CN102600715A - Method for absorbing carbon dioxide by using mixed solution containing ionic liquid - Google Patents

Method for absorbing carbon dioxide by using mixed solution containing ionic liquid Download PDF

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CN102600715A
CN102600715A CN201210090677XA CN201210090677A CN102600715A CN 102600715 A CN102600715 A CN 102600715A CN 201210090677X A CN201210090677X A CN 201210090677XA CN 201210090677 A CN201210090677 A CN 201210090677A CN 102600715 A CN102600715 A CN 102600715A
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ionic liquid
mixed solution
liquid mixed
molar fraction
equalizing pressure
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CN102600715B (en
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雷志刚
韩敬莉
代成娜
张本凤
乞晓曦
陈标华
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Beijing University of Chemical Technology
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Abstract

The invention relates to a method for absorbing carbon dioxide by using mixed solution containing ionic liquid, belonging to the technical field of carbon dioxide treatment. The mixed solution is mixed solution of ionic liquid A and ionic liquid B, or mixed solution of ionic liquid A or ionic liquid B and organic solvent C, wherein cations in the ionic liquid A are N, N-dialkyl imidazole cations and anions in the ionic liquid A are tetrafluoroborate radical anions, hexafluorophosphate radical anions or chloride ions; cations in the ionic liquid B are N, N-dialkyl imidazole cations and anions in the ionic liquid B are trifluoromethyl sulfamide anions; and the organic solvent C is methanol or acetone. The method comprises the steps of adding mixed solution containing the ionic liquid into a reaction kettle, vacuum pumping, feeding in CO2, keeping absorbing temperature to be 10-80 DEG C, agitating for absorption, and keeping CO2 balance pressure to be 0.01-10Mpa. The method for absorbing carbon dioxide by using mixed solution containing ionic liquid has the advantages that the solubility and the selectivity are higher and the defects of high volatility and high toxicity caused by a reason that pure organic solvent is used can be overcome at the same time.

