Analysis and Control of Distillation Columns
نویسنده
چکیده
Here MI is the total holdup inside the column, and MD and MB are the condenser and reboiler holdups. S = yD(1 xB) (1 yD)xB is the separation factor and Is = DyD(1 yD) + BxB(1 xB) is the \impurity sum". Note that Is may be extremely small for columns with both products of high purity (1 yD and xB both small) resulting in very large linearized values of 1. The response to changes in the internal ows (keep D and B constant) is also rst order, but its time constant 2 is generally signi cantly smaller than 1. It can be estimated by matching the initial response.
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