CN115138178A - Polyamine-based organic amine and ionic liquid composite CO 2 Absorbent, preparation method and application thereof - Google Patents
Polyamine-based organic amine and ionic liquid composite CO 2 Absorbent, preparation method and application thereof Download PDFInfo
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- CN115138178A CN115138178A CN202210802490.1A CN202210802490A CN115138178A CN 115138178 A CN115138178 A CN 115138178A CN 202210802490 A CN202210802490 A CN 202210802490A CN 115138178 A CN115138178 A CN 115138178A
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- 230000002745 absorbent Effects 0.000 title claims abstract description 43
- 239000002250 absorbent Substances 0.000 title claims abstract description 43
- 239000002608 ionic liquid Substances 0.000 title claims abstract description 31
- 150000001412 amines Chemical class 0.000 title claims abstract description 24
- 229920000768 polyamine Polymers 0.000 title claims abstract description 14
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims abstract description 36
- 238000003795 desorption Methods 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- -1 1-ethyl-3-methylimidazole amino acid salt Chemical class 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 5
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 5
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 claims description 5
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 claims description 5
- HNDVDQJCIGZPNO-YFKPBYRVSA-N L-histidine Chemical compound OC(=O)[C@@H](N)CC1=CN=CN1 HNDVDQJCIGZPNO-YFKPBYRVSA-N 0.000 claims description 5
- KDXKERNSBIXSRK-YFKPBYRVSA-N L-lysine Chemical compound NCCCC[C@H](N)C(O)=O KDXKERNSBIXSRK-YFKPBYRVSA-N 0.000 claims description 5
- 239000004472 Lysine Substances 0.000 claims description 5
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 claims description 5
- 235000004279 alanine Nutrition 0.000 claims description 5
- 235000013922 glutamic acid Nutrition 0.000 claims description 5
- 239000004220 glutamic acid Substances 0.000 claims description 5
- 235000014304 histidine Nutrition 0.000 claims description 5
- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 claims description 5
- 235000018977 lysine Nutrition 0.000 claims description 5
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 4
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229960001124 trientine Drugs 0.000 claims description 4
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 claims description 3
- 235000013905 glycine and its sodium salt Nutrition 0.000 claims description 3
- 239000004247 glycine and its sodium salt Substances 0.000 claims description 3
- 229940029258 sodium glycinate Drugs 0.000 claims description 3
- WUWHFEHKUQVYLF-UHFFFAOYSA-M sodium;2-aminoacetate Chemical compound [Na+].NCC([O-])=O WUWHFEHKUQVYLF-UHFFFAOYSA-M 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000002803 fossil fuel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- GZWNUORNEQHOAW-UHFFFAOYSA-M potassium;2-aminoacetate Chemical compound [K+].NCC([O-])=O GZWNUORNEQHOAW-UHFFFAOYSA-M 0.000 claims description 2
- BTAAXEFROUUDIL-UHFFFAOYSA-M potassium;sulfamate Chemical compound [K+].NS([O-])(=O)=O BTAAXEFROUUDIL-UHFFFAOYSA-M 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 235000001014 amino acid Nutrition 0.000 claims 5
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims 2
- 239000004475 Arginine Substances 0.000 claims 1
- 239000004471 Glycine Substances 0.000 claims 1
- ODKSFYDXXFIFQN-BYPYZUCNSA-P L-argininium(2+) Chemical compound NC(=[NH2+])NCCC[C@H]([NH3+])C(O)=O ODKSFYDXXFIFQN-BYPYZUCNSA-P 0.000 claims 1
- 150000001413 amino acids Chemical class 0.000 claims 1
- 235000009697 arginine Nutrition 0.000 claims 1
- ODKSFYDXXFIFQN-UHFFFAOYSA-N arginine Natural products OC(=O)C(N)CCCNC(N)=N ODKSFYDXXFIFQN-UHFFFAOYSA-N 0.000 claims 1
- 150000002191 fatty alcohols Chemical class 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract description 7
