Applied Ecology and Environmental Sciences
ISSN (Print): 2328-3912 ISSN (Online): 2328-3920 Website: Editor-in-chief: Alejandro González Medina
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Applied Ecology and Environmental Sciences. 2019, 7(5), 168-175
DOI: 10.12691/aees-7-5-2
Open AccessArticle

Study of Eggshell as Precursor of a Heterogeneous Catalyst in One Step Neutralization and Transesterification Reactions of Acid Macauba and Soybean Oil

Gustavo P. dos Reis1, Claudia Cristina Cardoso2, , Fabiana Pereira de Sousa1 and Vânya M. D. Pasa1

1Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte/MG, Brazil.

2Departamento de Química, Universidade Federal Rural de Pernambuco, Recife/PE, Brazil

Pub. Date: October 29, 2019

Cite this paper:
Gustavo P. dos Reis, Claudia Cristina Cardoso, Fabiana Pereira de Sousa and Vânya M. D. Pasa. Study of Eggshell as Precursor of a Heterogeneous Catalyst in One Step Neutralization and Transesterification Reactions of Acid Macauba and Soybean Oil. Applied Ecology and Environmental Sciences. 2019; 7(5):168-175. doi: 10.12691/aees-7-5-2


Biodiesel is an important biofuel used worldwide as a total or partial substitute for fossil diesel. Many studies have been developed to reduce their costs, specially using acid oils as waste oil and inexpensive heterogeneous catalysts. CaO obtained from calcinated waste eggshells has been the object of study of this work to produce biodiesel using neutral soybean oil (<1.0 mg KOH/g) and high-acidity soybean oil (9.5 mg KOH/g) and macauba oil (20.0 mg KOH/g). A preliminary study of transesterification of neutral soybean oil with methanol in a molar ratio of oil:alcohol 1:12 in 3% of CaO-egg reached conversion 95% of FAME after 4 h of reflux. The progress of the reaction was analyzed both quantitatively by 1H NMR, as qualitatively by HPLC. The resultant biodiesel has met the international specifications as the kinematic viscosity and density, with values 4.37 mm2/s and 885.8 kg/m3, respectively. The study of breakthrough of the reaction between the doped acid soybean oil in the presence of methanol in a molar ratio of oil:alcohol 1:18, using 3% (w/w) CaO-egg indicated that the oil triglyceride only begins to be transesterified after all the neutralization of FFA. After 6 h of reflux the FAME conversion was of 96%. Using the same reaction conditions, while using the acid macauba oil, the FAME content was of 94%. The results showed the efficiency of CaO-egg for simultaneous neutralization/transesterification reaction for high-acidity oil, in only one step reaction.

eggshell biodiesel high-acidity oil heterogeneous catalyst macauba oil

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