Ethyl esters obtained from pequi and macauba oils by transesterification with homogeneous acid catalysis

FUEL

卷:259

Article

Matos dos Santos, Raflem Christian¹  Gurgel, Paula Cristina¹  Pereira, Nizamara Simenremis²  Breves, Rodolfo Andrade³  Rodrigues de Matos, Paulo Roberto⁴  Silva, Luciano Paulino⁵  Araujo Sales, Maria Jose³  Vieira Lopes, Roseany de Vasconcelos⁶ 

[1] Univ Brasilia, Dept Engn Mecan, Campus Darcy Ribeiro, BR-70910900 Brasilia, DF, Brazil

[2] Inst Fed Brasilia, Campus Gama, BR-72405025 Gama, DF, Brazil

[3] Univ Brasilia, Inst Quim, Campus Darcy Ribeiro, BR-70904970 Brasilia, DF, Brazil

[4] Agencia Nacl Petroleo, Gas Nat & Biocombustiveis ANP, Ctr Pesquisas & Anal Tecnol CPT, BR-70830902 Brasilia, DF, Brazil

[5] Embrapa Recursos Genet & Biotecnol, Lab Nanobiotecnol LNANO, BR-70770917 Brasilia, DF, Brazil

[6] Univ Brasilia, Fac Gama, BR-72405610 Gama, DF, Brazil

关键词: Renewable energy;    Biodiesel;    Homogeneous acid catalysis;    Ethyl esters;    Macauba;    Pequi;   

DOI  :  10.1016/j.fuel.2019.116206

来源: Elsevier

【 摘 要 】

In this work, it was investigated the presence of ethyl esters in transesterified pequi (PO) and macailba (MO) oils. To obtain the biodiesel, an acid-catalyzed homogeneous reaction was used. Yields of 95% for MO were obtained using an oil:ethanol ratio of 1:30 and sulfuric acid (H2SO4), reaction times of 4, 8, 12, and 24 h were used. The biodiesel samples obtained from the PO are denoted BP4, BP8, BP12, and BP24, and those from MO are denoted BM4, BM8, BM12, and BM24 according to the reaction time. The kinematic viscosity of the biodiesels was satisfactory and within the specifications stipulated by ANP. The density analysis showed that the biodiesels presented values that are within the limits stipulated by ANP and the European Union. With H-1 NMR measurements, the presence of ethyl esters and the conversion rates were verified. The results by oxidative stability showed that the biodiesel obtained for 24 h are close to the values required by the ANP. The analysis of the ester content showed that the biodiesels obtained with the longest reaction time are in accordance with ANP resolution specifications. Raman spectroscopy revealed the stretching band of the C-O-C group in the ethyl ester molecule at 870 cm(-1) for all samples. Using thermogravimetry, the maximum degradation temperatures were 243 and 205 degrees C for BP and BM, respectively. The characteristic absorption bands of the transesterified oils were identified by FT-IR at 743 cm(-1) (C=O group of the ethyl esters) and 800-1700 cm(-1) (C=O of esters).

【 授权许可】

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