How are phase changes taken into account for reactor sizing?
The equations for concentration, in terms of conversion, will change once a phase change begins to occur. Consequently, the expression for the rate law as a function of conversion might have different expressions for different conversion ranges. See example 3-10, p 108. • How do you know whether to use 2 points, 3 points, etc., to calculate an integral and evaluate the area under the curve for sizing a PFR? It depends upon the steepness of the function you want to integrate. The greater the steepness, the larger the number of points you have to use. The quadrature methods are given in section A.4, p 924.
