CN117695830B - Carbon dioxide low-temperature trapping absorption liquid and absorption method thereof - Google Patents
Carbon dioxide low-temperature trapping absorption liquid and absorption method thereof Download PDFInfo
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- CN117695830B CN117695830B CN202410153034.8A CN202410153034A CN117695830B CN 117695830 B CN117695830 B CN 117695830B CN 202410153034 A CN202410153034 A CN 202410153034A CN 117695830 B CN117695830 B CN 117695830B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 84
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 83
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 83
- 239000007788 liquid Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002608 ionic liquid Substances 0.000 claims abstract description 41
- 239000002270 dispersing agent Substances 0.000 claims abstract description 26
- 150000001412 amines Chemical class 0.000 claims abstract description 23
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 23
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 23
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 21
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 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
- 238000003756 stirring Methods 0.000 claims description 41
- 239000000203 mixture Substances 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 25
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical group CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000003607 modifier Substances 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 238000003795 desorption Methods 0.000 claims description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- -1 alkali metal salt Chemical class 0.000 claims description 9
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 claims description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 230000010355 oscillation Effects 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 8
- 229920000053 polysorbate 80 Polymers 0.000 claims description 8
- 238000003805 vibration mixing Methods 0.000 claims description 8
- 238000009775 high-speed stirring Methods 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 6
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 229920002873 Polyethylenimine Polymers 0.000 claims description 3
- 150000001263 acyl chlorides Chemical group 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims description 3
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims description 2
- LSHROXHEILXKHM-UHFFFAOYSA-N n'-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCN LSHROXHEILXKHM-UHFFFAOYSA-N 0.000 claims description 2
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 37
- 238000002360 preparation method Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical group [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 3
- WETWJCDKMRHUPV-UHFFFAOYSA-N acetyl chloride Chemical group CC(Cl)=O WETWJCDKMRHUPV-UHFFFAOYSA-N 0.000 description 3
- 239000012346 acetyl chloride Substances 0.000 description 3
- 238000007259 addition reaction Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000001632 sodium acetate Substances 0.000 description 3
- 235000017281 sodium acetate Nutrition 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 2
- PASDCCFISLVPSO-UHFFFAOYSA-N benzoyl chloride Chemical group ClC(=O)C1=CC=CC=C1 PASDCCFISLVPSO-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- CTSLXHKWHWQRSH-UHFFFAOYSA-N oxalyl chloride Chemical group ClC(=O)C(Cl)=O CTSLXHKWHWQRSH-UHFFFAOYSA-N 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 125000003275 alpha amino acid group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000010792 warming Methods 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/80—Organic bases or salts
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Gas Separation By Absorption (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of gas absorption and separation engineering, and discloses a carbon dioxide low-temperature trapping absorption liquid and an absorption method thereof, wherein the absorption liquid comprises the following components in parts by mass: 14-16 parts of modified ionic liquid, 6-9 parts of antioxidant dispersant, 10-20 parts of auxiliary agent and 30-40 parts of water. By adding organic amine and alkaline dispersant for compounding and modifying the ionic liquid, the trapping rate of carbon dioxide and the regeneration rate of the absorption liquid are improved, the absorption temperature and the regeneration temperature are low, and the energy consumption of regeneration is low; when the absorption liquid is used, carbon dioxide can be captured and absorbed in a circulating way through the low-temperature and electric pressurization effect, the loss of the absorption liquid is low, and the process energy consumption is low.
Description
Technical Field
The invention relates to the technical field of gas absorption and separation engineering, in particular to a carbon dioxide low-temperature trapping absorption liquid and an absorption method thereof.
Background
The global warming phenomenon is serious, the gradual rise of air temperature can lead the development of climate adaptation type to face more challenges, the discharge amount of greenhouse gases is too high as a main reason, and the measures adopted for relieving the environmental problems comprise the measures of selecting green energy sources for replacement and the like, wherein the control of the discharge of carbon dioxide is an effective measure, the energy sources such as petroleum, coal and the like still are main energy consumption raw materials at present, and the generated industrial waste gas contains a large amount of gases which are harmful to the environment such as carbon dioxide, sulfur dioxide and the like, so that the absorption and the capture of the carbon dioxide in the industrial waste gas are effective ways for controlling the discharge amount of the carbon dioxide;
the organic amine absorbs carbon dioxide as one of the main methods, and is the best method at present, the absorption capacity is large, the effect is good, but taking monoethanolamine as an example, the regeneration energy consumption in the carbon dioxide capturing process is high, the energy consumption in the process of capturing and absorbing carbon dioxide is reduced at present as one of the important research directions at present, when the carbon dioxide is absorbed and desorbed, the absorption rate and the desorption rate can be improved by increasing the temperature and time, and the purity of the carbon dioxide can be further improved, but the reaction energy consumption is obviously increased, the carbon dioxide capturing rate is reduced, the cost of capturing carbon dioxide is high, and therefore, the low-temperature carbon dioxide capturing absorption liquid with high capturing rate meets the actual industrial production requirement better.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a carbon dioxide low-temperature capturing absorption liquid and an absorption method thereof.
