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Sample N \/\N /\N I 4 H OH OH Condition 15kPaCO2 at40°C. 100 kPa CO2 at40° C. 15kPaCO2 at60°C. 100kPaCO2 at60°C. 15kPaCO2 at80°C. 100kPaCO2 at80°C. 15kPaCO2 at40°C. 100 kPa CO2 at40° C. 0.747 0.947 0.593 0.807 0.497 0.735 0.681 0.849 0.138 0.254 0.103 0.246 0.118 0.149 0.072 0.156 % Difference 22.66 36.65 21.02 29.95 31.13 25.43 11.82 22.51 19 TABLE 3-continued Absorption capacity difference of synthetic amino alcohols compared with MEA. CO2 Absorption loading Capacity at25° C. Difference (mole (mole COZ/mole COZ/mole amine) amine) 20 /\)\15kPaCO2at60°C.0.541 100kPaCO2at60°C. 0.729 15kPaCO2at80°C. 0.396 100kPaCO2at80°C. 0.565 0.051 10.41 8 17.39 4.49 —3.58 14.12 36.80 —34.08 43.16 —0.264 —69.66 OH 15kPaCO2at40°C. 0.695 100kPaCO2at40°C. 0.948 15kPaCO2at60°C. 0.323 100kPaCO2at60°C. 0.889 15kPaCO2at80°C. 0.115 100kPaCO2at80°C. 0.352 9 *negativevalue (—)means theAbsorption islowerthanMEA. We claim: 9.Themethodaccordingtoclaim1,whereintheamino alcoholis4-propylamino-2-butanol. US 7,910,078B2 0.108 0.017 —0.021 0.086 —0.234 0.255 —0.167 0.268 1.A methodforremovingcarbondioxide(CO2)fromagas streamcomprisingcontactingthegasstreamwithaliquid35 10.Themethodaccordingtoclaim1,whereintheamino absorbent consisting essentially of an aqueous solvent and an amino alcohol of the formula I: alcohol is 4-(ethyl-methyl-amino)—2-butanol. 11. The method according claim 1, wherein the aqueous solvent solubiliZes the amino alcohol and is an absorbent for 40CO2 12. The method according to claim 1,wherein the aqueous R1\ M 2/N R 45 solvent is selected from water, a short-chain alcohol and combinationsthereof. 13.Themethodaccordingtoclaim12,whereintheaque oussolventisdeionizedwater. 14. The method according to claim 12, wherein the aque ous solvent is methanol or ethanol. 15. The method according to claim 1, wherein the condi tions for absorption of CO2 by the liquid absorbent and thereby,removalofCO2fromthegasstreamcomprisecon tactingthegasstreamwiththeliquidabsorbentatatempera ture of about 25° C. to about 90° C. and at a pressure of about 1 to about 120 kPa. 16. The method according to claim 15, wherein the condi tions for absorption of CO2 by the liquid absorbent and thereby,removalofCO2 fromthegasstreamcomprisecon tactingthegasstreamwiththeliquidabsorbentatatempera ture of about 40° C. to about 80° C. and at a pressure of about 15 to about 110 kPa. 17.Themethodaccordingtoclaim1,whereinthegas stream is a combustion exhaust gas. 18. The method according to claim 17, wherein the com bustion exhaust gas is from gas streams of power plants, re?neries or cement manufacturers. 19.Themethodaccordingtoclaim1,whereinthegas stream comprises from about 1% to about 100% by volume CO2. wherein R1 and R2 are independently selected from H and Cl_1Oalkyl,or R1andR2arelinkedtoforma5to12-memberedcarbocy- 50 clicringsystemunderconditionsforabsorptionofCO2 bytheabsorbentandthereby,removalofCO2 fromthe gas stream. 2. The method according to claim 1, wherein R1 and R2 are independentlyselectedfromH andCl_6alkyl. 3. The method according to claim 2, wherein R1 and R2 are independentlyselectedfromH andCl_4alkyl. 4. The method according to claim 1, wherein R1 and R2 are linked to form a 5 to 10-membered carbocyclic ring system. 55 5.Themethodaccordingtoclaim4,whereinR1andR2are60 linked to form a 5 or 6-membered carbocyclic ring system. 6. The method according to claim 1, wherein the amino alcoholis4—(diethylamino)-2-butanol. 7. The method according to claim 1, wherein the amino alcoholis4—(isopropylamino)—2-butanol. 65 8. The method according to claim 1, wherein the amino alcoholis4-(piperidino)-2-butanol. OH (I) —39.93PDF Image | METHOD OF CAPTURING CARBON DIOXIDE FROM GAS STREAMS
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