Conversion of concentrated sugar solutions into 5-hydroxymethyl furfural and furfural using Brönsted acidic ionic liquids

2015 ◽  
Vol 5 (12) ◽  
pp. 5086-5090 ◽  
Author(s):  
B. M. Matsagar ◽  
M. K. Munshi ◽  
A. A. Kelkar ◽  
P. L. Dhepe
Keyword(s):  
Ionic Liquids ◽  
Hydroxymethyl Furfural ◽  
Acidic Ionic Liquids ◽  
Renewable Sugars ◽  
High Yields

Using recyclable and green ionic liquids in catalytic amounts, renewable sugars are dehydrated into furans with high yields.

scholarly journals Functional acidic ionic liquids as effective solvents for the fractionation of lignocelluloses

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 4721-4732
Author(s):  
Shi Jia Dong ◽  
Bi Xian Zhang ◽  
Peng Zhang ◽  
Kun Yang Wu ◽  
Xin Miao He ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Lignin Degradation ◽  
Degradation Products ◽  
Reducing Sugar ◽  
Alkaline Extraction ◽  
Enzymatic Conversion ◽  
Acidic Ionic Liquids ◽  
Lignin Degradation Products ◽  
High Yields ◽  
Hydrolysis Of

There is increasing interest in the application of ionic liquids for the pretreatment and fractionation of lignocelluloses. In this study, a series of functional acidic ionic liquids (ILs) with various heterocyclic organic cations were synthesized. Corn stalks were successfully fractionated into lignin, hemicelluloses, and cellulose when ultrasonically pretreated with ILs at 70 °C for 3 h, and subsequently treated with alkaline extraction. High yields of IL-isolated lignin (18.3% to 19.6%) and (8.3% to 14.6%) were obtained using ILs in the absence and presence of water, respectively. The yield of cellulose ranged from 40.0 to 77.0% from IL treatments, whereas the yield of hemicelluloses ranged from 1.1% to 17.3%. Enzymatic hydrolysis of the isolated cellulose residual produced 89.2% to 94.9% reducing sugar with 77.8% to 86.1% glucose, which corresponded to 80.5% to 91.4% enzymatic conversion of cellulose. Syringol and vanillin were found as the main lignin degradation products.

Synthesis of Symmetric Ethers Using Monocationic and Dicationic Acidic Ionic Liquids

2018 ◽  
Vol 762 ◽  
pp. 104-108
Author(s):  
Ance Eglīte ◽  
Linda Pudnika ◽  
Marta Anda Balode ◽  
Anda Prikšāne
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Alkylating Agents ◽  
Dehydration Reaction ◽  
Reaction Conditions ◽  
Acidic Ionic Liquids ◽  
Dicationic Ionic Liquids ◽  
High Yields ◽  
Long Chain

A series of monocationic and dicationic -SO3H functionalized Brønsted acidic ionic liquids (BAILs) are synthesized using different amines int.al., N,N,N′,N′-tetramethylethylenediamine, 1-methylimidazole, pyridine and alkylating agents 1,3-propane- and 1,4-butanesultones. The Hammett acidity (H0) and thermal properties by TG-DSC techniques are investigated. These ionic liquids have been applied to catalyze the dehydration reaction of aliphatic long chain alcohols (1-heptanol, 1-octanol, 1-decanol) at 195 °C. The optimization of reaction conditions and use of dicationic ionic liquids allow to reach rather high yields of symmetric diheptyl ether and dioctyl ether. The reusability of ionic liquids is evaluated using monocationic [PyPS][HSO4], dicationic [TMEDAPS][HSO4] ionic liquids and 1-heptanol.

Novel Brønsted Acidic Ionic Liquids Based on Benzimidazolium Cation: Synthesis and Catalyzed Conjugate Addition of Indoles with α,β-unsaturated Ketones

2011 ◽  
Vol 233-235 ◽  
pp. 977-984
Author(s):  
Bin Wang ◽  
Chen Jiang Liu
Keyword(s):  
Ionic Liquids ◽  
Michael Addition ◽  
Addition Reaction ◽  
Conjugate Addition ◽  
Michael Addition Reaction ◽  
Unsaturated Ketones ◽  
Mild Conditions ◽  
Acidic Ionic Liquids ◽  
High Yields ◽  
The Michael Addition

Brønsted acidic ionic liquids based on benzimidazolium cation was synthesized and employed as an efficient catalysts for the Michael addition reaction of indoles to α,β-unsaturated ketones under mild conditions to afford the corresponding conjugate addition products in high yields (90%-98%). The catalyst 1-butyl-3-(3-sulfopropyl)benzimidazolium p-toluenesulfonate ([PSbbim][p-CH3PhSO3]) could be reused at least three times without a noticeably decrease in its activity.

Catalytic conversion of cellulose to 5-hydroxymethyl furfural using acidic ionic liquids and co-catalyst

2012 ◽  
Vol 90 (2) ◽  
pp. 792-798 ◽  
Author(s):  
Zhen-Dong Ding ◽  
Jin-Cai Shi ◽  
Jing-Jing Xiao ◽  
Wen-Xiu Gu ◽  
Chang-Ge Zheng ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Catalytic Conversion ◽  
Co Catalyst ◽  
Hydroxymethyl Furfural ◽  
Acidic Ionic Liquids

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 Cover Picture: Metal-Free Dehydration of Glucose to 5-(Hydroxymethyl)furfural in Ionic Liquids with Boric Acid as a Promoter (Chem. Eur. J. 5/2011)

2011 ◽  
Vol 17 (5) ◽  
pp. 1369-1369 ◽  
Author(s):  
Tim Ståhlberg ◽  
Sergio Rodriguez-Rodriguez ◽  
Peter Fristrup ◽  
Anders Riisager
Keyword(s):  
Ionic Liquids ◽  
Boric Acid ◽  
Metal Free ◽  
Hydroxymethyl Furfural
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