Esterification of mandelic acid catalyzed by heteropoly acid

Rafiee, Ezzat; Joshaghani, Mohammad; Tork, Fariba; Fakhri, Akram; Eavani, Sara

doi:10.1016/j.molcata.2007.11.029

Cited by 26 publications

(18 citation statements)

References 27 publications

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“…Microwave has proven more interesting than traditional methods for the alcoholysis with methanol of triglycerides allowing better yields and conversions into fatty acids methyl esters in a short time and, consequently, less energy consumption (Park et al, 2008;Meszaros et al, 2009). The present procedure represents a clean, practical, simple, mild, time-saving, and eco-friendly method for synthesis of biodiesel in short reaction times (Rafiee et al, 2008). Maize oil methyl ester was successfully produced by microwave assisted transesterification reaction.…”

Section: Resultsmentioning

confidence: 96%

Microwave Assisted Transesterification of Maize (Zea Mays L.) Oil as a Biodiesel Fuel

Öztürk

Kafadar

Duz

et al. 2010

Energy Exploration & Exploitation

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Maize (Zea mays L.) oil is a highly valuable agricultural commodity for the Turkey. Transesterified maize oil has the global better properties because it has the greater monounsaturated content. Biodiesel has been prepared from maize by transesterification of the crude oil under microwave irradiation, with methanol to oil molar ratio of 10:1, in the presence of 1.5% NaOH as catalyst and 5 minutes time, the conversion of maize oil to methyl ester was over 98%. Compared with conventional heating methods, the process using microwaves irradiation proved to be a faster method for alcoholysis of triglycerides with methanol, leading to high yields of biodiesel.

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Section: Resultsmentioning

confidence: 96%

Microwave Assisted Transesterification of Maize (Zea Mays L.) Oil as a Biodiesel Fuel

Öztürk

Kafadar

Duz

et al. 2010

Energy Exploration & Exploitation

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“…A Figura 2 mostra o difratograma do catalisador após limpeza com etanol. O padrão de difração evidencia a prevalência de uma fase amorfa, com pequenos picos de difração que não podem ser atribuídos ao H 3 PW 12 O 40 e sim ao seu produto de decomposição térmica (WO 3 ). 25 Todos os parâmetros antes e após recuperação indicam boa estabilidade e capacidade de reuso, pois não há comprometimentos estrutural, mecânico e químico do catalisador, indicados pela manutenção da atividade catalítica em média de 54%, conforme também verificado em Dias et al.…”

Section: Estabilidade E Recuperação Dos Catalisadoresunclassified

“…Nesse sentido, vários estudos têm sido descritos quanto à imobilização de HPAs em vários suportes. Entre estes se podem citar esterificação do ácido mandélico, 12 imobilização em sílica e zircônia e uso na esterificação do ácido acético com butanol, 13 imobilização em alumina neutra e uso na esterificação do ácido fórmico, acético e propiônico, 14 imobilização em zircônia hidratada e uso na obtenção de biodiesel. 15 Outros trabalhos ainda relatam diversas formas de impregnações/ imobilizações de diversos HPAs em vários suportes e uso em reações variadas.…”

Section: Introductionunclassified

Impregnação do ácido 12-fosfotúngstico em sílica - parte I: determinação de parâmetros de impregnação, caracterização e avaliação da atividade catalítica

et al. 2012

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“…They also found application in medicinal, cosmetic, and agrochemical industry [17,18]. Enantioselective analytics of mandelic acid and their derivatives by HPLC is not very frequently reported [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Unexpected enantioseparation of mandelic acids and their derivatives on 1,2,3‐triazolo‐linked quinine tert‐butyl carbamate anion exchange‐type chiral stationary phase

Kacprzak

Maier

Lindner

2010

J of Separation Science

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Replacement of the flexible thioether linker for the novel, rigid 1,2,3-triazole spacer group in the course of immobilization of quinine tert-butyl carbamate onto a silica surface led to a chiral stationary phase (CSP) with enhanced enantioselectivity for the resolution of mandelic acid and derivatives thereof. These new CSPs allowed efficient resolution of a wide set of mandelic acids with α-values between 1.08 and 1.68. The high loadability of these chiral ion exchange type CSPs allows preparative separation in the milligram range on an analytical column of 100×4 mm id in a single run as it was demonstrated for 4-trifluoromethylmandelic, 2-naphthylglycolic and 3,4-methylenedioxymandelic acids. The chiral recognition process has been studied using a library of 25 diverse racemic probes. A tentative model suggests that the rigid 1,2,3-triazole group takes part in the formation of an enantioselective-binding pocket of the entire and immobilized selector moiety of the CSP. The primary interaction site is given by the ionizable quinuclidine group of the Cinchona alkaloid supported by possible π-π stabilization effects within the selector-selectand complex.

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Esterification of mandelic acid catalyzed by heteropoly acid

Cited by 26 publications

References 27 publications

Microwave Assisted Transesterification of Maize (Zea Mays L.) Oil as a Biodiesel Fuel

Microwave Assisted Transesterification of Maize (Zea Mays L.) Oil as a Biodiesel Fuel

Impregnação do ácido 12-fosfotúngstico em sílica - parte I: determinação de parâmetros de impregnação, caracterização e avaliação da atividade catalítica

Unexpected enantioseparation of mandelic acids and their derivatives on 1,2,3‐triazolo‐linked quinine tert‐butyl carbamate anion exchange‐type chiral stationary phase

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