THE DEMETHYLATION OF SUGARS WITH HYDROGEN PEROXIDE

1961 ◽  
Vol 39 (3) ◽  
pp. 555-563 ◽  
Author(s):  
B. Fraser-Reid ◽  
J. K. N. Jones ◽  
M. B. Perry
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Iron ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Methyl Methyl ◽  
Methyl Derivatives ◽  
Derivatives Of

Demethylation of methylated sugars can be achieved using hydrogen peroxide and ferrous iron (Fenton's reagent). The reaction is not specific and further oxidation of the sugar also occurs. The preparation of 3,4-di-O-methyl-D-mannose from the corresponding mannitol derivative is described. Mono-O-methyl derivatives of D-mannose and of D-mannitol as well as D-mannose and D-mannitol were also produced. The course of the demethylation of 2,3,4,6-tetra-O-methyl methyl α-D-glucoside by Fenton's reagent has been examined.

Chemical destruction of MTBE using Fenton's Reagent: effect of ferrous iron/hydrogen peroxide ratio

2003 ◽  
Vol 47 (9) ◽  
pp. 165-171 ◽  
Author(s):  
A. Burbano ◽  
D. Dionysiou ◽  
M. Suidan ◽  
T. Richardson
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Iron ◽  
Degradation Process ◽  
Methyl Tert Butyl Ether ◽  
Molar Ratio ◽  
Limiting Factor ◽  
Fenton’S Reagent ◽  
Butyl Ether ◽  
Fenton's Reagent ◽  
Mtbe Degradation

In previous laboratory experiments Fenton's Reagent (FR) was successfully used as the source of hydroxyl radicals (OH•) for chemical treatment of low concentrations of methyl tert-butyl ether (MTBE) in water. Although under certain conditions MTBE degradation levels as high as 99.99% were achieved, none of these experiments resulted in complete MTBE mineralization. In all cases, these experiments applied FR as an equimolar concentration of ferrous iron (Fe2+) and hydrogen peroxide (H2O2). The present study investigates the effect of H2O2/Fe2+ molar ratio on the extent of degradation of MTBE and intermediate products in water at pH = 3.0. The initial concentration of MTBE studied was 0.0227 mM (approximately 2 mg/L). Initially, the dose of Fe2+ was kept constant at a Fe2+/MTBE molar ratio of 10:1 and the dose of H2O2 was varied to achieve different H2O2/Fe2+ molar ratios. The results revealed that higher degradation efficiency was achieved when FR was used as an equimolar mixture (H2O2/Fe2+ molar ratio = 1.0). The extent of MTBE degradation decreased when the H2O2/Fe2+ molar ratio was changed to values higher or lower than 1.0. These results suggest that a stoichiometric relationship (1:1) between the FR components optimizes the degradation process for this reactant system. It is hypothesized that an excess of H2O2 enhances the effect of reactions that scavenge OH•, while a decreased amount of H2O2 would be a limiting factor for the Fenton Reaction.

Comparison Between the Classical and the Electrochemical Fenton Systems for Atrazine Degradation in Acidic Medium

2002 ◽  
Vol 5 (1) ◽  
Author(s):  
A. Ventura ◽  
G. Jacquet ◽  
V. Camel ◽  
A. Bermond
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compound ◽  
Ferrous Iron ◽  
Acidic Medium ◽  
Chemical Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Refractory Compounds ◽  
Electrochemical Fenton ◽  
Fenton System

AbstractThe degradation of chemicals in water is commonly performed using chemical oxidation. In case of refractory compounds, hydroxyl radicals have to be involved for their degradation. Several systems may be used to generate OH°, such as the ferrous iron-hydrogen peroxide system (Fenton’s reagent). However, when this reagent is prepared by mixing the two constituents, the oxidation of an organic compound is difficult to control and the ferrous iron regeneration is limited. So, very recently, electrochemical systems have merged that allow the electrochemical production of ferrous iron and/or hydrogen peroxide, thereby allowing the generation of OH°. In this paper, the efficiency of a simple electro-Fenton system in degrading chemicals in acidic medium is shown. Atrazine was chosen as a model organic compound. In addition, the electrochemical system compared favorably with the classical Fenton’s reagent under similar conditions, as it allowed a more thorough oxidation of atrazine.

