Absence of expected side-reactions in the dehydration reaction of fructose to HMF in water over niobic acid catalyst

2011 ◽  
Vol 12 (12) ◽  
pp. 1122-1126 ◽  
Author(s):  
Paolo Carniti ◽  
Antonella Gervasini ◽  
Matteo Marzo
Keyword(s):  
Acid Catalyst ◽  
Side Reactions ◽  
Dehydration Reaction ◽  
Niobic Acid

scholarly journals Study of Soybean Oil Hydrolysis Catalyzed by Thermomyces lanuginosus Lipase and Its Application to Biodiesel Production via Hydroesterification

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Elisa d'Avila Cavalcanti-Oliveira ◽  
Priscila Rufino da Silva ◽  
Alessandra Peçanha Ramos ◽  
Donato Alexandre Gomes Aranda ◽  
Denise Maria Guimarães Freire
Keyword(s):  
Soybean Oil ◽  
Methyl Esters ◽  
Reaction Medium ◽  
Acid Catalyst ◽  
Biodiesel Production ◽  
Thermomyces Lanuginosus ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Thermomyces Lanuginosus Lipase ◽  
Niobic Acid

The process of biodiesel production by the hydroesterification route that is proposed here involves a first step consisting of triacylglyceride hydrolysis catalyzed by lipase from Thermomyces lanuginosus (TL 100L) to generate free fatty acids (FFAs). This step is followed by esterification of the FFAs with alcohol, catalyzed by niobic acid in pellets or without a catalyst. The best result for the enzyme-catalyzed hydrolysis was obtained under reaction conditions of 50% (v/v) soybean oil and 2.3% (v/v) lipase (25 U/mL of reaction medium) in distilled water and at 60∘C; an 89% conversion rate to FFAs was obtained after 48 hours of reaction. For the esterification reaction, the best result was with an FFA/methanol molar ratio of 1:3, niobic acid catalyst at a concentration of 20% (w/w FFA), and 200∘C, which yielded 92% conversion of FFAs to soy methyl esters after 1 hour of reaction. This study is exceptional because both the hydrolysis and the esterification use a simple reaction medium with high substrate concentrations.

ChemInform Abstract: Esterification of Acrylic Acid with Methanol over Niobic Acid Catalyst.

ChemInform ◽  
1987 ◽  
Vol 18 (22) ◽  
Author(s):  
T. IIZUKA ◽  
S. FUJIE ◽  
T. USHIKUBO ◽  
Z. CHEN ◽  
K. TANABE
Keyword(s):  
Acrylic Acid ◽  
Acid Catalyst ◽  
Niobic Acid

scholarly journals Direct conversion of glucose to 5-hydroxymethylfurfural using a mixture of niobic acid and niobium phosphate as a solid acid catalyst

Fuel ◽  
2017 ◽  
Vol 210 ◽  
pp. 67-74 ◽  
Author(s):  
Mariana N. Catrinck ◽  
Emerson S. Ribeiro ◽  
Robson S. Monteiro ◽  
Rogério M. Ribas ◽  
Márcio H.P. Barbosa ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Direct Conversion ◽  
Niobic Acid ◽  
Niobium Phosphate

Esterification of acrylic acid with methanol over niobic acid catalyst

1986 ◽  
Vol 28 ◽  
pp. 1-5 ◽  
Author(s):  
Tokio Iizuka ◽  
Shinobu Fujie ◽  
Takashi Ushikubo ◽  
Zai-hu Chen ◽  
Kozo Tanabe
Keyword(s):  
Acrylic Acid ◽  
Acid Catalyst ◽  
Niobic Acid

Facile cyclization in the synthesis of highly fused diaza cyclooctanoid compounds using retrievable nano magnetite-supported sulfonic acid catalyst

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23779-23789 ◽  
Author(s):  
Sudipta Pathak ◽  
Kamalesh Debnath ◽  
Md. Masud Rahaman Mollick ◽  
Animesh Pramanik
Keyword(s):  
Sulfonic Acid ◽  
Acid Catalyst ◽  
Nano Particles ◽  
Dehydration Reaction ◽  
Efficient Catalyst ◽  
Magnetically Separable

Magnetically separable Fe3O4–SO3H nano particles have been prepared and established as an efficient catalyst for the synthesis of dihydrofuran fused cyclooctanoids via the dehydration reaction of dihydroxy cyclooctanoid heterocylces.

scholarly journals Conversion of Glucose to 5-Hydroxymethylfurfural, Levulinic Acid, and Formic Acid in 1,3-Dibutyl-2-(2-butoxyphenyl)-4,5-diphenylimidazolium Iodide-Based Ionic Liquid

