Abstract: A method for operating a gas scrubber is disclosed in which components are removed from a crude gas by scrubbing with a chemical or physical scrubbing medium to obtain a pure gas present at elevated pressure which, after heating, is introduced into an expansion machine which after work-performing decompression the pure gas leaves at an exit temperature. The amount of heat supplied to the pure gas during heating thereof is deliberately altered to approximate the exit temperature thereof to a predetermined target value at all times.

Abstract: A method and device for gas scrubbing, in which, in a first scrubbing step, substances of a first kind and, in a subsequent second scrubbing step, substances of a second kind are selectively washed out from the gas mixture that is made to flow in countercurrent to physically acting scrubbing agents, wherein part of the scrubbing agent that is free from substances of the first kind but laden with substances of the second kind in the second scrubbing step is used in the first scrubbing step, and so there occurs a scrubbing agent stream that is laden with substances of the first and second kinds, during the regeneration of which a partly regenerated scrubbing agent stream (semilean); that contains substances of the first and second kinds but has a lower content of substances of the first kind than the scrubbing agent stream laden in the first scrubbing step is generated.

Abstract: A method and a device for separating off an electrolyte from a first synthesis gas and a second synthesis gas, each containing an electrolyte. The two synthesis gases are each subjected in a scrubbing column to a water scrubbing, in which a substantially electrolyte-free synthesis gas and also a scrubbing water loaded with an electrolyte that has been separated off are obtained. At least a part of the scrubbing water that was loaded with an electrolyte that has been separated off in the scrubbing of the first synthesis gas is used as scrubbing medium in the scrubbing of the second synthesis gas.

Abstract: A method for operating a gas scrubber is disclosed in which components are removed from a crude gas by scrubbing with a chemical or physical scrubbing medium to obtain a pure gas present at elevated pressure which, after heating, is introduced into an expansion machine which after work-performing decompression the pure gas leaves at an exit temperature. The amount of heat supplied to the pure gas during heating thereof is deliberately altered to approximate the exit temperature thereof to a predetermined target value at all times.

Abstract: A process and an apparatus for conducting a gas scrubbing operation are disclosed, in which at least substances of a first type are separated from a gas mixture wherein two or more types of substance by scrubbing with a physical scrubbing medium and a scrubbing medium laden with separated substances of the first type is treated by stripping in order, through the removal of a portion of the substances separated, to obtain a partly regenerated scrubbing medium which is subsequently used again for extractive scrubbing of substances of the first type out of the gas mixture. The characteristic feature is that heat is supplied to the laden scrubbing medium after the commencement and prior to the end of the stripping operation.

Abstract: The invention relates to a process and an apparatus for separating metal carbonyls from a gas mixture (1) by gas scrubbing with a physically acting scrubbing medium (6), where scrubbing medium (8) loaded with metal carbonyls in the scrub (W) is regenerated and is subsequently reused for separating off metal carbonyls. The invention is characterized in that in order to regenerate the loaded scrubbing medium (8) materials dissolved in the scrubbing medium are separated off only to the extent necessary for removal of the metal carbonyls.

Abstract: A method and a device for separating off an electrolyte from a first synthesis gas and a second synthesis gas, each containing an electrolyte. The two synthesis gases are each subjected in a scrubbing column to a water scrubbing, in which a substantially electrolyte-free synthesis gas and also a scrubbing water loaded with an electrolyte that has been separated off are obtained. At least a part of the scrubbing water that was loaded with an electrolyte that has been separated off in the scrubbing of the first synthesis gas is used as scrubbing medium in the scrubbing of the second synthesis gas.

Abstract: A method and device for gas scrubbing, in which, in a first scrubbing step substances of a first kind and, in a subsequent second scrubbing step, substances of a second kind are selectively washed out from the gas mixture that is made to flow in countercurrent to physically acting scrubbing agents, wherein part of the scrubbing agent that is free from substances of the first kind but laden with substances of the second kind in the second scrubbing step is used in the first scrubbing step, and so there occurs a scrubbing agent stream that is laden with substances of the first and second kinds, during the regeneration of which a partly regenerated scrubbing agent stream (semilean); that contains substances of the first and second kinds but has a lower content of substances of the first kind than the scrubbing agent stream laden in the first scrubbing step is generated.

Abstract: The invention relates to a method of shutting down at least part of a gas scrub (G), and to a gas scrub (G) which comprises an absorber (A) and a regeneration part (R). In normal operation a scrubbing medium (1) is circulated in a scrubbing medium circuit and thus loaded in the absorber (A) at elevated pressure with substances removed from a gas mixture. The substances are removed from the loaded scrubbing medium (2) in the regeneration part (R). Scrubbing medium (3) is removed from the scrubbing medium circuit, transferred into a storage tank (S) and stored there at atmospheric pressure. Loaded scrubbing medium (3) is warmed (E1) and intermediately stored at elevated pressure in a degassing vessel (Z) in order to remove absorbed substances (5) from the scrubbing medium before it is passed into the storage tank (S).

