KR20140139821A - Carbon Dioxide Absorbent Solution and Method for Absorbing And Exhausting Carbon Dioxide Using the Same - Google Patents

Abstract

The present invention relates to a carbon dioxide absorbent solution and a method for absorbing and separating carbon dioxide using the same, and more specifically, to a carbon dioxide absorbent solution which can reduce loss of the absorbent solution, can be reacted in a small amount of carbon dioxide, absorbs and desorbs carbon dioxide much carbon dioxide at low temperature and high temperature respectively, and can effectively absorb and regenerate carbon dioxide with compared to an existing process of heating and generating the entire absorbent solution, and to a method for absorbing and separating carbon dioxide using the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide absorbent solution and a carbon dioxide absorbing and separating method using the carbon dioxide absorbent solution.

The present invention relates to a carbon dioxide absorbent solution and a carbon dioxide absorbing and separating method using the carbon dioxide absorbent solution. More particularly, the present invention relates to a carbon dioxide absorbent solution capable of reducing the loss of an absorbent solution and capable of reducing a small amount of carbon dioxide, And more particularly to a carbon dioxide absorbent solution capable of absorbing and regenerating carbon dioxide even with a small amount of heat as compared with a conventional process of heating and regenerating the entire absorbent solution and a method of absorbing and separating carbon dioxide using the carbon dioxide absorbent solution.

GHG emissions such as CO ₂ , CH ₄ and NO ₂ have caused global warming due to the use of a wide range of fossil fuels for accelerated economic development and development since the Industrial Revolution, Has come.

Through multilateral consultations such as the Koyto Protocol, we are aware of the need for greenhouse gas reduction, a global issue, and are seeking solutions. As a part of this, the importance of carbon dioxide capture and storage (CCS) that isolates carbon dioxide, which has been attracting attention as a main cause of global warming, from the atmosphere has been emphasized. CCS for separating carbon dioxide has been widely used for absorption, An adsorption method, a membrane separation method, and a deep-cooling method.

Among them, the absorption method is a method of selectively removing carbon dioxide by contacting an exhaust gas containing carbon dioxide with an absorbent solution capable of absorbing carbon dioxide, and wet amines are a typical commercialization technique to date. The wet amination method is a liquid absorption solution, typically using an aqueous solution of MEA (monoethanolamine), and absorbs carbon dioxide through the following chemical reaction formula (1).

(Chemical reaction formula 1)

Here, MEA (monoethanolamine), which is the most representative alkanolamine-based absorbent of the wet amination method, is one of the first used absorbents for the purpose of separation and recovery of carbon dioxide, and since its molecular weight is small, , It has a relatively high molar concentration, which is advantageous in absorbing carbon dioxide due to the chemical reaction of the molar concentration ratio, and has high reactivity and low cost. However, since the loading capacity (mol _CO2 / mol _absorbent ) of the carbon dioxide absorbed per unit mol of the _absorbent is low and the volatility is high, there is a problem of device corrosion due to the absorbent during regeneration, ( Sep. Sci. Technol. 40 321, 2005 ), since the by-products and the solvent due to the decomposition of the absorbent during the regeneration process can be generated as impurities, the carbon dioxide is purely used There is a problem that it is difficult to use it as a carbon dioxide storage medium.

 Sep. Sci. Technol. 40 321, 2005

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to reduce the loss of an absorbent solution, and not only to a small amount of carbon dioxide, but also to absorb more carbon dioxide The present invention is to provide a carbon dioxide absorbent solution capable of absorbing and regenerating carbon dioxide even with a small amount of heat as compared with a conventional process of heating and regenerating the entire absorbent solution and a method of absorbing and separating carbon dioxide using the same.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

This object is achieved by a carbon dioxide absorbent solution characterized in that it comprises amidine, an organic alcohol and an organic solvent.

Here, the amidine is 1,8-diazabicyclooldec-7-ene (DBU), 1,5-diazabicyclo (4.3.0) non-5-ene (DBN) or formamidine .

Preferably, the formamidine is selected from the group consisting of N'-benzyl-N, N-dimethylformamidine, (1E, 1'E) -N'N'N''- (1,4-phenylenebis N ', N' '- (2,2', 2'-nitrilotris (ethane-2,1-diyl)) - tris (N, N-dimethylformimidamide), (1E, 1'E) -N ', N "- (ethane-1,2- N ', N "- (butane-1,4-diyl) bis (N, N-dimethylformimidamide).

Preferably, the organic alcohol is a polyol.

More preferably, the polyol is ethylene glycol or glycerol.

Preferably, the organic solvent is selected from the group consisting of tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidine And phenyl ether (DPE).

Preferably, the organic solvent is NMP, the amidine is DBU, and the organic alcohol is glycerol.

Preferably, the organic solvent is diphenyl ether, the amidine is DBU, and the organic alcohol is ethylene glycol.

Preferably, the concentration of the amidine and the organic alcohol in the organic solvent is 30% to 50%.

Preferably, the equivalent ratio of the organic alcohol to the amidine is 1.5 eq to 2 eq.

Preferably, the carbon dioxide absorbent solution is capable of quantitative phase transition as carbon dioxide is injected.

The above object is also achieved by a method of absorbing and separating carbon dioxide characterized in that a phase transferable absorbent solution is used.

Here, the solvent phase is moved in the phase-transition absorbent solution absorbing carbon dioxide.

Preferably, the method further comprises: a first step of absorbing carbon dioxide into the phase-transferable absorbent solution followed by a phase transition; a second step of moving the solvent phase of the phase-transition absorbent solution after completion of the phase transition to another site; A third step of moving the solvent phase and heating the phase consisting of remaining adimine, organic alcohol and carbon dioxide to separate the carbon dioxide; and a third step of separating the carbon dioxide from the amidine and the organic alcohol, And a fourth step of preparing the phase transferable absorbent solution by mixing the solvent phase transferred to another place of the two stages and mixing them again.

Preferably, the method further comprises: a first step of placing the phase transferable absorbent solution in one column and placing an image of only the adimine and organic alcohol in the other column; and a second step of absorbing carbon dioxide A third step of moving the solvent phase of the phase-transferable absorbent solution in which phase transformation of the one phase has been completed to the other column to produce a phase transferable absorbent solution; And a fourth step of heating the phase composed of organic alcohol and carbon dioxide to separate carbon dioxide, regenerating the absorbent, and absorbing carbon dioxide in the phase transferable absorbent solution of the other column, followed by phase transformation.

Preferably, in the fourth step, the carbon dioxide separation in the one tower and the regeneration of the absorbent and the carbon dioxide absorption in the other tower are simultaneously performed.

Preferably, the phase transferable absorbent solution comprises amidine, an organic alcohol and an organic solvent.

Preferably, the amidine is selected from the group consisting of 1,8-diazabicyclooldec-7-ene (DBU), 1,5-diazabicyclo (4.3.0) .

Preferably, the organic alcohol is a polyol, which is ethylene glycol or glycerol.

Preferably, the organic solvent is selected from the group consisting of tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidine And phenyl ether (DPE).

Preferably, the organic solvent is NMP, the amidine is DBU, and the organic alcohol is glycerol.

Preferably, the organic solvent is diphenyl ether, the amidine is DBU, and the organic alcohol is ethylene glycol.

Preferably, the concentration of the amidine and the organic alcohol in the organic solvent is 30% to 50%.

Preferably, the equivalent ratio of the organic alcohol to the amidine is 1.5 eq to 2 eq.

INDUSTRIAL APPLICABILITY According to the present invention, by using an organic solvent and an organic alcohol having high boiling point and low volatility, it is possible to reduce the loss of the absorbent solution and to perform quantitative phase separation in which phase separation occurs little by little depending on the amount of absorption, In addition to being able to apply the absorbent, it is also advantageous for phase separation to occur because of the high viscosity of the phase absorbing carbon dioxide from the phase transferable absorbent, and also for absorbing and desorbing more carbon dioxide at low and high temperatures, respectively, Effect.

In addition, there is an effect such that absorption and regeneration of carbon dioxide can be effectively performed even with a small amount of heat as compared with a conventional process of heating and regenerating the entire absorbent solution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a method for producing a carbon dioxide absorbent solution using amidine, organic alcohol and a solvent according to the present invention. FIG.
FIG. 2 illustrates two types of phase transition phenomena according to the present invention. FIG.
FIG. 3A is a graph showing carbon dioxide absorption capacity according to the concentration of DBU and glycerol in NMP according to the present invention. FIG.
FIG. 3B is a graph showing a carbon dioxide absorption curve [mg] absorbed per g active phase (DBU, EG) as a carbon dioxide absorption curve according to the concentration of DBU and glycerol in NMP according to the present invention.
FIG. 4A is a graph showing carbon dioxide absorption capacity according to the equivalence ratio of DBU and glycerol according to the present invention. FIG.
FIG. 4B is a graph showing the carbon dioxide absorption curve [mg] absorbed per g active phase (DBU, EG glycerol) as a carbon dioxide absorption curve according to the equivalence ratio of DBU and glycerol according to the present invention.
5 is a view showing a quantitative phase transition phenomenon depending on a CO2 absorption amount of a phase-transition sorbent solution according to the present invention.
FIG. 6 is a graph showing absorption curves according to the present invention according to the presence or absence of a non-polar solvent and a difference in absorption amounts at respective temperatures. FIG.
7 is a schematic diagram of a single batch system process for moving a solvent phase using a phase transition phenomenon in the method of absorbing and separating carbon dioxide according to the present invention.
8 is a schematic diagram of a double batch system process in which the solvent phase is transferred using the phase transition phenomenon in the method of absorbing and separating carbon dioxide according to the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

The carbon dioxide absorbent solution according to the present invention is characterized by comprising amidine, an organic alcohol and an organic solvent. That is, the carbon dioxide absorbent solution according to the present invention uses organic alcohols having a low specific heat and high boiling point instead of water, and also solves the problem of corrosion and loss of absorbent, and is capable of regenerating the absorbent at a lower temperature than MEA (monoethanolamine) The present invention is characterized in that a carbon dioxide absorbent solution (phase-transition absorbent solution) is prepared using a substance as an absorbent.

The method of absorbing and separating carbon dioxide according to the present invention is characterized by using a phase transferable absorbent solution. Preferably, the carbon dioxide can be absorbed and separated by moving the solvent phase in the phase-transferable absorbent solution that has absorbed carbon dioxide. That is, the amidine substance reacts with carbon dioxide in the presence of water or organic alcohols to form a polar bicarbonate salt. Therefore, by adding a nonpolar solvent to the absorbent solution, the polarity of [adimine + organic alcohol + carbon dioxide] It is possible to separate and regenerate only the phase absorbing carbon dioxide during the regeneration of the absorbent by inducing the phase transition to the [solvent] existing as a solvent, so that the carbon dioxide Is absorbed and regenerated.

From FIG. 1 showing a method of producing a phase transferable absorbent solution using amidine, organic alcohol and a solvent according to the present invention, in the carbon dioxide absorbent solution according to the present invention, amidine is 1,8-diazabicyclooldec- Diazabicycloc-7-ene (DBU), 1,5-diazabicyclo (4.3.0) 1,5-diazabicyclo (4.3.0) non-5- ene, DBN) or formamidine is preferably used. More preferably the formamidine is selected from the group consisting of N'-benzyl-N, N-dimethylformamidine, (1E, 1'E) -N'N'N''- (1,4-phenylenebis N ', N' '- (2,2', 2'-nitrilotris (ethane-2,1-diyl)) - tris (N, N-dimethylformimidamide), (1E, 1'E) -N ', N "- (ethane-1,2- N ', N "- (butane-1,4-diyl) bis (N, N-dimethylformimidamide). The organic alcohol is preferably a polyol having a plurality of hydroxyl groups in one molecule, and examples thereof include ethylene glycol or glycerol. Examples of the organic solvent include tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidine (NMP), toluene, xylene, (DPE) or the like is preferably used.

FIG. 2 shows two phase transition phenomena according to the present invention, wherein (a) shows a phenomenon of phase transition from liquid to liquid and solid, and (b) shows a phenomenon of phase transition from liquid to liquid to another liquid. Fig. Where "Gly" represents glycerol and "EG" represents ethylene glycol.

As can be seen from FIG. 2, when THF, DMF, DMAc or NMP is used as a solvent, the homogeneous liquid phase is initially injected with carbon dioxide, so that the powdery solid phase that absorbs carbon dioxide, Phase transition to the liquid phase occurs (a). On the other hand, in the case of toluene, xylene or diphenyl ether (DPE), the homogeneous liquid phase is initially injected with carbon dioxide and phase transition occurs to the liquid phase absorbing carbon dioxide and the liquid phase, which is mostly solvent. The phase transition phenomenon has already been reported in a paper (Nature, 2005, 436, 1102, Reversible nonpolar-to-polar solvent, Philip G Jessop; David J Heldebrant; Xiaowang Li; Charles A Eckert; Charles L Liotta) Since the organic alcohol and the solvent used in the carbon dioxide absorbing agent are low in boiling point because they are used only as a switchable solvent, the loss of the solution is high and the conditions and efficiency are not optimized. Therefore, in the present invention, Experiments were conducted to maximize the efficiency by reducing the loss of the absorbent solution and establishing optimum conditions for carbon dioxide absorption and regeneration using organic alcohols and solvents with low boiling points and low volatility.

In the carbon dioxide absorbent solution according to the present invention, the organic solvent may be NMP, the amidine may be DBU, and the organic alcohol may be glycerol. The organic solvent may be diphenyl ether, the amidine may be DBU, and the organic alcohol may be ethylene glycol.

In the carbon dioxide absorbent solution according to the present invention, the concentration of the amidine and the organic alcohol in the organic solvent is preferably 30% to 50%. In the carbon dioxide absorbent solution according to the present invention, when the concentration of the absorbent and the organic alcohol in the solvent is less than 30%, the viscosity, the absorption capacity and the absorption rate are not significantly different. On the other hand, , There is a problem of diffusion of carbon dioxide because of high viscosity, so that it shows low absorption capacity and absorption rate.

The carbon dioxide absorbent solution according to the present invention is characterized in that the equivalent ratio of the organic alcohol to the amidine is 1.5 eq to 2 eq. If the equivalent ratio is less than 1.5 eq, the ratio of the hydroxyl group of the alcohol per one amidine molecule is lowered, so that the absorption capacity and the absorption rate are lowered. If the equivalent ratio is more than 2 eq, there is a disadvantage in that desorption is not performed well.

As described above, the carbon dioxide absorbent solution according to the present invention is characterized by being capable of quantitative phase transition as carbon dioxide is injected.

Also, FIG. 7 is a schematic view of a single batch system process in which a solvent phase is transferred using a phase transition phenomenon during carbon dioxide absorption / regeneration according to the present invention, and FIG. 8 is a schematic view showing a phase transition phenomenon during carbon dioxide absorption / (Double batch system) process in which a solvent phase is transferred using a solvent.

7 and 8 are newly invented process concepts in the present invention. In the case of the phase transition sorbent used in this study, since the viscosity of the phase absorbing carbon dioxide is high, there is a problem in moving the absorbent absorbing carbon dioxide from the absorption tower to the deinking tower. In other words, the carbon dioxide-rich phase after absorption of carbon dioxide has a considerable viscosity, which makes it difficult to move to the regenerating tower. Therefore, a new invention of moving the carbon dioxide-lean phase, Accordingly, the present invention provides a method for absorbing and separating carbon dioxide which can solve such a problem by moving a [solvent] phase, which is not a method of moving a phase absorbing carbon dioxide, but mostly a solvent.

In the case of FIG. 7, when the phase transition occurs after the carbon dioxide is absorbed by the single batch system, the remaining solvent phase is moved to another place and the remaining [adimine + organic alcohol + carbon dioxide] phase is heated to separate pure carbon dioxide. After the regeneration of the sorbent is completed, the solvent moved to another site is moved to the absorber again, and then the carbon dioxide is absorbed again.

That is, the method of absorbing and separating carbon dioxide according to the present invention comprises a first step in which carbon dioxide is absorbed into the phase-transition absorbent solution in a single batch system, and then a phase transition occurs; and a step in which the solvent phase of the phase- A third step of separating carbon dioxide by heating the phase consisting of adimine, organic alcohol and carbon dioxide remaining after moving the solvent phase; and a third step of separating carbon dioxide after the carbon dioxide separation, And a fourth step of preparing the phase transferable absorbent solution by mixing the solvent phase transferred to another place of the second step with the phase consisting of the organic alcohol and mixing them.

In the case of the double batch system of FIG. 8, there is [adimine + organic alcohol + solvent] on one side and [adimine + organic alcohol] on the other side. First, the carbon dioxide is absorbed from the side of [adimine + organic alcohol + solvent]. After the absorption and phase transition are completed, the [solvent] phase is moved to the opposite side. In this case, [adimine + organic alcohol + carbon dioxide] is left on one side, and the mobile solvent is added on the other side to add [adimine + organic alcohol + solvent] Separation of carbon dioxide through heating and regeneration of the absorbent are promoted, and at the same time, absorption of carbon dioxide can be further promoted in the presence of [adimine + organic alcohol + solvent].

That is, the method of absorbing and separating carbon dioxide according to the present invention comprises a first step of placing a phase transferable absorbent solution in one tower in a double batch system, and placing an image of only adimine and organic alcohol in another tower, A second step of absorbing carbon dioxide in the absorbent solution and then causing a phase transition; and a third step of transferring the solvent phase of the phase-transferable absorbent solution, which has undergone the phase transition of the one tower, to the other column to produce a phase- And a fourth step in which the phase consisting of adimine, organic alcohol and carbon dioxide of the one tower is heated to separate carbon dioxide, regenerate the absorbent, and absorb the carbon dioxide in the phase-transferable absorbent solution of the other column, . Through this repetitive process, absorption and regeneration can be carried out simultaneously in two towers.

The "phase transfer type absorbent solution" used in the above carbon dioxide absorption and separation method is the same as the above "carbon dioxide absorbent solution"

Hereinafter, the constitution of the present invention and the effect thereof will be described in more detail through examples. However, the present invention is intended to further illustrate the present invention, and the scope of the present invention is not limited to these embodiments.

[Example]

As the carbon dioxide absorbing agent used in the carbon dioxide absorbent solution according to the present invention, commercially available 1,8-Diazabicycloundec-7-ene (DBU) and 1,5-Diazabicyclo (4.3.0) non-5-ene ) And formamidine having at least one amidine functional group synthesized by using the amine material of the present invention were mixed with an organic alcohol and solvent having a low boiling point and a low volatility at a constant ratio to prepare a carbon dioxide absorbent solution The optimum condition was established by carbon dioxide absorption / regeneration experiment under various conditions and phase transitions in each absorbent and solvent were observed.

The chemical structures and basic characteristics of the formamidines synthesized in Examples 1 to 5 of the present invention are shown in Table 1 below. These formamidines are as follows in the order of Table 1, respectively.

N-benzyl-N, N-dimethylformamide,

(1E, 1'E) -N ', N "- (1,4-phenylenebis (methylene)) bis (N, N- dimethylformimidamide)

(2E, 2'-nitrilotris (ethane-2,1-diyl) tris (N, N'- N-dimethylformimidamide)

(1E, 1'E) -N ', N "- (ethane-1,2-diyl) bis (N, N- dimethylformimidamide)

(1E, 1'E) -N ', N "- (butane-1,4-diyl) bis (N, N-dimethylformimidamide).

rescue Molecular Weight
[g / mol] Prize Theoretical absorption
[mg _CO2 / g _absorbent ] Number of amidine per molecule Example 1

162.2 Liquid 271 One Example 2

246.4 solid 357 2 Example 3

311.5 Liquid 424 3 Example 4

170.3 solid 517 2 Example 5

198.3 Liquid 444 2

The properties of the carbon dioxide absorbent solution according to the above examples were measured through the following experimental examples, and the results are shown in the figure.

[Experimental Example]

1. Analysis of carbon dioxide absorption curves according to DBU and glycerol concentrations in NMP

Figure 3a is a graph and Fig. 3b showing a carbon dioxide absorption capacity in accordance with the concentration of the NMP in DBU and glycerol according to the present invention, an NMP solution as in DBU and carbon dioxide absorption curve according to the concentration of glycerol in active phase (DBU, EG according to the invention glycerol) g of carbon dioxide adsorbed per gram of the catalyst. Here, the injection amount of carbon dioxide is 200 ml / min at 30 ° C, and the equivalent ratio of DBU to glycerol is 1: 1.5 eq.

As can be seen from FIG. 3, in the carbon dioxide absorbent solution according to the present invention, the absorber and the organic alcohol concentration in the solvent showed the highest absorption capacity and absorption rate at 30%, and the phase transition phenomenon was also rapidly exhibited. On the other hand, when the concentration is 60%, the viscosity is so high that the absorption of carbon dioxide is problematic. Therefore, the concentration of the absorbent and the organic alcohol in the solvent of the carbon dioxide absorbent solution according to the present invention is 30% to 50%, which is superior in absorbability and absorption rate.

2. Carbon dioxide absorption curve analysis by DBU and glycerol equivalence ratio

FIG. 4A is a graph showing carbon dioxide absorption capacity according to the equivalence ratio of DBU and glycerol according to the present invention. FIG. 4B is a graph showing carbon dioxide absorption curves according to the equivalence ratio between DBU and glycerol according to the present invention. And the mass of carbon dioxide [mg] absorbed per unit time.

As can be seen from FIG. 4, the absorption capacity of carbon dioxide according to the equivalence ratio of DBU and glycerol as the organic alcohol showed the highest absorption capacity at 1: 2 equivalence ratio and the highest absorption rate at 1: 1.5 equivalent ratio. The higher the ratio of the organic alcohol, the higher the probability that the amidine, organic alcohol, and carbon dioxide will meet and react, so that the absorption ability is high. Accordingly, the carbon dioxide absorbent solution according to the present invention has an equivalent ratio of the absorbent to the organic alcohol in the range of 1: 1.5 eq to 1: 2 eq (1.5 eq to 2 eq in terms of the equivalent ratio of the organic alcohol and the absorbent) .

3. Analysis of quantitative phase transition phenomenon depending on carbon dioxide uptake of phase-transition sorbent solution

FIG. 5 is a graph showing a quantitative phase transition phenomenon according to carbon dioxide absorption amount of the phase-transition sorbent solution according to the present invention. FIG. Particularly noteworthy in the present invention is that quantitative phase transition is possible as carbon dioxide is injected. When a certain amount of carbon dioxide is injected, the phase transition occurs in proportion to the amount of carbon dioxide injected and absorbed, not the phase transition occurring at a time. In other words, when a small amount of carbon dioxide is absorbed, a phase transition phenomenon occurs by a small amount, and when a large amount of carbon dioxide is absorbed, a phase transition phenomenon occurs by a large amount. This means that it is possible to apply a phase transferable absorbent even with a small amount of carbon dioxide absorption, which can be expected to further diversify the application of the phase transferable absorbent.

4. Analysis of the absorption curve for each temperature with and without a non-polar solvent

FIG. 6 is a graph showing the absorption curves according to the presence or absence of the non-polar solvent according to the present invention and the difference in the amount of absorption at each temperature. (B) is a graph of carbon dioxide uptake by temperature using amidine, organic alcohol, and nonpolar solvent, and (c) is a graph showing the amount of carbon dioxide absorbed by amidines and organic alcohols And the amount of carbon dioxide absorbed at each temperature is shown in FIG. As shown in FIG. 6, which shows the effect of the nonpolar solvent on the absorption / regeneration of carbon dioxide, the presence of a non-polar solvent shows a large difference in the capacity of carbon dioxide with temperature rather than the absence of solvent. That is, it can absorb more amount of carbon dioxide at lower temperature, and desorb more amount of carbon dioxide at higher temperature. It is believed that the polar bicarbonate salt formed after the absorption is unstable due to the nonpolar solvent, so that the bond with carbon dioxide can be broken more easily, thereby helping desorption of carbon dioxide. In many papers, N ₂ gas is used to desorb CO _2. The use of N ₂ gas is quite inefficient because it requires an additional process to separate N ₂ when carbon dioxide is used in other fields after CO ₂ recovery. , A large difference in the carbon dioxide capacity due to nonpolar solvents is a very positive result.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (26)

Amidines, organic alcohols, and organic solvents. The method according to claim 1,
The amidine is characterized by being 1,8-diazabicyclooldec-7-ene (DBU), 1,5-diazabicyclo (4.3.0) non-5-ene (DBN) or formamidine Carbon dioxide absorbent solution. 3. The method of claim 2,
The formamidine may be N, N-dimethylformamide, N'-benzyl-N ', N'-1,4-phenylenebis (methylene) (2E, 2'-nitrilotris (ethane-2,1-diyl) tris (N, N'- (1E, 1'E) -N ', N''- (ethane-1,2-diyl) bis (N, N- dimethylformimidamide) wherein the carbon dioxide absorbent solution is any one selected from the group consisting of '' - (butane-1,4-diyl) bis (N, N-dimethylformimidamide) The method according to claim 1,
Wherein the organic alcohol is a polyol. 5. The method of claim 4,
Wherein the polyol is ethylene glycol or glycerol. The method according to claim 1,
The organic solvent may be selected from the group consisting of tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidine (NMP), toluene, xylene and diphenyl ether ). ≪ / RTI > The method according to claim 1,
Wherein the organic solvent is NMP, the amidine is DBU, and the organic alcohol is glycerol. The method according to claim 1,
Wherein the organic solvent is diphenyl ether, the amidine is DBU, and the organic alcohol is ethylene glycol. 9. The method according to any one of claims 1 to 8,
Wherein the concentration of the amidine and the organic alcohol in the organic solvent is 30% to 50%. 9. The method according to any one of claims 1 to 8,
Wherein the equivalent ratio of the organic alcohol to the amidine is 1.5 eq to 2 eq. 9. The method according to any one of claims 1 to 8,
Wherein the carbon dioxide absorbent solution is capable of a quantitative phase transition as carbon dioxide is injected into the carbon dioxide absorbent solution. A method of absorbing and separating carbon dioxide, comprising using a phase transferable absorbent solution. 13. The method of claim 12,
Wherein the solvent phase is moved in the phase-transition absorbent solution absorbing the carbon dioxide. 13. The method of claim 12,
The method includes a first step in which phase transition occurs after absorbing carbon dioxide into the phase transferable absorbent solution,
A second step of moving the solvent phase of the phase-transition absorbent solution after the phase transition is completed to another place;
A third step of separating the carbon dioxide by heating the phase of the remaining adimine, organic alcohol and carbon dioxide after moving the solvent phase,
And a fourth step of preparing the phase transferable absorbent solution by moving the solvent phase transferred to another place in the second step with the phase composed of amidine and organic alcohol having been completely regenerated after the carbon dioxide separation, ≪ / RTI > 13. The method of claim 12,
The method includes a first step of placing a carbon dioxide absorbent solution in one column and placing an image of only adimine and organic alcohol in another column,
A second step in which carbon dioxide is absorbed in the carbon dioxide absorbent solution and a phase transition occurs;
A third step of moving the solvent phase of the phase-transferable absorbent solution having completed the phase transformation of one column to the other column to produce a carbon dioxide absorbent solution;
And a fourth step of heating the phase composed of the adimine, organic alcohol and carbon dioxide of the one column to separate carbon dioxide, regenerating the absorbent, and absorbing carbon dioxide in the carbon dioxide absorbent solution of the other column, followed by phase transformation Characterized in that the carbon dioxide absorbing and separating method is carried out. 16. The method of claim 15,
Wherein the step of separating carbon dioxide in the one tower and the regeneration of the absorbent and the absorption of carbon dioxide in the other column are simultaneously performed in the fourth step. 17. The method according to any one of claims 12 to 16,
Wherein the carbon dioxide sorbent solution comprises amidine, an organic alcohol and an organic solvent. 17. The method according to any one of claims 12 to 16,
The amidine is characterized by being 1,8-diazabicyclooldec-7-ene (DBU), 1,5-diazabicyclo (4.3.0) non-5-ene (DBN) or formamidine Carbon dioxide absorption and separation method. 17. The method according to any one of claims 12 to 16, wherein the formamidine is selected from the group consisting of N'-benzyl-N, N-dimethylformamidine, (1E, N ', N' '- (2,2', 2 '' - nitrilotris (methylene)) bis (N, N-dimethylformimidamide) (ethane-2,1-diyl)) tris (N, N-dimethylformimidamide), (1E, 1'E) -N ', N " ), (1E, 1'E) -N ', N' '- butane-1,4-diyl bis (N, N-dimethylformimidamide) Separation method. 17. The method according to any one of claims 12 to 16,
Wherein the organic alcohol is a polyol. 17. The method according to any one of claims 12 to 16,
Wherein the polyol is ethylene glycol or glycerol. 17. The method according to any one of claims 12 to 16,
The organic solvent may be selected from the group consisting of tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidine (NMP), toluene, xylene and diphenyl ether ). ≪ / RTI > A method of absorbing and separating carbon dioxide, comprising: 17. The method according to any one of claims 12 to 16,
Wherein the organic solvent is NMP, the amidine is DBU, and the organic alcohol is glycerol. 17. The method according to any one of claims 12 to 16,
Wherein the organic solvent is diphenyl ether, the amidine is DBU, and the organic alcohol is ethylene glycol. 18. The method of claim 17,
Wherein the concentration of the amidine and the organic alcohol in the organic solvent is 30% to 50%. 18. The method of claim 17,
Wherein the equivalent ratio of the organic alcohol to amidine is 1.5 eq to 2 eq.

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