Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering and Chemistry

First Advisor

John E. McCormick

Second Advisor

Edward Charles Roche, Jr.

Third Advisor

Jerome J. Salamone


This thesis presents a Fortran Computer Program to solve binary distillation problems. The solution is obtained by the method of Pochon-Savarit which is based upon graphical use of an enthalpy-concentration diagram. The enthalpy data in this program is calculated using Lagrange interpolation. This is accomplished by utilizing the Lagrange interpolation to get values for the enthalpy of the vapor until we find that value which lies on the same line as the enthalpy of the liquid from the preceding tray and its corresponding del point.

The required input data consist of liquid-vapor equilibrium data, heat of solution data with the reference temperature, the feed rate and temperature, the weight fraction of the lighter component in the feed, distillate, and bottoms, and the reflux ratio. In addition, for each component, the molecular weight, heat of vaporization, critical temperature, boiling point and specific heat of the liquid and vapor must be specified. The specific heats must be in terms of a third order polynomial with respect to temperature. The program output includes the mole fraction, quantity, and enthalpy of the feed, distillate, and bottoms, the condenser and re-boiler heat loads, the feed tray location, the number of ideal trays, and the mole fraction and enthalpy of the vapor and the liquid at each tray. This program enables as many sets of data to be run within one execution of the program as desired by the user.



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