modeling, simulation and optimization of refinery crude atmospheric and vacuum distillation unit

crude oil is first processed by the desalter to remove salts, solids and water. the desalted crude oil is then separated into intermediate petroleum such as naphtha, kerosene, gasoil and atmospheric residue by the atmospheric distillation unit. the whole or a part of the atmospheric residue is usually separated further into vacuum gasoil and vacuum residue by vacuum distillation. tighter environment regulations, higher energy costs and growing competition have increased the drive for making distillation system more efficient. complex columns offer a great opportunity for improving efficiency by using them instead of a series of simple columns. different aspects of crude distillation unit have been considered in this study and effect of various operating and design conditions on yield and quality of products monitored.