Kinetic separation of carbon dioxide from hydrocarbons using carbon molecular sieve |
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Affiliation: | 1. Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Søltofts Plads, 2800 Lyngby, Denmark;2. SimSci by Schneider Electric, Houston 77001, TX, United States;1. School of Chemistry Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;3. China ShenHua Coal to Liquid and Chemical Co., Ltd., Beijing 100011, China;1. Medical University Donetsk, Donetsk, Ukraine;2. Institute of Colloid Chemistry and Chemistry of Water, Kyiv (Kiev), Ukraine;3. MPI Colloids and Interfaces, Potsdam, Germany;1. Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads Building 229, DK-2800 Kgs. Lyngby, Denmark |
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Abstract: | Experimental results are reported on a pressure swing adsorption (PSA) process using carbon molecular sieve (CMS) for the separation of a gas mixture containing carbon dioxide, hydrocarbons (methane, ethane, propane, etc.) and nitrogen. This PSA process has direct applications in carbon dioxide removal or purification from landfill gas, natural gas processing plants and tertiary oil recovery effluent streams. The CMS-based PSA process separates the carbon dioxide in a single stage by using the differences in component diffusivities. This approach, therefore, provides a significant advantage compared to conventional equilibrium adsorption processes which require one separation stage for removing components such as ethane and propane that are more strongly adsorbed than carbon dioxide and another separation stage for removing components such as methane and nitrogen that are less strongly adsorbed than carbon dioxide. The CMS-based PSA process operates between a feed pressure of 20 to 40 bars and a regeneration pressure of 1.5 bars at ambient temperature and produces a 98+% carbon dioxide product. The PSA process can be integrated with a liquid carbon dioxide plant to produce food grade product. |
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