LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

Cordeiro, Claudiney Soares; Silva, Fabiano Rosa da; Marangoni, Rafael; Ramos, Luiz Pereira

doi:10.1007/s10562-012-0819-z

Cited by 15 publications

(11 citation statements)

References 29 publications

(39 reference statements)

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“…The FFA content was obtained using a method presented by Rukunudin et al (1998), adapted from the AOCS 5a-40 method. This method shows good agreement with results obtained by high-performance liquid chromatography (HPLC) (Cordeiro et al, 2012) and nuclear magnetic resonance (NMR) (Zatta et al, 2012a) and was used in several works (Cordeiro et al, 2012;Kanda et al, 2017;Santos et al, 2016;Zatta et al, 2012a). The procedure consists of the titration of the samples with a sodium hydroxide solution (0.1 mol L -1 ), previously standardized with potassium biphthalate.…”

Section: Ffa Content Analysissupporting

confidence: 56%

Preliminary Assessment of the Processing of High-Acidity Fatty Materials Using Solid Catalysts for the Obtainment of Fatty Acid Methyl Esters

Kanda

Hamerski

Corazza

2019

Braz. J. Chem. Eng.

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This work presents the processing of a high-acidity oil through sequential reactions of esterification using montmorillonite K10 and transesterification using zinc monoglycerolate. Since these solids had not been employed along with this approach beforehand, the objective of this work is to provide a general insight of the proposed process and demonstrate its technical feasibility. In this sense, the processing of a synthetic mixture containing soybean oil and lauric acid provided a reduction of the free fatty acid content from (40.8±0.1) % to (3.1±0.4) % after the esterification reaction and a fatty acid methyl ester yield of (95.4±0.2) % was obtained after the transesterification reaction. As compared to traditional homogeneous catalysts, the solid catalysts employed in this work require higher reaction times to achieve satisfactory ester yields but, on the other hand, they are less sensitive to the presence of both water and free fatty acids in the raw materials and can be easily recovered and reused. Therefore, the results accomplished may help the development of a technology for processing high-acidity fatty materials in order to obtain biodiesel, although its economic feasibility still needs a further assessment.

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Section: Ffa Content Analysissupporting

confidence: 56%

Preliminary Assessment of the Processing of High-Acidity Fatty Materials Using Solid Catalysts for the Obtainment of Fatty Acid Methyl Esters

Kanda

Hamerski

Corazza

2019

Braz. J. Chem. Eng.

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“…Re‐use of this material as catalyst gave reproducible yields in three further runs. Later, the same research group tested layered double hydroxides (LDH), containing Zn(II)/Al(III) or Mg(II)/Al(III) in different ratios, in the esterification of fatty acids with methanol [22] . Even in this case, the LDH catalysts resulted deeply modified after the first run: metal carboxylates were recovered, and these materials were separately tested, demonstrating that they are responsible for the observed catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Emerging catalysis in biomass valorisation: simple Zn(II) catalysts for fatty acids esterification and transesterification

Esposito

Melchiorre²,

Annunziata

et al. 2020

ChemCatChem

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The growing concern about global warming and the consumption of fossil fuels has driven in recent decades the use of biomass as a renewable feedstock. In this context, vegetable oils, the corresponding fatty acids (FAs) and esters (FAEs) have primary importance: their esterification and transesterification lead to innovative products, that find application in several sectors, from biofuels to solvents, from surfactants to cosmetic ingredients and plasticizers. Lewis acid catalysis represents the most accredited methodology for developing processes of esterification and transesterification in line with sustainability requirements. The results available so far reveal the prevalent catalytic role of Zn(II) salts and coordination compounds, due to their beneficial eco-toxicological profile, combined with an appropriate acidity, finely tunable through selective functionalization. This review provides a picture of the state of the art in this important sector of biomass valorization. Roberto Esposito received his PhD in Chemical Sciences in 2018 at the University of Naples Federico II under the supervision of prof. F. Ruffo. He is researcher at the Department of Chemical Science of the University of Naples Federico II and his main research topics are W (VI), Zn(II) and Fe(III) based catalysts for conversion of biomasses and chemistry of tetra-coordinated and penta-coordinated complexes of Pt(II). Massimo Melchiorre graduated in Chemical Sciences in 2018. He is Board Member of ISusChem s.r.l., innovative start-up and university spin-off at the Dipartimento di Scienze Chimiche of the Università di Napoli Federico II. Company activity consists in biomass conversion and bio-based products development.

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“…Os sólidos utilizados como catalisadores neste trabalho para a interesterificação do óleo de soja refinado com acetato de metila correspondem ao hidróxido duplo lamelar Zn 2 Al/NO 3 e o estearato de zinco comercial, este último um carboxilato lamelar. Estes materiais possuem atividade catalítica comprovada em processos de transesterificação e esterificação [15][16][17][18][19][20]. Porém, considerando que os autores não encontraram trabalhos análogos na literatura, pode-se dizer que é a primeira vez que estes sólidos são testados como catalisadores em reações de interesterificação para produção de biodiesel e triacetina.…”

Section: Figuraunclassified

“…A temperatura de precipitação foi de 45 °C. A síntese foi conduzida em atmosfera de nitrogênio e a fração sólida obtida foi lavada com água e seca a 70 °C até massa constante [17,21].…”

Section: Métodosunclassified

Estudos preliminares da interesterificação do óleo de soja com acetato de metila catalisada por materiais lamelares

Useda

Cordeiro

2020

Matéria (Rio J.)

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RESUMO A substituição parcial do óleo diesel pelo biodiesel tem contribuído para o aumento da disponibilidade de glicerina no mercado mundial. Cerca de 10 m3 e glicerina são obtidos para cada 100 m3 de triacilglicerídeos (principal componente de óleos vegetais e gorduras animais) processados na principal rota tecnológica para produção do biodiesel, a transesterificação alcalina em meio homogêneo. Naturalmente, a glicerina obtida como coproduto no processo precisa ser aproveitada em processos complementares. Isso usualmente é possível após a glicerina passar por vários processos de purificação. Com a intenção de evitar tais processos complementes para aproveitamento da glicerina, estamos propondo a síntese do biodiesel por interesterificação do óleo de soja com acetato de metila, uma rota tecnológica que possibilita a obtenção da glicerina na forma de triacetina, ou seja, já quimicamente modificada. Os catalisadores utilizados no processo foram o hidróxido duplo lamelar (HDL) Zn2 Al/NO3 e o estearato de zinco comercial (EZ), um carboxilato lamelar. Ambos estes materiais lamelares ainda não haviam sido testados como catalisadores em reações de interesterificação. Foram obtidas conversões em ésteres metílicos de ácidos graxos de 50,8±4,2 % e 82,9±1,0 % (m m-1) utilizando os catalisadores EZ e HDL, respectivamente; quando as reações foram conduzidas utilizando 5 % de catalisador (m m-1), por 10 h de reação e razão molar acetato de metila: óleo de soja de 24:1.

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LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

Cited by 15 publications

References 29 publications

Preliminary Assessment of the Processing of High-Acidity Fatty Materials Using Solid Catalysts for the Obtainment of Fatty Acid Methyl Esters

Preliminary Assessment of the Processing of High-Acidity Fatty Materials Using Solid Catalysts for the Obtainment of Fatty Acid Methyl Esters

Emerging catalysis in biomass valorisation: simple Zn(II) catalysts for fatty acids esterification and transesterification

Estudos preliminares da interesterificação do óleo de soja com acetato de metila catalisada por materiais lamelares

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