The technical content of the invention is as follows:
The invention provides a carbon dioxide low-temperature trapping absorption liquid, which comprises the following components in parts by mass: 14-16 parts of modified ionic liquid, 6-9 parts of antioxidant dispersant, 10-20 parts of auxiliary agent and 30-40 parts of water.
The modified ionic liquid is obtained by adding the ionic liquid into a solvent, uniformly stirring, then dropwise adding a modifier with the mass fraction of 24-28%, heating up and cooling down under the condition of introducing hydrogen, wherein the flow rate of the introduced hydrogen is 100-150sccm, the heating up temperature is 60-80 ℃, and the cooling down rate is 10-20 ℃/min, and continuously stirring;
The cation of the ionic liquid is organic amine, and the anion is lysine salt, wherein the organic amine is one of polyethyleneimine, dodecylprimary amine, tetradecyl primary amine, diethylenetriamine, tetraethylenepentamine and pentaethylenehexamine;
The solvent is polyethylene glycol, and the addition amount is 4-5 times of the volume multiple of the organic amine;
The modifier is a composition of acyl chloride compound and (3-oleophobic propyl) trimethoxy silane with the mass ratio of 8-10:5-7;
The modified ionic liquid carries out a modification reaction on organic amine, a hydrogen atmosphere can promote the reaction, wherein an acyl chloride compound and the organic amine carry out an addition reaction, alkyl and amino free radicals are increased, and the (3-oleophobic propyl) trimethoxy silane can provide silanol bonds to carry out an addition reaction with the organic amine as well, so that more basic groups are provided.
The antioxidant dispersant is a composition of alkali metal salt and sodium alkyl naphthalene sulfonate with the mass ratio of 6-9:11-13;
The antioxidation dispersing agent is compounded by alkali metal salt and sulfonate, and the negative ion of sulfonic acid group with negative charge is ionized to cooperate with the alkali metal salt to promote carbon dioxide to be trapped and dispersed, and metal carbonate is generated.
The auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 10-14:4-6.
The invention also provides a preparation method of the carbon dioxide low-temperature trapping absorption liquid, which comprises the following steps: step 1: adding the modified ionic liquid into an antioxidant dispersant, and carrying out ultrasonic vibration mixing for 40-60min to obtain a mixed liquid; step 2: adding the mixed solution into water, stirring at a low speed, and stirring at a high speed to obtain carbon dioxide low-temperature trapping absorption liquid;
the ultrasonic oscillation frequency is 10-20KHz;
The low-speed stirring is performed at a speed of 100-2000rpm for 10-20min, and the high-speed stirring is performed at a speed of 5000-8000rpm for 5-18min.
The ultrasonic vibration promotes sulfonate in the antioxidant dispersing agent and silanol bond in the modifier to be combined with alkaline amino in part of organic polyamine through physical energy, promotes the organic polyamine to stretch, fully exposes more absorption active sites, promotes the reaction of carbon dioxide and active sites of modified composite ions, and increases the reaction rate of modified ion solution and carbon dioxide.
The invention also provides an absorption method for capturing the absorption liquid at low temperature of carbon dioxide, wherein the absorption liquid is used for absorbing the gas containing carbon dioxide in an absorption tower, is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and is compressed under the condition of electric pressurization to obtain high-purity carbon dioxide gas;
the preheating is heating at 50-60deg.C for 30-50min;
the compression is performed at a pressure of 4.0atm to 7.0atm and a temperature of 30 to 40 ℃ for 20 to 30 minutes.
The beneficial effects are that: the carbon dioxide low-temperature trapping absorption liquid provided by the invention has the advantages that the vapor pressure for absorbing carbon dioxide is low, the carbon dioxide can be absorbed at normal temperature, the carbon dioxide is desorbed at a lower temperature, the temperature rising range is low, the heat energy consumption is low, the solvent loss is low, the energy consumption is low, the low trapping energy consumption of the carbon dioxide can be realized, the corrosion to process equipment is reduced due to the reduction of the heat energy, and the process cost is reduced.
