superneatea-steam distillation is an important unit operation of cnemical engineering for separating heavy turpentine and rosin. Analyses of the operation of binary mixture superheated-steam distillation of heavy turpentine in the stripping column have been made by means of vapor-liquid equilibrium relation, material balance and heat balance. A method and a computer program for the calculation of the operation have also been worked out. The method can also be used in other similar separate processes.