Coagulation of textile secondary effluents with Fenton's reagent

1997 ◽  
Vol 36 (12) ◽  
pp. 215-222 ◽  
Author(s):  
Shyh-Fang Kang ◽  
Huey-Min Chang
Keyword(s):  
Hydrogen Peroxide ◽  
Cod Removal ◽  
Color Removal ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Effluent Standards ◽  
Secondary Effluents ◽  
Removal Efficiencies

This study was designed to use both artificial and real textile secondary effluents to evaluate (1) the COD and color removal efficiencies for ferrous coagulation and Fenton's coagulation, and (2) the feasibility of using hydrogen peroxide to improve ferrous coagulation to meet more stringent effluent standards. The results indicate that the optimum pHs for both ferrous coagulation and Fenton's preoxidation processes range between 8.0–10 and 3.0–5.0, respectively. The rate for color removal is faster than that for COD removal in the Fenton's preoxidation process. The removals of COD and color are mainly accomplished during Fenton's preoxidation step. The ratio of COD removal for Fenton's coagulation versus ferrous coagulation, given the same ferrous dosage, ranges from 1.4 to 2.3, and it ranges from 1.1 to 1.9 for color removal, using two effluent samples. Therefore, using hydrogen peroxide can enhance the ferrous coagulation, and this ensures more stringent effluent standards of COD and color are met.

Thiocyanation of N-aryl, N-acetyl, and N-[arylsulfonylimino(methyl)methyl] derivatives of 1,4-benzoquinone monoimine

2014 ◽  
Vol 50 (5) ◽  
pp. 635-646 ◽  
Author(s):  
S. A. Konovalova ◽  
A. P. Avdeenko ◽  
O. P. Ledeneva ◽  
A. L. Yusina ◽  
V. V. Pirozhenko ◽  
...  
Keyword(s):  
Methyl Methyl ◽  
Methyl Derivatives ◽  
Derivatives Of

Effect of Contaminant Hydrophobicity in the Treatment of Contaminated Soils by Catalyzed H2O2 Propagations (Modified Fenton’s Reagent)

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Richard J. Watts ◽  
Tanya M. Haeri-McCarroll ◽  
Amy L. Teel
Keyword(s):  
Hydrogen Peroxide ◽  
Contaminated Soils ◽  
Fenton’S Reagent ◽  
Fenton's Reagent

AbstractThe effect of contaminant hydrophobicity on hydrogen peroxide dosage requirements in the treatment of contaminated soils using catalyzed H

scholarly journals Synthesis and Elimination Reaction ofO-Methyl Derivatives of Methyl (Methyl α-D-Glucopyranosido)uronate

1971 ◽  
Vol 44 (1) ◽  
pp. 235-239 ◽  
Author(s):  
Hironobu Hashimoto ◽  
Takeshi Sekiyama ◽  
Hideo Sakai ◽  
Juji Yoshimura
Keyword(s):  
Elimination Reaction ◽  
Methyl Methyl ◽  
Methyl Derivatives ◽  
Derivatives Of

Ascorbic acid and hydrogen peroxide (Fenton's reagent) induced changes in gelatin systems

2003 ◽  
Vol 17 (3) ◽  
pp. 321-326 ◽  
Author(s):  
Asgar Farahnaky ◽  
David A Gray ◽  
John R Mitchell ◽  
Sandra E Hill
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Induced Changes

Study of the decomposition of four commercially available hydrogen peroxide solutions by Fenton's reagent

1997 ◽  
Vol 69 (5) ◽  
pp. 1052-1056 ◽  
Author(s):  
Brian K. Aldershof ◽  
Ronald M. Dennis ◽  
Craig J. Kunitsky
Keyword(s):  
Hydrogen Peroxide ◽  
Fenton’S Reagent ◽  
Fenton's Reagent

scholarly journals Comparison of Landfill Leachate Treatment Efficiency Using the Advanced Oxidation Processes

2013 ◽  
Vol 39 (2) ◽  
pp. 107-115 ◽  
Author(s):  
Barbara Pieczykolan ◽  
Izabela Płonka ◽  
Krzysztof Barbusiński ◽  
Magdalena Amalio-Kosel
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compounds ◽  
Advanced Oxidation Processes ◽  
Potassium Dichromate ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Nitrogen And Phosphorus ◽  
Leachate Treatment ◽  
Fenton's Reagent ◽  
Oxidation Processes

Abstract Treatment of leachate from an exploited since 2004 landfill by using two methods of advanced oxidation processes was performed. Fenton’s reagent with two different doses of hydrogen peroxide and iron and UV/H2O2 process was applied. The removal efficiency of biochemically oxidizable organic compounds (BOD5), chemically oxidizable compounds using potassium dichromate (CODCr) and nutrient (nitrogen and phosphorus) was examined. Studies have shown that the greatest degree of organic compounds removal expressed as a BOD5 index and CODCr index were obtained when Fenton’s reagent with greater dose of hydrogen peroxide was used - efficiency was respectively 72.0% and 69.8%. Moreover, in this case there was observed an increase in the value of ratio of BOD5/CODCr in treated leachate in comparison with raw leachate. Application of Fenton’s reagent for leachate treatment also allowed for more effective removal of nutrients in comparison with the UV/H2O2 process.

Sign in / Sign up

Export Citation Format

Share Document