- 238000011069 regeneration method Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 4
- 125000000637 arginyl group Chemical class N[C@@H](CCCNC(N)=N)C(=O)* 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- HVMVALNFYKDDMM-VYFHOAEYSA-L (2S)-2-aminopentanedioate 1-butyl-3-methylimidazol-3-ium Chemical compound CCCCn1cc[n+](C)c1.CCCCn1cc[n+](C)c1.N[C@@H](CCC([O-])=O)C([O-])=O HVMVALNFYKDDMM-VYFHOAEYSA-L 0.000 description 1
- GYDNNJQLBOPSBD-UHFFFAOYSA-N 1-butyl-3-methylimidazolidine Chemical compound CCCCN1CCN(C)C1 GYDNNJQLBOPSBD-UHFFFAOYSA-N 0.000 description 1
- JOTQIXXCBHIDKJ-UHFFFAOYSA-N 1-ethyl-3-methylimidazolidine Chemical compound CCN1CCN(C)C1 JOTQIXXCBHIDKJ-UHFFFAOYSA-N 0.000 description 1
- PBOCMQKRBQPNAJ-UHFFFAOYSA-N 1-hexyl-3-methylimidazolidine Chemical compound CCCCCCN1CCN(C)C1 PBOCMQKRBQPNAJ-UHFFFAOYSA-N 0.000 description 1
- MHOLKVWYAHYCFV-UHFFFAOYSA-N 1-methyl-3-octylimidazolidine Chemical compound CCCCCCCCN1CCN(C)C1 MHOLKVWYAHYCFV-UHFFFAOYSA-N 0.000 description 1
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- DVTRRYWFKKZCIE-UHFFFAOYSA-M 2-aminoacetate;1-ethyl-3-methylimidazol-3-ium Chemical compound NCC([O-])=O.CC[N+]=1C=CN(C)C=1 DVTRRYWFKKZCIE-UHFFFAOYSA-M 0.000 description 1
- NSIPIFOSWBFRGU-ZSCHJXSPSA-N N[C@@H](CCCCN)C(=O)O.C(CCCCC)N1CN(C=C1)C Chemical compound N[C@@H](CCCCN)C(=O)O.C(CCCCC)N1CN(C=C1)C NSIPIFOSWBFRGU-ZSCHJXSPSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/204—Amines
- B01D2252/20415—Tri- or polyamines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/205—Other organic compounds not covered by B01D2252/00 - B01D2252/20494
- B01D2252/2053—Other nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/50—Combinations of absorbents
- B01D2252/504—Mixtures of two or more absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
Abstract
The invention relates to a polyamine organic amine and ionic liquid composite CO 2 An absorbent, a preparation method and application thereof. The CO is 2 The absorbent is prepared by mixing active components such as polyamino organic amine, ionic liquid and the like and a solvent, and when the absorbent is used, the absorbent and CO-containing components are mixed 2 The mixed gas is fully contacted to complete absorption, and the liquid obtained by absorption is heated or stripped to complete desorption, so that the gas can be regenerated and reused. The invention provides composite CO 2 The absorbent has the advantages of high absorption rate, large circulation capacity, low regeneration energy consumption, low circulation loss and the like, and can maintain high CO even after repeated regeneration 2 The absorption rate and the absorption capacity, and has better application prospect.
Description
Technical Field
The invention relates to gas separation and CO 2 The technical field of trapping, in particular to a poly-amino organic amine and ionic liquid composite CO 2 An absorbent, a preparation method and application thereof.
Background
Climate change due to "carbon emissions" has become a worldwide problem. 2016, 4/22/100 countries and regions, including China, have jointly signed Paris' agreement in New York. Under this vision, carbon capture utilization and sequestration technology (CCS) is becoming one of the important ways to achieve carbon neutralization goals in various countries.
In the process of absorbing and trapping carbon dioxide by using a solvent, the alcohol amine method in the chemical absorption method is the most widely applied and most studied technology at present. The method has the advantages of large absorption capacity, good absorption effect, low cost, recyclable absorbent, and capability of recovering high-purity CO 2 And the like, however, how to reduce the energy consumption cost of the desorption process and how to regenerate the solvent is still very critical. Therefore, whether the alcohol amine method carbon dioxide trapping technology with low cost can be realized has very important significance for industrial development and environmental protection in China.
