NETZSCH - Leading Thermal Analysis.   
    
 
 

Component kinetics

 
The Program is the software module for the kinetic evaluation of measurements with reactions in homogeneous mixtures. The total process is presented as the sum of elementary reactions. The software determines the pre-exponential factor and activation energy for each elementary reaction and makes the prediction and optimization of the reaction behaviour for any temperature conditions and for any initial concentration of reactants, including the presence of solvent.
 
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Example 1
Simulated reaction of 2nd order of the type A + B -> C

Parameter log A/(s-1 l mol-1) = 5, EA = 50 kJ mol-1, Qr = - 37 kJ mol-1
Molar masses / g mol-1 A = 100, B = 50, C = 150
Densities / g ml-1 A = 1, B = 1.5, C = 2, Solvent = 1.25
Heating rates / K min-1 0.5 , 1, 2, 5, 10
Concentration relationship A : B 1:5, 1:4, 1:3, 1:2, 1:1, 5:32, 9:1

Characteristics:
  • extreme variation of the relationship of the starting concentrations of A and B
  • presence of strongly different solvent quantities, strongly different densities.
  • perfect adjustment to the simulated curves
  • model parameters are practically identical to the defaults:
    lg A = 5.001 s-1(l/mol),
    EA = 50 kJ mol-1,
    Qr = -36.97 kJ mol-1
Examination of the calculated concentration profile for curve (b = 1K mi-1); based on the initial values (first column) the final concentrations should correspond to those from the last column.

Start amount of substance Final amount of substance Final mass Final Volume Final concentration
nA,0: 5 mol nA,f: 3 mol mA,f: 300 g VA: 300 ml cA,f: 3.3962 mol l-1
nB,0: 2 mol nB,f: 0 mol mB,f: 0 g VB: 0 ml CB,f: 0 mol l-1
nC,0: 0 mol nC,f: 2 mol mC,f: 300 g VC: 150 ml cC,f: 2.2642 mol l-1
VSolvent: 433.33 ml
Vtotal: 883.33 ml
  • The final concentrations for A and C (dashed lines) correspond exactly to the calculate values
  • The volume change during reaction is taken into account correctly

Other application examples


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