According to the preparation method of the carbon dioxide absorption low-temperature trapping absorption liquid, the ionic liquid is subjected to modification treatment, so that the ionic liquid can be subjected to spin addition reaction to form active free radicals, high-energy trapping sites are increased, the activation energy is high, the carbon dioxide absorption reaction capacity is improved, the stability is high, the carbon dioxide trapping rate is high under the low-temperature condition, the antioxidation dispersing agent can fully disperse the modified ionic liquid, and the reaction point with the carbon dioxide is larger; the added auxiliary agent plays a role in defoaming, can be mutually dissolved with the aqueous solution, and reduces the evaporation heat of water.
The invention also provides an absorption method for capturing the absorption liquid at low temperature of the carbon dioxide, which can reduce volatilization of the absorption liquid and process heating energy consumption by absorbing the carbon dioxide at low temperature and desorbing the carbon dioxide by low temperature and electric pressurization.
Detailed Description
The application is described in further detail below with reference to specific examples, which are intended to be illustrative only and not to be limiting of the scope of the application, as various equivalent modifications to the application will fall within the scope of the appended claims, as will be appreciated by those skilled in the art upon reading the application.
All materials and reagents of the invention are materials and reagents of the conventional market unless specified otherwise.
Example 1
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 15 parts of modified ionic liquid into 7 parts of antioxidant dispersant and 15 parts of auxiliary agent, and carrying out ultrasonic vibration mixing for 50min to obtain mixed liquid; the ultrasonic oscillation frequency is 15KHz;
Adding dodecyl primary amine lysine salt ionic liquid into polyethylene glycol, uniformly stirring, wherein the adding amount is 4 times of the volume multiple of the organic amine, then dropwise adding a modifier with the mass fraction of 26%, and carrying out temperature rise and cooling reaction under the condition of introducing hydrogen to obtain the modified ionic liquid;
the modifier is a composition of benzoyl chloride and (3-oleophobic propyl) trimethoxy silane in a mass ratio of 9:6;
The flow rate of the introduced hydrogen is 125sccm, the temperature of the heating is 70 ℃, and the cooling rate is 15 ℃/min, and the mixture is obtained by continuously stirring;
The antioxidant dispersant is a composition of sodium acetate and sodium alkyl naphthalene sulfonate with the mass ratio of 8:12;
The auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 12:5;
Step 2: adding the mixed solution into 35 parts of water, stirring at a low speed, and stirring at a high speed to obtain a carbon dioxide low-temperature trapping absorption liquid; the low-speed stirring is stirring at a speed of 1000rpm for 15min, and the high-speed stirring is stirring at a speed of 6500rpm for 12min.
In an absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain high-purity carbon dioxide gas;
The preheating is heating at 55deg.C for 40min, and the compression is compressing at 35deg.C for 25min at 5.0 atm.
Example 2
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 14 parts of modified ionic liquid into 6 parts of antioxidant dispersant and 10 parts of auxiliary agent, and carrying out ultrasonic vibration mixing for 40min to obtain mixed liquid;
The ultrasonic oscillation frequency is 10KHz;
The modified ionic liquid is obtained by adding tetradecyl primary amine lysine salt ionic liquid into polyethylene glycol, uniformly stirring, wherein the addition amount is 4-times of the volume multiple of organic amine, then dropwise adding a modifier with the mass fraction of 24%, and carrying out temperature rise and cooling reaction under the condition of introducing hydrogen;
the modifier is acetyl chloride and (3-oleophobic propyl) trimethoxy silane with the mass ratio of 8:5; the flow rate of the introduced hydrogen is 100sccm, the temperature of the heating is 60 ℃, and the cooling rate is 10 ℃/min, and the hydrogen is obtained by continuously stirring;
the antioxidant dispersant is a composition of sodium tripolyphosphate and sodium alkyl naphthalene sulfonate with the mass ratio of 6:11;
the auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 10:4;
Step 2: adding the mixed solution into 30 parts of water, stirring at a low speed, and stirring at a high speed to obtain the carbon dioxide low-temperature trapping absorption liquid, wherein the stirring at the low speed is performed for 10min at a speed of 500rpm, and the stirring at the high speed is performed for 5min at a speed of 5000 rpm.
And in the absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, the gas is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain the high-purity carbon dioxide gas.
