A high efficient absorbent for the separation of H 2 S from low partial pressure coke oven gas
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RESEARCH ARTICLE
A high efficient absorbent for the separation of H2S from low partial pressure coke oven gas XiangFeng Tian 1 & LeMeng Wang 1 & Pan Zhang 1
&
Dong Fu 1 & ZhouYao Wang 1
Received: 15 July 2020 / Accepted: 21 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To high efficiently remove H2S from low partial pressure coke oven gas (COG), a novel activator (tetramethylammonium arginine, [N1111][Arg]) was used to blend with N-methyldiethanolamine (MDEA) for the absorption of H2S. High concentrated [N1111][Arg]-MDEA aqueous solution was used as absorbent. Thermodynamic properties including absorption amount and H2S loading values were measured, then the kinetic apparent absorption rate was calculated based on the change of absorption amount with time. The removal efficiency of H2S in simulated COG was verified in tray towers. Compared with monoethanolamine (MEA)-MDEA and tetramethylammonium glycinate ([N1111][Gly])-MDEA aqueous solutions, [N1111][Arg]-MDEA aqueous solution takes advantages of higher absorption capacity, absorption rate and removal efficiency. Our results showed that the proposed absorbent has good industrial application prospect in coke oven gas desulfurization, because it achieved 100% removal of H2S in the tray tower containing only 4 sieve plates under high concentrated condition (water content < 45%), which may significantly decrease the energy consumption. Keyword Absorption performance . Removal efficiency . COG . H2S . [N1111][Arg] . MDEA
Introduction China is the world’s largest coke producer and consumer (Li et al. 2019). Based on the coke output (438 million tons) in 2018, the annual output of coke-oven gas in China is as high as 130–150 billion cubic meters. Although the specific composition of coke oven gas varies with different coal and coking conditions, its main components are hydrogen and methane, which have high calorific value (Bermúdez et al. 2013; Razzaq et al. 2013). After removing condensable water and trace toxic components, these coke-oven gasses can be used as clean fuel, which is of great significance to environmental protection. H2S, as one of the most undesirable impurities, is highly corrosive, flammable, and toxic. It must be removed to improve gas quality, reduce environmental pollution and Responsible editor: Tito Roberto Cadaval Jr * Pan Zhang [email protected] 1
Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, People’s Republic of China
equipment corrosion, and avoid threats to human health (Wiheeb et al. 2013). At present, the main desulfurization method of coke-oven gas is chemical absorption using alkanolamine like diethanolamine (DEA), methyldiethanolamine (MDEA), diisopropanolamine (DIPA) as absorbents (Shah et al. 2017). H2S can be selectively absorbed in tray tower or packed tower. The purified gas is discharged, and the rich liquid is transported into the regeneration tower for regeneration and recycling. MDEA solution has been widely used (B
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