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Molecules. 2018 Dec 28;24(1). pii: E94. doi: 10.3390/molecules24010094.

High-Quality Biodiesel Production from Buriti (Mauritia flexuosa) Oil Soapstock.

Author information

1
Laboratory of Catalysis and Oil-Chemistry, Graduate Program in Chemistry, Institute of Exact and Natural Sciences, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. samanthasiqueira08@yahoo.com.br.
2
Laboratory of Oils of the Amazon, Institute of Biological Sciences, Graduate Program in Biotechnology, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. vanessadmescouto@gmail.com.
3
Laboratory of Catalysis and Oil-Chemistry, Graduate Program in Chemistry, Institute of Exact and Natural Sciences, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. emmerson@ufpa.br.
4
Laboratory of Catalysis and Oil-Chemistry, Graduate Program in Chemistry, Institute of Exact and Natural Sciences, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. zamian@ufpa.br.
5
Laboratory of Catalysis and Oil-Chemistry, Graduate Program in Chemistry, Institute of Exact and Natural Sciences, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. narciso@ufpa.br.
6
Laboratory of Catalysis and Oil-Chemistry, Graduate Program in Chemistry, Institute of Exact and Natural Sciences, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. adrlui1@yahoo.com.br.
7
Laboratory of Oils of the Amazon, Institute of Biological Sciences, Graduate Program in Biotechnology, Federal University of Pará, Belém, Pará, CEP 66075-110, Brazil. adrlui1@yahoo.com.br.

Abstract

The buriti palm (Mauritia flexuosa) is a palm tree widely distributed throughout tropical South America. The oil extracted from the fruits of this palm tree is rich in natural antioxidants. The by-products obtained from the buriti palm have social and economic importance as well, hence the interest in adding value to the residue left from refining this oil to obtain biofuel. The process of methyl esters production from the buriti oil soapstock was optimized considering acidulation and esterification. The effect of the molar ratio of sulfuric acid (H₂SO₄) to soapstock in the range from 0.6 to 1.0 and the reaction time (30⁻90 min) were analyzed. The best conditions for acidulation were molar ratio 0.8 and reaction time of 60 min. Next, the esterification of the fatty acids obtained was performed using methanol and H₂SO₄ as catalyst. The effects of the molar ratio (9:1⁻27:1), percentage of catalyst (2⁻6%) and reaction time (1⁻14 h) were investigated. The best reaction conditions were: 18:1 molar ratio, 4% catalyst and 14 h reaction time, which resulted in a yield of 92% and a conversion of 99.9%. All the key biodiesel physicochemical characterizations were within the parameters established by the Brazilian standard. The biodiesel obtained presented high ester content (96.6%) and oxidative stability (16.1 h).

KEYWORDS:

Mauritia flexuosa; biodiesel; esterification; vegetable oil; waste valorization

PMID:
30597829
PMCID:
PMC6337549
DOI:
10.3390/molecules24010094
[Indexed for MEDLINE]
Free PMC Article

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