title: Performance of an electrothermal swing adsorption system with postdesorption liquefaction for organic gas capture and recovery.
abstract: The use of adsorption on activated carbon fiber cloth (ACFC) followed by electrothermal swing adsorption (ESA) and postdesorption pressure and temperature control allows organic gases with boiling points below 0 °C to be captured from air streams and recovered as liquids. This technology has the potential to be a more sustainable abatement technique when compared to thermal oxidation. In this paper, we determine the process performance and energy requirements of a gas recovery system (GRS) using ACFC-ESA for three adsorbates with relative pressures between 8.3 × 10(-5) and 3.4 × 10(-3) and boiling points as low as -26.3 °C. The GRS is able to capture > 99% of the organic gas from the feed air stream, which is comparable to destruction efficiencies for thermal oxidizers. The energy used per liquid mole recovered ranges from 920 to 52,000 kJ/mol and is a function of relative pressure of the adsorbate in the feed gas. Quantifying the performance of the bench-scale gas recovery system in terms of its ability to remove organic gases from the adsorption stream and the energy required to liquefy the recovered organic gases is a critical step in developing new technologies to allow manufacturing to occur in a more sustainable manner. To our knowledge, this is the first time an ACFC-ESA system has been used to capture, recover, and liquefy organic compounds with vapor pressures as low as 8.3 × 10(-5) and the first time such a system has been analyzed for process performance and energy consumption.
authors.affiliation: Department of Civil and Environmental Engineering, University of Illinois, Urbana, Illinois 61801, United States.
authors.forename: Kaitlin E
authors.initials: KE
authors.lastname: Mallouk
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Rood
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D002073:Butanes / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D005740:Gases / Q000737:chemistry*; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D008962:Models, Theoretical; D013696:Temperature; D055548:Vapor Pressure; D004980:Ethane / Q000031:analogs & derivatives; D005466:Fluorocarbons
chemical_list: D000393:Air Pollutants; D002073:Butanes; D002244:Carbon; D000077482:Carbon Fiber; D005740:Gases; D006845:Hydrocarbons, Fluorinated; C046888:butane; C063006:norflurane; D004980:Ethane; D005466:Fluorocarbons