Description

A kind of method that contains ion liquid mixed solution absorbing carbon dioxide
Technical field
The present invention relates to the method that a kind of employing in the chemical field contains ion liquid mixed solution absorbing carbon dioxide, belong to the carbon dioxide treatment technical field.
Background technology
The increase of atmosphere percent of greenhouse gases is the immediate cause that causes climate warming.Wherein, The great amount of carbon dioxide that fossil fuel produces is to cause the main source of greenhouse effects, therefore in order to reduce because of carbon dioxide content increases various natural calamities and the environmental pollution that causes, and just must be with carbon dioxide absorption; Enrichment becomes safe, nontoxic, abundant C resource.The absorption of carbon dioxide is a problem common in the chemical industry.At present, the absorption process of carbon dioxide has the Physical Absorption method, membrane absorption method, and air separation/exhaust-recirculation method, methods such as chemical absorption method, each method respectively has its characteristics and application.Minority is carried out commercial CO now 2The coal-fired plant of catching all uses MEA as carbon-dioxide absorbent.Problems such as but MEA has corrosivity, and organic amine absorbent exists volatile, is corrosive, and absorptivity is low, simultaneously itself vapour pressure is bigger, in the absorption process of carbon dioxide, is formed with organic compounds, causes environmental pollution.Simultaneously this method also need be used main equipment, and only is in slightly to the middle pressure just effective at carbon dioxide.Therefore, in view of cost, efficient, not very desirable.
Ionic liquid is a kind of novel medium and the functional material that is made up of certain cationic and anion fully; Because it has low volatility; Advantages such as good conduction and thermal conductivity, high thermal stability, ion liquid research receives the extensive concern of countries in the world scientific research and business circles.In recent years, a series of researchs show that ionic liquid has good absorption CO 2Ability, CO 2Absorption in ionic liquid belongs to physical process, CO 2Be easy to desorption recovery from ionic liquid, this has just solved the conventional organic solvents high volatile volatile causes in the existing carbon dioxide absorption technology equipment corrosion and complicated post processing problem.At present existing ionic liquid captures CO as absorbent 2Patent report: the method for having reported a kind of alkali ionic liquid capturing carbon dioxide like CN102151468 (2010).CN101468308 (2007) but reported supported ionic liquid adverse selection absorbing carbon dioxide material and preparation method thereof.The patent that relates to ionic liquid absorbing carbon dioxide technology abroad has US6579343 (2003), US7527775 (2009), and US0266230 (2009), US0251558 (2006), US0129598 (2005), therefore, ionic liquid is at CO 2Absorption process has favorable industrial application prospect; But the research that contains ion liquid mixed solution absorbing carbon dioxide is also few; CN101700454 (2009) has reported a kind of alkali ionic liquid and the composite aqueous solution absorbing carbon dioxide of organic amine; Absorption pressure is 0.1atm to 10atm, has limited the absorption pressure of carbon dioxide, limited by practical.
Summary of the invention
The purpose of this invention is to provide and a kind ofly contain ion liquid mixed solution at CO 2The application of absorption aspect.
Technical scheme of the present invention is following:
A kind of method that contains ion liquid mixed solution absorbing carbon dioxide; It is characterized in that; Contain the mixed solution that ion liquid mixed solution is ionic liquid A and ionic liquid B, or the mixed solution of ionic liquid A or ionic liquid B and organic solvent C, wherein the cation of ionic liquid A is N; N-dialkylimidazolium cation, anion are tetrafluoroborate anion, hexafluoro-phosphate radical anion or chlorion; The cation of ionic liquid B is N, and N-dialkylimidazolium cation, anion are trifluoromethyl sulphamide anion.Organic solvent C is methyl alcohol or acetone.The quality percentage composition of the mixed solution intermediate ion liquid A of ionic liquid A and ionic liquid B is 10-90%, and the quality percentage composition of the organic solvent C in the mixed solution of ionic liquid A or ionic liquid B and organic solvent C is 10-90%; May further comprise the steps: contain in the ion liquid mixed solution adding agitated reactor above-mentioned, be evacuated to vacuum, in agitated reactor, feed CO 2, absorption temperature is 10 ℃-80 ℃, stirs to absorb; The equalizing pressure scope of carbon dioxide is 0.01Mpa-10Mpa; After reaching stream-liquid phase balance, take out liquid phase and parse CO 2, containing ion liquid mixed solution can recycle.
In the present invention; The method that contains ion liquid mixed solution absorbing carbon dioxide is a Physical Absorption; After the parsing, solution system can be recycled, and such pressure limit that contains ion liquid mixed solution absorbing carbon dioxide is 0.01MPa to 10Mpa; The absorption pressure scope is big, contains ion liquid mixed solution and absorbs CO 2Not only have pure ionic liquid and absorb CO 2Advantage: energy consumption is low, Heat stability is good, chemically stable, non-volatility or low volatility do not pollute the environment etc. basically, also have following advantage simultaneously: ionic liquid and ionic liquid can through hybrid modulation its at CO 2Solubility in the gas separation process and selectivity improve separative efficiency; Ionic liquid mixes the comprehensively advantage of the two with organic solvent: ionic liquid non-volatility, CO 2Solubility big than in ionic liquid in organic solvent; Improve CO 2Absorbent properties, and then can improve CO 2Solubility in this mixed solution has the characteristics of recycle and green economy property.
The specific embodiment
The present invention explains with following instance, but the present invention is not limited to following embodiment, before and after not breaking away from, under the scope of said aim, changes and implements to be included in the technical scope of the present invention.
Embodiment 1: in piston magnetic stirring form agitated reactor, add 40ml at 40 ℃ and contain ion liquid mixed solution, [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 8.65Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.12Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.2001; When equalizing pressure is 3.41Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5095; When equalizing pressure is 5.52Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.6831.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 1.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1857; When equalizing pressure is 4.12Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5002; When equalizing pressure is 5.38Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5750.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 1.19Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1609; When equalizing pressure is 4.03Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4405; When equalizing pressure is 5.51Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5154.
Embodiment 2: in piston magnetic stirring form agitated reactor, add 40ml at 40 ℃ and contain ion liquid mixed solution, [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 8.90Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.13Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.2200; When equalizing pressure is 3.32Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5245; When equalizing pressure is 5.39Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.6931.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 1.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2057; When equalizing pressure is 4.10Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5202; When equalizing pressure is 5.12Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5750.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 1.20Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1810; When equalizing pressure is 4.02Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4605; When equalizing pressure is 5.13Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5154.
Embodiment 3: in piston magnetic stirring form agitated reactor, add 40ml at 60 ℃ and contain ion liquid mixed solution, [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 7.32Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.21Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.1700; When equalizing pressure is 4.28Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4562; When equalizing pressure is 5.32Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5198.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 1.22Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1308; When equalizing pressure is 4.03Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3519; When equalizing pressure is 5.49Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4135.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 1.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1201; When equalizing pressure is 4.09Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3200; When equalizing pressure is 5.48Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3765.
