Instrumentation & Control In Distilation Coloumn
INTRODUCTION : Distillation is the most common class of separation processes and one of the better understood unit operations. It is an energy-separating-agent equilibrium process that uses the difference in relative volatility, or differences in boiling points, of the components to be separated. It is the most widely used method of separation in the process industries. The distillation process will most often be the choice of separation unless the following conditions exist: • Thermal damage can occur to the product. • A separation factor is too close to unity. • Extreme conditions of temperature or pressure are needed. • Economic value of products is low relative to energy costs. Control involves the manipulation of the material and energy balances in the distillation equipment to affect product composition and purity. Difficulties arise because of the multitude of potential variable interactions and ...