Techno-economic analysis of CO₂ cryogenic distillation from high CO₂ content gas field: A case study in Indonesia

Indonesia has natural gas reservoirs with high CO₂ content, such as Natuna and Bojonegoro gas fields. Various technologies have been developed, including cryogenic distillation separation technology suitable for application to gas wells with high CO₂ content. Cryogenic distillation separates CO₂ with high purity according to the operating conditions and the CO₂ dew point. Cryogenic distillation was simulated in this study to determine the purity of the CO₂ and to compare the economic potential of each approach. The highest CO₂ purity using CFZ technology is 98.72% in the Natuna, while the highest purity of CH₄ using Pellegrini Distillation technology is 99.95% in the Bojonegoro. Economically, the Natuna and Bojonegoro estimates using the CFZ technology have a lower total annual cost than the Pelegrini distillation. However, CFZ technology has a lower CO₂ capture cost than Pellegrini Distillation technology, 7.9 USD/tonne CO₂ and 10.26 USD/tonne CO₂. In other words, separation using the CFZ technology is more effective for gas fields with higher CO₂.