Conference article

Water must be removed from carbon dioxide (CO2) after capture because of risk for corrosion and hydrate formation. The level of accepted water content after dehydration depends on the next step for the captured CO2, and can be in the range between 5 and 500 parts per million (ppm) on a volume basis. A water specification of 50 ppm is a traditional specification for pipeline transport. Absorption into triethylene glycol (TEG) followed by desorption is a traditional gas dehydration method, and can also be used for CO2. For very low water content, use of solid adsorbents is expected to be the preferred method. There are very few references in the open literature on simulation of CO2 dehydration. It is in this work demonstrated that it is possible to simulate both a traditional glycol dehydration process and more advanced CO2 dehydration processes using different equilibrium models in the process simulation program Aspen HYSYS. Depending on the water content specification for the captured CO2, different processes modifications have been suggested. It is simulated reasonable process alternatives for CO2 dehydration down to water levels below 5 ppm.

CO2; glycol; dehydration; Aspen HYSYS; simulation