CN108854465A - The method that amido ionic liquid and ethanol amine are blended in absorbing carbon dioxide in microchannel - Google Patents

The method that amido ionic liquid and ethanol amine are blended in absorbing carbon dioxide in microchannel Download PDF

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Publication number
CN108854465A
CN108854465A CN201810759950.0A CN201810759950A CN108854465A CN 108854465 A CN108854465 A CN 108854465A CN 201810759950 A CN201810759950 A CN 201810759950A CN 108854465 A CN108854465 A CN 108854465A
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carbon dioxide
liquid
ethanol amine
ionic liquid
absorbent
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CN108854465B (en
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雷志刚
马维华
高慧
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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
    • B01D53/18Absorbing units; Liquid distributors therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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
    • B01D53/1456Removing acid components
    • B01D53/1475Removing carbon dioxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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
    • B01D53/1493Selection of liquid materials for use as absorbents
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2

Abstract

The method that amido ionic liquid and ethanol amine are blended in absorbing carbon dioxide in microchannel belongs to absorption and separation technical field.The operating condition of micro passage reaction is:25 DEG C of temperature, pressure 1atm, carbon dioxide and absorbent are respectively delivered to gas access and liquid inlet according to the speed set, and gas and liquid flow to identical, and gas-liquid two-phase comes into full contact in microchannel, and carbon dioxide is absorbed;The mass ratio of amido ionic liquid and ethanol amine is preferably 1 in absorbent:9-3:7.Gas phase velocity variation range is 0.0187-0.187ms‑1, liquid velocity variation range is 0.0285-0.285ms‑1.It can be recycled after absorbing the absorbent desorption of carbon dioxide.Effectively solve energy consumption problem and problem of environmental pollution.

