Phenomenological kinetics of wood delignification: application of a time-dependent rate constant and a generalized severity parameter to pulping and correlation of pulp properties

1994 ◽  
Vol 28 (6) ◽  
Author(s):  
D. Montan� ◽  
J. Salvad� ◽  
X. Farriol ◽  
P. Jollez ◽  
E. Chornet
Keyword(s):  
Rate Constant ◽  
Time Dependent ◽  
Dependent Rate ◽  
Pulp Properties ◽  
Kinetics Of ◽  
Severity Parameter

A new time-dependent rate constant of the coalescence kernel for the modelling of fluidised bed granulation

2021 ◽  
Vol 379 ◽  
pp. 321-334
Author(s):  
Kevin Cronin ◽  
Francisco J. Gutiérrez Ortiz ◽  
Denis Ring ◽  
Fuweng Zhang
Keyword(s):  
Rate Constant ◽  
Time Dependent ◽  
Fluidised Bed ◽  
Dependent Rate ◽  
New Time

Kinetics of the anation reaction of nickel(II) and 1,10-phenanthroline in methanol–water mixtures

1969 ◽  
Vol 47 (20) ◽  
pp. 3773-3778 ◽  
Author(s):  
M. L. Sanduja ◽  
W. MacF. Smith
Keyword(s):  
Ionic Strength ◽  
Rate Constant ◽  
Rate Constants ◽  
Solvent Composition ◽  
Solvent Mixtures ◽  
Methanol Content ◽  
Dependent Rate ◽  
Kinetics Of Formation ◽  
Kinetics Of ◽  
Anation Reaction

The kinetics of formation of the monophenanthroline complex of nickel(II) has been studied spectrophotometrically in water–methanol mixtures of 0 to 97 weight % of methanol, at ionic strength 0.050, at varying acidities at 25 °C. Values for the rate constants for the acid independent and acid dependent reactions together with values for the equilibrium acid ionization quotient of phenanthrolium ion over the range of solvent mixtures have been determined. The values of the acid independent rate constant show little dependence on solvent compositions up to 76% methanol, then decrease and show no correlation with trends in the ionization quotient of phenanthrolium ion. The acid dependent rate constant shows only a modest dependence on solvent composition over most of the range of solvent compositions except in the range of highest methanol content where it is not significantly different from zero.

scholarly journals The equilibrium assumption is valid for the kinetic treatment of most time-dependent protein-modification reactions

1979 ◽  
Vol 181 (3) ◽  
pp. 775-778 ◽  
Author(s):  
K Brocklehurst
Keyword(s):  
Rate Constant ◽  
Protein Modification ◽  
Order Rate Constant ◽  
Time Dependent ◽  
Quasi Equilibrium ◽  
Dependent Inhibition ◽  
Dependent Protein ◽  
Time Dependent Inhibition ◽  
Kinetics Of ◽  
Kinetic Treatment

To facilitate mechanistic interpretation of the kinetics of time-dependent inhibition of enzymes and of similar protein modification reactions, it is important to know when the equilibrium assumption may be applied to the model: formula: (see text). The conventional criterion of quasi-equilibrium, k + 2 less than k-1, is not always easy to assess, particularly when k + 2 cannot be separately determined. It is demonstrated that the condition k + 2 less than k-1 is necessarily true, however, when the value of the apparent second-order rate constant for the modification reaction is much smaller than the value of k + 1. Since k + 1 is commonly at least 10(7)M-1.S-1 for substrates, it is probable that the equilibrium assumption may be properly applied to most irreversible inhibitions and modification reactions.

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