Method and arrangement for separating carbon dioxide from a feed stream containing carbon dioxide
A process is proposed for separating carbon dioxide from a feed stream containing carbon dioxide, in which at least part of the feed stream is subjected to temperature swing adsorption to obtain a first and a second successive stream, wherein, in each case relative to the feed stream, the first subsequent stream is depleted in carbon dioxide and the second subsequent stream is enriched in carbon dioxide, and at least part of the second subsequent stream is subjected to membrane separation to obtain a third and a fourth subsequent stream, the third subsequent stream being depleted in carbon dioxide and the fourth subsequent stream being enriched in carbon dioxide, in each case relative to the second subsequent stream. A corresponding arrangement is also an object of the invention.
1 . A method for separation of carbon dioxide from a carbon dioxide-containing feed stream, comprising:
subjecting at least a part of the feed stream to a temperature swing adsorption to obtain a first successive stream and a second successive stream, the first successive stream being depleted in carbon dioxide and the second successive stream being enriched in carbon dioxide, in each case in relation to the feed stream, and
subjecting at least a part of the second successive stream to a membrane separation to obtain a third successive stream and a fourth successive stream, the third successive stream being depleted in carbon dioxide and the fourth successive stream being enriched in carbon dioxide, in each case relative to the second successive stream,
subjecting at least a part of the fourth successive stream to a compression and partial liquefaction in a heat exchanger to obtain a gaseous fraction and a liquid fraction, the gaseous fraction being depleted in carbon dioxide and the liquid fraction being enriched in carbon dioxide, in each case relative to the fourth successive stream, and
subjecting at least a part of the gaseous fraction to the temperature swing adsorption together with the feed stream and subjecting at least part of the liquid fraction to an expansion and used as refrigerant in a heat exchanger for partial liquefaction.
2 . The method according to claim 1 , wherein the feed stream has a carbon dioxide content of 0.1 to 5 mole percent, and/or the first successive stream has a carbon dioxide content of 0.0001 to 1 mole percent, and/or the second successive stream has a carbon dioxide content of 0.5 to 10 mole percent, and/or the third successive stream has a carbon dioxide content of 0.5 to 5 mole percent, and/or the fourth successive stream has a carbon dioxide content of 50 to 90 mole percent, and/or the gaseous fraction has a carbon dioxide content of 20 to 70 mole percent, and/or the liquid fraction has a carbon dioxide content of 90 to 99.999 mole percent.
3 . The method according to claim 1 , wherein the feed stream is formed using natural gas.
4 . The method according to claim 3 , wherein the feed stream is withdrawn from a natural gas pipeline and at least a portion of the first successive stream is fed back into the natural gas pipeline.
5 . The method according to claim 3 , wherein at least a portion of the first successive stream is subjected to a liquefaction.
6 . The method according to claim 1 , wherein the heat exchanger used in the partial liquefaction is a plate heat exchanger.
7 . The method according to claim 1 , wherein the feed stream comprises methane and one or more further components selected from water and hydrocarbons boiling higher than methane, ethane or propane, and wherein, in each case relative to the feed stream, the first successive stream is depleted in the one or more further components and the second successive stream is enriched in the one or more further components.
8 . The method according to claim 1 , wherein a portion of the first successive stream is used to regenerate an adsorbent in the temperature swing adsorption.
9 . The method according to claim 8 , wherein regeneration of the adsorbent is carried out at a temperature of 100 to 300° C.
10 . The method according to claim 1 , wherein the feed stream has a carbon dioxide content of 0.1 to 2 mole percent, and/or the first successive stream has a carbon dioxide content of 0.001 to 0.1 mole percent, and/or the second successive stream has a carbon dioxide content of 0.5 to 10 mole percent, and/or the third successive stream has a carbon dioxide content of 0.5 to 5 mole percent, and/or the fourth successive stream has a carbon dioxide content of 50 to 90 mole percent, and/or the gaseous fraction has a carbon dioxide content of 30 to 80 mole percent, and/or the liquid fraction has a carbon dioxide content of 90 to 99.999 mole percent.
11 . The method according to claim 1 , wherein the feed stream has a carbon dioxide content of 0.1 to 2 mole percent.
12 . The method according to claim 1 , wherein the feed stream has a carbon dioxide content of 0.1 to 5 mole percent.
13 . The method according to claim 1 , wherein the first successive stream has a carbon dioxide content of 0.0001 to 1 mole percent.
14 . The method according to claim 1 , wherein the first successive stream has a carbon dioxide content of 0.001 to 0.1 mole percent.
15 . The method according to claim 1 , wherein the second successive stream has a carbon dioxide content of 0.5 to 10 mole percent.
16 . The method according to claim 1 , wherein the third successive stream has a carbon dioxide content of 0.5 to 5 mole percent.
17 . The method according to claim 1 , wherein the fourth successive stream has a carbon dioxide content of 50 to 90 mole percent.
18 . The method according to claim 1 , wherein the gaseous fraction has a carbon dioxide content of 20 to 70 mole percent.