Abstract: Process for producing biomethane from a biogas stream including methane, carbon dioxide and at least one impurity chosen from ammonia, volatile organic compounds, water, sulfur-based impurities (H2S) and siloxanes. A biogas stream is dried, the at least one impurity is at least partially removed by solidification and removal of the impurity. The methane and the carbon dioxide contained in the biogas obtained from the second step are separated so as to produce a biomethane stream and a CO2 stream.

Abstract: System for purifying argon by cryogenic distillation, comprising a single column surmounted by a top-end condenser, a fluid inlet in the lower part of the column, a fluid outlet in the upper part of the column, and N distillation sections where N?4, of which at least the two uppermost sections of the column are equipped respectively with a first liquid distributor and with a second liquid distributor, the second distributor being capable of performing a function of mixing together liquids that fall onto the distributor, each of the first and second distributors being positioned above the respective section and of which the two lowermost sections of the column are respectively equipped with a (N?1)th and an Nth liquid distributor capable of performing a function of mixing together liquids that fall onto the distributor, and which is arranged above the respective section, the first, second, (N?1)th and Nth distributors each being dimensioned to contain a maximum height of liquid head, that (those) of the first

Abstract: A unit for producing argon by cryogenic distillation, suitable for connection to a double air separation column consisting of first and second columns interconnected thermally, comprises an argon separation column surmounted with a top condenser and a denitrogenation column, means for withdrawing an argon-rich and nitrogen-depleted product (LAR) at the bottom of the denitrogenation column, means for connecting the top of the argon separation column to the denitrogenation column, means for sending a top gas from the argon separation column to the atmosphere, means for withdrawing a nitrogen-rich fluid from the top of the denitrogenation column, an analyser for measuring the nitrogen content at the top of the argon separation column, and means for opening and closing the means for connecting the top of the argon separation column to the denitrogenation column depending on the nitrogen content detected by the analyser.

Abstract: A plant for producing at least partially desulfurized biogas, comprising a biomass digester and/or post-digester, the digester and/or post-digester comprising: a chamber (1) comprising the biomass (2) and the gas space (3), and a system (6) for injecting an oxidizing gas into the gas space, wherein the injection system comprises a tubular means (4) comprising a T-shaped portion the vertical bar of which is placed in the axis of symmetry of the chamber and the horizontal bar of which has micro-injectors (5).

Abstract: Plant and process for the production of liquid methane from a feed gas stream comprising at least methane and carbon dioxide. A feed gas stream is injected into a CO2 crystallizer in countercurrent fashion against a stream of predominantly liquid methane, thereby crystallizing amounts of carbon dioxide from the feed gas stream. Gaseous methane recovered from the CO2 crystallizer is liquefied at a liquefaction exchanger.

Abstract: A plant for producing at least partially desulfurized biogas, comprising a biomass digester and/or post-digester, the digester and/or post-digester comprising: a chamber comprising the biomass and the gas space, and a system for injecting an oxidizing gas into the gas space, wherein the injection system comprises a tubular means formed in a grid pattern, having a centre of symmetry placed in the axis of symmetry of the chamber, and having micro-injectors.

Abstract: Plant for producing at least partially desulfurized biogas, comprising a biomass digester and/or post-digester, the digester and/or post-digester comprising: a chamber (1) in which an anaerobic digestion of the biomass takes place, leading to the production of biogas (2) and of digestate (3), a means for introducing an oxidizing gas, a desulfurization net (4) placed horizontally and fastened in the upper part of the chamber, and ropes (5) attached to said desulfurization net and which hang down to the biogas-digestate interface.

Abstract: Plant for producing at least partially desulfurized biogas, comprising a biomass digester and/or post-digester, the digester and/or post-digester comprising: a chamber comprising the biomass and the gas space, and a means for introducing an oxidizing gas, characterized in that the portion of the inner wall of the chamber situated at the level of the gas space exhibits expansions and/or hollows.

Abstract: A plant for producing at least partially desulfurized biogas, comprising a biomass digester and/or post-digester, the digester and/or post-digester comprising: a chamber comprising the biomass and the gas space, and a means for introducing an oxidizing gas, characterized in that the portion of the inner wall of the chamber situated at the level of the gas space is at least partly porous.

Abstract: Plant and process for the production of liquid methane from a feed gas stream comprising at least methane and carbon dioxide. A feed gas stream is injected into a CO2 crystallizer in countercurrent fashion against a stream of predominantly liquid methane, thereby crystallizing amounts of carbon dioxide from the feed gas stream. Gaseous methane recovered from the CO2 crystallizer is liquefied at a liquefaction exchanger.

Abstract: Process for producing biomethane from a biogas stream including methane, carbon dioxide and at least one impurity chosen from ammonia, volatile organic compounds, water, sulfur-based impurities (H2S) and siloxanes. A biogas stream is dried, the at least one impurity is at least partially removed by solidification and removal of the impurity. The methane and the carbon dioxide contained in the biogas obtained from the second step are separated so as to produce a biomethane stream and a CO2 stream.