In the process of CO2 separation from natural gas, research has been done by various parties. Even though they were successful to a certain extent, a far more clear and optimized process is being searched for. In this study, simulation software is used to replicate experimental data. Supersonic nozzles are used, as there is a reduction in the pressure and temperature of the gas when it flows through a converging�diverging nozzle, and the condensation process can take place. The aim of this study is to find a set of parameters that can be used to achieve a higher efficiency in CO2 condensation. At the conclusion of this study, a sharp pressure drop, of more than 50, is observed when using lamina flows for both Ideal and Peng-Robinson CO2. When the K-Epsilon turbulence model is used, the pressure drop is only 25. CFD simulations were conducted on ANSYS CFX. Past literature has shown how achievable the partial condensation of both natural gas mixtures containing CO2 and pure CO2 is. © Institute of Technology PETRONAS Sdn Bhd (Universiti Teknologi PETRONAS) 2024.