MERSHQ equations

The 6c + 8 equations for the jth stage, collectively referred to as the MERSHQ equations (after the letters used to identify the different equations), are... 

It should be stated that the number of equations in this approach is very large, and specialized computer programs have been developed far their solution. Our objective here is very limited, namely to provide an idea of the basis of these equations. The basic set of equations in such rate based or nonequilibrium models of a distillation plate/ stage is sometimes referred to as the MERSHQ equations (Taylor et id., 2003), with each letter representing equations for a particular aspect of the problem for any plate n of the n-component system. 

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