CO common to industry at present 2 The absorbent is mostly aqueous alcohol amine absorbent, however, the specific heat of water is high, so that a large amount of energy is used for raising the temperature of water in the desorption process, and the high regeneration temperature of the alcohol amine absorbent also causes high energy consumption. In addition, the alcohol amine absorbent is easy to volatilize and absorbs CO 2 And in the solvent regeneration process, a large amount of alcohol amine is volatilized and escapes, so that a large amount of material loss is caused. If the water content in the absorption liquid can be effectively reduced and an absorbent with lower regeneration temperature and difficult volatilization is adopted, the reduction of CO is facilitated 2 Energy, material and cost in the trapping process. Therefore, a method which has low regeneration energy consumption, low loss and CO resistance is sought 2 Absorbents having a prominent trapping effect have been the focus of research.
Disclosure of Invention
One purpose of the invention is to provide a polyamine organic amine and ionic liquid composite CO 2 An absorbent comprising at least 3 components: polyamine organic amine, ionic liquid and solvent.
Further, the polyamino organic amine is selected from at least one of diethylenetriamine and triethylene tetramine.
Further, the ionic liquid is selected from at least one of 1-ethyl-3-methylimidazolidine (or glutamic acid, alanine, histidine, lysine, arginine) salt ionic liquid, 1-butyl-3-methylimidazolidine (or glutamic acid, alanine, histidine, lysine, arginine) salt ionic liquid, 1-hexyl-3-methylimidazolidine (or glutamic acid, alanine, histidine, lysine, arginine) salt ionic liquid, 1-octyl-3-methylimidazolidine (or glutamic acid, alanine, histidine, lysine, arginine) salt ionic liquid, sodium glycinate, potassium glycinate and potassium sulfamate.
Further, the solvent is selected from at least one of water and aliphatic alcohol, wherein the aliphatic alcohol comprises ethanol, isopropanol, butanol, pentanol, octanol, glycol and the like.
Further, the total mass concentration of the polyamino organic amine and the ionic liquid in the absorbent is 0.2-6.0mol/L, and the mass ratio of the polyamino organic amine to the ionic liquid is x: (1-x), x is more than or equal to 1 and less than or equal to 9.
The second purpose of the invention is to provide the above poly-amino organic amine and ionic liquid composite CO 2 The preparation method of the absorbent comprises the following specific steps: preparing raw materials according to a formula, mixing the polyamine organic amine with the ionic liquid, adding a part of solvent to completely dissolve the polyamine organic amine, and finally adding the rest solvent to stir uniformly.
The third purpose of the invention is to provide a method for separating CO by using the polyamino organic amine and the ionic liquid composite absorbent 2 The method comprises the following steps: will contain CO 2 The gas to be treated is fully contacted with the compound absorbent for absorption to obtain the treated gas and rich liquid, and the rich liquid is regenerated and then repeatedly absorbed.
Furthermore, the absorption temperature is not more than 55 ℃, and the absorption pressure is 1-2bar.
Further, the gas to be treated is specifically pure carbon dioxide gas, fossil fuel power plant flue gas, automobile exhaust, chemical synthesis gas, steel plant exhaust, lime kiln gas and all containing CO 2 The gas of (2).
Further, CO in the gas to be treated 2 The volume fraction of (A) is 1% to 100%.
Further, the pregnant solution is desorbed and regenerated by heating or stripping, the desorption temperature is 70-130 ℃, and the desorption pressure is 0.8-1.2bar.
Compared with the alcohol amine absorbent mainly used in the existing industry, the compound absorbent provided by the invention contains the ionic liquid with low volatility and low regeneration temperature, so that the material loss is low; the energy consumption in the desorption process is lower than that of the existing alcohol amine absorbent, so that CO is generated 2 The trapping cost is low. Even after repeated multiple times of cyclic absorption-desorption, the catalyst still has better CO 2 And (4) absorption effect. In addition, the prior industrially commonly used alcohol amine absorbent is mainly monoethanolamine, diethanolamine or triethanolamine, the organic amines only contain one amino group, and the invention adopts the organic amine containing a plurality of amino groups, thereby having higher absorption capacity compared with the prior alcohol amine absorbent.
