Notes: Reaction of Cyclohexanone and Hydrogen Peroxide with Ferrous Sulfate and Dimethyl Maleate

1958 ◽  
Vol 23 (7) ◽  
pp. 1066-1068 ◽  
Author(s):  
G Payne ◽  
C Smith
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Dimethyl Maleate

Control of 2-Methylisoborneol and Geosmin by Ozone and Peroxone: A Pilot Study

1992 ◽  
Vol 25 (2) ◽  
pp. 291-298 ◽  
Author(s):  
B. Koch ◽  
J. T. Gramith ◽  
M. S. Dale ◽  
D. W. Ferguson
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Contact Time ◽  
Pilot Scale ◽  
Ozone Dose ◽  
Ammonia Addition ◽  
Removal Efficiencies ◽  
Odorous Compounds ◽  
Water District ◽  
Percent Removal

A pilot-scale study of ozone and PEROXONE (ozone in combination with hydrogen peroxide) for the removal of the odorous compounds 2-methylisoborneol (MIB) and geosmin in drinking water has been conducted at the Metropolitan Water District of Southern California. The study investigated the effects of ozone dosage, ratio of hydrogen peroxide to ozone (H202/03), and contact time. It was found that MIB and geosmin removal increased with higher applied ozone doses, but longer contact times over the range of 6-12 min were not significant. It was determined that 80-90 percent removal could be achieved with an ozone dose of approximately 4.0 mg/l, as compared to an ozone dose of approximately 2.0 mg/l at a H202/03 ratio of 0.2. Also investigated were the effects of alternative contactor configurations, ferrous sulfate as an alternative coagulant, bromide and ammonia addition, and simulated turbidity on the removal efficiencies of the two odorous compounds.

Acid-catalyzed rearrangement of hydroperoxides. II. Phenylcycloalkyl hydroperoxides

1968 ◽  
Vol 46 (9) ◽  
pp. 1561-1570 ◽  
Author(s):  
Glenn H. Anderson ◽  
James G. Smith
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Phenyl Group ◽  
Ring Expansion ◽  
Steric Interaction ◽  
Ring Strain ◽  
Mineral Acids ◽  
Acid Catalyzed

The acid-catalyzed rearrangement of 1-phenylcycloalkyl hydroperoxides has been investigated using the cyclohexyl, cyclopentyl, and cyclobutyl compounds. Evidence was sought for rearrangement of the cycloalkyl group in competition with migration of the phenyl group during the reaction. Such a rearrangement would result in ring expansion of the cycloalkyl group to give, ultimately, products formed by cycloalkyl ring opening.No evidence for such a reaction was found in the case of 1-phenylcyclohexyl hydroperoxide; only the expected products, phenol and cyclohexanone, were detected. However, rearrangement of 1-phenylcyclopentyl hydroperoxide gave, besides the expected phenol and cyclopentanone, significant amounts of the ring-opened compound 4-hydroxyvalerophenone as its acetate. A second product, 1-phenylcyclopentene, arose by elimination of hydrogen peroxide from the hydroperoxide.1-Phenylcyclobutyl hydroperoxide proved to undergo ring expansion with great facility. Only the ring expanded products, 2-phenyl-2-tetrahydrofuryl hydroperoxide and its corresponding peroxide, could be isolated in the treatment of 1-phenylcyclobutanol with hydrogen peroxide using catalytic amounts of mineral acids. However, in the absence of catalysts, 1-phenylcyclobutyl hydroperoxide was formed in detectable amounts and its presence was demonstrated by decomposition with ferrous sulfate to butyro-phenone and 1,6-dibenzoylhexane.It seems reasonable that ring strain is the factor promoting the ring expansion of 1-phenylcyclobutyl hydroperoxide. In the case of 1-phenylcyclopentyl hydroperoxide, it is suggested that the steric interaction of the ortho hydrogens of the phenyl group with the cyclopentyl ring protons has the effect of slowing the migration of the phenyl group sufficiently that alkyl migration can occur to give the observed ring-opened products.

Kinetic Study of Advanced Oxidation of Eosin Dye by Fenton's Reagent

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Phalguni Banerjee ◽  
Sunando DasGupta ◽  
Sirshendu De
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Oxidation Study ◽  
Dye Decomposition ◽  
Detailed Kinetic Model

An advanced oxidation study using Fenton's reagent, i.e., ferrous sulfate and hydrogen peroxide was carried out for studying oxidation of eosin dye. Effects of concentration of various reagents on the degradation of dye were explored during an advanced oxidation process. It was found that ferrous concentration plays a major role in dye decomposition. Rate of dye decomposition is faster with an increase in ferrous sulfate concentration compared to the increase in hydrogen peroxide concentration. A detailed kinetic model was proposed. Profiles for eosin, hydrogen peroxide and various intermediates were also generated. The rate constant of the reaction of eosin with a hydroxyl radical was found to be of the order of 109 l/mol.s.

