Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6631183 | Fuel | 2018 | 10 Pages |
Abstract
This work reports experimental and kinetic modeling of the coupled esterification and transesterification reactions ((trans)esterification) of a model acid oil (a mixture of soybean oil and oleic acid) using ethanol at sub and supercritical conditions in a continuous tubular reactor. Process variables, namely temperature (220-350â¯Â°C), pressure (100-200â¯bar) and ethanol to acid oil molar ratio (2:1-20:1) as well as the effect of the initial amount of free fatty acids in the raw material were studied. The best condition for the ethylic supercritical (trans)esterification of soybean oil with 20â¯wt% of oleic acid was 280â¯Â°C, 100â¯bar, and ethanol to acid oil molar ratio of 4:1, where 80% of ester yield was reached in 60â¯min. It was observed that increasing the free fatty acid content increased the reaction rate and reaction yield. The proposed autocatalytic kinetic model presented a good fit in relation to the experimental data.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Kallynca Carvalho dos Santos, Fabiane Hamerski, Fernando A. Pedersen Voll, Marcos L. Corazza,