Abstract
The performance of the differential contacting distillation column with external heating or cooling was analyzed for four simple cases with the assumption that either mass transfer coefficient or H.T.U. is constant. The numerical evaluation as the ratio of N.T.U.s of the columns with and without heat exchange shows obviously that such heating or cooling in the differential contacting column has a quite different effect upon column performance from that in the plate column. It has been also pointed out that whether improvement or deterioration of column performance results from heating or cooling is likely to depend on the value of reflux ratio.
For total reflux operation, the analysis gives simple equations to predict N.T.U. under heating or cooling conditions.
