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ISSN 2320-5407 International Journal of Advanced Research (2015), Volume 3, Issue 6, 965-972



Optimization of Biodiesel production in Spinning disc Reactor using Response Surface Methodology

*Vishnu Ashroba Gite 1, and Y.C. Bhattacharyulu 2

1. Department of chemical Engineering, MGM’S Jawaharlal Nehru Engineering College, Aurangabad (M.S.), India

2. Department of chemical Engineering, Anuradha Engineering College Chikhli Dist Buldana, Maharashtra, India

Manuscript Info Manuscript History:

Received: 19 April 2015 Final Accepted: 22 May 2015 Published Online: June 2015

Key words:

Biodiesel, Spinning Disc Reactor,Transesterification,


An experiment was performed to study Transesterification in spinning disc reactor using response surface methodology. Spinning disc reactor have been fabricated and used for continuous alkali-catalyzed transesterification biodiesel production. The reactor was designed with a 110 mm diameter circular disc made of stainless steel as a static disc and another disc of same dimension made up of high density polyethylene to serve as rotating disc, enclosed on cylindrical vessel made of plexi-glass. The small gap sizes about 1 millimeter between static disc and rotating disc were maintained. The parameters for biodiesel preparation are studied with a response surface methodology (RSM) in this, central composite design (CCD) was used. This method is suitable for fitting the quadratic surface and it helps to optimize the effective parameters with a minimum number of experiments, and also to analyze the interaction between the parameters. The variables studied 1) A: reaction temperature 2) B: Flow Rate of oil and 3) C: catalyst concentration. Mole ratio of oil to methanol was fixed 1:6 by carrying various experiments.

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response (RSM).



*Corresponding Author Vishnu Ashroba Gite


Transesterification is a common method for biodiesel production from vegetable oils and animal fats and usually preferred instead of direct esterification [1]. In transesterification or alcoholysis, fats or oils react with alcohol in presence of a catalyst to form alky esters and glycerol [2]. The transesterification process reduces the viscosity of oils which is higher than petro-diesel [3]. Selecting a suitable alcohol and catalyst is important for transesterification method. Various alcohols such as methanol, butanol, ethanol, propanol and amyl alcohol can be used for transesterification. Methanol is used widely because it is relatively cheaper than other alcohols and has chemical and physical advantages over other alcohols [4]. In theory 3 moles of alcohols are required to neutralize 1 mole of triglyceride to produce 3 moles of fatty acid methyl ester (FAME) and 1 mole of glycerin [5]. A good catalyst is also needed to obtain a reasonable rate for transesterification of triglycerides and its conversion to biodiesel [6]. Acid and alkaline catalysts can be used in the form of homogeneous or heterogeneous catalysts for transesterification process [7]. Research and industry prefer alkali catalysts, such as NaOH and KOH because alkali catalysts react faster and are less corrosive than acidic compounds [8]. High water and free fatty acid in oil reduce the effectiveness of catalysts, produce soap and require considerable amounts of catalysts. Free fatty acids (FFAs) and water in oil needs to be removed before applying base catalysis process. Acid catalyst was used to eliminate the above-mentioned problems. acid catalysts act better than base catalysts, because acid catalysts are able to convert higher percentage of free fatty acids (FFAs) to triglyceride. The first choice for acid catalysts is sulfuric acid which was used by several researchers [9]. In addition to the acid and base catalysts, enzyme catalysts are also considered for biodiesel production. The enzyme catalysts are gaining more interest in recent years because they don’t constitute soap and


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