Description

The method that amido ionic liquid and ethanol amine are blended in absorbing carbon dioxide in microchannel
Technical field
The present invention relates to the amido ionic liquid in micro passage reaction and ethanol amine mixed solution absorbing carbon dioxides Method.Absorbent is the mixed solution of amido ionic liquid and ethanol amine, and used amido ionic liquid is 1- amine ethyl -3- Methyl imidazolium tetrafluoroborate.Belong to absorption and separation technical field.
Background technique
Carbon dioxide is caused as main greenhouse gases mainly from coal-burning power plant and industrial excessive emissions The Global Greenhouse Effect got worse, this problem receive significant attention in the whole world.Meanwhile carbon dioxide is a kind of safety, easily The carbon resource obtained, has a wide range of applications in life.Therefore, implement the trapping of carbon dioxide, utilization and storage are most important. There is the method for the excessively a lot of other absorbing carbon dioxides of document report, for example, physisorphtion, is based on carbon dioxide gas and to inhale Intermolecular attraction on attached dose of face between active site is realized.The method process flow is simple, low energy consumption, high reliablity, environment The advantages that profitable, but adsorbent is to the poor selectivity of carbon dioxide, the recovery efficiency of carbon dioxide is low, adsorption capacity is limited etc. Disadvantage limits the extensive functionization of the technology;Chemical absorption method is chemically reacted by chemical solvent and carbon dioxide The compound of weak stability is generated, then is desorbed under conditions of heating or decompression, to realize the separation of carbon dioxide in flue gas The method of recycling.According to the difference of absorbent, chemical absorption method mainly includes:Ammonium hydroxide absorption process, Amine Solutions absorption process Deng.Volatility is big in use for ammonium hydroxide, strong to the corrosion of equipment, and equipment is difficult to ensure using safe, and be easy to cause ring The secondary pollution in border.Amine Solutions regeneration is difficult, and regeneration energy consumption is big.For this reason, it may be necessary to which develop a kind of can meet high-selenium corn simultaneously Rate and high-selenium corn load, low energy consumption, low-corrosiveness, low volatility absorbent and absorption process.It is several since ionic liquid is nontoxic It is non-volatile, have many advantages, such as good chemical stability and thermal stability, amido ionic liquid and ethanol amine are used in mixed way, In conjunction with the advantages of two kinds of solvents, a kind of absorption rate height is formed, load capacity is strong, can be recycled, volatility is low, the absorption that low energy consumption Agent.
In conclusion a kind of device is simple, energy consumption is lower, and the high device of absorbability is necessary.The present invention uses Amido ionic liquid and ethanol amine mixed solution absorbing carbon dioxide, rich carbonated absorbent can heated or depressurized Under conditions of desorb, so as to be recycled.This method completes the process of absorbing carbon dioxide in micro passage reaction, Since its pressure drop is small, large specific surface area, the advantages such as reaction volume is small can greatly improve mass-transfer efficiency, reduce industrial cost, have Effect solves energy consumption problem and problem of environmental pollution.
Summary of the invention
The object of the present invention is to provide the mixed solutions of amido ionic liquid and ethanol amine to absorb in micro passage reaction The method of carbon dioxide, this method, as absorbent, remove industrial object using the mixed solution of amido ionic liquid and ethanol amine Carbon dioxide in material, and absorbent can be recycled by desorption.
The present invention proposes amido ionic liquid and ethanol amine mixed solution absorbing carbon dioxide in micro passage reaction The operating condition of method, micro passage reaction is:25 DEG C of temperature, pressure 1atm, carbon dioxide and absorbent are according to setting Speed is respectively delivered to gas access and liquid inlet, and gas and liquid flow to identical, and gas-liquid two-phase sufficiently connects in microchannel Touching, carbon dioxide are absorbed;The mass ratio of amido ionic liquid and ethanol amine is preferably 1 in absorbent:9-3:7;Microchannel The preferred 1.5mm-3mm of diameter;Gas phase velocity variation range is 0.0187-0.187ms-1, liquid velocity variation range is 0.0285-0.285m·s-1;Gas phase flow rate variation range is 20-120mLmin-1, the liquid phase changes in flow rate range of absorbent For 50-400mLh-1;The length 30-50cm of micro passage reaction can be recycled after absorbing the absorbent desorption of carbon dioxide It uses;
Carbon dioxide in material can significantly be removed by being compared using the technology of this kind of method absorbing carbon dioxide with conventional method, The carbonated absorbent of richness flowed out from reactor is desorbed under conditions of heating or decompression, and removing wherein contains Carbon dioxide, re-start carbon dioxide absorption.
It can be recycled after absorbing the absorbent desorption of carbon dioxide.In traditional industry, carbon dioxide absorption mistake Cheng Tongchang is carried out in packed tower, the large scale equipments such as plate column, and at high cost, absorption efficiency is low.In contrast, micro passage reaction As a kind of process strengthening reactor, the flow pattern of fluid is controllable, and different flow patterns can be formed by adjusting conditions such as flow velocitys;It is logical Fluid volume very little in road, therefore mass transfer, reaction time are than very fast;The specific surface area of microchannel is very high, if there is heat between fluid Amount generates the cracking release of meeting, avoids hot-spot phenomenon, can greatly improve mass-transfer efficiency.With traditional carbon dioxide absorption Agent is compared, and the mixed solution of amido ionic liquid and ethanol amine is big to the absorptive capacity of carbon dioxide, and desorption energy consumption is lower, can be followed Ring uses, not volatile, effectively solves energy consumption problem and problem of environmental pollution.
Detailed description of the invention
Fig. 1 is the process flow chart of amido ionic liquid and ethanol amine mixed solution carbon dioxide removal under normal temperature and pressure. Wherein, 1 is CO2Steel cylinder;2 be pressure reducing valve;3 be mass flowmenter;4 be absorbent storage tank;5 be pump;6 be micro passage reaction;7 For phase separator;8 be gas-chromatography;9 be waste liquid bottle.
Specific embodiment
The present invention is illustrated using amido ionic liquid and ethanol amine mixed solution with following embodiment in micro passage reaction The effect of interior absorbing carbon dioxide, but the present invention is not limited to the following embodiments, under the range for not departing from the front and back objective, Alternate embodiment is included in technical scope of the invention.
As shown, carbon dioxide gas from steel cylinder after pressure reducing valve depressurizes using flowmeter, into microchannel plate Answer the gas access of device.Amido ionic liquid/ethanol amine mixed solution enters microchannel plate by storage tank under the transmission of peristaltic pump Answer the liquid inlet of device.Gas-liquid two-phase comes into full contact in microchannel, and carbon dioxide is absorbed.Gas-liquid mixture is from outlet stream Out, into phase separator, gas is flowed out from upper end, enters progress relative amount measurement in gas chromatograph, liquid is under End discharges into waste liquid bottle.It can be recycled after absorbing the absorbent desorption of carbon dioxide.Respectively in terms of simulation and experiment two The absorption of carbon dioxide is studied.
Embodiment 1
Absorption process as shown in the figure.The diameter of micro passage reaction is 2mm, length 30cm, and operating condition is:Temperature 25 DEG C, pressure 1atm, the mass ratio of amido ionic liquid and ethanol amine is 3 in absorbent:7.Carbon dioxide is as gas phase from gas Import enters, and gas phase flow rate is controlled in 20mLmin-1, amido ionic liquid and ethanol amine mixed solution are as absorbent from liquid Body import enters, and liquid phase flow is 200mLh-1, carbon dioxide eliminating rate is 0.953 at this time, illustrates to absorb using this kind of method For the technology of carbon dioxide with conventional method compared to can significantly remove carbon dioxide in material, what is flowed out from reactor is rich in dioxy The absorbent for changing carbon is desorbed under conditions of heating and decompression, removes the carbon dioxide wherein contained, desorption operations condition For:110 DEG C of temperature, pressure 1atm, time 2h, absorbent can be recycled.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.905.
