Kinetics of ethylic esterification of lauric acid on acid activated montmorillonite (STx1-b) as catalyst

Santos, Paulo Ricardo Schizaki dos; Voll, Fernando Augusto Pedersen; Hamerski, Fabiane; Corazza, Marcos L.

doi:10.1016/j.fuel.2016.05.026

Cited by 16 publications

(9 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 55%

“…XRD and FTIR analyses, as well as information regarding the acidic sites and textural properties. The material was not analyzed after the reactions performed in this work, since acid activated clay minerals tend to be stable compounds that can be reused for several reaction cycles (Santos et al, 2016;Zatta et al, 2013;Zatta et al, 2012a).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Montmorillonite K10 was selected as catalyst for esterification reactions, since activated clay minerals, in general, can be very interesting catalysts for esterification reactions, as reported by several authors (Kanda et al, 2017;Neji et al, 2011;Neji et al, 2009;Pires et al, 2013;Rezende et al, 2012;Santos et al, 2016;Zatta et al, 2012a;Zatta et al, 2012b;Zatta et al, 2011). Furthermore, reports in the literature about the use of this catalyst for the processing of highacidity oils are scarce.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Ffa Content Analysissupporting

confidence: 55%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The heterogeneous reaction mechanism experimentally performed can be modeled by the E–R model, which is the reaction on the basis of the assumption that one of the adsorbed reactants is reacting with another in the bulk fluid . In this work, it was assumed the reaction between adsorbed ethyl alcohol on acid sites of the catalyst and acrylic acid in the bulk solution, as proposed by Santos et al . However, ethyl acrylate molecules adsorbed were neglected and adsorption of water by resin has an inhibiting effect on the reaction mechanism .…”

Section: Resultsmentioning

confidence: 99%

“…The reaction mechanism can be given as following steps :

\begin{matrix} true \\ right EOH + normalS \leftrightarrow EOH \cdot normalS adsorption of ethanol \end{matrix}

\begin{matrix} true \\ right EOH \cdot normalS + AA \leftrightarrow EA \cdot normalS + normalW surface reaction \end{matrix}

\begin{matrix} true \\ right EA \cdot normalS \leftrightarrow EA + normalS desorption of ester \end{matrix}

\begin{matrix} true \\ right normalW + normalS \leftrightarrow normalW \cdot normalS adsorption / desorption of water \end{matrix}

where S represents solid site of catalyst. Depending on this mechanism, the reaction rate expression can be given by

\begin{matrix} true \\ right - r_{i} = - \frac{d C_{i}}{d t} = \frac{k_{1} ((), m / V) ((), C_{AA} C_{EOH} - ((), C_{EA} C_{W} / K_{e}))}{1 + K_{EOH} C_{EOH} + K_{W} C_{W}} \end{matrix}

where k 1 is the forward reaction rate constant, m is the quantity of dry resin, V the volume of the reaction mixture, K e the equilibrium constant of the reaction, K EOH and K W the adsorption equilibrium constants.…”

Section: Resultsmentioning

confidence: 99%

Homogeneous and Heterogeneous Catalyzed Esterification of Acrylic Acid with Ethanol: Reaction Kinetics and Modeling

Jyoti

Keshav

Anandkumar

et al. 2018

Int J of Chemical Kinetics

View full text Add to dashboard Cite

Kinetics of esterification of acrylic acid with ethanol in the presence of homogeneous (H2SO4, HCl, p‐TSA, HI) catalysts as well as heterogeneous catalysts (Dowex 50WX, Amberlyst 15) was studied. The effects and performance of these catalysts on the conversion of acrylic acid were evaluated. In the kinetics of homogeneous catalyzed reaction, both concentration and activity‐based model were employed. Activity coefficients were predicted by the Universal Functional group Contribution (UNIFAC) method to consider nonideal behavior of the liquid phase. The heterogeneous catalyzed reaction mechanisms were developed using Eley–Rideal theory. The model results were compared with the experimental results and were in good agreement. The temperature dependency of the constants, reaction enthalpy, and entropy, and activation energy were determined. The conversion of acrylic acid was obtained as 63.2%, 61.02%, 53.3%, 21.4%, 34.96%, and 14.84% for H2SO4, p‐TSA, HCl, HI, Dowex 50WX, and Amberlyst 15, respectively, under process temperature of 70°C, reactant molar ratio of 1:1, and catalyst concentration of 2% (v/v) for homogeneous and 2.17 g for heterogeneous catalyst. These outcomes provide an approach to understand the significant effect of each catalyst on the esterification kinetics of acrylic acid and ethanol.

show abstract

Reactions of Carboxylic Acids With an Alcohol Over Acid Materials

Castanheiro

2021

Biodiesel Technology and Applications

View full text Add to dashboard Cite

Kinetics of ethylic esterification of lauric acid on acid activated montmorillonite (STx1-b) as catalyst

Cited by 16 publications

References 52 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

Homogeneous and Heterogeneous Catalyzed Esterification of Acrylic Acid with Ethanol: Reaction Kinetics and Modeling

Reactions of Carboxylic Acids With an Alcohol Over Acid Materials

Contact Info

Product

Resources

About