Detailed Description
In order to make those skilled in the art fully understand the technical solutions and advantages of the present invention, the following embodiments are further described.
Example 1
8.50g of diethylenetriamine and 1.94g of sodium glycinate were added to a 100mL beaker, and 50mL of a mixture of butanol and water (V) Alcohol(s) /V Water (W) = 1), stirring to completely dissolve the components, transferring the obtained mixture into a 100mL volumetric flask, performing volume fixing by using a butanol aqueous solution of 1.
CO was carried out by using an apparatus shown in CN113842748A or CN113842749A 2 In the adsorption experiment, the water bath temperature is stabilized at 40 ℃, N with the flow of 121mL/min is introduced into the absorption device under normal pressure 2 And 20mL/min CO 2 . CO in portable infrared gas analyzer 2 After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through an injector for adsorption. Calculating to know CO 2 The absorption rate is 8.60 mmol/s.m 2 And the level of the conventional absorbent is reached.
And (3) blowing nitrogen at normal pressure, desorbing and regenerating the absorbed rich solution for 1h at 90 ℃ by using a device shown in CN113842748A or CN113842749A, wherein the desorption rate is 85% by calculation.
The regenerated solution is absorbed again under the same conditions, and the absorption-desorption is repeated 4 timesThen, the calculated absorption rate still reaches 8.55 mmol/s.m 2 。
Example 2
7.31g of triethylene tetramine and 21.27g of 1-butyl-3-methylimidazolium glutamate ionic liquid are added into a 100mL beaker, and then ethylene glycol aqueous solution (V) is added Alcohol(s) /V Water (W) And 4), stirring to completely dissolve, transferring the obtained mixture into a 100mL volumetric flask, and carrying out constant volume by using the aqueous solution and shaking up to obtain a compound absorbent product.
CO was carried out by using an apparatus shown in CN113842748A or CN113842749A 2 In the adsorption experiment, the water bath temperature is stabilized at 30 ℃, N with the flow rate of 150mL/min is introduced into an absorption device under normal pressure 2 And 25mL/min CO 2 . CO in portable infrared gas analyzer 2 After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through an injector for adsorption. Calculating to know CO 2 The absorption rate is 9.13 mmol/s.m 2 And has higher absorption rate.
And (3) blowing nitrogen at normal pressure, desorbing and regenerating the absorbed rich solution at 93 ℃ for 40 minutes by using a device shown in CN113842748A or CN113842749A, wherein the desorption rate is 87% by calculation.
After the absorption rich solution is subjected to absorption-desorption circulation for 5 times, the absorption rate still reaches 9.05 mmol/s.m 2 The description will be given of the ability to be recycled.
Example 3
Adding 7.40g of triethylene tetramine, 5.90g of diethylenetriamine and 9.27g of 1-ethyl-3-methylimidazolium glycinate ionic liquid into a 50mL beaker, and adding an ethanol water solution (V) Alcohol(s) /V Water (W) And (4) = 7) constant volume shaking up to obtain a compound absorbent product.
CO was carried out by using an apparatus shown in CN113842748A or CN113842749A 2 In the adsorption experiment, the water bath temperature is stabilized at 30 ℃, N with the flow rate of 140mL/min is introduced into an absorption device under normal pressure 2 And 25mL/min CO 2 . CO in portable infrared gas analyzer 2 After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through an injectorAnd (4) carrying out adsorption. Calculating to know CO 2 The absorption rate is 12.09 mmol/s.m 2 This indicates that the absorbent has a higher absorption rate.
And (3) blowing nitrogen at normal pressure, desorbing and regenerating the absorbed rich solution at 100 ℃ for 50 minutes by using a device shown in CN113842748A or CN113842749A, wherein the desorption rate is 85.5 percent by calculation.
After the absorption pregnant solution is subjected to absorption-desorption circulation for 5 times, the absorption rate still reaches 11.98 mmol/s.m 2 This indicates that the absorbent does have the ability to be recycled.
