CN113842749A - Alcohol amine and ionic liquid composite CO2Absorbent, preparation method and application thereof - Google Patents
Alcohol amine and ionic liquid composite CO2Absorbent, preparation method and application thereof Download PDFInfo
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- CN113842749A CN113842749A CN202111127209.0A CN202111127209A CN113842749A CN 113842749 A CN113842749 A CN 113842749A CN 202111127209 A CN202111127209 A CN 202111127209A CN 113842749 A CN113842749 A CN 113842749A
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- 239000002608 ionic liquid Substances 0.000 title claims abstract description 33
- -1 Alcohol amine Chemical class 0.000 title claims abstract description 12
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000002250 absorbent Substances 0.000 claims abstract description 26
- 230000002745 absorbent Effects 0.000 claims abstract description 26
- 239000003463 adsorbent Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000003795 desorption Methods 0.000 claims abstract description 15
- 238000011069 regeneration method Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000008929 regeneration Effects 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims abstract description 5
- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 35
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000002803 fossil fuel Substances 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 25
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 abstract 1
- 229940031098 ethanolamine Drugs 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000012047 saturated solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005903 acid hydrolysis reaction Methods 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- B01D53/1425—Regeneration of liquid 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
- B01D2252/20478—Alkanolamines
- B01D2252/20484—Alkanolamines with one hydroxyl group
-
- 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
- B01D2252/20478—Alkanolamines
- B01D2252/20489—Alkanolamines with two or more hydroxyl groups
-
- 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
- B01D2252/30—Ionic liquids and zwitter-ions
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to alcohol amine and ionic liquid composite CO2An absorbent, a preparation method and application thereof. The adsorbent is formed by mixing ionic liquid, ethanolamine and water, wherein the total concentration of the ionic liquid and the ethanolamine is 0.2-2.5mol/L, and the molar ratio of the ionic liquid to the ethanolamine is 1:9-9: 1. The ionic liquid is selected from [ C2mim][Gly]、[C4mim][Gly]、[Aemim][Br]The ethanolamine is selected from monoethanolamine, diethanolamine and N-methyldiethanolamine. Directly mixing the absorbent with CO during adsorption2The gas is contacted at 10-60 deg.C and 1-2bar pressure, and the rich liquid obtained by adsorption can be heated, decompressed, flashed or stripped at 70-130 deg.C and 0.8-1bar pressure to complete regeneration and reuse. The absorbent provided by the invention can obviously improve CO2The capture rate of the catalyst is high, and the CO in the mixed gas is rapidly and efficiently captured under the condition of low energy consumption2The preparation, use and regeneration processes of the adsorbent are simple, the operation conditions are easy to control even in the processMultiple cycle absorption-desorption of CO2Then still maintain higher CO2Absorption rate and solubility.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to alcohol amine and ionic liquid composite CO2An absorbent, a preparation method and application thereof.
Background
The global warming caused by greenhouse effect is increasingly serious, the attention of the whole world is attracted, the emission reduction of carbon dioxide is not slow, and the carbon neutralization becomes the subject of the development of the domestic and foreign economic society. For CO in industrial waste gas2Capture and conversion are carried out to reduce CO2The development of green economy of emission becomes a main direction of industrial development in the future.
The organic amine absorption method in the existing carbon capture technology is the most common, but the method has the defects of serious equipment corrosion, high toxicity, easy escape of organic amine, high regeneration energy consumption and the like, so that the improvement of the existing absorption liquid is urgently needed, and the development of a carbon dioxide absorbent with higher efficiency, environmental protection and energy saving is more needed. Industrial treatment of CO2Usually, a single ethanolamine is used to absorb CO2Large-area volatilization waste and pollution are easily caused; using ionic liquid aqueous solution as CO singly2The trapping agent has the defects of low absorption rate, high cost and the like, thereby limiting the use of the ionic liquid aqueous solution in CO trapping2Practical industrial application in (1).