Detoxification of acid pretreated spruce hydrolysates with ferrous sulfate and hydrogen peroxide improves enzymatic hydrolysis and fermentation

2014 ◽  
Vol 166 ◽  
pp. 559-565 ◽  
Author(s):  
Venkata Prabhakar Soudham ◽  
Tomas Brandberg ◽  
Jyri-Pekka Mikkola ◽  
Christer Larsson
Keyword(s):  
Hydrogen Peroxide ◽  
Enzymatic Hydrolysis ◽  
Ferrous Sulfate

Decolorization of textile wastewater by ozonation and Fenton's process

2002 ◽  
Vol 45 (12) ◽  
pp. 279-286 ◽  
Author(s):  
M.F. Sevimli ◽  
C. Kinaci
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Cod Removal ◽  
Color Removal ◽  
Ozone Dose ◽  
Fenton’S Oxidation ◽  
Removal Efficiencies ◽  
Fenton's Oxidation ◽  
Color And Cod Removal ◽  
Fenton's Process

The aim of this study is to investigate the effect of some operational parameters on the efficiency of ozonation and Fenton's process for decolorization and COD removal. Acid Red 337 and Reactive Orange 16 dye solutions and the effluents of acid and reactive dye-bath effluents were used in the experiments. The influence of ozone dose and pH for color and COD removal from the wastewater were studied. Increasing the ozone dose increased the rate constants, and color and COD removal efficiencies. Ozone consumption ratio per unit color and COD removal at any time was found to be almost the same while the applied ozone dose was different. pH did not significantly affect color and COD removal from the wastewater by ozonation. In spite of having high color removal efficiencies (60–91%), limited COD removal efficiencies between 9–17% at 30 minutes ozonation time were obtained. In the Fenton oxidation experiments, the effects of pH, temperature, dosage of ferrous sulfate and hydrogen peroxide, and the proper ratio of Fe(II)/H2O2 were studied. The result indicates that up to 99% color removal and 82% COD removal can be obtained by Fenton's oxidation. While Fenton's oxidation was greatly affected by the pH value, temperature of wastewater did not significantly affect the Fenton process for color removal. Increasing the dose of both hydrogen peroxide and ferrous sulfate enhanced the removal efficiencies of color and COD. Suitable ratios of Fe(II)/H2O2 were found to be between 0.5 and 0.83.

Experimental Study on Cyclohexane by Catalytic Oxidation Using H2O2/Ferrous Sulfate

2011 ◽  
Vol 233-235 ◽  
pp. 1288-1291
Author(s):  
Jiao Jing Zhang ◽  
Bing Bai ◽  
Hua Song
Keyword(s):  
Hydrogen Peroxide ◽  
Experimental Study ◽  
Reaction Time ◽  
Catalytic Oxidation ◽  
Ferrous Sulfate ◽  
Atmospheric Condition ◽  
Temperature Reaction ◽  
Catalyst Amount ◽  
Volume Reaction ◽  
Solvent Volume

Catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over ferrous sulfate catalyst at atmospheric condition was studied. Effect of the solvent volume, catalyst amount, hydrogen peroxide volume, reaction temperature, reaction time on reaction was investigated. Results showed that using 10 mL of acetone, 0.02 g of a ferrous sulfate and 0.5 mL of hydrogen peroxide at thereaction temperature of 80 °C for 8 h, the conversion of cyclohexane was 35.35%, the total selectivity of cyclohexanone and cyclohexanol was 94.06%.

34 OVINE SPERM IS HIGHLY SUSCEPTIBLE TO ATTACK BY HYDROGEN PEROXIDE

2010 ◽  
Vol 22 (1) ◽  
pp. 175
Author(s):  
E. G. A. Perez ◽  
M. Nichi ◽  
F. A. Oliveira Neto ◽  
R. O. C. Silva ◽  
A. Dalmazzo ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Lipid Peroxidation ◽  
Hydroxyl Radical ◽  
Ferrous Sulfate ◽  
Present Experiment ◽  
Membrane Integrity ◽  
Oxygen Species ◽  
Mitochondrial Potential ◽  
Ram Sperm

Ram sperm membrane displays a particular lipid composition, especially regarding the high quantity of polyunsaturated cholesterol. This trait improves membrane fluidity; however, the spermatozoa become more susceptible to the attack of reactive oxygen species (ROS), which may lead to structural and functional damage, impairment or even impeded fecundity. The aim of the present experiment was to study the resistance of ovine spermatozoa to different ROS. Sperm samples from 4 rams were collected using an artificial vagina. Sperm samples were then incubated (1 h, 37°C) with four ROS inducer mechanisms: xanthine/xanthine oxidase (produces superoxide anion), hydrogen peroxide (4 mM), ascorbate/ferrous sulfate (4 mM; produces hydroxyl radical), and malondialdehyde (MDA, lipid peroxidation product). Samples were analysed using the 3-3′ diamino benzidine (DAB) stain as an index of mitochondrial activity, the eosin nigrosin stain as an index of membrane integrity; the simple stain (fast green/Bengal rose) as an index of acrosome integrity; and the measurement of thiobarbituric acid reactive substances (TBARS) as an index of lipid peroxidation. Results showed that acrosome and membrane integrity as well as mitochondrial potential were highly impaired by hydrogen peroxide, which was not the case for the other ROS (Table 1). Surprisingly, TBARS production was higher in samples incubated with ascorbate and ferrous sulfate (hydroxyl radical). Furthermore, sperm showing impaired mitochondrial potential were negatively correlated with membrane and acrosome integrities (r = -0.83, P < 0.0001 and r = -0.62, P = 0.01, respectively). Results of the present experiment suggest that semen of rams is extremely susceptible to attack by hydrogen peroxide. However, the mechanism by which this substance impairs sperm quality apparently does not involve oxidative stress, because no increase in TBARS was observed. Despite the necessity of further studies to investigate how hydrogen peroxide negatively influences sperm function, the use of catalase and glutathione peroxidase, important hydrogen peroxide scavengers, appears to be an alternative to improve the quality of ram sperm. Table 1.Effect of different reactive oxygen species in semen of rams The authors thank Nutricell for the media used in the experiment and CAPES for financial support.

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