High Pressure Supercritical Carbon Dioxide Separation from its Mixture with Nitrogen at Different Temperatures

Abstract:

Carbon dioxide (CO₂) capturing from point sources is currently being proposed as a way to minimize CO₂ emissions to the atmosphere. Carbon dioxide is considered one of the greenhouse gases that affects our environment. Legislations are being enforced in many countries to limit CO₂ emissions to the atmosphere. Two methods are mostly used for CO₂ capturing from flue gases and natural gases; the first method is absorption using amine-based solvents, while the second is membrane separation. The first method is effective for CO₂ separation from gas mixtures with low CO₂ concentration in the range of 10 to 20%, while the other can handle gas mixture with intermediate CO₂ concentration but there is a limit on the CO₂ purity. Hence, such methods cannot be used in pre-combustion and oxy fuel technologies where a more concentrated CO₂ gas stream is produced. Throughout this work, a new method is introduced to separate carbon dioxide from its mixture with nitrogen (N₂) at high concentrations, 90 mol.% CO₂ and 10 mol.% N₂ gas mixture. A customized high-pressure experimental set-up was built. Three temperature were tested: 15 °C, 25 °C and 38 °C at 150 bar. At such condition CO₂ will be in the liquid and the supercritical phase respectively. The composition of the top and bottom streams where analyzed. The amount of CO₂ in the top stream was the smallest at the supercritical condition. In addition, the purity of CO₂ in the bottom stream was the highest at 38 °C and 150 bars, when CO₂ is at the supercritical phase.

• Periodical: Materials Science Forum (Volume 1008)
• Pages: 1-14
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1008.1
• Online since: August 2020
• Authors: Rehab M. El-Maghraby*, Mahmoud Ramzy, Ahmed K. Aboul-Gheit
• Keywords: Carbon Dioxide Capturing, N₂/CO₂ Gas Mixture, Oxy-Fuel, Pre-Combustion Gases, Supercritical Phase

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