The invention adopts the ionic liquidBased on the mixed solution of the ethanol amine, the CO with excellent performance is prepared2An absorbent.
Disclosure of Invention
The invention aims to provide alcohol amine and ionic liquid composite CO2The absorbent is formed by mixing ionic liquid, ethanolamine and water, wherein the total concentration of the ionic liquid and the ethanolamine is 0.2-2.5mol/L, and the molar ratio of the ionic liquid to the ethanolamine is 1:9-9: 1.
Further, the total concentration of the ionic liquid and the ethanolamine in the adsorbent is preferably 1.0mol/L, and the molar ratio of the ionic liquid to the ethanolamine is preferably 1: 9.
Further, the ionic liquid is selected from [ C2mim][Gly]、[C4mim][Gly]、[Aemim][Br]Any one of them.
Further, the ethanolamine is selected from any one of Monoethanolamine (MEA), Diethanolamine (DEA), and N-Methyldiethanolamine (MDEA).
The second objective of the present invention is to provide a preparation method of the absorbent, which comprises the following specific processes: according to the stoichiometric ratio, the ionic liquid, the ethanolamine and the water are uniformly mixed.
The invention also aims to provide a method for absorbing CO in the mixed gas by using the adsorbent2The method comprises the following specific processes: at 10-60 deg.C and 1-2bar, the mixture will contain CO2The mixed gas is contacted with the adsorbent, and the adsorbed adsorbent is reused after regeneration.
Further, CO in the mixed gas2The volume fraction of (A) is 3-90%.
Further, the mixed gas is one of pure carbon dioxide gas, fossil fuel power plant flue gas, automobile exhaust, chemical synthesis gas, coal-fired power plant flue gas and lime kiln gas.
Further, the contact adsorption time is 0.5-5 h.
Furthermore, the regeneration mode of the adsorbent comprises at least one of heating, decompression, flash evaporation and steam stripping, the regeneration desorption temperature is 70-130 ℃, the pressure is 0.8-1bar, and the time is within 0.5 h.
Compared with the prior art, the beneficial effects of the invention are embodied in the following aspects: (1) develops a novel alcohol amine and ionic liquid composite CO2The absorbent solves the existing CO2The problems of high toxicity, serious volatilization, high regeneration temperature and high regeneration energy consumption and the like of the alcohol amine absorbent are generally existed; (2) the absorbent has the absorption rate and the absorption capacity equivalent to those of MEA with the same concentration, and can be repeatedly regenerated and reused, thereby not only avoiding environmental pollution, but also reducing the use cost; (3) the absorbent provided by the invention not only has low desorption temperature (70-120 ℃) but also has high desorption rate, and can reach desorption balance within about 0.5h, even if the absorbent circularly absorbs and desorbs CO for multiple times2Then still maintain higher CO2Absorption rate and solubility.
Drawings
FIG. 1 is a CO of the present invention2A schematic view of an absorption apparatus;
FIG. 2 is a CO of the present invention2Schematic diagram of desorption apparatus.
Wherein 1-nitrogen cylinder; 2-CO2A steel cylinder; 3. 4-a gas phase control valve; 5. 6-a rotameter; 7-a buffer bottle; 8-double-kettle stirrer; 9. 10-a transmission; 11. 12-a transmission; 13. 14-a liquid phase control valve; 15-super constant temperature water bath; 16-a rotational speed controller; 17-drying the bottle; 18-three-way valve; 19-a flow meter; 20-portable infrared gas analyzer; 21-constant temperature heating magnetic stirrer; 22-a desorber; 23-a syringe; 24-thermometer: 25-serpentine condenser tube; 26-spherical condenser tubes; 27-CO2A dryer; 28-saturated sodium bicarbonate solution; 29-measuring cylinder.
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.
CO used in the examples of the invention2The absorption and desorption devices are respectively shown in figures 1-2. FIG. 1 shows an absorption apparatus, nitrogen and CO2Mixed and buffered by a gas cylinder, and then enters a reactor 8 for CO2Absorbed by the absorbent and then enters a drying bottle 17 to remove a small amount of water carried out, and thenA portable infrared gas analyzer 20 and a soap film flowmeter 19 are connected.
