The invention relates to a process for removal of metal carbonyls from crude synthesis gas in a gas scrubbing process with a physical scrubbing medium. Scrubbing medium laden with hydrogen sulfide (H.sub.2S) and metal carbonyls is sent to a treatment vessel having a residence time region and a scrubbing region. Metal carbonyls are precipitated from the laden scrubbing medium as metal sulfides in the residence time region. The scrubbing region is supplied with a regenerated scrubbing medium. According to the invention it is provided that the residence time region and the scrubbing region are separated from one another by a gas-permeable tray, a regenerated scrubbing medium-comprising liquid layer adjacent to the gas-permeable tray is formed in the scrubbing region, metal carbonyls outgassing from the residence time region pass through the gas-permeable tray and are absorbed by regenerated scrubbing medium in the scrubbing region, wherein scrubbing medium comprising metal carbonyls is obtained and metal carbonyls outgassing from the residence time region are cooled by the liquid layer. The invention further relates to a treatment vessel, to the use of the process, treatment vessel or apparatus according to the invention in a gas scrubbing process with methanol as the physical scrubbing medium and to the use of the treatment vessel in a process according to the invention.

The invention relates to a process for removal of metal carbonyls from crude synthesis gas in a gas scrubbing process with a physical scrubbing medium. Scrubbing medium laden with hydrogen sulfide (H.sub.2S) and metal carbonyls is sent to a treatment vessel having a residence time region and a scrubbing region. Metal carbonyls are precipitated from the laden scrubbing medium as metal sulfides in the residence time region. The scrubbing region is supplied with a regenerated scrubbing medium. According to the invention it is provided that the residence time region and the scrubbing region are separated from one another by a gas-permeable tray, a regenerated scrubbing medium-comprising liquid layer adjacent to the gas-permeable tray is formed in the scrubbing region, metal carbonyls outgassing from the residence time region pass through the gas-permeable tray and are absorbed by regenerated scrubbing medium in the scrubbing region, wherein scrubbing medium comprising metal carbonyls is obtained and metal carbonyls outgassing from the residence time region are cooled by the liquid layer. The invention further relates to a treatment vessel, to the use of the process, treatment vessel or apparatus according to the invention in a gas scrubbing process with methanol as the physical scrubbing medium and to the use of the treatment vessel in a process according to the invention.

The invention pertains to methods of reducing dissolved elements such as arsenic, selenium and mercury in aqueous solutions using, for example, various barium compounds to partition said elements to a solid phase. Such methods are particularly useful for reducing such elements at various points in coal and oil-fired power plants prior to final waste water treatment.

Techniques for removing sulfur compounds from a sulfur-containing gas stream can include contacting the gas with an absorption solution comprising a metal cation capable of reacting with the sulfur compound to form a metal sulphide precipitate and/or a metal mercaptide precipitate. In addition, the treatment can include controlling a concentration of the precipitates below a threshold to maintain rheological properties; subjecting the precipitate-enriched solution to vitalization; subjecting the precipitate-enriched solution to regeneration including oxidation; and/or other features to enhance the sulfur removal operations.

A process to treat a gas comprising hydrogen sulphide and mercaptans is described. The following steps are part of this process: (a) contacting the hydrogen sulphide and mercaptans comprising gas (1) with an aqueous solution (3) comprising sulphide-oxidising bacteria thereby obtaining a loaded aqueous solution (5) and a gas (4) having a lower content of hydrogen sulphide and mercaptans, (b) contacting the loaded aqueous solution with mercaptan reducing microorganisms immobilized on a carrier under anaerobic conditions, (c) separating the aqueous solution obtained in step (b) from the mercaptan reducing microorganisms to obtain a first liquid effluent (7), and (d) contacting the first liquid effluent (7) with an oxidant (9) to regenerate the sulphide-oxidising bacteria to obtain a second liquid effluent (11) comprising regenerated sulphide-oxidising bacteria. The sulphide-oxidising bacteria as present in step (a) are comprised of regenerated sulphide-oxidising bacteria obtained in step (d).

Disclosed is a storage-stable condensation product prepared from 1-amino-2-propanol and formaldehyde in a molar ratio in the range from 1:2.0 to 1:3.1. The condensation product contains less than 10% by weight of water. Also, disclosed is the preparation of the condensation product and the use thereof for reducing the amount of hydrogen sulphide in liquids and gases.

Disclosed is a storage-stable condensation product prepared from 1-amino-2-propanol and formaldehyde in a molar ratio in the range from 1:2.0 to 1:3.1. The condensation product contains less than 10% by weight of water. Also, disclosed is the preparation of the condensation product and the use thereof for reducing the amount of hydrogen sulphide in liquids and gases.

A method of treating a carbon dioxide rich flue gas and a flue gas treatment system for treatment of a carbon dioxide rich flue gas are provided. A boiler system includes a boiler, being operative for combusting a fuel and generating a carbon dioxide rich flue gas, and the flue gas treatment system. The flue gas treatment system includes a gas cleaning system, a nitrogen oxides reduction unit, being operative for reducing at least a portion of a nitrogen oxide(s) content of the flue gas, and a compression and cooling device being operative for pressurizing and cooling at least a portion of the flue gas treated by the gas cleaning system and the nitrogen oxide(s) reduction unit.

Provided are a waste gas processing device, a vacuum coating system, and an operation method of a waste gas processing device. The waste gas processing device is configured to remove and recover arsenic in waste gas, and includes a condensation portion and a scraping portion. The condensation portion is provided with a condensation cavity, and an air inlet, an air outlet and a discharge port communicated with the condensation cavity. The condensation portion is configured to cool waste gas charged into the condensation cavity from the air inlet, so that gaseous arsenic in the waste gas is condensed on an inner wall surface of the condensation cavity by cooling to form solid arsenic. The scraping portion is rotatably provided in the condensation cavity, and a partial surface of the scraping portion abuts against the inner wall surface of the condensation cavity.

Provided are a waste gas processing device, a vacuum coating system, and an operation method of a waste gas processing device. The waste gas processing device is configured to remove and recover arsenic in waste gas, and includes a condensation portion and a scraping portion. The condensation portion is provided with a condensation cavity, and an air inlet, an air outlet and a discharge port communicated with the condensation cavity. The condensation portion is configured to cool waste gas charged into the condensation cavity from the air inlet, so that gaseous arsenic in the waste gas is condensed on an inner wall surface of the condensation cavity by cooling to form solid arsenic. The scraping portion is rotatably provided in the condensation cavity, and a partial surface of the scraping portion abuts against the inner wall surface of the condensation cavity.