Deconstruction of oriented crystalline cellulose by novel levulinic acid based deep eutectic solvents pretreatment for improved enzymatic accessibility

2020 ◽  
Vol 305 ◽  
pp. 123025 ◽  
Author(s):  
Zhe Ling ◽  
Zongwei Guo ◽  
Caoxing Huang ◽  
Lei Yao ◽  
Feng Xu
Keyword(s):  
Levulinic Acid ◽  
Deep Eutectic Solvents ◽  
Crystalline Cellulose ◽  
Enzymatic Accessibility

scholarly journals Selective recovery of zinc from goethite residue in the zinc industry using deep-eutectic solvents

RSC Advances ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 7328-7335 ◽  
Author(s):  
Nerea Rodriguez Rodriguez ◽  
Lieven Machiels ◽  
Bieke Onghena ◽  
Jeroen Spooren ◽  
Koen Binnemans
Keyword(s):  
Levulinic Acid ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Selective Recovery ◽  
Industrial Residues ◽  
Zinc Industry

A mixture of levulinic acid and choline chloride can be used to selectively leach zinc from industrial residues with iron-rich matrices.

Hydrophobic Deep Eutectic Solvents for the Recovery of Bio-Based Chemicals: Solid–Liquid Equilibria and Liquid–Liquid Extraction

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 796
Author(s):  
Thomas Brouwer ◽  
Bas C. Dielis ◽  
Jorrit M. Bock ◽  
Boelo Schuur
Keyword(s):  
Lactic Acid ◽  
Formic Acid ◽  
Levulinic Acid ◽  
Deep Eutectic Solvents ◽  
Liquid Extraction ◽  
Lewis Base ◽  
Trioctylphosphine Oxide ◽  
Base Interaction ◽  
Liquid Liquid Extraction ◽  
Solid Liquid

The solid–liquid equilibrium (SLE) behavior and liquid–liquid extraction (LLX) abilities of deep eutectic solvents (DESs) containing (a) thymol and L-menthol, and (b) trioctylphosphine oxide (TOPO) and L-menthol were evaluated. The distribution coefficients (KD) were determined for the solutes relevant for two biorefinery cases, including formic acid, levulinic acid, furfural, acetic acid, propionic acid, butyric acid, and L-lactic acid. Overall, for both cases, an increasing KD was observed for both DESs for acids increasing in size and thus hydrophobicity. Furfural, being the most hydrophobic, was seen to extract the highest KD (for DES (a) 14.2 ± 2.2 and (b) 4.1 ± 0.3), and the KD of lactic acid was small, independent of the DESs (DES (a) 0.5 ± 0.07 and DES (b) 0.4 ± 0.05). The KD of the acids for the TOPO and L-menthol DES were in similar ranges as for traditional TOPO-containing composite solvents, while for the thymol/L-menthol DES, in the absence of the Lewis base functionality, a smaller KD was observed. The selectivity of formic acid and levulinic acid separation was different for the two DESs investigated because of the acid–base interaction of the phosphine group. The thymol and L-menthol DES was selective towards levulinic acid (Sij = 9.3 +/− 0.10, and the TOPO and L-menthol DES was selective towards FA (Sij = 2.1 +/− 0.28).

scholarly journals A Comprehensive Study of CO2 Absorption and Desorption by Choline-Chloride/Levulinic-Acid-Based Deep Eutectic Solvents

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5595
Author(s):  
Mohaned Aboshatta ◽  
Vitor Magueijo
Keyword(s):  
Hydrogen Bond ◽  
Co2 Capture ◽  
Levulinic Acid ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Absorption Capacity ◽  
Co2 Absorption ◽  
Operating Pressure ◽  
Hydrogen Bond Acceptor ◽  
Different Temperatures

