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US 12,018,886 B2Granted
Process for the separation and liquefaction of methane and carbon dioxide with solidification of carbon dioxide outside the distillation column
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorJorge Ernesto Tovar Ramos
Life of this patent
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Abstract
A combined plant for cryogenic separation and liquefaction of methane and carbon dioxide in a biogas stream, including a mixing means, a compressor, a first exchanger, a distillation column, a second exchanger, a separating means, an expanding means, and a separator vessel. Wherein, the mixing means is configured such that the recycle gas is the overhead vapour stream, and the first exchanger and the expanding means are combined.
Claims4
A cryogenic separation unit for separation of methane and carbon dioxide, comprising:
- a distillation column comprising a cold section at the top of the column and a hot section at the bottom of the column,
- at least two external containers external to the distillation column, configured to place in contact a liquid from the cold section and a vapour rising from the hot section and for trapping solid CO2, and
- a device for regenerating the at least two external containers, comprising an extracting means for extracting a fluid from the distillation column which is configured to liquefy the solid CO2, a means for introducing the fluid into the at least two external containers in regeneration thereby bringing about about the melting of the solid CO2 and a means for reintroducing the resulting liquid CO2-vapour mixture into the distillation column.
Dependencies are inferred from the claim text.