Abstract
Carbon dioxide (CO 2) removal is an essential step in natural gas (NG) processing to provide high quality gas stream products and minimize operational difficulties. This preliminary study aims to investigate the removal of CO 2 at high concentration level from the mixture of CO 2-NG gas stream at elevated pressure via absorption process. This is to explore the possibility of exploring high CO 2 content natural gas reserves by treatment at offshore platform. A mixed amine solvent, Stonvent-II, was used for the absorption of approximately 75 vol% CO 2 in CO 2-NG stream at a pressure of 10 barg. The initial solvent temperature was varied in order to study the impact of initial temperature on the absorption performance. Preliminary study at temperatures of 35°C and 45°C indicates that Stonvent-II was able to perform almost 100% removal of CO 2 under both conditions. However, the CO 2 absorption effect took place faster when the initial liquid temperature was lower. This is because when the initial liquid temperature is high, the temperature increase in the packing bed caused by the reaction heat is high which impacts the efficiency of absorption negatively.
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