# US 2014/0190350 A1 · Method and device for obtaining gas products > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190350 A1 - Document ID: US20140190350A1 - Status: Published application - Kind: A1 - Application number: 14/130,114 - Filed: 2012-06-14 - Published: 2014-07-10 - Earliest claimed: 2011-07-01 - Assignees: Linde Aktiengesellschaft - Inventors: Horst Weiss; Alexander Brandl - Web page: https://patentgrep.com/patent/US20140190350A1 ## CPC - B01D 53/18: Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32) - B01D 53/1406: {Multiple stage absorption} - B01D 53/1425: {Regeneration of liquid absorbents} - B01D 53/1462: {Removing mixtures of hydrogen sulfide and carbon dioxide} - C01B 3/52: by contacting with liquids; Regeneration of used liquids - B01D 2252/2021: Methanol - B01D 2252/2026: Polyethylene glycol, ethers or esters thereof, e.g. Selexol - Y02C 20/40: of CO2 - Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. CO2 - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG] - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract The invention relates to a method and to a device for physical gas scrubbing, wherein a feed gas (1) containing hydrogen, carbon monoxide, carbon dioxide and also carbonyl sulphide and/or hydrogen sulphide is conducted through a first scrubbing section (W1) in countercurrent to a scrubbing medium preloaded with carbon dioxide, in order to separate sulphur components substantially selectively off from the feed gas and to generate a desulphurized gas mixture (3). In a second scrubbing section, carbon dioxide is separated off from only a subquantity of the desulphurized gas mixture by scrubbing with an unloaded scrubbing medium (4) and the resultant carbon dioxide-preloaded scrubbing medium is used completely in the first scrubbing section (W1) as scrubbing medium. ## Claims ### Claim 1 A method for physical gas scrubbing, wherein a feed gas containing hydrogen, carbon monoxide, carbon dioxide and also carbon oxide sulfide and/or hydrogen sulfide is directed through a first scrubbing section in counterflow to a scrubbing medium which is preladen with carbon dioxide in order to generally selectively separate sulfur components from the feed gas and to produce a desulfurized gas mixture, characterized in that carbon dioxide is separated from only a partial quantity of the desulfurized gas mixture in a second scrubbing section by scrubbing with an unladen scrubbing medium and the scrubbing medium, preladen with carbon dioxide, which is obtained in the process is used completely in the first scrubbing section as scrubbing medium. ### Claim 2 (depends on 1) The method as claimed in claim 1, characterized in that the scrubbing medium enters the first scrubbing section in a state saturated with carbon dioxide. ### Claim 3 (depends on 1) The method as claimed in claim 1, characterized in that heat of solution is extracted from the scrubbing medium in the first scrubbing section in at least one cooling step. ### Claim 4 (depends on 3) The method as claimed in claim 3, characterized in that the cooling is carried out so that the scrubbing medium discharges from the first scrubbing section at a temperature which differs by 5° C. at most from the temperature at which it enters the first scrubbing section. ### Claim 5 (depends on 1) The method as claimed in claim 1, characterized in that the part of the desulfurized gas mixture which is not fed to the second scrubbing section is expanded in an expansion turbine, performing work. ### Claim 6 (depends on 5) The method as claimed in claim 5, characterized in that desulfurized gas mixture which is cooled during the work-performing expansion is used for cooling a sulfur-free scrubbing medium flow which is used during scrubbing-medium regeneration for backwashing of sulfur components. ### Claim 7 (depends on 1) The method as claimed in claim 1, characterized in that the part of the desulfurized gas mixture which is not fed to the second scrubbing section is fed as fuel to a gas turbine or is used as synthesis gas for methanol production. ### Claim 8 (depends on 1) The method as claimed in claim 1, characterized in that methanol or dimethyl ether of polyethyleneglycol or N-methyl-2-pyrrolidone is used as scrubbing medium. ### Claim 9 A device for separating sulfur components and carbon dioxide from a feed gas containing hydrogen, carbon dioxide and also sulfur components by means of physical gas scrubbing, having an absorption column, in which a first scrubbing section is arranged beneath a second scrubbing section, wherein the absorption column in its lower region has a gas supply for feeding the feed gas and at its head has a stripping device for the stripping of a gas mixture which is cleaned of sulfur components and carbon dioxide, and also a scrubbing-medium supply for feeding an unladen scrubbing medium into the second scrubbing section, characterized in that a side-disposed gas stripping line is arranged between the first scrubbing section and the second scrubbing section, via which a gas mixture, which has been desulfurized in the first scrubbing section, can be stripped. ### Claim 10 (depends on 9) The device as claimed in claim 9, characterized in that the scrubbing-medium supply has at least two introduction points arranged at different levels, to which the amount of unladen scrubbing medium can be distributed. ### Claim 11 (depends on 9) The device as claimed in claim 9, characterized in that it has an expansion turbine connected to the side-disposed stripping line of the absorption column and in which desulfurized gas mixture can be expanded, performing work.