FIELD: chemistry.
SUBSTANCE: method for separating carbon dioxide (CO2) from a gas stream and the apparatus for separating carbon dioxide (CO2) from a CO2-comprising stream are claimed. The method comprises cooling the gas stream at the cooling step to obtain a cooled gas stream, and cooling said cooled gas stream in the Laval nozzle to obtain one type of CO2 - solid or liquid, or both of these types of CO2. The method additionally includes separating at least a portion of one of the types of CO2 - solid or liquid, or both of these types of CO2 from the cooled gas stream in the Laval nozzle, to obtain the CO2 -enriched stream and the CO2-depleted gas stream. The method additionally comprises expanding the CO2 -depleted gas stream in the expander located below the Laval nozzle downstream to obtain the CO2 -depleted cooled gas stream and recycling at least part of the cooled CO2 - depleted gas flow to the cooling stage for cooling the gas stream.
EFFECT: invention allows to reduce the nozzle surface erosion and to reduce the overall pressure drop.
20 cl, 6 dwg
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