scholarly journals Effect of solvent on the kinetics of the hydration of 2-methylpropene catalyzed by strong acid ion exchangers

1989 ◽  
Vol 54 (2) ◽  
pp. 183-197 ◽  
Author(s):  
J. Meuldijk ◽  
G.E.H. Joosten ◽  
E.J. Stamhuis ◽  
A.A.C.M. Beenackers
Keyword(s):  
Strong Acid ◽  
Ion Exchangers ◽  
Effect Of Solvent ◽  
Kinetics Of

Polymer structure and catalytic activity of ion exchangers

1981 ◽  
Vol 46 (7) ◽  
pp. 1577-1587 ◽  
Author(s):  
Karel Jeřábek
Keyword(s):  
Catalytic Activity ◽  
Ethyl Acetate ◽  
Active Sites ◽  
Crosslinking Agent ◽  
Reaction Medium ◽  
Polymer Structure ◽  
Local Concentration ◽  
Ion Exchangers ◽  
Styrene Divinylbenzene ◽  
Kinetics Of

Catalytic activity of ion exchangers prepared by partial sulphonation of styrene-divinylbenzene copolymers in reesterifications of ethyl acetate by methanol and propanol, hydrolysis of ethyl acetate and in synthesis of bisphenol A has been compared with data on polymer structure of these catalysts and with distribution of the crosslinking agent, divinylbenzene, calculated from literature data on kinetics of copolymerisation of styrene with divinylbenzene. It was found that the polymer structure of ion exchangers influences catalytic activity predominantly by changing the local concentration of acid active sites. The results obtained indicated that the effect of transport phenomena on the rate of catalytic reactions does not depend on the degree of swelling of the ion exchangers in reaction medium but it is mainly dependent on the relative affinity of reaction components to the acid groups or to the polymer skeleton.

The Effect of Solvent on the Acid-Base Kinetics of the Excited State of β-Naphthol1

1965 ◽  
Vol 69 (6) ◽  
pp. 2044-2059 ◽  
Author(s):  
Norman M. Trieff ◽  
Benson R. Sundheim
Keyword(s):  
Excited State ◽  
Acid Base ◽  
Effect Of Solvent ◽  
Kinetics Of

scholarly journals Adsorption Equilibrium, Kinetics, Thermodynamics and Dynamic Separation of Magnesium and CalciumIons from Industrial Wastewater by New Strong Acid Cation Resin of SPVC

2021 ◽  
Vol 22 (1) ◽  
pp. 127-138
Author(s):  
Dilfuza Nuriddinova
Keyword(s):  
Calcium Ions ◽  
Industrial Wastewater ◽  
Adsorption Equilibrium ◽  
Dynamic Condition ◽  
Research Work ◽  
Strong Acid ◽  
Cation Resin ◽  
Acid Cation ◽  
Kinetics Of ◽  
Separation Results

In the research work, the adsorption equilibrium, kinetics, thermodynamics and dynamic separation of magnesium and calcium ions from industrial wastewater by new strong acid cation resin of SPVC (sulphonated polyvinylchloride) were investigated. The sorption capacity of the studied resin was 3.78 mmol/g and 3.74 mmol/g for magnesium and calcium ions, respectively, according to Langmuir isotherm. It was found that the pseudo−first−order model was better fitted for the adsorption kinetics of magnesium and calcium ions on the resin. The dynamic separation results confirmed that the selected resin effectively separated magnesium and calcium ions from industrial wastewater in the dynamic condition. The change of the standard Gibbs free energy (G) and enthalpy (H), and entropy (S) were calculated. The obtained results confirmed that the adsorption of magnesium and calcium ions on the selected resin is endothermic.

Effect of solvent nature on the photoreduction kinetics of substituted benzoquinones

2016 ◽  
Vol 50 (3) ◽  
pp. 196-200 ◽  
Author(s):  
M. P. Shurygina ◽  
S. A. Chesnokov ◽  
G. A. Abakumov
Keyword(s):  
Solvent Nature ◽  
Effect Of Solvent ◽  
Kinetics Of

ChemInform Abstract: THE KINETICS OF IONIC/METALLIC ION EXCHANGERS

1975 ◽  
Vol 6 (39) ◽  
pp. no-no
Author(s):  
D. A. OKONGWU ◽  
W. K. LU
Keyword(s):  
Ion Exchangers ◽  
Kinetics Of

Etude cinétique des systèmes Cu(II)•Adénosine et Cu(II)•D-Ribose

1972 ◽  
Vol 50 (19) ◽  
pp. 3117-3123 ◽  
Author(s):  
G. Boivin ◽  
M. Zador
Keyword(s):  
Kinetic Parameters ◽  
Acidic Medium ◽  
Temperature Jump ◽  
Strong Acid ◽  
Basic Medium ◽  
Stopped Flow ◽  
Acid Solutions ◽  
Flow Method ◽  
Kinetics Of ◽  
Adenine Base

The kinetics of the formation and dissociation of Cu(II) complexes of adenosine have been determined in acidic and basic medium. In acidic medium, the complex is formed between the Cu(II) and the adenine base and the kinetic parameters have been obtained in this case using a temperature jump method. In basic medium, only the dissociation of the complexes could be studied by a stopped-flow method, by addition of EDTA or strong acid solutions. In these complexes, Cu(II) is bridged with ribose hydroxyls. Finally, D-ribose has also been studied for comparison in the same conditions. The mechanism of these reactions is discussed.

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