EP0367618A1
Expired / Lapsed
EP
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Process for producing carbon monoxide gas
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1989-11-02
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Granted: —
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Expires: 2009-11-02
Abstract
Abstract A process for producing CO gas without using expensive conventional apparatus, in a simple manner in a high purity and with energy saving is provided, which process comprises a step of introducing a by-produced gas such as a mixed gas obtained by reforming or partially oxidizing hydrocarbons, steel converter gas, etc. into a pressure swing adsorption cycle (PSA) system; an adsorption step or adsorbing CO₂, methane, CO, N₂, H₂, etc. in an adsorption column of the PSA system to obtain a H₂-rich gas or a N₂-rich gas passed; a step of depressurizing the adsorption column in the cocurrent direction to obtain a CO-rich gas discharged; a step of depressurizing the adsorption column direction in the counter current direction just prior to start of substantial desorption of methane and CO₂ to obtain a CO₂-rich gas discharged therefrom and having CO₂ and methane concentrated therein; and a step of repressurizing the adsorption column using a H₂-rich gas or a N₂-rich gas obtained at the beginning of the adsorption step and the depressurizing step in the cocurrent direction.
Inventors
- 👤 Shoichi Ibaragi
- 👤 Shinnosuke Ikumi
- 👤 Koichi Mikami
- 👤 Mikio Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:14
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; C; C01; C01B; C01B3/00; C01B3/50; C01B3/56; C01B32/00; C01B32/40; B01D2256/00; B01D2256/10; B01D2256/16; B01D2256/20; B01D2257/00; B01D2257/10; B01D2257/102; B01D2257/108; B01D2257/50; B01D2257/502; B01D2257/504; B01D2257/70; B01D2257/702; B01D2257/7022; B01D2257/7025; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40028; B01D2259/4003; B01D2259/40058; B01D2259/40062; B01D2259/40077; B01D2259/40081; B01D2259/404; C01B2203/00; C01B2203/04; C01B2203/042; C01B2203/043; C01B2203/0465; C01B2203/047; C01B2203/0475; C01B2203/048; Y; Y02; Y02C; Y02C20/00; Y02C20/20; Y02C20/40; Y02P; Y02P20/00; Y02P20/151; Y02P20/156
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
A process for producing carbon monoxide gas, comprising the following steps: a step of introducing a raw material gas containing carbon dioxide (CO₂), methane (CH₄), carbon monoxide (CO), nitrogen (N₂) and hydrogen (H₂) into a pressure swing adsorption cycle system; a step of adsorbing CO₂, methane, CO, N₂ and H₂ in an adsorption column of said system to obtain a H₂-rich gas or a N₂-rich gas passed therefrom (adsorption step); a step of depressurizing said adsorption column in the same gas current direction as that in said adsorption step to obtain a CO-rich gas discharged therefrom (depressurizing step in the cocurrent direction); a step of depressurizing or purging the adsorption column in a gas current direction counter to that in said adsorption step just prior to start of break through of methane and CO₂ to obtain a CO₂-rich gas discharged therefrom (depressurizing or purging step in the counter current direction); and a step of repressurizing the adsorption column using a H₂-rich gas or a N₂-rich gas (repressurizing step in the counter current direction).
Claim 2
Dependent Claim
173 words
A process for producing carbon monoxide gas, comprising the following steps: a step of introducing a raw material gas containing carbon dioxide (CO₂), methane (CH₄), carbon monoxide (CO), nitrogen (N₂) and hydrogen (H₂) into a pressure swing adsorption cycle system; a step of adsorbing CO₂, methane, CO, N₂ and H₂ in an adsorption column of said system to obtain a H₂-rich gas or a N₂-rich gas passed therefrom (adsorption step); a step of depressurizing said adsorption column in the same gas current direction as that in said adsorption step to obtain a CO-rich gas discharged therefrom (depressurizing step in the cocurrent direction); a step of depressurizing or purging the adsorption column in a gas current direction counter to that in said adsorption step just prior to start of break through of methane and CO₂ to obtain a CO₂-rich gas discharged therefrom (depressurizing or purging step in the counter current direction); and a step of repressurizing the adsorption column using a H₂-rich gas or a N₂-rich gas (repressurizing step in the counter current direction).
Claim 3
Dependent Claim
38 words
A process according to claim 1 wherein the H₂-rich gas or the N₂-rich gas at the step of repressurizing is one obtained at the adsorption step or at the beginning of the depressurizing step in the cocurrent direction.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein said H₂- or N₂-rich gas obtained in the adsorption step is utilized for repressurizing another column.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein said H₂- or N₂-rich gas obtained at the beginning of the depressurizing in the cocurrent direction is utilized for equalizing or purging another column.
Claim 6
Dependent Claim
27 words
A process according to claim 1, wherein said CO-rich gas is one obtained by depressurizing said column down to 30-200 torr by means of a vacuum pump.
Claim 7
Dependent Claim
39 words
A process according to claim 1, wherein said purging in the counter current direction is carried out by purging with H₂- or N₂-rich gas at a normal pressure or at a 30-200 torr by means of a vacuum pump.
Claim 8
Dependent Claim
39 words
A process according to claim 1, wherein a high concentration gas of CO₂ and methane obtained at said depressurizing step in the counter current direction is mixed with said raw material gas to enhance CO concentration in the gas.
Claim 9
Dependent Claim
26 words
A process according to claim 7, wherein said raw material gas is obtained from a reformer, a partially oxidizing furnace of hydrocarbons or a steel converter.
Claim 10
Dependent Claim
34 words
A process according to claim 1, wherein said pressure swing adsorption cycle system is combined with a CO pressure swing adsorption cycle system to obtain a high purity CO gas from a CO-rich gas.
References Cited (Backward Citations)
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