Wet oxidation of lignin model compounds and acetic acid production

2006 ◽  
Vol 41 (5) ◽  
pp. 1591-1597 ◽  
Author(s):  
H. Suzuki ◽  
J. Cao ◽  
F. Jin ◽  
A. Kishita ◽  
H. Enomoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acid Production ◽  
Wet Oxidation ◽  
Model Compounds ◽  
Acetic Acid Production ◽  
Lignin Model Compounds ◽  
Lignin Model

Investigating homogeneous Co/Br−/H2O2 catalysed oxidation of lignin model compounds in acetic acid

2019 ◽  
Vol 9 (2) ◽  
pp. 384-397 ◽  
Author(s):  
Edwin B. Clatworthy ◽  
Julia L. Picone-Murray ◽  
Alexander K. L. Yuen ◽  
Richard T. Maschmeyer ◽  
Anthony F. Masters ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Catalytic Oxidation ◽  
Product Yield ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Catalysed Oxidation ◽  
Substrate Conversion ◽  
Lignin Model

The catalytic oxidation of lignin model compounds by Co/Br−/H2O2 is investigated; substituting Br− for N-hydroxyphthalimide improved substrate conversion and product yield.

Mechanistic studies on the VO(acac)2-catalyzed oxidative cleavage of lignin model compounds in acetic acid

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 110229-110234 ◽  
Author(s):  
Yangyang Ma ◽  
Zhongtian Du ◽  
Fei Xia ◽  
Jiping Ma ◽  
Jin Gao ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Reaction Pathway ◽  
Aerobic Oxidation ◽  
Oxidative Cleavage ◽  
Mechanistic Studies ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model ◽  
Selective Aerobic Oxidation ◽  
Catalyzed Oxidation

Selective aerobic oxidation has provided a promising approach for breaking lignin into smaller aromatics. Here, the reaction pathway of VO(acac)2-catalyzed oxidation of lignin model 2-phenoxy-1-phenylethanol in acetic acid was studied.

Effect of Lignin on Acetic Acid Production in Wet Oxidation of Lignocellulosic Wastes

2004 ◽  
Vol 33 (7) ◽  
pp. 910-911 ◽  
Author(s):  
Fangming Jin ◽  
Jianxun Cao ◽  
Zhouyu Zhou ◽  
Takehiko Moriya ◽  
Heiji Enomoto
Keyword(s):  
Acetic Acid ◽  
Acid Production ◽  
Wet Oxidation ◽  
Acetic Acid Production ◽  
Lignocellulosic Wastes

Evaluation of a two-stage hydrothermal process for enhancing acetic acid production using municipal biosolids

2012 ◽  
Vol 65 (1) ◽  
pp. 149-155 ◽  
Author(s):  
Anderson Aggrey ◽  
Peter Dare ◽  
Robert Lei ◽  
Daniel Gapes
Keyword(s):  
Acetic Acid ◽  
Acid Production ◽  
Oxidation Process ◽  
Hydrothermal Process ◽  
Wet Oxidation ◽  
Thermal Hydrolysis ◽  
Two Stage ◽  
Acetic Acid Production ◽  
Stage Process ◽  
Municipal Biosolids

A two-stage hydrothermal process aimed at improving acetic acid production using municipal biosolids was evaluated against thermal hydrolysis and conventional wet oxidation process in a 600 ml Parr batch reactor. Thermal hydrolysis was conducted at 140 °C, wet oxidation at 220 °C and the two-stage process, which acted as a series combination of thermal hydrolysis and wet oxidation, at 220 °C. Initial pressure of 1 MPa was maintained in all the three processes. The results indicated that the highest acetic acid production of up to 58 mg/g dry solids feed was achieved in the wet oxidation process followed by the two-stage process with 36 mg/g dry solids feed and 1.8 mg/g dry solids feed for thermal hydrolysis. The acetic acid yield obtained by the thermal processes increased from 0.4% in the thermal hydrolysis process to 12% during the single stage wet oxidation, with the two-stage process achieving 8%. The purity of the acetic acid improved from 1% in thermal hydrolysis to 38% in the wet oxidation process. The two-stage process achieved acetic acid purity of 25%. This work demonstrated no enhancement of acetic acid production by the two-stage concept compared with the single stage wet oxidation process. This is in contrast to similar work by other researchers, investigated on carbohydrate biomass and vegetable wastes using hydrogen peroxide as the oxidant. However, the data obtained revealed that substrate specificity, reaction severity or oxidant type is clearly important in promoting reaction mechanisms which support enhanced acetic acid production using municipal biosolids.

Lignin to Value-Added Chemical Synthesis

2020 ◽  
Vol 16 ◽  
Author(s):  
Mahdieh Sharifi ◽  
Ramyakrishna Pothu ◽  
Rajender Boddula ◽  
Inamuddin
Keyword(s):  
Ionic Liquids ◽  
Lignocellulosic Biomass ◽  
Academic Research ◽  
Power Saving ◽  
Value Added ◽  
Glycerol Ether ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Biomass Activity ◽  
Lignin Model

Background: There is a developing demand for innovation in petroleum systems replacements. Towards this aim, lignocellulosic biomass suggested as a possible sustainable source for the manufacturing of fuels and produced chemicals. The aims of this paper are to investigate different kinds of β-O-4 lignin model compounds for the production of value-added chemicals in presence of ionic liquids. Especially, a cheap β-O-4 lignin model Guaiacol glycerol ether (GGE) (Guaifenesin) is introduced to produce valuable chemicals and novel products. Methods: Research related to chemical depolymerization of lignocellulosic biomass activity is reviewed, the notes from different methods such as thermal and microwave collected during at least 10 years. So, this collection provides a good source for academic research and it gives an efficient strategy for the manufacturing of novel value-added chemicals at an industrial scale. Results: This research presented that ionic liquid microwave-assisted is a power saving, cost efficient, fast reaction, and clean way with high selectively and purity for production of high value chemicals rather that conversional heating. Guaiacol and catechol are some of these valuable chemicals that is produced from β-O-4 lignin model compounds with high word demands that are capable to produce in industry scale. Conclusion: The β-O-4 lignin model compounds such as Guaiacol glycerol ether (GGE) (Guaifenesin) are good platform for developing food materials, perfumery, biorefinery, and pharmaceutical industry by ionic liquids-assisted lignin depolymerization method.

Insights into the electrochemical degradation of phenolic lignin model compounds in protic ionic liquid-water system

2021 ◽  
Author(s):  
Guangyong Liu ◽  
Qian Wang ◽  
Dongxia Yan ◽  
Yaqin Zhang ◽  
Chenlu Wang ◽  
...  
Keyword(s):  
Water System ◽  
Value Added ◽  
Electrochemical Degradation ◽  
Aryl Ether ◽  
Model Compounds ◽  
Protic Ionic Liquid ◽  
Lignin Model Compounds ◽  
Mild Conditions ◽  
System P ◽  
Lignin Model

Cleavage of aryl ether (Caryl-O) bonds is crucial for conversion and value-added utilization of lignin and its derivatives, but remains extremely challenging under mild conditions due to strong Caryl-O linkages....

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