PROCESS AND APPARATUS FOR CONTROLLING THE COMPOSITION OF A MIXTURE LEAVING AN EVAPORATOR

摘要

PROCESS AND APPARATUS FOR CONTROLLING THE COMPOSITION OF A MIXTURE LEAVING AN EVAPORATOR The composition of the final mixture leaving a two-stage evaporator is controlled by measuring the boiling temperature of the intermediate liquid mixture which leaves the first-stage and which is in equilibrium with the vapor stream leaving the first-stage. From this boiling temperature, the concentration of the less volatile component is calculated, and this calculated concentration is used to adjust the heat input to the second stage in order to produce a final product having a predetermined composition.