01-09-2021 дата публикации
Номер: EP3871755A1
This invention relates to a method for removing acid gases from a gas stream, the method comprising: flowing a feed gas into a desulfurization unit including a fluidized-bed reactor to remove a substantial fraction of a sulfur compound from the feed gas, wherein the desulfurization unit produces a desulfurized gas, and wherein flowing the feed gas into the desulfurization unit comprises flowing the feed gas into contact with a sorbent; and flowing the desulfurized gas into a CO<sub>2</sub> removal unit to selectively remove a substantial fraction of CO<sub>2</sub> from the desulfurized gas, wherein flowing the feed gas into the desulfurization unit is done at a temperature range of 204 °C or greater; characterised in that the method comprises flowing the desulfurized gas, before CO<sub>2</sub> removal, into contact with steam in a water-gas-shift unit in the presence of a shift catalyst to produce carbon dioxide (CO<sub>2</sub>) and hydrogen gas (H<sub>2</sub>), and in that the sorbent is selected from the group consisting of: a metal oxide, zinc oxide, copper oxide, iron oxide, vanadium oxide, manganese oxide, stannous oxide, nickel oxide, a metal titanate, zinc titanate, a metal ferrite, zinc ferrite, copper ferrite, and a combination of two or more of the foregoing, wherein the sorbent comprises a support selected from the group consisting of: alumina (Al<sub>2</sub>O<sub>3</sub>), silicon dioxide (SiO<sub>2</sub>), titanium dioxide (TiO<sub>2</sub>), a zeolite, and a combination of two or more of the foregoing, and wherein the sorbent is regenerable.
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