832. The conductometric determination of basic dissociation constants of weak bases in sulphuric acid. Part I. The basicities of substituted nitrobenzenes

1962 ◽  
pp. 4272 ◽  
Author(s):  
M. Liler
Keyword(s):  
Sulphuric Acid ◽  
Dissociation Constants ◽  
Weak Bases ◽  
Basic Dissociation

Dissociation constants of monosubstituted diphenylamines and an optimized construction of acidity function

1983 ◽  
Vol 48 (8) ◽  
pp. 2368-2375 ◽  
Author(s):  
Oldřich Pytela ◽  
Pavel Vetešník
Keyword(s):  
Free Energy ◽  
Sulphuric Acid ◽  
Concentration Ratio ◽  
Dissociation Constants ◽  
Acidity Function ◽  
Linear Free Energy Relationships ◽  
Linear Free Energy ◽  
Energy Relationships ◽  
Sulphuric Acid Concentration

Eleven monosubstituted diphenylamines have been synthetized, and concentration ratio of the protonated and free bases has been measured in aqueous sulphuric acid in the concentration range 1.0 . 10-3 to 9.0 mol l-1. An algorithm has been suggested and used for determination of optimized values of pK and H'' acidity function within sulphuric acid concentration range 0.05 to 9.0 mol l-1. The results have been compared with literature data and discussed in terms of theory of acidity functions and linear free energy relationships.

Determination of acidic dissociation constants of L-phenylalanyl-glycine and L-alanyl-L-alanine in water using ab initio methods

2014 ◽  
Vol 2 (42) ◽  
pp. 263-263
Author(s):  
Farhoush Kiani ◽  
Mahmoud Tajbakhsh ◽  
Fereydoon Ashrafi ◽  
Nesa Shafiei ◽  
Azar Bahadori ◽  
...  
Keyword(s):  
Ab Initio ◽  
Dissociation Constants ◽  
Ab Initio Methods ◽  
Acidic Dissociation

scholarly journals Modelling and Multi-Objective Optimization of the Sulphur Dioxide Oxidation Process

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1072
Author(s):  
Mohammad Reza Zaker ◽  
Clémence Fauteux-Lefebvre ◽  
Jules Thibault
Keyword(s):  
Sulphuric Acid ◽  
Sulphur Dioxide ◽  
Variable Number ◽  
Inlet Temperature ◽  
Multi Objective Optimization ◽  
Absorption Column ◽  
Maximum Reaction Rate ◽  
Multi Objective ◽  
Maximum Reaction

Sulphuric acid (H2SO4) is one of the most produced chemicals in the world. The critical step of the sulphuric acid production is the oxidation of sulphur dioxide (SO2) to sulphur trioxide (SO3) which takes place in a multi catalytic bed reactor. In this study, a representative kinetic rate equation was rigorously selected to develop a mathematical model to perform the multi-objective optimization (MOO) of the reactor. The objectives of the MOO were the SO2 conversion, SO3 productivity, and catalyst weight, whereas the decisions variables were the inlet temperature and the length of each catalytic bed. MOO studies were performed for various design scenarios involving a variable number of catalytic beds and different reactor configurations. The MOO process was mainly comprised of two steps: (1) the determination of Pareto domain via the determination a large number of non-dominated solutions, and (2) the ranking of the Pareto-optimal solutions based on preferences of a decision maker. Results show that a reactor comprised of four catalytic beds with an intermediate absorption column provides higher SO2 conversion, marginally superior to four catalytic beds without an intermediate SO3 absorption column. Both scenarios are close to the ideal optimum, where the reactor temperature would be adjusted to always be at the maximum reaction rate. Results clearly highlight the compromise existing between conversion, productivity and catalyst weight.

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