Change gas phase flow rate is 120mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide Removal efficiency is 0.830.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 50mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.815.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 400mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.954.
Embodiment 2
Absorption process as shown in the figure.The diameter of micro passage reaction is 2mm, length 30cm, and operating condition is:Temperature 25 DEG C, pressure 1atm, the mass ratio of amido ionic liquid and ethanol amine is 2 in absorbent:8.Carbon dioxide is as gas phase from gas Import enters, and gas phase flow rate is controlled in 20mLmin-1, amido ionic liquid and ethanol amine mixed solution are as absorbent from liquid Body import enters, and liquid phase flow is 200mLh-1, carbon dioxide eliminating rate is 0.888 at this time, illustrates to absorb using this kind of method For the technology of carbon dioxide with conventional method compared to can significantly remove carbon dioxide in material, what is flowed out from reactor is rich in dioxy The absorbent for changing carbon is desorbed under conditions of heating and decompression, removes the carbon dioxide wherein contained, desorption operations condition For:110 DEG C of temperature, pressure 1atm, time 2h, absorbent can be recycled.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.844.
Change gas phase flow rate is 120mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide Removal efficiency is 0.733.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 50mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.729.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 400mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.899.
Embodiment 3
Absorption process as shown in the figure.The diameter of micro passage reaction is 2mm, length 30cm, and operating condition is:Temperature 25 DEG C, pressure 1atm, the mass ratio of amido ionic liquid and ethanol amine is 1 in absorbent:9.Carbon dioxide is as gas phase from gas Import enters, and gas phase flow rate is controlled in 20mLmin-1, amido ionic liquid and ethanol amine mixed solution are as absorbent from liquid Body import enters, and liquid phase flow is 200mLh-1, carbon dioxide eliminating rate is 0.821 at this time, illustrates to absorb using this kind of method For the technology of carbon dioxide with conventional method compared to can significantly remove carbon dioxide in material, what is flowed out from reactor is rich in dioxy The absorbent for changing carbon is desorbed under conditions of heating and decompression, removes the carbon dioxide wherein contained, desorption operations condition For:110 DEG C of temperature, pressure 1atm, time 2h, absorbent can be recycled.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.749.
Change gas phase flow rate is 120mLmin-1, liquid phase flow is 200mLh-1, other conditions are constant, carbon dioxide Removal efficiency is 0.664.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 50mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.613.
Change gas phase flow rate is 50mLmin-1, liquid phase flow is 400mLh-1, other conditions are constant, carbon dioxide de Except rate is 0.801.
Embodiment 4
Absorption process as shown in the figure.The diameter of micro passage reaction is 2mm, length 30cm, and operating condition is:Temperature 25 DEG C, pressure 1atm, the mass ratio of amido ionic liquid and ethanol amine is 3 in absorbent:7.Carbon dioxide is as gas phase from gas Import enters, and gas phase flow velocity is controlled in 0.0187ms-1, amido ionic liquid and ethanol amine mixed solution are as absorbent from liquid Body import enters, liquid phase flow rate 0.0285ms-1, the liquid Side Volume mass tranfer coefficient reacted at this time is 1.875s-1, explanation adopts Carbon dioxide in material can significantly be removed by being compared with the technology of this kind of method absorbing carbon dioxide with conventional method, from reactor The carbonated absorbent of richness of outflow is desorbed under conditions of heating and decompression, removes the titanium dioxide wherein contained Carbon, desorption operations condition are:110 DEG C of temperature, pressure 1atm, time 2h, absorbent can be recycled.
Change gas phase flow velocity is 0.0561ms-1, liquid phase flow rate 0.057ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 2.640s-1
Change gas phase flow velocity is 0.0748ms-1, liquid phase flow rate 0.114ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 3.827s-1
Change gas phase flow velocity is 0.112ms-1, liquid phase flow rate 0.171ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 4.757s-1
Change gas phase flow velocity is 0.150ms-1, liquid phase flow rate 0.228ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 5.522s-1
Change gas phase flow velocity is 0.187ms-1, liquid phase flow rate 0.285ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 6.193s-1
Embodiment 5
Absorption process as shown in the figure.The diameter of micro passage reaction changes 3mm, length 30cm into, and operating condition is:Temperature 25 DEG C, pressure 1atm, the mass ratio of amido ionic liquid and ethanol amine is 3 in absorbent:7.Carbon dioxide is as gas phase from gas Body import enters, and gas phase flow velocity is controlled in 0.0187ms-1, amido ionic liquid and ethanol amine mixed solution as absorbent from Liquid-inlet enters, liquid phase flow rate 0.0285ms-1, the liquid Side Volume mass tranfer coefficient reacted at this time is 1.302s-1, explanation Carbon dioxide in material can significantly be removed by being compared using the technology of this kind of method absorbing carbon dioxide with conventional method, but with micro- The increase of channel diameter, assimilation effect are deteriorated.The carbonated absorbent of richness flowed out from reactor is being heated and is being depressurized Under conditions of desorbed, remove the carbon dioxide that wherein contains, desorption operations condition is:110 DEG C of temperature, pressure 1atm, when Between be 2h, absorbent can be recycled.
Change gas phase flow velocity is 0.0561ms-1, liquid phase flow rate 0.057ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 1.834s-1
Change gas phase flow velocity is 0.0748ms-1, liquid phase flow rate 0.114ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 2.640s-1
Change gas phase flow velocity is 0.112ms-1, liquid phase flow rate 0.171ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 3.284s-1
Change gas phase flow velocity is 0.150ms-1, liquid phase flow rate 0.228ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 3.865s-1
Change gas phase flow velocity is 0.187ms-1, liquid phase flow rate 0.285ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 4.338s-1
Embodiment 6
Absorption process as shown in the figure.The diameter of micro passage reaction changes 1.5mm, length 30cm into, and operating condition is:Temperature 25 DEG C, pressure 1atm are spent, the mass ratio of amido ionic liquid and ethanol amine is 3 in absorbent:7.Carbon dioxide as gas phase from Gas feed enters, and gas phase flow velocity is controlled in 0.0187ms-1, amido ionic liquid and ethanol amine mixed solution are as absorbent Enter from liquid-inlet, liquid phase flow rate 0.0285ms-1, the liquid Side Volume mass tranfer coefficient reacted at this time is 2.429s-1, say The bright technology using this kind of method absorbing carbon dioxide is compared with conventional method can significantly remove carbon dioxide in material, but with The increase of microchannel diameter, assimilation effect are deteriorated.The carbonated absorbent of richness flowed out from reactor is heating and is subtracting It is desorbed under conditions of pressure, removes the carbon dioxide wherein contained, desorption operations condition is:110 DEG C of temperature, pressure 1atm, Time is 2h, and absorbent can be recycled.
Change gas phase flow velocity is 0.0561ms-1, liquid phase flow rate 0.057ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 3.485s-1
Change gas phase flow velocity is 0.0748ms-1, liquid phase flow rate 0.114ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 4.942s-1
Change gas phase flow velocity is 0.112ms-1, liquid phase flow rate 0.171ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 6.065s-1
Change gas phase flow velocity is 0.150ms-1, liquid phase flow rate 0.228ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 6.983s-1
Change gas phase flow velocity is 0.187ms-1, liquid phase flow rate 0.285ms-1, other conditions are constant, the liquid of reaction Side Volume mass tranfer coefficient is 7.772s-1

