Coupling metal halides with a co-solvent to produce furfural and 5-HMF at high yields directly from lignocellulosic biomass as an integrated biofuels strategy

2014 ◽  
Vol 16 (8) ◽  
pp. 3819-3829 ◽  
Author(s):  
Charles M. Cai ◽  
Nikhil Nagane ◽  
Rajeev Kumar ◽  
Charles E. Wyman
Keyword(s):  
Lignocellulosic Biomass ◽  
Solvent System ◽  
Metal Halides ◽  
High Yields

A monophasic reaction strategy is proposed that couples metal halides with a highly tunable co-solvent system employing renewable THF to significantly enhance co-production of furfural and 5-HMF from biomass.

Direct conversion of cellulose to high-yield methyl lactate over Ga-doped Zn/H-nanozeolite Y catalysts in supercritical methanol

2017 ◽  
Vol 19 (8) ◽  
pp. 1969-1982 ◽  
Author(s):  
Deepak Verma ◽  
Rizki Insyani ◽  
Young-Woong Suh ◽  
Seung Min Kim ◽  
Seok Ki Kim ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Value Added ◽  
Direct Conversion ◽  
High Yield ◽  
Supercritical Methanol ◽  
Methyl Lactate ◽  
High Yields

For realizing sustainable bio-based refineries, it is crucial to obtain high yields of value-added chemicalsviadirect conversion of cellulose and lignocellulosic biomass.

An engineered solvent system for sugar production from lignocellulosic biomass using biomass derived γ-valerolactone

2016 ◽  
Vol 18 (21) ◽  
pp. 5756-5763 ◽  
Author(s):  
Ali Hussain Motagamwala ◽  
Wangyun Won ◽  
Christos T. Maravelias ◽  
James A. Dumesic
Keyword(s):  
Lignocellulosic Biomass ◽  
Solvent System ◽  
Efficient Production ◽  
Sugar Production

We demonstrate the design of a solvent system for efficient production and enhanced separation of carbohydrates from lignocellulosic biomass.

scholarly journals Mesoscale Assembly of Bisteroidal Esters from Terephthalic Acid

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1213 ◽  
Author(s):  
Gabriel Guerrero-Luna ◽  
María Guadalupe Hernández-Linares ◽  
Sylvain Bernès ◽  
Alan Carrasco-Carballo ◽  
Diana Montalvo-Guerrero ◽  
...  
Keyword(s):  
Self Assembly ◽  
Terephthalic Acid ◽  
Van Der Waals ◽  
Solvent System ◽  
Van Der Waals Interactions ◽  
Show Evidence ◽  
Non Covalent Interactions ◽  
Solvent Systems ◽  
High Yields ◽  
Covalent Interactions

A new series of bisteroidal esters was synthesized using a spacer group, sterols and sapogenins as substrates. Steroidal dimers were prepared in high yields employing diesters of terephthalic acid as linkages at the 3β, 3′β steroidal positions. In all attempts to crystallize bisteroids, it was observed that the compounds tended to self-organize in solution, which was detected when employing various solvent systems. The non-covalent interactions (van der Waals) of the steroidal moieties of this series of symmetrical bisteroids, the polarity of the solvents systems, and the different solubilities of the bisteroid aggregates, indeed induce the molecules to self-assemble into supramolecular structures with well-defined organization. Our results show that the self-assembled structures for the bisteroidal derivatives depend on the solvent system used: with hexane/EtOAc, membrane-shaped structures were obtained, while pure EtOAc afforded strand-shaped arrangements. In the CHCl3/CH3OH system, thin strands were formed, since van der Waals interactions are lowered in this system, as a consequence of the increased solubility of the bisteroids in CHCl3. Based on the characterization by SEM and XRD, we show evidence that the phenomenon of self-assembly of bisteroids occurs presenting different morphologies depending on the solvent used. The new steroidal dimer derivatives were characterized by NMR, TGA, DSC, SEM, and XRD. Finally, the molecular structure of one bisteroid was confirmed by single-crystal X-ray analysis.

scholarly journals Iodination of Alkylbenzenes using Benzyltriphenylphosphonium Dichromate / I2 System

2009 ◽  
Vol 6 (4) ◽  
pp. 1164-1166 ◽  
Author(s):  
R. Sathiyapriya ◽  
R. Joel Karunakaran
Keyword(s):  
Rapid Method ◽  
Aromatic Compounds ◽  
Solvent System ◽  
Molecular Iodine ◽  
High Yields ◽  
Alkyl Benzenes

