Modelling a Continuous Stirred Tank Reactor CSTR

11 Modelling a Continuous Stirred Tank Reactor (CSTR) 

The analysis of the CSTR parallels closely that of the gas reactor, although differences arise from the fact that the reaction fluid is now a liquid. We shall need to allow for changes in the volume of the reaction fluid, and this will have effects on both the work done by the bulk volume and on the hydrostatic pressure. 

We shall assume that we have been given the temperatures of the inlet streams, T and Ty and the mass fractions, ixxi and nr,. The specific volume of each inlet stream will need to be calculated from the mass fractions. The simplest calculation follows Amagat s Law, which states that any liquid volume, V, is equal to the sum of the kmol masses, M,, multiplied by the specific volumes, Vi, in m /kmol  

The overall specific volume is found by dividing by the mass in kg, m  

allowing for the change in each component specific volume with temperature, we have  

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