The preheating is heating at 50 ℃ for 30min, and the compressing is compressing at 4.0atm and 30 ℃ for 20min.
Example 3
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 9 parts of an antioxidant dispersant and 20 parts of an auxiliary agent into 16 parts of modified ionic liquid, and carrying out ultrasonic vibration mixing for 60min to obtain a mixed liquid; the ultrasonic oscillation frequency is 20KHz;
The antioxidant dispersant is a composition of sodium hexametaphosphate and sodium alkyl naphthalene sulfonate with the mass ratio of 9:13;
the auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 14:6;
The modified ionic liquid is prepared by adding a pentaethylene hexamine lysine salt ionic liquid into polyethylene glycol, stirring uniformly, wherein the addition amount is 4 times of the volume multiple of organic amine, then dropwise adding a modifier with the mass fraction of 28%, heating and cooling under the condition of introducing hydrogen, and the modifier is a composition of oxalyl chloride and (3-mercaptopropyl) trimethoxysilane with the mass ratio of 10:7; the flow rate of the introduced hydrogen is 150sccm, the temperature of the heating is 80 ℃, and the cooling rate is 20 ℃/min, so that the hydrogen is obtained by continuously stirring;
step 2: the mixed solution is added into 40 parts of water to be stirred at a low speed, and then stirred at a high speed, so that the carbon dioxide low-temperature trapping absorption liquid is obtained, wherein the low-speed stirring is carried out for 20min at a speed of 2000rpm, and the high-speed stirring is carried out for 18min at a speed of 8000 rpm.
And in the absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, the gas is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain the high-purity carbon dioxide gas.
The preheating is heating at 60 ℃ for 50min, and the compressing is compressing at 7.0atm and 40 ℃ for 30min.
Example 4
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 9 parts of an antioxidant dispersant and 10 parts of an auxiliary agent into 14 parts of modified ionic liquid, and carrying out ultrasonic vibration mixing for 60min to obtain a mixed liquid; the ultrasonic oscillation frequency is 10KHz;
The antioxidant dispersant is a composition of sodium acetate and sodium alkyl naphthalene sulfonate with the mass ratio of 6:13;
the auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 10:6;
The modified ionic liquid is prepared by adding diethylenetriamine lysine salt ionic liquid into polyethylene glycol, stirring uniformly, wherein the addition amount is 4 times of the volume multiple of organic amine, then dropwise adding a modifier with the mass fraction of 28%, heating and cooling under the condition of introducing hydrogen, and the modifier is a composition of acetyl chloride and (3-mercaptopropyl) trimethoxy silane with the mass ratio of 8:7; the flow of the introduced hydrogen is 100sccm, the temperature of the heating is 80 ℃, and the cooling rate is 10 ℃/min, and the mixture is obtained by continuously stirring;
step 2: adding the mixed solution into 30 parts of water, stirring at a low speed, and stirring at a high speed to obtain a carbon dioxide low-temperature trapping absorption liquid; the low-speed stirring is stirring at 2000rpm for 10min, and the high-speed stirring is stirring at 8000rpm for 5min.
And in the absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, the gas is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain the high-purity carbon dioxide gas.
The preheating is heating at 50 ℃ for 50min, and the compressing is compressing at 40 ℃ for 20min under the pressure of 4.0 atm.
Example 5
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 16 parts of modified ionic liquid into 6 parts of antioxidant dispersant and 20 parts of auxiliary agent, and carrying out ultrasonic vibration mixing for 40min to obtain mixed liquid;
the ultrasonic oscillation frequency is 20KHz;
the antioxidant dispersant is a composition of sodium tripolyphosphate and sodium alkyl naphthalene sulfonate with the mass ratio of 9:11;
The auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 14:4;
Step 2: adding the mixed solution into 40 parts of water, stirring at a low speed, and stirring at a high speed to obtain carbon dioxide low-temperature trapping absorption liquid; the low-speed stirring is performed at a speed of 1500rpm for 10min, and the high-speed stirring is performed at a speed of 7000rpm for 18min.
The modified ionic liquid is prepared by adding tetraethylenepentamine lysine salt ionic liquid into polyethylene glycol, stirring uniformly, wherein the addition amount is 5 times of the volume multiple of organic amine, then dropwise adding a modifier with the mass fraction of 24%, heating and cooling under the condition of introducing hydrogen, and the modifier is a composition of benzoyl chloride and (3-mercaptopropyl) trimethoxysilane with the mass ratio of 10:5; the flow rate of the introduced hydrogen is 150sccm, the temperature of the heating is 60 ℃, and the cooling rate is 20 ℃/min, and the mixture is obtained by continuously stirring;
And in the absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, the gas is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain the high-purity carbon dioxide gas.
