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Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification

Journal

RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume 32, Issue -, Pages 1-15

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.rser.2014.01.005

Keywords

Alkali-catalyzed transesterification; Biodiesel Dry washing; Ionic liquids; Membrane separation; Purification; Wet washing

Funding

  1. Ministry of Education, Science and Technological Development of the Republic of Serbia [III 45001]

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For commercial application, the ester product of alkali-catalyzed transesterification of vegetable oil or animal fats should be refined after glycerol separation by settling to fulfill the biodiesel standard specifications. This crude biodiesel, after neutralization and methanol removal, should be further cleaned by either one of the following methods: wet washing, dry washing, membrane extraction or using ion liquids. This paper presents a review on the traditional (wet and dry washing) and novel (membrane separation technology and usage of ion liquids) methods of crude biodiesel purification. It also provides a comparison of crude biodiesel purification methods. Each method has its advantages and disadvantages, which should be carefully analyzed when choosing the proper one for refining crude biodiesel. (C) 2014 Elsevier Ltd. All rights reserved.

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