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 PDFInfo
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- 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
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
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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