Amine absorption (or amine scrubbing) is currently the most established method for CO2 capture; however, it has environmental shortcomings and is energy-intensive. Deep eutectic solvents (DESs) are an interesting alternative to conventional amines. Due to their biodegradability, lower toxicity and lower prices, DESs are considered to be “more benign” absorbents for CO2 capture than ionic liquids. In this work, the CO2 absorption capacity of choline-chloride/levulinic-acid-based (ChCl:LvAc) DESs was measured at different temperatures, pressures and stirring speeds using a vapour–liquid equilibrium rig. DES regeneration was performed using a heat treatment method. The DES compositions studied had ChCl:LvAc molar ratios of 1:2 and 1:3 and water contents of 0, 2.5 and 5 mol%. The experimental results showed that the CO2 absorption capacity of the ChCl:LvAc DESs is strongly affected by the operating pressure and stirring speed, moderately affected by the temperature and minimally affected by the hydrogen bond acceptor (HBA):hydrogen bond donator (HBD) molar ratio as well as water content. Thermodynamic properties for CO2 absorption were calculated from the experimental data. The regeneration of the DESs was performed at different temperatures, with the optimal regeneration temperature estimated to be 80 °C. The DESs exhibited good recyclability and moderate CO2/N2 selectivity.

Investigation of a deep eutectic solvent formed by levulinic acid with quaternary ammonium salt as an efficient SO2 absorbent

2015 ◽  
Vol 39 (10) ◽  
pp. 8158-8164 ◽  
Author(s):  
Dongshun Deng ◽  
Guoqiang Han ◽  
Yaotai Jiang
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Levulinic Acid ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Separation Performance

Six new deep eutectic solvents with good absorption and separation performance for SO2 were developed.

scholarly journals Separation of Benzene-Cyclohexane Azeotropes Via Extractive Distillation Using Deep Eutectic Solvents as Entrainers

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 336
Author(s):  
Fang Bai ◽  
Chao Hua ◽  
Jing Li
Keyword(s):  
Atmospheric Pressure ◽  
Levulinic Acid ◽  
Petrochemical Industry ◽  
Choline Chloride ◽  
Tetrabutylammonium Bromide ◽  
Deep Eutectic Solvents ◽  
Extractive Distillation ◽  
Liquid Equilibrium ◽  
Ft Ir ◽  
Modelling Approach

The separation of benzene and cyclohexane azeotrope is one of the most challenging processes in the petrochemical industry. In this paper, deep eutectic solvents (DES) were used as solvents for the separation of benzene and cyclohexane. DES1 (1:2 mix of tetrabutylammonium bromide (TBAB) and levulinic acid (LA)), DES2 (1:2 mix of TBAB and ethylene glycol (EG)) and DES3 (1:2 mix of ChCl (choline chloride) and LA) were used as entrainers, and vapor-liquid equilibrium (VLE) measurements at atmospheric pressure revealed that a DES comprised of a 2:1 ratio of LA and TBAB could break this azeotrope with relative volatility (αij) up to 4.763. Correlation index suggested that the NRTL modelling approach fitted the experimental data very well. Mechanism of extractive distillation gained from FT-IR revealed that with hydrogen bonding and π–π bond interactions between levulinic acid and benzene could be responsible for the ability of this entrainer to break the azeotrope.

scholarly journals Natural deep eutectic solvents as tailored and sustainable media for the extraction of five compounds from compound liquorice tablets and their comparison with conventional organic solvents

RSC Advances ◽  
2021 ◽  
Vol 11 (59) ◽  
pp. 37649-37660
Author(s):  
Jia-ni Dong ◽  
Guo-dong Wu ◽  
Zhi-qiang Dong ◽  
Dan Yang ◽  
Yu-kun Bo ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Levulinic Acid ◽  
Extraction Efficiency ◽  
Antioxidant Activities ◽  
Deep Eutectic Solvents ◽  
Acid System ◽  
Natural Deep Eutectic Solvents ◽  
Extraction Parameters ◽  
Sustainable Media

A 1,4-butanediol–levulinic acid system was selected as a topgallant solvent and extraction parameters were optimized. NADES extracts exhibited higher extraction efficiency and in vitro antioxidant activities than conventional solvent extracts.

Sign in / Sign up

Export Citation Format

Share Document