A highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent and its preparation method

Abstract

The present invention provides a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent and a preparation method thereof, which relates to the field of gas adsorption. The method includes the following steps: S1, after uniformly mixing metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles, dispersing them in deionized water, adding a coupling agent, and stirring evenly; S2, adding chitosan to a dilute acetic acid solution, ultrasonically dispersing it evenly, then adding metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles and an emulsifier, ultrasonically emulsifying, adjusting the pH value to 7, and spray granulating to obtain coated particles; S3, adding an organic alkanolamine solution to the solution system in step S1, heating and stirring evenly; then adding the coated particles, an antioxidant, a corrosion inhibitor and an imidazole-based ionic liquid, and ultrasonically dispersing them evenly. By coating MOF-808 nanoparticles and UiO-66 nanoparticles with chitosan and combining them with imidazole ionic liquid, the service life of the capture solvent can be effectively extended and the stability of the capture solvent can be improved.

Description

Technical Field

[0001] The present invention relates to the field of gas adsorption, and more particularly, to a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent and a preparation method thereof. Background Art

[0002] Capture technology refers to a series of technologies and methods aimed at reducing the concentration of CO2 in the atmosphere, which is a key link in carbon capture, utilization and storage (CCUS) technology. Common carbon dioxide capture methods include absorption method, membrane separation method, physical adsorption method, etc. Among them, adsorption method includes physical adsorption and chemical adsorption. Physical adsorption uses the adsorption function of porous structure to capture carbon dioxide gas, while chemical adsorption uses the active sites on the surface of the adsorption material to combine with carbon dioxide to fix carbon dioxide on the adsorbent. Physical adsorption has poor selectivity for gases, but the reuse rate of physical adsorbents is high; although chemical adsorption has high selectivity for gases, the reuse cost of adsorption materials is high.

[0003] Ionic liquid adsorbents are adsorbents composed of organic cations combined with organic anions and inorganic anions, and have characteristics such as high thermal stability and high chemical stability, and can be used to adsorb acidic gases. Ionic liquid adsorbents mainly include amino acid ionic liquids, imidazole ionic liquids, amino-based ionic liquids, etc. Patent 202311206378.2 discloses a method for capturing carbon dioxide with an ionic liquid composite absorbent. The absorbent is composed of an ionic liquid and a hydrogen bond donor, and has the advantages of low viscosity and good stability, and can avoid the volatilization and loss of organic amines. Patent 202011359524.1 discloses the application of carboxylate compounds as absorbents for capturing carbon dioxide. In this carboxylate ionic liquid, the carboxylic acid anion is a carboxylate group with a carbon chain having more than 3 carbon atoms, and the cation is a substituted quaternary ammonium ion and / or quaternary phosphonium ion. It has the advantages of cheap and easily available absorbent raw materials, simple synthesis, high capture amount, water-stable capture amount, low temperature required for desorption, fast speed, and low energy consumption. Patent 201310080111.3 discloses a composite absorbent for capturing carbon dioxide with an alcoholamine-based ionic liquid, including an absorption component composed of N-methyldiethanolamine and the ionic liquid [TETAH]+[BF4]-, a corrosion inhibitor, an antioxidant and a solvent. By mixing organic amines with ionic liquids, the characteristics of high absorption rate and large absorption capacity of organic alkanolamines and the properties of low vapor pressure and good stability of ionic liquids are combined to complement each other to improve the carbon dioxide treatment ability.

[0004] However, the existing ionic liquid adsorbents are mainly chemical adsorption, and their adsorption efficiency still needs to be improved. Moreover, the stability of ionic liquids is poor, and they are prone to degradation during use, resulting in short service life and poor adsorption effect. Summary of the Invention

[0005] The object of the present invention is to provide a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent, which has a high carbon dioxide adsorption capacity, a long service life, good stability and is not easily degraded.

[0006] Another object of the present invention is to provide a preparation method of a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent. By coating MOF-808 nanoparticles and UiO-66 nanoparticles with chitosan and incorporating them into an imidazole ionic liquid, the service life of the capture solvent can be effectively extended and the stability of the capture solvent can be improved.

[0007] The present invention solves its technical problems by adopting the following technical solutions.

[0008] On the one hand, an embodiment of the present invention provides a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent, including the following steps:

[0009] S1, after uniformly mixing MOF-808 nanoparticles of an organic framework metal material and UiO-66 nanoparticles, dispersing them in deionized water, adding a coupling agent, and stirring evenly;

[0010] S2, adding chitosan to a dilute acetic acid solution, ultrasonically dispersing it evenly, then adding MOF-808 nanoparticles of an organic framework metal material, UiO-66 nanoparticles and an emulsifier, ultrasonically emulsifying, adjusting the pH value to 7, and spray granulating to obtain coated particles;

[0011] S3, adding an organic alkanolamine solution to the solution system of step S1, heating and stirring evenly; then adding the coated particles, an antioxidant, a corrosion inhibitor and an imidazole-based ionic liquid, and ultrasonically dispersing evenly to obtain the product.

