THE CATALYTIC OXIDATION OF ETHYLENE TO ETHYLENE OXIDE

1949 ◽  
Vol 27b (11) ◽  
pp. 813-827 ◽  
Author(s):  
F. L. W. McKim ◽  
A. Cambron
Keyword(s):  
Ethylene Oxide ◽  
Catalytic Oxidation ◽  
Atmospheric Pressure ◽  
Reaction Rate ◽  
Ethylene Dichloride ◽  
Complete Oxidation ◽  
Large Excess ◽  
Ethylene Concentration ◽  
Silver Catalysts ◽  
Flow Experiments

The catalytic oxidation of ethylene to ethylene oxide was investigated in flow experiments over silver catalysts at atmospheric pressure between 260° and 350 °C. Calcium oxalate and stannous oxide were used as catalyst promoters. Close temperature control was provided by mounting the catalyst on a silver support. At 270 °C. the selectivity increased from about 25%, with ethylene in large excess, to about 55%, with oxygen in large excess. With air constant and in large excess, the over-all reaction rate was found to be proportional to the square root of the ethylene concentration. With ethylene constant and in large excess, the reaction rate was found to be roughly proportional to the oxygen concentration. The presence of methane, ethane, or propane promoted the complete oxidation of ethylene to carbon dioxide and water. In the absence of paraffins the addition of traces of ethylene dichloride only served to poison the catalyst.

QUANTITATIVE GAS CHROMATOGRAPHY OF REACTION PRODUCTS FROM THE CATALYTIC OXIDATION OF ETHYLENE

1959 ◽  
Vol 37 (4) ◽  
pp. 708-713 ◽  
Author(s):  
C. H. Amberg ◽  
E. Echigoya ◽  
D. Kulawic
Keyword(s):  
Carbon Dioxide ◽  
Gas Chromatography ◽  
Water Vapor ◽  
Quantitative Analysis ◽  
Ethylene Oxide ◽  
Catalytic Oxidation ◽  
Reaction Products ◽  
Gas Chromatograph ◽  
Large Excess ◽  
Two Stage

A simple two-stage gas chromatograph is described which employs only one detector for both effluent streams. It was designed specifically for the routine quantitative analysis of mixtures of ethylene oxide, carbon dioxide, and ethylene in the presence of water vapor and a large excess of air, and for concentrations down to 0.2% by volume of individual components.

Complete phenol removal in liquid-phase under moderate condition over Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 catalysts

2020 ◽  
Vol 13 (07) ◽  
pp. 2050030
Author(s):  
Abdul Rohman Supandi ◽  
Naoyoshi Nunotani ◽  
Nobuhito Imanaka
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Atmospheric Pressure ◽  
Phenol Removal ◽  
Complete Oxidation ◽  
Oxygen Release ◽  
Moderate Condition ◽  
Oxidation Of Phenol ◽  
And Storage

Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 catalysts were synthesized for the complete oxidation of phenol in liquid-phase under moderate condition. The loading of ZrO2 onto SBA-16 effectively enhanced the catalytic activity of Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 due to the increase of the oxygen release and storage abilities of the CeO2–ZrO2–SnO2 promoter. Among the prepared catalysts with various ZrO2 loading amounts (0–36[Formula: see text]wt.%), the Pt(7[Formula: see text]wt.%)/Ce[Formula: see text]Zr[Formula: see text]Sn[Formula: see text]O2 (16[Formula: see text]wt.%)/ZrO2(24[Formula: see text]wt.%)/SBA-16 exhibited the highest activity, and the complete phenol removal was achieved after the reaction at 80∘C for 8[Formula: see text]h under the atmospheric pressure.

METHYL BROMIDE AND ETHYLENE OXIDE FUMIGATION OFSYNCHYTRIUM ENDOBIOTICUM

1970 ◽  
Vol 50 (6) ◽  
pp. 649-658 ◽  
Author(s):  
H. A. U. MONRO ◽  
C. T. BUCKLAND ◽  
O. A. OLSEN
Keyword(s):  
Ethylene Oxide ◽  
Methyl Bromide ◽  
Atmospheric Pressure ◽  
Potato Wart ◽  
Synchytrium Endobioticum

Methyl bromide (2.5% by volume) and ethylene oxide (2.0% by volume) in vacuum fumigation for 4 hr at 25 C killed all of the resting sporangia of the potato wart fungus, Synchytrium endobioticum (Schilb.) Perc. Methyl bromide was also effective at atmospheric pressure at 4.0% for 4 hr and at 0.25% for 16 hr at 25 C. No advantage was gained by mixing the two gases in any proportions. The use of these fumigants under normal commercial conditions to prevent the spread of the organism in commodities such as jute (burlap) bags is considered feasible.

scholarly journals Experimental investigation of hydrodynamic phenomena in vertical-upward adiabatic two-phase flow conditions

2021 ◽  
Vol 10 (3) ◽  
pp. 49-59
Author(s):  
Dinh Anh Tuan ◽  
Pham Tuan Nam ◽  
Nguyen Tu Oanh
Keyword(s):  
Experimental Investigation ◽  
Atmospheric Pressure ◽  
Two Phase Flow ◽  
Water Velocity ◽  
Phase Flow ◽  
Flow Conditions ◽  
Air Velocity ◽  
Two Phase ◽  
Single Flow ◽  
Flow Experiments

In order to investigate hydrodynamic phenomena in two-phase flow conditions in nuclear safety analysis, a series of two-phase flow experiments were conducted using a single flow channel in which air and water were simultaneously injected into the test section. The experiments under atmospheric pressure conditions were carried out with the water velocity and the air velocity covering the ranges from 0.2 to 1.5 m/s and 0.05 to 0.2 m/s, respectively. The technique of two-sensor conductivity probe was used for the measurement of bubble parameters. The experimental results presented and analyzed in this study are the local time-averaged void fraction and bubble velocities at three axial positions L/D = 14.4, 51.2 and 71.3.

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