Optimization in Liquid-Vapor Region for Cryogenic based Separation Simulation of Natural Gas Components

Ali Qasim; Bhajan Lal; Muhammad Babar; Abulhassan Ali; Mohamad Azmi Bustam; Azmi Mohd Shariff

Authors

Ali Qasim Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia
Bhajan Lal Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia
Muhammad Babar Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia
Abulhassan Ali Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia
Mohamad Azmi Bustam Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia
Azmi Mohd Shariff Chemical Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750, Malaysia

Keywords:

Liquid-vapor region, natural gas separation, phase behavior, optimization

Abstract

The liquid-vapor (L-V) and solid-vapor (S-V) domains of the natural gas mixture with high CO2 content and heavier hydrocarbons up to pentane for cryogenic separation have been obtained through simulation. The simulations are performed using Aspen HYSYS. The pressure-temperature phase diagram is generated for selected gaseous mixtures and the phase boundaries of both liquid-vapor region and solid-vapor region are identified. Optimized pressure and temperature conditions in liquid-vapor region have been found using response surface methodology through Design-Expert software. For gas mixture 1, the first set of condition from two set of optimized conditions for pressure and temperature is 38.04 bar and 0 °C while the second set of condition constitutes of 9.92 bar and -30 °C. The optimum pressure and temperature conditions for gas mixture 2 are 38.67 bar, 0 °C and 6.95 bar, -30 °C.