2021 ◽  
Vol 11 (3) ◽  
pp. 989
Author(s):  
Megawati Zunita ◽  
Deana Wahyuningrum ◽  
Buchari ◽  
Bunbun Bundjali ◽  
I Gede Wenten ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Formic Acid ◽  
Levulinic Acid ◽  
High Performance ◽  
Acid Catalyst ◽  
Separation Process ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Dehydration Reaction ◽  
Brönsted Acid

The separation process between 5-hydroxymethylfurfural (HMF) and trace glucose in glucose conversion is important in the biphasic system (aqueous–organic phase), due to the partial solubility property of HMF in water. In addition, the yield of HMF via the dehydration reaction of glucose in water is low (under 50%) with the use of Brønsted acid as a catalyst. Therefore, this study was conducted to optimize the production and separation of products by using a new hydrophobic ionic liquid (IL), which is more selective than water. The new IL (1,3-dibutyl-2-(2-butoxyphenyl)-4,5-diphenyl imidazolium iodide) [DBDIm]I was used as a solvent and was optimized for the dehydration reaction of glucose to make a more selective separation of HMF, levulinic acid (LA), and formic acid (FA). [DBDIm]I showed high performance as a solvent for glucose conversion at 100 °C for 120 min, with a yield of 82.2% HMF, 14.9% LA, and 2.9% FA in the presence of sulfuric acid as the Brønsted acid catalyst.

scholarly journals On the Spatial Design of Co-Fed Amines for Selective Dehydration of Methyl Lactate to Acrylates

2021 ◽  
Author(s):  
Yutong Pang ◽  
M. Alexander Ardagh ◽  
Manish Shetty ◽  
Anargyros Chatzidmitriou ◽  
Gaurav Kumar ◽  
...  
Keyword(s):  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Side Reaction ◽  
Acid Sites ◽  
Side Reactions ◽  
Proton Affinities ◽  
Nay Zeolite ◽  
Methyl Lactate ◽  
Diffusion Limitations ◽  
Spatial Design

Co-feeding an inert and site-selective chemical titrant provides desirable selectivity tuning when titrant adsorption is favored over side reaction pathways on a solid acid catalyst. Here, a selectivity enhancement from 61 to 84 C % was demonstrated for methyl lactate dehydration to methyl acrylate and acrylic acid over NaY zeolite catalyst using amines as the co-fed titrants to suppress side reactions on in situ generated Brønsted acid sites (BAS). The effectiveness of BAS titration was evaluated by considering both the basicity and steric properties of the titrant molecule with the goal to maximize the selectivity enhancement. The presence of electron-donating alkyl functional groups enhances amine basicity but also introduces additional steric constraints to the molecule with respect to the pore dimensions of the NaY zeolite. While higher basicity of titrant amines favors stronger adsorption on BAS, steric limitations hinder site binding through contributions from internal diffusion limitations and local steric repulsion between titrant and the zeolite wall around the BAS. Titrant bases with proton affinities above ~1040 kJ/mol and sizes below 85% of the NaY supercage window or pore diameter are predicted to afford dehydration selectivities above 90 C % to acrylate products.

Solvent effects in liquid-phase dehydration reaction of ethanol to diethylether catalysed by sulfonic-acid catalyst

2011 ◽  
Vol 394 (1-2) ◽  
pp. 276-280 ◽  
Author(s):  
Laurent Vanoye ◽  
Marie-Line Zanota ◽  
Audrey Desgranges ◽  
Alain Favre-Reguillon ◽  
Claude De Bellefon
Keyword(s):  
Liquid Phase ◽  
Solvent Effects ◽  
Sulfonic Acid ◽  
Acid Catalyst ◽  
Dehydration Reaction

Catalytic Conversion of Microcrystalline Cellulose to Glucose and 5-Hydroxymethylfurfural over a Niobic Acid Catalyst

2019 ◽  
Vol 58 (38) ◽  
pp. 17675-17681 ◽  
Author(s):  
Zhe Wen ◽  
Linhao Yu ◽  
Fuhang Mai ◽  
Zewei Ma ◽  
Hong Chen ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Acid Catalyst ◽  
Catalytic Conversion ◽  
Niobic Acid

Esterification of Jatropha curcas hydrolysate using powdered niobic acid catalyst

2016 ◽  
Vol 63 ◽  
pp. 243-249 ◽  
Author(s):  
Nurudeen Ishola Mohammed ◽  
Nassereldeen Ahmed Kabbashi ◽  
Md Zahangir Alam ◽  
Mohamed Elwathig S. Mirghani
Keyword(s):  
Jatropha Curcas ◽  
Acid Catalyst ◽  
Niobic Acid
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