An efficient and rapid method have been found using benzyltriphenylphosphonium dichromate (PhCH2PPh3)2Cr2O7as an oxidant along with molecular iodine for the iodination of aromatic compounds. Iodination of a wide variety of alkyl benzenes were done under dichloromethane solvent system and high yields of iodo products were obtained

Efficient synthesis of a novel series of indeno-fused pyrido[2,3-d]pyrimidines using a deep eutectic solvent system comprised of choline chloride/urea

2017 ◽  
Vol 41 (7) ◽  
pp. 430-433
Author(s):  
Mohammad Hakimi Roknabadi ◽  
Mohammad Hossein Mosslemin ◽  
Razieh Mohebat
Keyword(s):  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Environmentally Friendly ◽  
Solvent System ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Three Component Reaction ◽  
High Yields

A series of 13 aryl indeno[2′,1′:5,6]pyrido[2,3- d]pyrimidine-2,4,6-(3 H,5 H,11 H)-triones, eight of which are new, were synthesised regioselectively in high yields by a three-component reaction of 1,3-indanedione, an araldehyde and 6-aminopyrimidin-2,4(1 H,3 H)-dione in the presence of a deep eutectic solvent comprised of choline chloride/urea (1:2) as the catalyst. The reaction conditions were mild and did not require additional catalysts. Given the inexpensive, nontoxic and recyclable nature of the deep eutectic solvent, these reaction conditions are simple to carry out and environmentally friendly.

Soluble and Volatile Precursors for the Preparation of Superconducting Films

1990 ◽  
Vol 180 ◽  
Author(s):  
Nancy N. Sauer ◽  
Eduardo Garcia ◽  
Robert R. Ryan
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Superconducting Films ◽  
Copper Cluster ◽  
Metal Halides ◽  
Barium Copper ◽  
Volatile Precursor ◽  
Solution Route ◽  
High Yields ◽  
Volatile Precursors

ABSTRACTAttempts to identify intermediates in an alkoxide-based solution route to films of the high temperature superconductor YBa2Cu3O7 reported by Fahrenholtz et al.[1] have led to the isolation of the first molecular barium-copper cluster, Ba2Cu2(OR)4(acac)4·2 HOR, R = CH2CH2OCH3. The extension of this route to the preparation of the bismuth superconductors has necessitated the investigation of bismuth alkoxide chemistry. Two separate routes to bismuth alkoxides have been examined: the metathesis of the metal halides with NaOR, (R = t-butyl, and diisopropylphenoxide) and the alcoholysis of bismuth amides, Bi(NR2)3, [R = N(SiMe3)2] The alcoholysis preparation gives high yields of several alkoxides suitable as precursors to the high Tc materials. A monomeric bismuth phenoxide, which is targeted as a volatile precursor, and a bismuth t-butoxide cluster have been isolated and stucturally characterized. Solubility and volatility studies have also been undertaken.

Influence of Enzymatic Cocktails on Conversion of Agricultural Lignocellulose to Fermentable Sugars

2017 ◽  
Vol 68 (2) ◽  
pp. 373-377
Author(s):  
Teodor Vintila ◽  
Vasile Daniel Gherman ◽  
Nicolae Popa ◽  
Dumitru Popescu ◽  
Carmen Buzatu ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Culture Media ◽  
Fermentable Sugars ◽  
Cellulolytic Enzymes ◽  
Crystalline Cellulose ◽  
Agricultural Biomass ◽  
Residual Biomass ◽  
Hydrolysis Process ◽  
High Yields ◽  
Hydrolysis Of

Agricultural lignocellulosic biomass is regarded as an important source of biofuels, especially bioethanol and biohydrogen. The following aspects have been studied: the effect of type of substrate used in production of cellulolytic enzymes, the activity of several enzymatic cocktails used to hydrolyse three types of agricultural biomass and the influence of provenience of enzymatic cocktails on sugars yields in the hydrolysis process. Fungi investigated in this study (T. longibrachiatum DSM 769) release higher titter of enzymes when raw, unpretreated agriculture residual biomass is used as substrate and inducer for biosynthesis of cellulolytic enzymes. Cellulolytic enzymes produced in culture media containing a certain type of agricultural lignocellulosic biomass as substrate, can be used in hydrolysis of other types of agricultural lignocellulosic biomass with similar sugar yields. Cellulases produced in culture media containing purified crystalline cellulose as substrate does not contain all necessary types of enzymes to hydrolyze lignocellulosic complex from agricultural biomass to produce high yields of sugars. On-site production of cellulases can be an effective approach biorefinery of lignocellulose to produce biofuels or other biochemicals by fermentation.

Sign in / Sign up

Export Citation Format

Share Document