Claims (7)

1. the method for amido ionic liquid and ethanol amine mixed solution absorbing carbon dioxide, feature exist in micro passage reaction In the operating condition of micro passage reaction is:25 DEG C of temperature, pressure 1atm, carbon dioxide and absorbent are according to the speed set Degree is respectively delivered to gas access and liquid inlet, and gas and liquid flow to identical, and gas-liquid two-phase comes into full contact in microchannel, Carbon dioxide is absorbed;The mass ratio of amido ionic liquid and ethanol amine is preferably 1 in absorbent:9-3:7.
2. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that the preferred 1.5mm-3mm of the diameter of microchannel.
3. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that gas phase velocity variation range is 0.0187-0.187ms-1, liquid velocity variation range is 0.0285-0.285m·s-1
4. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that gas phase flow rate variation range is 20-120mLmin-1, the liquid phase changes in flow rate model of absorbent It encloses for 50-400mLh-1
5. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that be recycled after absorbing the absorbent desorption of carbon dioxide.
6. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that desorption operations condition is:110 DEG C of temperature, pressure 1atm.
7. the amido ionic liquid described in accordance with the claim 1 in micro passage reaction and ethanol amine mixed solution absorb dioxy Change the method for carbon, which is characterized in that the length 30-50cm of micro passage reaction.
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