste vegetable oils , Biodiesel , Ethanol
- Type: Article
- Identifier: uj:5052 , http://hdl.handle.net/10210/13591
- Description: ChemCad 6.4 simulation package was used to model a two-step biodiesel production process from waste vegetable oils (WVO) and ethanol using homogeneous acid and alkali catalysts respectively. The developed process flowsheet consisted of pre-esterification and transesterification of WVO, ethanol and glycerol recovery, and biodiesel refining. The energy required for each processing unit as well as the energy required for the whole process have been estimated. Ethanol recovery accounted for the highest portion of the energy required for the entire process estimated as 2.75 MJ per kg of biodiesel produced.
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