FIG. 2 shows a CO absorption evaluation apparatus2The saturated solution is desorbed in a desorber 22, the obtained gas is cooled by two condensing pipes 25 and 26, the obtained water vapor is cooled and flows back into the desorber 22, the cooled gas coming out of the top of the desorber is further dried by a dryer 27 to remove water and then enters a saturated sodium bicarbonate solution for absorption, and the saturation degree and desorption average rate of the saturated solution are calculated by analyzing the change of the saturated sodium bicarbonate solution before and after absorption.
Example 1
7.410g of [ C ]2mim][Gly]5.665g of MEA is added into a 100mL beaker, diluted by water and transferred into a 100mL volumetric flask for constant volume, and the absorbent product is obtained after shaking up.
CO was carried out using an apparatus as shown in FIG. 12In the adsorption experiment, the water bath temperature is stabilized at 30 ℃, N with the flow rate of 100mL/min is introduced into a double-kettle stirrer under normal pressure2And 25mL/min CO2. CO in portable infrared gas analyzer2After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through an injector for adsorption, and CO is calculated according to the formula (1)2Absorption rate:
in the above formula, the A-gas-liquid interface contact area is 0.00136m2；G1-inlet gas flow rate, mol/s; g2-the outlet gas flow rate, mol/s; y is1CO in the intake air2The molar content; y is2CO in the exhaust gas2And (3) the molar content.
In order to reduce the CO2Absorbing the error caused by the total pressure change of the system, and utilizing N in calculation2Calculating the total mass of the discharged gas according to the characteristic that the mass of the discharged gas is unchanged before and after absorption. When the pressure (P) and temperature (T) of the absorption process are known, the molar flow rate G of the intake air can be determined from the ideal gas equation using the measured volume flow rate of the intake air1(ii) a Due to nitrogenThe gas does not participate in the absorption reaction, and the mole number of the gas is not changed before and after the gas enters and exits, so that the total molar flow (G) of the gas discharged at any moment can be calculated according to the content of the nitrogen in the gas discharged at any moment2) Then, the reaction rate was calculated according to the formula (1). From this calculation, CO in example 1 was calculated2Has an absorption rate of 3.5 mmol/s.m2。
And (3) purging with nitrogen at normal pressure, desorbing and regenerating the absorbed rich solution at 90 ℃ for 30 minutes by using a desorption device shown in the figure 2, and calculating according to the formula (2) to obtain the desorption rate of 98%.
In the above formula,. eta. -desorption rate (%); v1CO produced during acid hydrolysis of the resulting barren solution2Volume, mL; V-CO from acid hydrolysis of saturated solutions2Volume, mL.
After repeating the above adsorption-regeneration process 5 times, the adsorbent after regeneration was measured to have an absorption rate of 3.45 mmol/s.m2Left and right. In consideration of experimental errors, it is considered that the absorption rate of the adsorbent hardly changes, and the chemical absorption capacity and solubility do not change.
Example 2
9.384g of [ C ]4mim][Gly]10.750g of MEA is added into a 100mL beaker, diluted by water and transferred into a 100mL volumetric flask for constant volume, and the absorbent product is obtained after shaking up.
CO was carried out using an apparatus as shown in FIG. 12In the adsorption experiment, the water bath temperature is stabilized at 30 ℃, N with the flow rate of 100mL/min is introduced into a double-kettle stirrer under normal pressure2And 25mL/min CO2. CO in portable infrared gas analyzer2After the content is stable, 40mL of the prepared absorbent is injected into a double-kettle stirrer through a syringe for adsorption, and the calculated absorption rate is 5.2 mmol/s.m2。
The absorbed rich solution was regenerated at 90 ℃ for 30 minutes by using a desorption apparatus shown in FIG. 2 under a nitrogen purge at normal pressure, and the desorption rate was calculated to be 97%.
