Aminosilicone solvent recovery methods and systems
View Patent ↗The present invention is directed to aminosilicone solvent recovery methods and systems. The methods and systems disclosed herein may be used to recover aminosilicone solvent from a carbon dioxide containing vapor stream, for example, a vapor stream that leaves an aminosilicone solvent desorber apparatus. The methods and systems of the invention utilize a first condensation process at a temperature from about 80° C. to about 150° C. and a second condensation process at a temperature from about 5° C. to about 75° C. The first condensation process yields recovered aminosilicone solvent. The second condensation process yields water.
1. A method for recovering aminosilicone solvent from a first gas stream, the method comprising:
performing an absorption process, wherein the absorption process comprises contacting a flue gas with a lean stream to form a clean flue gas stream and a rich stream;
performing a desorption process, wherein the desorption process comprises heat treating the rich stream at a temperature from about 120° C. to about 160° C. to form a lean stream and the first gas stream, wherein the rich stream comprises rich aminosilicone solvent, and wherein the lean stream comprises lean aminosilicone solvent;
performing a first condensation process, wherein the first condensation process comprises condensing the first gas stream at a temperature from about 80° C. to about 150° C. to form a recovered aminosilicone stream and a second gas stream, wherein the recovered aminosilicone stream comprises lean aminosilicone solvent and the second gas stream comprises carbon dioxide and water vapor; and
performing a second condensation process, wherein the second condensation process comprises condensing the second gas stream at a temperature from about 5° C. to about 75° C. to form a waste water stream and a third gas stream; wherein the waste water stream comprises water and the third gas stream comprises carbon dioxide.
2. The method of claim 1 , wherein the first gas stream and the recovered aminosilicone stream further comprise triethylene glycol.
3. The method of claim 1 , wherein the first gas stream further comprises rich aminosilicone solvent.
4. The method of claim 1 , wherein the recovered aminosilicone stream further comprises rich aminosilicone solvent.
5. The method of claim 1 , wherein the desorption process further comprises heat treating the recovered aminosilicone stream at a temperature from about 120° C. to about 160° C. to form the lean stream and, optionally, the first gas stream.
6. The method of claim 1 , further comprising:
performing a compression process on the third gas stream, wherein the compression process comprises compressing the third gas stream to form a compressed composition, wherein the compressed composition comprises high pressure carbon dioxide.
7. The method of claim 1 , wherein the first condensation process comprises condensing the first gas stream at a temperature from about 80° C. to about 110° C.
8. The method of claim 1 , wherein the first condensation process comprises condensing the first gas stream at a temperature from about 85° C. to about 95° C.
9. The method of claim 1 , wherein the second condensation process comprises condensing the second gas stream at a temperature from about 20° C. to about 70° C.
10. The method of claim 1 , wherein the second condensation process comprises condensing the second gas stream at a temperature from about 35° C. to about 45° C.