Chemical Engineering and Science
ISSN (Print): 2328-7381 ISSN (Online): 2328-7373 Website: http://www.sciepub.com/journal/ces Editor-in-chief: Apply for this position
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Chemical Engineering and Science. 2013, 1(2), 22-26
DOI: 10.12691/ces-1-2-2
Open AccessArticle

Synthesis of Biodiesel from Waste Cooking Oil

M. Rakib Uddin, , Kaniz Ferdous, M. Rahim Uddin, Maksudur R. Khan and M. A. Islam

Pub. Date: April 11, 2013

Cite this paper:
M. Rakib Uddin, Kaniz Ferdous, M. Rahim Uddin, Maksudur R. Khan and M. A. Islam. Synthesis of Biodiesel from Waste Cooking Oil. Chemical Engineering and Science. 2013; 1(2):22-26. doi: 10.12691/ces-1-2-2

Abstract

In the present study biodiesel was synthesized from Waste Cook Oil (WCO) by three-step method and regressive analyzes of the process was done. The raw oil, containing 1.9wt% Free Fatty Acid (FFA) and viscosity was 47.6mm2/s. WCO was collected from local restaurant of Sylhet city in Bangladesh. Transesterification method gives lower yield than three-step method. In the three-step method, the first step is saponification of the oil followed by acidification to produce FFA and finally esterification of FFA to produce biodiesel. In the saponification reaction, various reaction parameters such as oil to sodium hydroxide molar ratio and reaction time were optimized and the oil to NaOH molar ratio was 1:2, In the esterification reaction, the reaction parameters such as methanol to FFA molar ratio, catalyst concentration and reaction temperature were optimized. Silica gel was used during esterification reaction to adsorb water produced in the reaction. Hence the reaction rate was increased and finally the FFA was reduced to 0.52wt%. A factorial design was studied for esterification reaction based on yield of biodiesel. Finally various properties of biodiesel such as FFA, viscosity, specific gravity, cetane index, pour point, flash point etc. were measured and compared with biodiesel and petro-diesel standard. The reaction yield was 79%.

Keywords:
saponification acidification esterification factorial design biodiesel

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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