Halogenation of acetone. A method for determining pKas of ketones in aqueous solution, with an examination of the thermodynamics and kinetics of alkaline halogenation and a discussion of the best value for the rate constant for a diffusion-controlled reaction. Energetic requirements for a diffusion-controlled reaction involving heavy-atom bond formation

1984 ◽  
Vol 106 (5) ◽  
pp. 1351-1360 ◽  
Author(s):  
J. Peter Guthrie ◽  
John Cossar ◽  
Alex Klym
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Bond Formation ◽  
Heavy Atom ◽  
Thermodynamics And Kinetics ◽  
Best Value ◽  
Diffusion Controlled ◽  
Kinetics Of ◽  
Atom Bond ◽  
Diffusion Controlled Reaction

scholarly journals EFFECT OF DIATOMEAOUS EARTH TREATMENT USING HYDROGEN CHLORIDE AND SULFURIC ACID ON KINETICS OF CADMIUM(II) ADSORPTION

2010 ◽  
Vol 2 (2) ◽  
pp. 107-112
Author(s):  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Hydrogen Chloride ◽  
Rate Constant ◽  
Diatomaceous Earth ◽  
Adsorption Rate ◽  
Physical Interaction ◽  
First Order ◽  
Adsorption Rate Constant ◽  
Kinetics Of

In this research, treatment of diatomaceous earth, Sangiran, Central Java using hydrogen chloride (HCl) and sulfuric acid (H2SO4) on kinetics of Cd(II) adsorption in aqueous solution has been carried out. The work was conducted by mixing an amount of grounded diatomaceous earth (200 mesh in size) with HCl or H2SO4 solution in various concentrations for two hours at temperature range of 100 - 150oC. The mixture was then filtered and washed with water until the filtrate pH is approximately 7 and then the residue was dried for four hours at a temperature of 70oC. The product was used as an adsorbent to adsorb Cd(II) in aqueous solution with various concentrations. The Cd(II) adsorbed was determined by analyzing the rest of Cd(II) in the solution using atomic absorption spectrophotometry. The effect of treatment was evaluated from kinetic parameter of adsorption rate constant calculated based on the simple kinetic model. Results showed  that before equilibrium condition reached, adsorpstion of Cd(II) occurred through two steps, i.e. a step tends to follow a reaction of irreversible first order  (step I) followed by reaction of reversible first order (step II). Treatment with acids, either hydrogen chloride or sulfuric acid, decreased adsorption rate constant for the step I from 15.2/min to a range of 6.4 - 9.4/min.  However, increasing concentration of acid (in a range of concentration investigated) did not give significant and constant change of adsorption rate constant. For step II process,  adsorption involved physical interaction with the sufficient low adsorption energy (in a range of 311.3 - 1001 J/mol).     Keywords: adsorption, cdmium, diatomaceous earth, kinetics.

scholarly journals Thermodynamics and kinetics of the removal of methylene blue from aqueous solution by raw kaolin

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Achraf Harrou ◽  
Elkhadir Gharibi ◽  
Hicham Nasri ◽  
Meriam El Ouahabi
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of

scholarly journals Modeling of Hg (II) Adsorption onto Ca-bentonite

2018 ◽  
Vol 62 (2) ◽  
Author(s):  
Erika Bustos ◽  
Irma Robles ◽  
Yamir Bandala ◽  
Juan Manríquez
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Organic Matter ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of

<p>The presence of mercury in soils, like other heavy metals, is associated with organic matter and minerals. Mercury deposited in soils is mainly in its oxidized form Hg2+. The adsorption of Hg (II) from aqueous solution into Ca-bentonite was studied. Adsorption percentage was determined as a function of shaking time and temperature to study the thermodynamics and kinetics of Hg (II) adsorption on Ca-bentonite, which was simulated using the MINSQ and GAUSSIAN 09 programs.</p>

Kinetics of Reactive Extraction of Pyruvic Acid Using Tributylamine Dissolved in n-Butyl Acetate

2015 ◽  
Vol 13 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Dharm Pal ◽  
Amit Keshav
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Pyruvic Acid ◽  
Butyl Acetate ◽  
Volume Ratio ◽  
Kinetic Studies ◽  
Extraction Process ◽  
Reactive Extraction ◽  
Kinetic Measurements ◽  
Kinetics Of

Abstract Studies have been made on the kinetics accompanied with mass transfer for the pyruvic acid/tributylamine (TBA)/n-butyl acetate system to investigate the effectiveness of reactive extraction for the separation of pyruvic acid from the aqueous solution. In the present work, kinetic studies, needed for the design of a recovery unit, were carried out using aqueous solution of pyruvic acid. TBA (conc. range 0.420–2.099 kmol/m3) dissolved in n-butyl acetate (conc. range 50–90%) was used as an extractant. The effect of reactant concentration, the effect of stirring speed and the effect of phase volume ratio on the extraction process were investigated. The kinetic parameters such as reaction order and rate constant were calculated. Kinetic measurements showed that the reaction is of second order occurring in the diffusion film and was found to be independent of hydrodynamic conditions. Rate constant was evaluated to be $0.419\,{{\rm{m}}^3}{\rm{mo}}{{\rm{l}}^{- 1}}{{\rm{S}}^{- 1}}$ .

The Thermodynamics and Kinetics of CO2 and H+ Binding to Ni(cyclam)+ in Aqueous Solution

1995 ◽  
Vol 117 (17) ◽  
pp. 4911-4919 ◽  
Author(s):  
Craig A. Kelly ◽  
Quinto G. Mulazzani ◽  
Margherita Venturi ◽  
Elliott L. Blinn ◽  
Michael A. J. Rodgers
Keyword(s):  
Aqueous Solution ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of
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