In conclusion, the ionic liquid selected by the adsorbent is different from the reports in the prior art, and the mixed liquid of the ionic liquid and the alcohol amine is adopted to absorb CO2The combined absorbent is different from the compositions of various alcohol amine + ionic liquid absorbents which are publicly reported in the literature. The application provides a composite CO2The absorption rate of the absorbent is slightly inferior to that of Monoethanolamine (MEA) alone but superior to that of diethanolamine or N-methyldiethanolamine alone, and the absorption rate and absorption capacity are slightly better than those of the common ionic liquid + alkanolamine absorbents. The composite CO2The greatest advantage of the absorbent is that it has a lower desorption temperature and is more energy efficient than MEA, DEA, TEA, etc.
Claims (10)
1. Alcohol amine and ionic liquid composite CO2An absorbent characterized by: the CO is2The adsorbent is formed by mixing ionic liquid, ethanolamine and water, wherein the total concentration of the ionic liquid and the ethanolamine is 0.2-2.5mol/L, and the molar ratio of the ionic liquid to the ethanolamine is 1:9-9: 1.
2. The CO of claim 12An adsorbent characterized by: the total concentration of the ionic liquid and the ethanolamine is 1.0mol/L, and the molar ratio of the ionic liquid to the ethanolamine is 1: 9.
3. The CO of claim 12An adsorbent characterized by: the ionic liquid is selected from [ C2mim][Gly]、[C4mim][Gly]、[Aemim][Br]Any one of them.
4. The CO of claim 12An adsorbent characterized by: the ethanolamine is selected from one of monoethanolamine, diethanolamine and N-methyldiethanolamine.
5. The alcohol amine, ionic liquid composite CO of claim 12A process for the preparation of an absorbent, characterized in that the process comprises the steps of: mixing the ionic liquid, ethanolamine and water according to the stoichiometric ratioAnd (5) uniformly mixing.
6. The alcohol amine and ionic liquid composite CO of claim 12The absorbent absorbs CO in the mixed gas2Characterized in that the method comprises the steps of: at 10-60 deg.C and 1-2bar, the mixture will contain CO2The mixed gas is contacted with the adsorbent, and the adsorbed adsorbent is reused after regeneration.
7. The method of claim 6, wherein: CO in mixed gas2The volume fraction of (A) is 3-90%.
8. The method of claim 6, wherein: the mixed gas is one of pure carbon dioxide gas, fossil fuel power plant flue gas, automobile tail gas, chemical synthesis gas, coal-fired power plant flue gas and lime kiln gas.
9. The method of claim 6, wherein: the contact adsorption time is 0.5-5 h.
10. The method of claim 6, wherein: the regeneration mode of the adsorbent comprises at least one of heating, decompression, flash evaporation and steam stripping, wherein the regeneration desorption temperature is 70-130 ℃, the pressure is 0.8-1bar, and the time is within 0.5 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111127209.0A CN113842749A (en) | 2021-09-26 | 2021-09-26 | Alcohol amine and ionic liquid composite CO2Absorbent, preparation method and application thereof |
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| CN202111127209.0A CN113842749A (en) | 2021-09-26 | 2021-09-26 | Alcohol amine and ionic liquid composite CO2Absorbent, preparation method and application thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170216A (en) * | 2013-03-13 | 2013-06-26 | 上海锅炉厂有限公司 | Alcohol amine type ion liquor-containing compound absorbent capable of capturing carbon dioxide |
| CN105289207A (en) * | 2015-10-09 | 2016-02-03 | 西安交通大学 | Triethanolamine compound amine absorbent for capturing carbon dioxide |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170216A (en) * | 2013-03-13 | 2013-06-26 | 上海锅炉厂有限公司 | Alcohol amine type ion liquor-containing compound absorbent capable of capturing carbon dioxide |
| CN105289207A (en) * | 2015-10-09 | 2016-02-03 | 西安交通大学 | Triethanolamine compound amine absorbent for capturing carbon dioxide |
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