Example 4
11.80g of diethylenetriamine, 10.10g of 1-ethyl-3-methylimidazol alanine salt and 15.61g of 1-hexyl-3-methylimidazol lysine salt ionic liquid are added into a 100mL beaker, and then ethylene glycol aqueous solution (V) Alcohol(s) /V Water (W) And (6) fixing the volume and shaking up to obtain a compound absorbent product.
CO was carried out by using an apparatus shown in CN113842748A or CN113842749A 2 In the adsorption experiment, the water bath temperature is stabilized at 50 ℃, N with the flow rate of 90mL/min is introduced into the absorption device under normal pressure 2 And 16mL/min CO 2 . CO in portable infrared gas analyzer 2 After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through an injector for adsorption. Calculating to know CO 2 The absorption rate was 9.21 mmol/s.m 2 This indicates that the absorbent has a higher absorption rate.
And (3) purging with nitrogen at normal pressure, desorbing and regenerating the absorbed rich solution at 105 ℃ for half an hour by using a device shown in CN113842748A or CN113842749A, wherein the desorption rate is 90.2% by calculation.
After the absorption rich solution is subjected to absorption-desorption circulation for 4 times, the absorption rate still reaches 9.18 mmol/s.m 2 This indicates that the absorbent has the ability to be recycled.
Claims (8)
1. Polyamine-based organic amine and ionic liquid composite CO 2 An absorbent characterized by: the absorbent comprises at least 3 components: polyamine-based organic amine and ionic liquidThe organic amine with polyamine group is selected from at least one of diethylenetriamine and triethylene tetramine; the ionic liquid is at least one selected from 1-ethyl-3-methylimidazole amino acid salt ionic liquid, 1-butyl-3-methylimidazole amino acid salt ionic liquid, 1-hexyl-3-methylimidazole amino acid salt ionic liquid, 1-octyl-3-methylimidazole amino acid salt ionic liquid, sodium glycinate, potassium glycinate and potassium sulfamate, and the amino acid is specifically one selected from glycine, glutamic acid, alanine, histidine, lysine and arginine; the solvent is at least one of water and fatty alcohol; the aliphatic alcohol comprises ethanol, isopropanol, butanol, pentanol, octanol and glycol.
2. The absorbent of claim 1, wherein: the total mass concentration of the polyamine-based organic amine and the ionic liquid is 0.2-6.0mol/L, and the mass ratio of the polyamine-based organic amine to the ionic liquid is x: (1-x), x is more than or equal to 1 and less than or equal to 9.
3. The polyamino organic amine, ionic liquid composite CO according to any one of claims 1 to 2 2 A process for the preparation of an absorbent, characterized in that the process comprises the steps of: preparing raw materials according to a formula, mixing the polyamine organic amine with the ionic liquid, adding a part of solvent to completely dissolve the polyamine organic amine, and finally adding the rest solvent and stirring uniformly.
4. CO separation by absorption with the absorbent according to any of claims 1-2 2 The method of (2), characterized in that the method comprises the steps of: will contain CO 2 The gas to be treated is fully contacted with the compound absorbent for absorption to obtain the treated gas and rich liquid, and the rich liquid is regenerated and then repeatedly absorbed.
5. The method of claim 4, wherein: the absorption temperature is not more than 55 deg.C, and the absorption pressure is 1-2bar.
6. The method of claim 4The method is characterized in that: the gas to be treated is CO-containing gas such as pure carbon dioxide gas, flue gas of fossil fuel power plant, automobile tail gas, chemical synthesis gas, tail gas of steel plant, lime kiln gas, etc 2 Of (2) is used.
7. The method of claim 4, wherein: CO in the gas to be treated 2 The volume fraction of (A) is 1% to 100%.
8. The method of claim 4, wherein: the pregnant solution is desorbed and regenerated by heating or stripping, the desorption temperature is 70-130 deg.C, and the desorption pressure is 0.8-1.2bar.
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| CN116272259A (en) * | 2023-03-28 | 2023-06-23 | 四川精事达科技有限公司 | Desulfurization and decarbonization solvent suitable for low-pressure gas and application thereof |
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