The preheating is heating at 60 ℃ for 30min, and the compressing is compressing at 7.0atm and 30 ℃ for 30min.
Example 6
Preparation method of carbon dioxide low-temperature trapping absorption liquid
Step 1: adding 14 parts of modified ionic liquid into 8 parts of antioxidant dispersant and 10 parts of auxiliary agent, and carrying out ultrasonic vibration mixing for 50min to obtain mixed liquid;
The ultrasonic oscillation frequency is 15KHz;
The antioxidant dispersant is a composition of sodium hexametaphosphate and sodium alkyl naphthalene sulfonate with the mass ratio of 6:12;
the auxiliary agent is a composition of 1-propanol and tween-80 in a mass ratio of 12:4;
The modified ionic liquid is prepared by adding polyethylene imine lysine salt ionic liquid into polyethylene glycol, stirring uniformly, wherein the adding amount is 4 times of the volume multiple of organic amine, then dropwise adding a modifier with the mass fraction of 26%, heating and cooling under the condition of introducing hydrogen, and the modifier is a composition of acetyl chloride and (3-oleophobic propyl) trimethoxy silane with the mass ratio of 8:6; the flow rate of the introduced hydrogen is 125sccm, the temperature of the heating is 70 ℃, and the cooling rate is 15 ℃/min, and the mixture is obtained by continuously stirring;
Step 2: the mixed solution is added into 35 parts of water to be stirred at a low speed firstly and then at a high speed, so as to obtain the carbon dioxide low-temperature trapping absorption liquid, wherein the low-speed stirring is carried out at a speed of 1500rpm for 15min, and the high-speed stirring is carried out at a speed of 7500rpm for 5min.
And in the absorption tower, the obtained absorption liquid is used for absorbing the gas containing carbon dioxide, the gas is preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain the high-purity carbon dioxide gas.
The preheating is heating at 60 ℃ for 35min, and the compressing is compressing at 6.0atm and 35 ℃ for 25min.
Comparative example 1
Comparative example 1 differs from example 1 in that comparative example 1 does not treat the ionic liquid preparation with the addition of the modifier, and the others are unchanged.
Comparative example 2
Comparative example 2 differs from example 1 in that the organic amine in the modified ionic liquid of comparative example 2 is triethanolamine, the others being unchanged.
Comparative example 3
Comparative example 3 differs from example 1 in that the modifier of the modified ionic liquid of comparative example 3 is not added with an acid chloride compound, is replaced with an equivalent amount of (3-mercaptopropyl) trimethoxysilane, and is otherwise unchanged.
Comparative example 4
Comparative example 4 differs from example 1 in that the antioxidant dispersant of comparative example 4 was not added with sodium alkyl naphthalene sulfonate, replaced with an equivalent amount of sodium acetate, and the others were unchanged.
Comparative example 5
Comparative example 5 differs from example 1 in that the antioxidant dispersant of comparative example 5 was not added with a basic metal salt, was replaced with an equivalent amount of sodium alkylnaphthalene sulfonate, and the other was unchanged.
Comparative example 6
Comparative example 6 differs from example 1 in that comparative example 6 uses an equal amount of water instead of the auxiliary agent, the others being unchanged.
Comparative example 7
Comparative example 7 is different from example 1 in that in the absorption method of comparative example 7, the temperature of the absorption tower is 80 c and the others are unchanged.
Comparative example 8
Comparative example 8 is different from example 1 in that in the absorption method of comparative example 8, the absorption liquid is not compressed under the condition of electric pressurization, desorption treatment is performed by using hot steam, the temperature of the hot steam is 120 ℃, the treatment time is 2 hours, and the other is unchanged.
The results of the carbon dioxide absorption treatment in examples and comparative examples are shown in Table 1.
