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Esterification of Free Fatty Acids Derived from Waste Cooking Oil with Octanol: Process Optimization and Kinetic Modeling
Author(s) -
Chowdhury Avisha,
Sarkar Debasish,
Mitra Debarati
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400745
Subject(s) - raw material , lipase , chemistry , candida rugosa , hydrolysis , response surface methodology , lubricant , organic chemistry , catalysis , chemical engineering , chromatography , engineering , enzyme
The synthesis of lubricant‐grade ester using waste cooking oil (WCO) as the primary feedstock is characterized in detail and optimized. WCO was initially hydrolyzed using Candida rugosa lipase to convert triglycerides into free fatty acids (FFA). Subsequently, the FFA were esterified with octanol by a heterogeneous catalytic reaction in batch mode. Both the hydrolysis and esterification steps were optimized in terms of relevant process parameters, employing the well‐known response surface methodology. The final product was characterized by Fourier transform infrared and nuclear magnetic resonance spectroscopy. Moreover, a pseudo‐homogeneous, second‐order kinetic model was proposed and validated with respect to the transient conversion data for the esterification reaction under optimum operating conditions. The overall output of the present study is highly useful in the design and development of large‐scale industrial flow reactors to produce biolubricant components using a domestic waste material as feedstock.