Process and apparatus for producing ultra pure co2 in a carbon capture process
AssigneeUop LLC
InventorsAnh Ngo, John D. Wilkinson, Bradley Russell, Oluwaseyi Kayode, Kyle Cuellar
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Abstract
Processes for producing two CO2 streams having different purities, including one stream comprising ultra high purity CO2. The processes incorporate a second fractionation column in a CO2 fractionation process. The bottoms stream from the first cryogenic fractionation column is sent to the second CO2 fractionation column. The second CO2 fractionation column can produce ultra high purity CO2. The bottoms stream from the first column can be divided and a portion of the bottoms stream can be recovered as a second CO2 product stream having a lower purity than the purity of the product stream.
Claims20
A process for producing an ultra high purity CO2 stream comprising:
- separating a CO2 containing stream in a first cryogenic CO2 fractionation column into a first overhead stream and a first CO2 bottoms stream;
- and
- separating the first CO2 bottoms stream into a second overhead stream and a CO2 product stream comprising ultra high purity CO2 in a second CO2 fractionation column;
- and
- wherein the second CO2 fractionation column has a pressure less than a pressure of the first CO2 fractionation column.
A process for producing two CO2 product streams comprising:
- separating a CO2 containing stream in a first cryogenic CO2 fractionation column into a first overhead stream and a first CO2 bottoms stream;
- dividing the first CO2 bottoms stream into a first portion and a second portion;
- separating the first portion of the first CO2 bottoms stream into a second overhead stream and a CO2 product stream comprising CO2 having a first purity in a second CO2 fractionation column;
- recovering the CO2 product stream;
- recovering the second portion of the first CO2 bottoms stream as a second CO2 product stream, the second CO2 product stream having a second purity less than the first purity;
- separating the first overhead stream in a pressure swing adsorption (PSA) system into a CO2-lean high-pressure stream and a CO2-rich low-pressure tail gas stream;
- and
- recycling the tail gas stream to the first cryogenic CO2 fractionation column.
Dependencies are inferred from the claim text.