Abstract: The invention relates to a process and apparatus for recovering sulfur (9). In a sour gas scrubbing apparatus (S) comprises a scrubbing part (SP) and a regeneration part (RP), wherein sulfur components and carbon dioxide are selectively removed from a crude synthesis gas (2) with the aid of a circulating scrubbing agent (3). A sulfur-containing gas fraction (8) produced during the regeneration of loaded scrubbing agent is supplied to a sulfur recovery system (SR) in which an off-gas (10) comprising carbon dioxide and also sulfur components is formed. The off-gas is hydrogenated (H) and subsequently subjected to a gas scrubbing operation (Z). The hydrogenated off-gas (12) is scrubbed, independently of the crude synthesis gas (2), and scrubbing agent (13) removed from the scrubbing agent circuit of the sour gas scrubbing apparatus (S) is used to scrub out sulfur components from the hydrogenated off-gas (12).

Abstract: The invention relates to a process and an apparatus for separating metal carbonyls from a gas mixture (1) by gas scrubbing with a physically acting scrubbing medium (6), where scrubbing medium (8) loaded with metal carbonyls in the scrub (W) is regenerated and is subsequently reused for separating off metal carbonyls. The invention is characterized in that in order to regenerate the loaded scrubbing medium (8) materials dissolved in the scrubbing medium are separated off only to the extent necessary for removal of the metal carbonyls.

Abstract: The invention relates to a process and apparatus for recovering sulfur (9). In a sour gas scrubbing apparatus (S) comprises a scrubbing part (SP) and a regeneration part (RP), wherein sulfur components and carbon dioxide are selectively removed from a crude synthesis gas (2) with the aid of a circulating scrubbing agent (3). A sulfur-containing gas fraction (8) produced during the regeneration of loaded scrubbing agent is supplied to a sulfur recovery system (SR) in which an off-gas (10) comprising carbon dioxide and also sulfur components is formed. The off-gas is hydrogenated (H) and subsequently subjected to a gas scrubbing operation (Z). The hydrogenated off-gas (12) is scrubbed, independently of the crude synthesis gas (2), and scrubbing agent (13) removed from the scrubbing agent circuit of the sour gas scrubbing apparatus (S) is used to scrub out sulfur components from the hydrogenated off-gas (12).

Abstract: The invention relates to a method and apparatus for regenerating a scrubbing medium used at elevated pressure in a physical gas scrubber for purifying a feed gas containing hydrogen and carbon monoxide. The scrubbing medium, loaded with carbon dioxide and sulphur components, is expanded to a pressure between 0.4 and 1.7 bar(a), liberating a carbon dioxide-rich, sulphur component-containing gas. This gas is compressed and introduced into a scrubbing column, in which sulphur components are scrubbed out of the carbon dioxide-rich gas using sulphur-free scrubbing medium.

Abstract: The invention relates to a process for purifying crude synthesis gas (1) containing metal carbonyls, in which undesirable substances such as sulphur components and/or carbon dioxide (CO2) and/or hydrocyanic acid (HCN) are scrubbed out by scrubbing with a physically acting scrubbing medium in at least one process step (main scrub (H)), and also an apparatus for carrying out the process. The crude synthesis gas (1) before introduction into the main scrub (H) is subjected to a gas scrub (carbonyl scrub (C)) in which a partial amount (4) of the laden scrubbing medium (2) taken off from the main scrub is used as scrubbing medium, with the partial amount (4) being chosen so that the metal carbonyls are (selectively) separated off from the crude synthesis gas (1) in the carbonyl scrub (C) largely independently of the other gas components.

Abstract: The invention relates to a process for scrubbing medium regeneration in a physical gas scrubbing, in which predominantly substances of a first type are separated from a laden scrubbing medium (2, 17) by stripping (cold stripping) in a stripping column (enrichment column (A)) and predominantly substances of a second type are separated from a laden scrubbing medium (2, 17) by subsequent thermal regeneration in a thermal regeneration column (H), and to an apparatus for carrying out the process. The laden scrubbing medium (6) is, after the cold stripping, withdrawn from the enrichment column (A), preheated (E1), expanded (a) and subsequently subjected to a thermal desorption in a device for carrying out a thermal desorption (thermal desorption device (W)), in which the content of substances of the first type in the laden scrubbing medium is further reduced.

Abstract: The invention relates to a process for purifying crude synthesis gas (1) containing metal carbonyls, in which undesirable substances such as sulphur components and/or carbon dioxide (CO2) and/or hydrocyanic acid (HCN) are scrubbed out by scrubbing with a physically acting scrubbing medium in at least one process step (main scrub (H)), and also an apparatus for carrying out the process. The crude synthesis gas (1) before introduction into the main scrub (H) is subjected to a gas scrub (carbonyl scrub (C)) in which a partial amount (4) of the laden scrubbing medium (2) taken off from the main scrub is used as scrubbing medium, with the partial amount (4) being chosen so that the metal carbonyls are (selectively) separated off from the crude synthesis gas (1) in the carbonyl scrub (C) largely independently of the other gas components.