TABLE 1 carbon dioxide content (volume fraction)
| Group of experiments | Absorption tower | Absorption tower | Regeneration tower |
| Carbon dioxide content at the inlet | Carbon dioxide content at the outlet | Carbon dioxide content at the outlet | |
| Example 1 | 35% | 5% | 98% |
| Example 2 | 30% | 6% | 93% |
| Example 3 | 33% | 5% | 95% |
| Example 4 | 34% | 7% | 93% |
| Example 5 | 35% | 6% | 98% |
| Example 6 | 37% | 8% | 93% |
| Comparative example 1 | 34% | 20% | 75% |
| Comparative example 2 | 36% | 25% | 81% |
| Comparative example 3 | 34% | 24% | 83% |
| Comparative example 4 | 35% | 22% | 85% |
| Comparative example 5 | 36% | 22% | 80% |
| Comparative example 6 | 36% | 21% | 81% |
| Comparative example 7 | 35% | 5% | 85% |
| Comparative example 8 | 35% | 18% | 88% |
As can be seen from table 1, the carbon dioxide low-temperature trapping absorbent prepared by the invention has high carbon dioxide trapping rate;
As can be seen from comparative examples 1-3, the modified ionic liquid is modified, long-chain organic amine is selected as the cation of the ionic liquid to compound anions with amino acid structures, and a multi-active-group modifier is used for addition modification reaction, so that compared with the modified ionic liquid which is selected from other organic amines and is not modified, the carbon dioxide capturing rate of the prepared modified ionic liquid is higher;
from comparative examples 4 to 5, it is understood that the antioxidant dispersant of the present invention can synergistically promote capturing and dispersing carbon dioxide and produce metal carbonate;
as can be seen from comparative example 6, the auxiliary agent of the present invention can further enhance the capturing effect of the absorption liquid on carbon dioxide;
as is clear from comparative examples 7 to 8, the absorption liquid of the present invention is suitable for use in low temperature conditions, and the desorption process adopts electric pressurization to compress carbon dioxide, so that the recovery rate of carbon dioxide is high.
Claims (5)
1. The carbon dioxide low-temperature trapping absorption liquid is characterized by comprising the following components in parts by mass: 14-16 parts of modified ionic liquid, 6-9 parts of antioxidant dispersant, 10-20 parts of auxiliary agent and 30-40 parts of water;
The modified ionic liquid is obtained by adding the ionic liquid into a solvent, uniformly stirring, then dropwise adding a modifier with the mass fraction of 24-28%, heating up and cooling down under the condition of introducing hydrogen, wherein the flow rate of the introduced hydrogen is 100-150sccm, the heating up temperature is 60-80 ℃, and the cooling down rate is 10-20 ℃/min, and continuously stirring;
The modifier is a composition of acyl chloride compound and (3-oleophobic propyl) trimethoxy silane with the mass ratio of 8-10:5-7;
The antioxidant dispersant is a composition of alkali metal salt and sodium alkyl naphthalene sulfonate with the mass ratio of 6-9:11-13;
the cation of the ionic liquid is organic amine, and the anion is lysine salt;
wherein the organic amine is one of polyethylenimine, dodecylprimary amine, tetradecylprimary amine, diethylenetriamine, tetraethylenepentamine and pentaethylenehexamine;
The auxiliary agent is a composition of 1-propanol and tween-80 with the mass ratio of 10-14:4-6.
2. The carbon dioxide low-temperature trapping absorption liquid according to claim 1, wherein the solvent is polyethylene glycol, and the addition amount is 4-5 times of the volume multiple of the organic amine.
3. The method for producing a carbon dioxide low-temperature trapped absorption liquid according to any one of claims 1 to 2, comprising the steps of:
step 1: adding the modified ionic liquid into an antioxidant dispersant and an auxiliary agent, and carrying out ultrasonic vibration mixing for 40-60min to obtain a mixed liquid;
Step 2: adding the mixed solution into water, stirring at a low speed, and stirring at a high speed to obtain carbon dioxide low-temperature trapping absorption liquid;
the ultrasonic oscillation frequency is 10-20KHz;
The low-speed stirring is performed at a speed of 100-2000rpm for 10-20min, and the high-speed stirring is performed at a speed of 5000-8000rpm for 5-18min.
4. The method for absorbing carbon dioxide low-temperature trapping absorption liquid according to any one of claims 1 to 2, wherein the absorption method is that the absorption liquid is used for absorbing carbon dioxide-containing gas in an absorption tower, preheated by a lean-rich liquid heat exchanger, then enters a regeneration tower for desorption, and then the absorption liquid is compressed under the condition of electric pressurization to obtain high-purity carbon dioxide gas.
5. The method according to claim 4, wherein the preheating is heating at a temperature of 50-60 ℃ for 30-50min, and the compressing is compressing at a pressure of 4.0atm-7.0atm and a temperature of 30-40 ℃ for 20-30min.
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