Determination of the oxidation stability of biodiesel and oils by spectrofluorimetry and multivariate calibration

Meira, Marilena; Quintella, Cristina M.; Tanajura, Alessandra dos Santos; Silva, Humbervânia Reis Gonçalves da; Fernando, Jaques D’Erasmo Santos; Neto, Pedro Ramos da Costa; Pepe, I. M.; Santos, Mariana Andrade; Nascimento, Luciana Lordêlo

doi:10.1016/j.talanta.2011.04.002

Cited by 61 publications

(30 citation statements)

References 16 publications

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“…Therefore, the degree of oxidation of biodiesel is a major concern for biodiesel producers. The main driving force of the oxidation process is the presence of double bonds 8 in the chemical structure of the mono-alkyl esters. The oxidation process begins with the loss of hydrogen atoms from the chemical structure that subsequently leads to formation of alkyl-radicals.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Approach for Assessing the Oxidation Level of a Biodiesel Sample

Díaz‐Ballote¹,

Gómez-Hernández²,

Vega-Lizama³

et al. 2018

Quim. Nova

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Biodiesel, unlike diesel, is highly susceptible to autoxidation. This autoxidation is a major concern for a biodiesel producer. Various methods have been developed to estimate the degree of oxidative stability of biodiesel. These methods are useful to compare and estimate the oxidative stability between different biodiesel samples. However, an absolute value of the oxidative state will be more useful. In this study, we describe a method of estimating a figure that can be used as an indicator of the oxidation level. This indicator was determined from the thermal decomposition curve of biodiesel, as obtained from the thermogravimetric test. Biodiesel from waste cooking oil was oxidized at 80, 100 and 120 °C using different exposure areas (19.6, 63.6, and 153.9 cm 2 ). The percentage of oxidation, measured from low (80 °C, 19.6 cm 2 ) to highly aggressive conditions (120 °C, 153.9 cm 2 ), was in the range of 0.4 ± 0.1 and 23.5 ± 3.3. Kinematic viscosity was also measured for the oxidized samples, and a strong correlation (R 2 =0.96) was observed between the percentage of oxidation products and kinematic viscosity. In addition, the oxidative effect of temperature and area of exposure on the biodiesel samples was confirmed by ultraviolet spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Thermogravimetric Approach for Assessing the Oxidation Level of a Biodiesel Sample

Díaz‐Ballote¹,

Gómez-Hernández²,

Vega-Lizama³

et al. 2018

Quim. Nova

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“…9,10 Meira et al 11 demonstrated that fluorescence spectroscopy coupled with multivariate analysis can be used as an analytical tool to evaluate the oxidative stability of biodiesel and soybean oil in accordance with the conventional Rancimat method. 11 These authors have also identified the adulteration of biodiesel with vegetable oil using fluorescence spectroscopy. [10][11][12] Biodiesel is chemically defined as a mixture of mono-alkyl esters of long-chain fatty acids (C16-C18) derived from vegetable oils and animal fats.…”

Section: Introductionmentioning

confidence: 99%

“…11 These authors have also identified the adulteration of biodiesel with vegetable oil using fluorescence spectroscopy. [10][11][12] Biodiesel is chemically defined as a mixture of mono-alkyl esters of long-chain fatty acids (C16-C18) derived from vegetable oils and animal fats. It is a domestic renewable fuel for diesel engines and meets the standards and specifications provided by the American Society for Testing and Materials (ASTM D 6751).…”

Section: Introductionmentioning

confidence: 99%

Separation and Identification of Functional Groups of Molecules Responsible for Fluorescence of Biodiesel Using FTIR Spectroscopy and Principal Component Analysis

Silva

Quintella

Meira

2017

J. Braz. Chem. Soc.

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In order to separate and identify functional groups of molecules responsible for fluorescence compounds present in biodiesel, a column chromatography coupled with infrared spectroscopy and multivariate analysis was performed. A biodiesel sample was packed in a chromatographic column and the fractions obtained were used to perform the analyses. Before undergoing the separation process, the biodiesel sample was analyzed by light emitting diode (LED)-induced fluorescence and compared its spectrum with β-carotene and soybean oil patterns. The low cost and speed of analysis suggest that this technique can be used in the separation of biodiesel substances. The fluorescence emission spectra allowed identifying molecules such as β-carotene, in which the spectrum of its pattern exhibited fluorescence within a region ranging from 500 to 700 nm and chlorophyll molecules. When soybean oil is excited at around 405 nm, it features a fluorescent emission band within the region of 670 nm, which reveals the presence of chlorophyll. Infrared spectroscopy coupled with principal component analysis allowed to discriminate the fractions and to identify the functional groups of compounds present in the sample.

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“…O nosso país é o segundo maior produtor deste biocombustível atualmente sendo superado apenas pelos Estados Unidos (MARKET PUBLISHERS, 2014). O biodiesel tem várias vantagens em relação ao diesel, como, biodegradabilidade, lubricidade superior, renovabilidade, não-toxicidade e mínimo teor de enxofre (MEIRA et al, 2011;YUSUF et al, 2011).…”

Section: Introductionunclassified

Prospecção Tecnológica Em Patentes Relacionadas À Produção De Biodiesel

Meira¹,

Filho²,

Silva³

2014

CPROSP

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RESUMOO Brasil é o segundo país produtor de biodiesel e a demanda por este biocombustível deve aumentar nos próximos anos. Considerando a importância do biodiesel para a matriz energética do Brasil e do mundo, este trabalho teve como objetivo fazer um levantamento do estado da técnica de produção do biodiesel levando-se em conta os depósitos de patentes. A China é o país com maior número de depósitos de patentes seguida pelos Estados Unidos e Alemanha. A reação de transesterificação através da catálise alcalina homogênea é a tecnologia mais comum de produção de biodiesel. No entanto, em função de suas desvantagens como a difícil purificação do biodiesel e a geração de efluentes, outras rotas vem sendo propostas, como a catálise heterogênea e o uso do álcool supercrítico.Palavras chave: Produção de Biodiesel. Processos. Patentes. ABSTRACTBrazil is the second producer of biodiesel and the use of this biofuel should increase in coming years. Considering the relevance of biodiesel for the energy matrix of Brazil and of the world, this study aimed to survey the state of the art of biodiesel production taking into account the patent applications. China is the country with the highest number of patent applications followed by the United States and Germany. The transesterification reaction by homogeneous alkaline catalysis is the most common technology for producing biodiesel. However, due to its disadvantages like difficult purification of biodiesel and effluent generation, other routes have been proposed, such as heterogeneous catalysis and the use of supercritical alcohol.

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Determination of the oxidation stability of biodiesel and oils by spectrofluorimetry and multivariate calibration

Cited by 61 publications

References 16 publications

Thermogravimetric Approach for Assessing the Oxidation Level of a Biodiesel Sample

Thermogravimetric Approach for Assessing the Oxidation Level of a Biodiesel Sample

Separation and Identification of Functional Groups of Molecules Responsible for Fluorescence of Biodiesel Using FTIR Spectroscopy and Principal Component Analysis

Prospecção Tecnológica Em Patentes Relacionadas À Produção De Biodiesel

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