Effect of pressure on the hydrolysis of methyl acetate and ethylene oxide in acetone + water mixtures: quantities of activation at constant volume, and the isokinetic pressure

1965 ◽  
Vol 61 ◽  
pp. 517 ◽  
Author(s):  
B. T. Baliga ◽  
R. J. Withey ◽  
D. Poulton ◽  
E. Whalley
Keyword(s):  
Ethylene Oxide ◽  
Methyl Acetate ◽  
Constant Volume ◽  
Effect Of Pressure ◽  
Acetone Water ◽  
Hydrolysis Of

Effect of Pressure on the Alkaline Hydrolysis of Ethyl Acetate in Acetone–Water Solutions. Parameters of Activation at Constant Volume

1975 ◽  
Vol 53 (22) ◽  
pp. 3414-3418 ◽  
Author(s):  
M. L. Tonnet ◽  
E. Whalley
Keyword(s):  
Ethyl Acetate ◽  
Solvent Effect ◽  
Internal Energy ◽  
Alkaline Hydrolysis ◽  
Constant Pressure ◽  
Constant Volume ◽  
Acetone Water ◽  
Entropy Of Activation ◽  
Enthalpy And Entropy ◽  
Hydrolysis Of

The effect of pressures up to 3 kbar on the rate of the base-catalyzed hydrolysis of ethyl acetate in acetone–water mixtures has been measured. From these measurements and the enthalpy and entropy of activation at constant pressure measured by others, the internal energy and entropy of activation at constant volume have been obtained as a function of solvent composition. The constant-volume parameters of activation vary with composition in a simpler way than the constant-pressure parameters. It seems likely that theoretical discussions of the solvent effect are easier if they are based on the constant-volume parameters. At low acetone concentrations, the addition of acetone reduces the rate constant at low pressure, but increases it at 3 kbar.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

Effect of pressure on the α-amylase catalyzed hydrolysis of starch

1964 ◽  
Vol 6 (4) ◽  
pp. 469-471 ◽  
Author(s):  
Richard G. Griskey ◽  
Thomas Richter
Keyword(s):  
Effect Of Pressure ◽  
Hydrolysis Of

Effect of Pressure on the Hydrolysis of the Ethyleneiminium Ion

1965 ◽  
Vol 69 (5) ◽  
pp. 1751-1753 ◽  
Author(s):  
B. T. Baliga ◽  
A. K. Rantamaa ◽  
E. Whalley
Keyword(s):  
Effect Of Pressure ◽  
Hydrolysis Of

THE CHEMISTRY OF ETHYLENE OXIDE: V. THE REACTION OF ETHYLENE OXIDE WITH HALIDE IONS IN NEUTRAL AND ACID SOLUTION

1952 ◽  
Vol 30 (3) ◽  
pp. 169-176 ◽  
Author(s):  
A. M. Eastham ◽  
G. A. Latremouille
Keyword(s):  
Aqueous Solution ◽  
Ethylene Oxide ◽  
Acid Solution ◽  
Activation Energies ◽  
Hydrogen Halide ◽  
Halide Ions ◽  
Neutral Aqueous Solution ◽  
Rate Of Hydrolysis ◽  
Acid Catalyzed ◽  
Hydrolysis Of

The rates of reaction of halide ions with ethylene oxide in neutral aqueous solution and the rate of hydrolysis of ethylene oxide in acid solution have been measured and the activation energies determined. From these data and from the ratio of glycol to chlorohydrin formed when ethylene oxide reacts with excess aqueous hydrogen halide, the rates of the acid-catalyzed addition of halide ions to ethylene oxide at 25 °C. have been estimated.

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