Ethanolysis of selected carbohydrates catalyzed by functionalized acidic ionic liquids: An unexpected effect of structural functionalization on selectivity phenomena

2022 ◽  
Author(s):  
Janusz Nowicki ◽  
Ewa Nowakowska-Bogdan
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Sulfate ◽  
Unexpected Effect ◽  
Acidic Ionic Liquids

A series of functionalized hydrogen sulfate imidazolium ILs were synthesized and applied as catalysts in the reaction of glucose, xylose and fructose with ethanol. In research, the unexpected selectivity phenomena...

Synthesis, Characterization of Novel Hexamethyleneiminium-Based Ionic Liquids and their Application in Esterification

2011 ◽  
Vol 233-235 ◽  
pp. 155-159
Author(s):  
Gong Li ◽  
Fei Ke Wu ◽  
Hui Juan Tong
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Citric Acid ◽  
Hydrogen Sulfate ◽  
Catalytic Activities ◽  
H Nmr ◽  
Acidic Ionic Liquids ◽  
Ft Ir

Three novel Brønsted acidic ionic liquids (ILs), 1-(3-sulfopropyl) hexamethyleneiminium hydrogen sulfate ([HMIPS]HSO4), 1-(3-sulfopropyl) hexamethyleneiminium tosilate ([HMIPS]OTs) and 1-hexamethyleneiminium hydrogen sulfate([HMI]HSO4), were synthesized and characterized by1H NMR, FT-IR and DSC-TG. Their catalytic activities for the esterification of citric acid with n-butanol were examined and compared with the imidazolium-based ILs. The results showed that the hexamethyleneiminium-based ILs exhibits excellent catalytic activity. By using [HMIPS]HSO4as the catalyst, the yield of tributyl citrate reached 97.5%. Furthermore, the catalysts were reused at least 10 times without significant decrease in activity

Efficient cyclodehydration of diethylene glycol in Brønsted acidic ionic liquids

2008 ◽  
Vol 62 (3) ◽  
Author(s):  
Yuan-Yuan Wang ◽  
Wei Li ◽  
Li-Yi Dai
Keyword(s):  
Ionic Liquids ◽  
Diethylene Glycol ◽  
Molar Ratio ◽  
Temperature Reaction ◽  
Hydrogen Sulfate ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Catalytic Activities ◽  
Acidic Ionic Liquids ◽  
First Time

AbstractCyclodehydration of diethylene glycol using various Brønsted acidic ionic liquids as dual solvent-catalysts has been studied for the first time. Better results were obtained in the presence of 1-butyl-3-methylimidazolium hydrogen sulfate ([PSmim]HSO4) compared with other Brønsted acidic ionic liquids. Effects of the reaction conditions such as reaction temperature, reaction time and molar ratio of ionic liquid to diethylene glycol have been investigated. High diethylene glycol conversion, 97.0 %, and high 1,4-dioxane selectivity, 89.3 %, were obtained in [PSmim]HSO4 under optimum conditions. Hammett method was used to determine the acidity order of these ionic liquids and the results were consistent with the catalytic activities observed in the cyclodehydration reaction. Utilization of Brønsted acidic ionic liquids as dual solvent-catalysts has some advantages, e.g. high conversion of DEG, easy preparation and reuse of ionic liquids, avoiding toxic catalysts and solvents.

N,N,N′,N′-Tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate and pyridinium-N-sulfonic acid hydrogen sulfate as highly effective dual-functional catalysts for the preparation of N,N′-alkylidene bisamides

2019 ◽  
Vol 74 (9) ◽  
pp. 641-647 ◽  
Author(s):  
Zahra Kordrostami ◽  
Abdolkarim Zare ◽  
Mostafa Karami
Keyword(s):  
Ionic Liquids ◽  
Sulfonic Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Disulfonic Acid ◽  
Hydrogen Sulfate ◽  
Reaction Conditions ◽  
Dual Functional ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids

AbstractIn this research, Brønsted-acidic ionic liquids N,N,N′,N′-tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate ([TMEDSA][TFA]2) and pyridinium-N-sulfonic acid hydrogen sulfate ([Py-SO3H][HSO4]) have been introduced as dual-functional catalysts for the green, simple and effective preparation of N,N′-alkylidene bisamides by the reaction of primary amides (2 eq.) with arylaldehydes (1 eq.) under solvent-free conditions. The reaction results and conditions of the catalysts have been compared with the previously reported ones. [TMEDSA][TFA]2 and [Py-SO3H][HSO4] were superior to the previously reported catalysts in terms of two or more of these factors: reaction times (10–45 min), yields (86–98%), temperature and the reaction conditions. Additionally, a plausible and attractive mechanism based on dual functionality of the catalysts has been proposed.

Acidic Ionic Liquids Enabling Intermediate Temperature Operation Fuel Cells

2021 ◽  
Vol 13 (7) ◽  
pp. 8370-8382
Author(s):  
Hui Hou ◽  
Hanno Maria Schütz ◽  
Jürgen Giffin ◽  
Klaus Wippermann ◽  
Xinpei Gao ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Fuel Cells ◽  
Intermediate Temperature ◽  
Acidic Ionic Liquids

Brønsted Acidic Ionic Liquids as Efficient Catalysts for the Synthesis of Amidoalkyl Naphthols

2010 ◽  
Vol 41 (2) ◽  
pp. 298-306 ◽  
Author(s):  
M. M. Heravi ◽  
N. Tavakoli-Hoseini ◽  
F. F. Bamoharram
Keyword(s):  
Ionic Liquids ◽  
Amidoalkyl Naphthols ◽  
Acidic Ionic Liquids

scholarly journals Biodiesel (methyl oleate) synthesis in the presence of pyridinium and aminotriazolium acidic ionic liquids: Kinetic, thermodynamic studies

Fuel ◽  
2022 ◽  
Vol 307 ◽  
pp. 121876
Author(s):  
Ivaylo Tankov ◽  
Zilya Mustafa ◽  
Radoslava Nikolova ◽  
Anife Veli ◽  
Rumyana Yankova
Keyword(s):  
Ionic Liquids ◽  
Methyl Oleate ◽  
Thermodynamic Studies ◽  
Acidic Ionic Liquids

Synthesis of dioxanes via Prins reaction catalyzed by acyclic acidic ionic liquids

2010 ◽  
Vol 16 (2) ◽  
pp. 233-237 ◽  
Author(s):  
Dong Fang ◽  
Chang-mei Jiao ◽  
Hua-bin Zhang ◽  
Bao-hua Ji
Keyword(s):  
Ionic Liquids ◽  
Prins Reaction ◽  
Acidic Ionic Liquids
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