Review of metallurgical physical chemistry -- rate equations of complex reactions

 

The above reaction is the simplest series reaction

Net generation = Total generation minus total disappearance

                       Parallel reaction is also called parallel reaction    , Parallel reactions are also divided into main reactions and side reactions       Both reactions are consumed A, So the total consumption rate is the sum of the consumption rates of the two reactions                                  The instantaneous concentration is equal to Cao  - x ---- Only x It's a variable. , therefore d(C instantaneous ) = dx 

The rate of the total reaction is equal to the difference between the two reaction rates of the positive reaction and the reverse reaction        here xe It means when the reaction reaches equilibrium a Amount consumed                                                The reaction proceeds to ts Time time , Generate B Speed and consumption B At the same rate , That is to say, this moment B The change rate of is 0                                                     Make the K2 Far greater than K1 If so, we can get the result obtained by using the steady-state principle on the left  

The total reaction rate is determined by the reaction with the slowest reaction rate

 

 

 

 K Is the equilibrium constant of chemical reaction , This K And the reaction rate constant

 

  Only after overcoming the energy peak can the reaction be carried out

 

  Hanging tower H Less than 0 It's exothermic , Greater than 0 Is endothermic