A rapid enzyme-catalyzed pretreatment of the acidic oil of macauba (Acrocomia aculeata) for chemoenzymatic biodiesel production

A rapid enzyme-catalyzed pretreatment of the acidic oil of macauba (Acrocomia aculeata) for chemoenzymatic biodiesel production

[Display omitted] •Acrocomia aculeata is a promising feedstock for biodiesel production.•Lipozyme 435 (5% w/w) reduced 91.5% of macauba oil acidity in 4h.•Enzyme was robust at a broad temperature range (20–45°C).•Concomitant esterification and transesterification was observed. Macauba (Acrocomia acu...

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Bibliographic Details
Published in:Process biochemistry (1991) Vol. 53; pp. 188 - 193
Main Authors: Teixeira, Danielle Altomari, da Motta, César Rezende, Ribeiro, Claudia Maria Soares, de Castro, Aline Machado
Format: Journal Article
Language:English
Published: Barking Elsevier Ltd 01-02-2017
Elsevier BV
Subjects:
Acidic oil
Acidity
Acrocomia aculeata
Biocatalysts
Biodiesel
Biodiesel fuels
Biofuels
Biomass
Chemical synthesis
Diesel
Enzymatic esterification
Esterification
Esters
Fatty acid methyl esters
Fatty acids
Free fatty acid
Glycerides
Industrial plants
Lipase
Moisture content
NMR
Nuclear magnetic resonance
Oil
Plants (botany)
Pretreatment
Transesterification
Water content
Free fatty acid
Lipase
Enzymatic esterification
Acrocomia aculeata
Biodiesel
Acidic oil
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Summary:[Display omitted] •Acrocomia aculeata is a promising feedstock for biodiesel production.•Lipozyme 435 (5% w/w) reduced 91.5% of macauba oil acidity in 4h.•Enzyme was robust at a broad temperature range (20–45°C).•Concomitant esterification and transesterification was observed. Macauba (Acrocomia aculeata) is a plant with high potential of oil supply for biodiesel production. However, the high acidity (35–43%) of this oil disqualifies it from use in industrial biodiesel production plants that use alkaline transesterification as the synthesis reaction. Thus, technologies such as the use of biocatalysts to reduce oil acidity are necessary to better monetize the carbon present in that biomass. In the present study, a commercial lipase (Lipozyme 435) was used for the esterification of free fatty acids (FFAs) in the oil to reduce the acidity. Lipozyme 435 performed well under broad temperature (20–45°C) and water content (560–30000ppm) ranges, and its performance was maximized in a substrate (methanol:FFA) molar ratio of 2. The lowest final FFA content achieved was 1.09%, corresponding to a global conversion rate of 97.22%. The fatty acid methyl esters content in the treated oil (55%), determined by 13C NMR, indicated that Lipozyme 435 can also catalyze the transesterification of the glycerides in the oil. The versatility under different operational conditions and stability over long use (up to 150 times) indicated that Lipozyme 435 is a very suitable biocatalyst for the proposed process, contributing to a better economic attractive option.
ISSN:1359-5113
1873-3298
DOI:10.1016/j.procbio.2016.12.011