Calculating and Applying K-Values

Calculating and Applying K-Values Page 1 of 15. Calculating and Applying K-Values By Abdulreda Al-Saygh and Mahmood Moshfeghian Department of Chemical Engineering University of Qatar, Doha, Qatar And Robert N. Maddox School of Chemical Engineering Oklahoma State University Stillwater, Oklahoma, ABSTRACT. Several methods for determination of K-Values were reviewed and sample results are presented. Several case studies were presented to demonstrate their application. Based on the VLE calculations results, for light hydrocarbon systems, an equation of state should be used and for polar systems, an activity coefficient model is recommended. Introduction Modeling and design of many types of equipment for separating gas and liquids such as flash separators at the well head, distillation columns and even a pipeline are based on the phases present being in vapor -liquid equilibrium. The criteria for thermodynamic equilibrium between vapor and liquid phases are equality of temperature in both phases, equality of pressure in both phases, and equality of fugacity of each component in both phases.

The vapor pressure may be read from a Cox chart or calculated from a suitable equation in terms of temperature. A typical Cox chart can be found in reference [8]. The Antoine [5] equation is recommended for calculating vapor pressure. Complex vapor pressure equations presented by Wagner [5], even though more accurate, should be

Loading..

Tags:

  Pressure, Vapor, Antoine, Vapor pressure

Information