Contact Separation of a Binary Mixture

Finally, let us discuss how the layer depth H influences the efficiency of separation. Since t the characteristic relaxation time is inversely proportional to the layer depth. It means that for the same volume of the mixture, equilibrium will establish faster if we spread the mixture in a thicker layer teq will be smaller for the layer of thickness Hi than for the layer of thickness H2, where Hi Hj). But it is necessary to remember that we cannot set the layer depth to be arbitrarily large, as this can violate the assumption that the time it takes for a bubble to reach the surface is shorter than the characteristic relaxation time. 

For the intensity of bubble formation we will use, as before, the expression (23.17). 

Then the system of equations describing the process of contact degassing becomes  

Shown in Figs. 23.3 and 23.4 are some results of numerical solution of Eqs. (23.27) change in time of separation efficiency for various values of parameter G describing the ratio of liquid-gas-cap volumes, and dependence of equilibrium pressure in the gas cap on parameters Ki and G. Separation efficiency of contact degassing is lower than that of differential degassing. The heavier the dissolved component (i.e. the smaller the parameter JCi), the greater is this difference. 

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