Optimization of process variables for esterification of bio-oil model compounds by a heteropolyacid catalyst

Prasertpong, Prapaporn; Jaroenkhasemmeesuk, Chawannat; Regalbuto, John R.; Lipp, Jeremiah; Tippayawong, Nakorn

doi:10.1016/j.egyr.2019.11.026

Cited by 19 publications

(7 citation statements)

References 37 publications

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“…According to these results (Table 6), the correlation between the variables is consistent (p‐value <0.0000 and an F‐value of 27.891). Catalyst loading and temperature were identified as the more important variables (p‐value <0.0002), in agreement with the literature for related reactions [57–61] …”

Section: Resultssupporting

confidence: 87%

“…Catalyst loading and temperature were identified as the more important variables (p-value < 0.0002), in agreement with the literature for related reactions. [57][58][59][60][61] [a] 97 21 6…”

Section: Relevance Of Individual Operational Conditionsmentioning

confidence: 99%

“…The reagents were mixed by magnetic stirring, and the reaction was stopped after 240 minutes. During kinetic studies, samples (< 3 mL each) were withdrawn after set reaction times (15,30,45,60,120,180, and 240 minutes). The samples were filtered by syringe, rota-evaporated at 40 °C to remove the liquid phase (170 mbar for 15 minutes, 72 mbar for 30 minutes, and 30 mbar for 30 minutes), and the conversion was determined by 1 H-NMR spectroscopy based on the integration of baseline separated signals.…”

Section: Photocatalytic Esterification Of Oleic Acid With Methanolmentioning

confidence: 99%

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Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

et al. 2022

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Methyl oleate, an example of a FAME (fatty acid methyl ester), was produced by oleic acid (OA) photoesterification with TiO2 and UVA light. Different parameters were evaluated and optimised: catalyst pretreatment, temperature (25–65 °C), catalyst loading (1–30 % w/wOA) and oleic acid : alcohol molar ratio (1 : 3–1 : 55). Response surface quadratic methodology obtained by central composite rotational design (RSM‐CCRD) was used to evaluate the main operational conditions of the photoesterification process. A high conversion of 98 % (±0.8) at 55 °C, 20 % TiO2 (w/wOA), and 1(OA) : 55(methanol) molar ratio was achieved. The photoesterification mechanism is furthermore proposed. The Langmuir‐Hinshelwood kinetic model considered the forward and backward reaction as first‐order fits with the best accuracy (R2 of 0.997). The thermodynamic results (ΔG338.15K=−20.75 kJ/mol, ΔH=13.75 kJ/mol, and ΔS=0.47 kJ/mol.K) indicate that the operating conditions are important, both to supply the energy requirement of the reaction, but also to increase the miscibility of the reactants.

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Section: Resultssupporting

confidence: 87%

Section: Relevance Of Individual Operational Conditionsmentioning

confidence: 99%

Section: Photocatalytic Esterification Of Oleic Acid With Methanolmentioning

confidence: 99%

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Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

et al. 2022

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“…During the reaction, an increase in pressure decreased the rate of conversion, due to an increase the viscosity of the reaction mixture, thus restricting molecular mobility, both of which inhibit mass transfer. 87,88 Table 3 presents the results of reacting DL-alanine, DLphenylalanine, DL-leucine, and DL-methionine with HClO 4 in stoichiometric amounts of 20, 40, and 80 equiv. of DMC in a high-pressure reactor.…”

Section: Paper Green Chemistrymentioning

confidence: 99%

A novel approach to amino acid synthesis: acid-assisted reactions with dimethyl carbonate for efficient O-methylated, N,O-methylated and N-formylated derivatives

Worsawat,

Noppawan,

Supanchaiyamat

et al. 2024

Green Chem.

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“…Esterifikasi senyawa model sebagai representasi bio-oil menggunakan etanol terkatalisis asam 12-tungstosilikat memberikan konversi asam hampir mencapai 90% pada temperatur 77 °C, rasio molar etanol terhadap asam sebesar 5:1, jumlah katalis 4% b/b selama 8,3 jam (Prasertpong et al, 2020). Bio-oil setelah esterifikasi menunjukkan peningkatan karakteristik bio-oil sebagai bahan bakar yang ditunjukkan oleh peningkatan nilai kalor dari 17,6 MJ/kg menjadi 23,2 MJ/kg (Prasertpong et al, 2020).…”

Section: Katalis Dalam Proses Esterifikasi Bio-oilunclassified

Zeolit Alam Indonesia Sebagai Kandidat Katalis Asam Padat Yang Unggul Untuk Proses Upgrading Bio-Oil Melalui Teknik Esterifikasi

Kadarwati¹,

Annisa²,

Apriliani³

2022

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Isu lingkungan dan ketersedian bahan bakar berbasis fosil yang semakin menipis mendorong upaya-upaya eksplorasi sumbersumber energi baru terbarukan yang bersifat lebih ramah lingkungan. Biomassa sebagai salah satu sumber energi terbarukan sangat potensial untuk dieksplorasi dan dikonversi menjadi bahan bakar cair melalui proses pirolisis menjadi bio-oil. Namun sayangnya, bio-oil tidak dapat langsung digunakan sebagai bahan bakar mesin berteknologi tinggi, seperti mesin kendaraan bermotor, diantaranya karena keasamannya yang tinggi, bersifat tidak stabil dan nilai kalor yang rendah. Upaya peningkatan kualitas bio-oil terus diteliti dan dikembangkan. Beberapa proses upgrading bio-oil seperti pembentukan emulsi dan penambahan pelarut, hydrocracking, hydrotreatment, steam reforming, dan reaksi dalam supercritical fluids telah diteliti dan dikembangkan. Esterifikasi merupakan salah satu teknik upgrading bio-oil yang sederhana, murah dan cukup efektif untuk meningkatkan kualitas bio-oil. Pada bab ini, upgrading bio-oil melalui teknik esterifikasi katalitik didiskusikan secara rinci. Beberapa katalis baik homogen maupun heterogen yang digunakan dalam proses esterifikasi biooil baik bio-oil riil maupun senyawa-senyawa model juga dijelaskan. Selain itu, penggunaan katalis berbasis zeolit yang terfokus pada zeolit alam Indonesia dikaji potensi dan keunggulannya secara mendalam.

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Optimization of process variables for esterification of bio-oil model compounds by a heteropolyacid catalyst

Cited by 19 publications

References 37 publications

Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

A novel approach to amino acid synthesis: acid-assisted reactions with dimethyl carbonate for efficient O-methylated, N,O-methylated and N-formylated derivatives

Zeolit Alam Indonesia Sebagai Kandidat Katalis Asam Padat Yang Unggul Untuk Proses Upgrading Bio-Oil Melalui Teknik Esterifikasi

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Optimization of process variables for esterification of bio-oil model compounds by a heteropolyacid catalyst

Cited by 19 publications

References 37 publications

Methyl Oleate Synthesis by TiO2 Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Methyl Oleate Synthesis by TiO2 Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

A novel approach to amino acid synthesis: acid-assisted reactions with dimethyl carbonate for efficient O-methylated, N,O-methylated and N-formylated derivatives

Zeolit Alam Indonesia Sebagai Kandidat Katalis Asam Padat Yang Unggul Untuk Proses Upgrading Bio-Oil Melalui Teknik Esterifikasi

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Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics