Equilibrium Studies on the System Water + Hydrogen Peroxide + Urea + Carbon Dioxide

2010 ◽  
Vol 55 (12) ◽  
pp. 5715-5718 ◽  
Author(s):  
Haibin Liu ◽  
Jilin Cao ◽  
Changhong Gao ◽  
Jianjun Zhao
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Equilibrium Studies ◽  
System Water ◽  
Water Hydrogen

ELECTROLYTIC CONDUCTANCE IN HYDROGEN PEROXIDE – WATER MIXTURES: PART II. SOME MONOBASIC AND DIBASIC ACIDS

1958 ◽  
Vol 36 (5) ◽  
pp. 744-749 ◽  
Author(s):  
D. K. Thomas ◽  
O. Maass
Keyword(s):  
Hydrogen Peroxide ◽  
Marked Decrease ◽  
Current Method ◽  
Strong Acid ◽  
Weak Acid ◽  
Electrolytic Conductance ◽  
Degrees Of Dissociation ◽  
System Water ◽  
Water Hydrogen ◽  
Made In

Measurements of the equivalent conductance of sulphuric, nitric, and hydrofluoric acids were made in water – hydrogen peroxide mixtures by means of a direct-current method. It was found that in solvents containing a high percentage of hydrogen peroxide the conductivities of these acids were extremely low, and it is proposed that this results from a marked decrease in their degrees of dissociation. This proposal is supported by similar measurements made on the system water – strong acid – weak acid.

scholarly journals Crystallization and preliminary X-ray analysis of formate oxidase, an enzyme of the glucose–methanol–choline oxidoreductase family

2010 ◽  
Vol 66 (9) ◽  
pp. 1064-1066 ◽  
Author(s):  
Yoshifumi Maeda ◽  
Daiju Doubayashi ◽  
Takumi Ootake ◽  
Masaya Oki ◽  
Bunzo Mikami ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Single Crystal ◽  
Aspergillus Oryzae ◽  
Diffraction Data ◽  
Diffusion Method ◽  
Hanging Drop ◽  
Space Group ◽  
X Ray ◽  
Vapour Diffusion

Formate oxidase (FOD), which catalyzes the oxidation of formate to yield carbon dioxide and hydrogen peroxide, belongs to the glucose–methanol–choline oxidoreductase (GMCO) family. FOD fromAspergillus oryzaeRIB40, which has a modified FAD as a cofactor, was crystallized at 293 K by the hanging-drop vapour-diffusion method. The crystal was orthorhombic and belonged to space groupC2221. Diffraction data were collected from a single crystal to 2.4 Å resolution.

Equilibrium Studies on the System H2O-H2O2-CO(NH2)2-C3H8

2011 ◽  
Vol 233-235 ◽  
pp. 1690-1693
Author(s):  
Yu Ming Gao ◽  
Ji Lin Cao ◽  
Panpan Chen ◽  
Hong Fei Guo ◽  
Zhao Yang Tan
Keyword(s):  
Hydrogen Peroxide ◽  
Gas Hydrate ◽  
Mother Liquor ◽  
Quaternary System ◽  
Hydrate Formation ◽  
Calculated Data ◽  
Equilibrium Studies ◽  
Equilibrium Pressure ◽  
Gas Hydrate Formation ◽  
Very High

The phase equilibrium of the quaternary system H2O-H2O2-CO(NH2)2-C3H8 with gas hydrate formation had been studied at high pressure and low temperature. The temperature and pressure of gas hydrate formed from different hydrogen peroxide concentration aqueous were determined at adding surfactants and no surfactants separately. It was concluded that the equilibrium pressure of gas hydrate formation was increasing with the increase of the hydrogen peroxide concentration, the urea concentration and the temperature, the mother liquor amount entrained in the gas hydrate after liquid separation by sinking was very high when surfactants was not added, but the equilibrium pressure of gas hydrate formation was decreased and the mother liquor amount entrained in gas hydrate was also decreased when surfactants was added to the system. In addition, the equilibrium pressure of gas hydrate formation in the quaternary system H2O-H2O2-CO(NH2)2-C3H8 was calculated according to Chen-Guo thermodynamic model, improved UNIFAC mathematical equation and Aasberg-Peterson fugacity coefficient model. The calculated data was in agreement with the experiment data.

Influence of Compressed Carbon Dioxide on the Oxidation of Cyclohexane with Hydrogen Peroxide in Acetic Acid

2006 ◽  
Vol 59 (3) ◽  
pp. 225 ◽  
Author(s):  
Liang Gao ◽  
Tao Jiang ◽  
Buxing Han ◽  
Baoning Zong ◽  
Xiaoxin Zhang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Binary System ◽  
Reaction System ◽  
Phase Region ◽  
Phase Behaviour ◽  
Phase System ◽  
Two Phase ◽  
Three Phase

The oxidation of cyclohexane with H2O2 in a compressed CO2/acetic acid binary system was studied at 60.0 and 80.0°C, at pressures up to 18 MPa, and with the zeolite TS-1 as catalyst. The phase behaviour of the reaction system was also observed. There are three fluid phases in the reaction system at lower pressure but two at higher pressures. In the three-phase region the yields of the products, cyclohexanol and cyclohexanone, increase considerably with increasing pressure and reaches a maximum near the phase-separating pressure. CO2 can thus enhance the reaction effectively. However, the effect of pressure on the yield is very limited after the transition to a two-phase system.

A Oxidative Desulfurization System for Model Oil with Hydrogen Peroxide in the Presence of Solid Acid Catalyst

2013 ◽  
Vol 699 ◽  
pp. 68-71 ◽  
Author(s):  
Liang Wang ◽  
Zi Zhen Li ◽  
Chun Hu Li ◽  
Li Juan Feng
Keyword(s):  
Hydrogen Peroxide ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Oxidative Desulfurization ◽  
Acid Catalyst ◽  
Oxidizing Agent ◽  
Model Compounds ◽  
Model Oil ◽  
System Water ◽  
Oxidative System

Oxidative desulfurization of model oil was conducted in emulsion oxidative system (water –in-oil [W/O]) using hydrogen peroxide as the oxidizing agent, N-methyl-2-pyrrolidone (NMP) and water as extractive solvent, span60 as surfactant. The system was evaluated for oxidative desulfurization of BT, DBT and 4.6-DMDBT using hydrogen peroxide as oxidant and exhibit excellent activities in oxidative desulfurization of model compounds.

REACTIONS IN DISSOCIATED WATER VAPOR

1951 ◽  
Vol 29 (11) ◽  
pp. 996-1009 ◽  
Author(s):  
R. A. Jones ◽  
C. A. Winkler
Keyword(s):  
Hydrogen Peroxide ◽  
Water Vapor ◽  
Room Temperature ◽  
Reaction Chamber ◽  
Glass Wool ◽  
Cold Trap ◽  
Slight Effect ◽  
Reaction Chambers ◽  
Limiting Value ◽  
Water Hydrogen

Water vapor dissociated by an electric discharge and passed into a cold trap yielded products which gave off oxygen at temperatures above −120°C. and at room temperature consisted of hydrogen peroxide and water. With products formed under given conditions, the amount of oxygen evolved with warming was proportional to the total amount of product and independent of the warming procedure. The evolution proceeded to completion at −78°C. Water was found at all trap temperatures between −78°C. and −195°C. Hydrogen peroxide was formed only if the trap temperature was below −120°C., and oxygen was evolved only from products formed below −150°C. The yields of water, hydrogen peroxide, and evolved oxygen all increased with decreasing trap temperature. As the volume of reaction chambers inserted between the discharge tube and the trap was increased, the yield of hydrogen peroxide decreased continuously, while the yield of water at first decreased and then increased to a limiting value. Packing a given reaction chamber with glass wool drastically reduced the yield of hydrogen peroxide, but had little effect on the yield of water. Packing the trap itself had only a slight effect on the yields. The results are compared with those obtained by others with the H–O2 system at low temperatures, and a mechanism is proposed to correlate the two systems.

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