Embodiment 4: in piston magnetic stirring form agitated reactor, add 40ml at 60 ℃ and contain ion liquid mixed solution, [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 7.69Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.30Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.1975; When equalizing pressure is 4.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4865; When equalizing pressure is 5.68Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.6109.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 1.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1588; When equalizing pressure is 4.02Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4253; When equalizing pressure is 5.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5602.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF 4] -[OMIM] +[Tf 2N] -Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 1.21Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1355; When equalizing pressure is 4.34Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4152; When equalizing pressure is 5.46Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5018.
Embodiment 5: in piston magnetic stirring form agitated reactor, add 40ml at 40 ℃ and contain ion liquid mixed solution, [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 20% and 80%, is evacuated to vacuum, uses the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 9.86Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.12Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0568; When equalizing pressure is 4.60Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2653; When equalizing pressure is 6.08Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3978.
Change the proportioning of ionic liquid mixed solution, make [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 50% and 50%, and other conditions are constant, and the result shows, when equalizing pressure is 1.19Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0817; When equalizing pressure is 4.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2843; When equalizing pressure is 6.23Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4346.
Change the proportioning of ionic liquid mixed solution, make [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 80% and 20%, and other conditions are constant, and the result shows, when equalizing pressure is 1.28Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.1012; When equalizing pressure is 4.12Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3170; When equalizing pressure is 6.10Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4414.
Embodiment 6: in piston magnetic stirring form agitated reactor, add 40ml at 60 ℃ and contain ion liquid mixed solution, [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 20% and 80%, is evacuated to vacuum, uses the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 8.97Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 0.80Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0334; When equalizing pressure is 4.93Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2193; When equalizing pressure is 6.20Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2868.
Change the proportioning of ionic liquid mixed solution, make [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 50% and 50%, and other conditions are constant, and the result shows, when equalizing pressure is 1.31Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0705; When equalizing pressure is 4.45Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2211; When equalizing pressure is 6.15Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2972.
Change the proportioning of ionic liquid mixed solution, make [OMIM] +[Tf 2N] -And CH 3The mass fraction of OH is respectively 80% and 20%, and other conditions are constant, and the result shows, when equalizing pressure is 0.63Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0517; When equalizing pressure is 4.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2727; When equalizing pressure is 6.25Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3367.
Embodiment 7: in piston magnetic stirring form agitated reactor, add 40ml at 25 ℃ and contain ion liquid mixed solution, [EMIM] +[BF 4] -And CH 3COCH 3Mass fraction be respectively 10% and 90%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 7.65Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 0.52Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0955; When equalizing pressure is 2.51Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4421; When equalizing pressure is 3.54Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.6200.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 20% and 80%, other conditions are constant, the result shows, when equalizing pressure is 0.53Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0887; When equalizing pressure is 1.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2646; When equalizing pressure is 2.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4278.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 0.60Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0792; When equalizing pressure is 1.55Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2011; When equalizing pressure is 2.54Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3208.
Embodiment 8: in piston magnetic stirring form agitated reactor, add 40ml at 40 ℃ and contain ion liquid mixed solution, [EMIM] +[BF 4] -And CH 3COCH 3Mass fraction be respectively 10% and 90%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 6.24Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 0.52Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0689; When equalizing pressure is 2.50Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3431; When equalizing pressure is 3.57Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4862.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 20% and 80%, other conditions are constant, the result shows, when equalizing pressure is 0.54Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0608; When equalizing pressure is 2.04Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2491; When equalizing pressure is 3.03Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3813.
Change the proportioning of ionic liquid mixed solution, make [EMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 0.54Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0526; When equalizing pressure is 2.00Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1981; When equalizing pressure is 3.00Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2983.
Embodiment 9: in piston magnetic stirring form agitated reactor, add 40ml at 25 ℃ and contain ion liquid mixed solution, [BMIM] +[BF 4] -And CH 3COCH 3Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 8.79Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 0.50Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.0940; When equalizing pressure is 2.10Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3875; When equalizing pressure is 3.13Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5572.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 0.80Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1334; When equalizing pressure is 2.20Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3866; When equalizing pressure is 3.40Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5371.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 0.78Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1193; When equalizing pressure is 2.20Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3285; When equalizing pressure is 3.36Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4690.
Embodiment 10: in piston magnetic stirring form agitated reactor, add 40ml at 40 ℃ and contain ion liquid mixed solution, [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 7.96Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.01Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.1427; When equalizing pressure is 2.96Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3975; When equalizing pressure is 4.03Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.5298.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 0.52Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0695; When equalizing pressure is 3.25Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4283; When equalizing pressure is 4.02Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4948.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 0.53Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0680; When equalizing pressure is 3.18Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3606; When equalizing pressure is 4.17Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4569.
Embodiment 11: in piston magnetic stirring form agitated reactor, add 40ml at 60 ℃ and contain ion liquid mixed solution, [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 20% and 80%, be evacuated to vacuum, use the single cylinder syringe pump in agitated reactor, to feed CO 2Absorb to 7.51Mpa, rotating speed 400r/min stirs 2h pressure and tends to be balanced, and shows that the ionic liquid mixed solution absorbs CO 2Reached balance, closed stirring, got liquid phase analysis, the result shows, when equalizing pressure is 1.10Mpa, and CO 2Molar fraction in this ionic liquid mixed solution is 0.1154; When equalizing pressure is 3.38Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3606; When equalizing pressure is 4.86Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4755.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 50% and 50%, other conditions are constant, the result shows, when equalizing pressure is 1.02Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.1086; When equalizing pressure is 3.47Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3369; When equalizing pressure is 4.55Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.4329.
Change the proportioning of ionic liquid mixed solution, make [BMIM] +[BF4] -And CH 3COCH 3Mass fraction be respectively 80% and 20%, other conditions are constant, the result shows, when equalizing pressure is 1.02Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.0977; When equalizing pressure is 3.48Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.2901; When equalizing pressure is 4.47Mpa, CO 2Molar fraction in this ionic liquid mixed solution is 0.3728.

Claims (3)

1. method that contains ion liquid mixed solution absorbing carbon dioxide; It is characterized in that; Contain the mixed solution that ion liquid mixed solution is ionic liquid A and ionic liquid B, or the mixed solution of ionic liquid A or ionic liquid B and organic solvent C, wherein the cation of ionic liquid A is N; N-dialkylimidazolium cation, anion are tetrafluoroborate anion, hexafluoro-phosphate radical anion or chlorion; The cation of ionic liquid B is N; N-dialkylimidazolium cation; Anion is a trifluoromethyl sulphamide anion; Organic solvent C is methyl alcohol or acetone, and the quality percentage composition of the mixed solution intermediate ion liquid A of ionic liquid A and ionic liquid B is 10-90%, and the quality percentage composition of the organic solvent C in the mixed solution of ionic liquid A or ionic liquid B and organic solvent C is 10-90%; May further comprise the steps: contain in the ion liquid mixed solution adding agitated reactor above-mentioned, vacuumize, in agitated reactor, feed CO 2, absorption temperature is 10 ℃-80 ℃, stirs to absorb.
2. according to the method for claim 1, it is characterized in that, further comprising the steps of: as after reaching stream-liquid phase balance, to take out liquid phase and parse CO 2, containing ion liquid mixed solution can recycle.
3. according to the method for claim 1, it is characterized in that the equalizing pressure scope of carbon dioxide is 0.01Mpa-10Mpa.
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CN105617819A (en) * 2016-02-29 2016-06-01 北京化工大学 Method for absorbing carbon dioxide in synthesis gas at low temperature with ionic liquid
CN105642096A (en) * 2016-01-11 2016-06-08 神华集团有限责任公司 Room-temperature ionic liquid as well as method and device for removing sulfur dioxide and carbon dioxide in tail gas
CN108786377A (en) * 2018-06-19 2018-11-13 中国地质大学（北京） A method of utilizing mixed ionic liquid sulfur dioxide absorption
CN108883392A (en) * 2016-03-24 2018-11-23 大阪瓦斯株式会社 The manufacturing method of carbon-dioxide absorbent and carbon-dioxide absorbent
CN113265282A (en) * 2021-06-11 2021-08-17 郑州轻工业大学 CO in natural gas separated from mixed ionic liquid2Method (2)
CN113350977A (en) * 2021-06-11 2021-09-07 清华大学 Coupling membrane separation device for absorbing and separating acid gas from mixed gas

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CN102179132A (en) * 2011-03-24 2011-09-14 浙江大学 Absorbent for catching or separating dioxide carbon

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CN102179132A (en) * 2011-03-24 2011-09-14 浙江大学 Absorbent for catching or separating dioxide carbon

Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN105642096A (en) * 2016-01-11 2016-06-08 神华集团有限责任公司 Room-temperature ionic liquid as well as method and device for removing sulfur dioxide and carbon dioxide in tail gas
CN105642096B (en) * 2016-01-11 2018-04-03 神华集团有限责任公司 The method and device of ionic liquid at room temperature, removing sulfur dioxide in tail gas and carbon dioxide
CN105617819A (en) * 2016-02-29 2016-06-01 北京化工大学 Method for absorbing carbon dioxide in synthesis gas at low temperature with ionic liquid
CN108883392A (en) * 2016-03-24 2018-11-23 大阪瓦斯株式会社 The manufacturing method of carbon-dioxide absorbent and carbon-dioxide absorbent
CN108786377A (en) * 2018-06-19 2018-11-13 中国地质大学（北京） A method of utilizing mixed ionic liquid sulfur dioxide absorption
CN113265282A (en) * 2021-06-11 2021-08-17 郑州轻工业大学 CO in natural gas separated from mixed ionic liquid2Method (2)
CN113350977A (en) * 2021-06-11 2021-09-07 清华大学 Coupling membrane separation device for absorbing and separating acid gas from mixed gas

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