[0012] In some embodiments of the present invention, the weight average molecular weight of the chitosan is 8-10 KDa.

[0013] In some embodiments of the present invention, the emulsifier is one of sorbitan monooleate, sorbitan oleate, and sodium stearoyl lactate.

[0014] In some embodiments of the present invention, the organic alkanolamine solution is one or a mixture of diethanolamine, 2-methylaminoethanol, 2-ethylaminoethanol, etc.

[0015] In some embodiments of the present invention, the antioxidant is a mixture of ascorbic acid, sodium sulfite and copper acetate, and the mass ratio of the three is (0.5-1):1:(0.5-1).

[0016] In some embodiments of the present invention, the corrosion inhibitor is vanadium pentoxide.

[0017] In some embodiments of the present invention, the imidazole-based ionic liquid is one of 1,2,3,4,5-pentamethylimidazole tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazole tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazole tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazole tetracyanoborate.

[0018] In some embodiments of the present invention, in step S2, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:(0.3 - 0.5):(0.3 - 0.5).

[0019] In some embodiments of the present invention, in step S3, the ratio of the mass of the added coating particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is (0.5 - 1):1.

[0020] In some embodiments of the present invention, the coupling agent is one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-glycidyletheroxypropyltrimethoxysilane.

[0021] On the other hand, an embodiment of the present invention provides a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent prepared by the above method.

[0022] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0023] For the ionic liquid carbon capture solvent provided by the present invention, MOF-808 nanoparticles and UiO-66 nanoparticles are used as carriers and combined with an imidazole-based ionic liquid as a carbon dioxide capture solvent, which can improve the adsorption capacity and stability of the capture solvent. Secondly, in the capture solvent provided by the present invention, the wrapping property of chitosan is also utilized to wrap MOF-808 nanoparticles and UiO-66 nanoparticles into a core-shell structure, that is, there are both wrapped MOF-808 nanoparticles and UiO-66 nanoparticles, unwrapped MOF-808 nanoparticles and UiO-66 nanoparticles, and an imidazole ionic liquid in the capture solvent, and the three act together to improve the adsorption capacity of the capture solvent for carbon dioxide; Thirdly, when using this capture solvent, as the amount of adsorbed carbon dioxide increases, the capture solvent gradually becomes acidic, and the chitosan wall material on the surface of the coating particles swells and ruptures, releasing the MOF-808 nanoparticles and UiO-66 nanoparticles core materials. These MOF-808 nanoparticles and UiO-66 nanoparticles can further adsorb carbon dioxide, effectively extending the service life of the capture solvent.

[0024] In the capture solvent of the present invention, an antioxidant and a corrosion inhibitor are also added, which can improve the antioxidant performance of the capture solvent and reduce the corrosion of the capture solvent to metal equipment. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. For those not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are followed. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0027] The embodiments of the present invention provide a highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent, including the following steps:

[0028] S1. After uniformly mixing metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles, disperse them in deionized water, add a coupling agent, and stir evenly;

[0029] S2. Add chitosan with a weight average molecular weight of 8-10 KDa to a dilute acetic acid solution, ultrasonically disperse it evenly, then add metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles, and an emulsifier, ultrasonically emulsify, adjust the pH value to 7, and spray granulate to obtain coated particles; the emulsifier is one of sorbitan monooleate, sorbitan monooleate, and sodium stearoyl lactate.

[0030] S3. Add an organic alkanolamine solution to the solution system in step S1, heat and stir evenly; then add the coated particles, an antioxidant, a corrosion inhibitor, and an imidazole-based ionic liquid, and ultrasonically disperse evenly.

[0031] Among them, in the embodiments of the present invention, the organic alkanolamine solution is a mixture of one or more of diethanolamine, 2-methylaminoethanol, and 2-ethylaminoethanol. The antioxidant is a mixture of ascorbic acid, sodium sulfite, and copper acetate, and the mass ratio of the three is (0.5 - 1):1:(0.5 - 1). The corrosion inhibitor is vanadium pentoxide, and the imidazole-based ionic liquid is one of 1,2,3,4,5-pentamethylimidazole tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazole tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazole tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazole tetracyanoborate. The mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:(0.3 - 0.5):(0.3 - 0.5). In step S3, the ratio of the mass of the added coated particles to the total mass of the MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is (0.5 - 1):1.

[0032] The features and properties of the present invention will be further described in detail below in conjunction with the embodiments.

[0033] Example 1

[0034] Prepare the ionic liquid carbon capture solvent of this example according to the following steps:

[0035] S1, mix MOF-808 nanoparticles and UiO-66 nanoparticles evenly according to a mass ratio of 1:1, disperse them in deionized water, and add γ-aminopropyltriethoxysilane in an amount of 20% of the mass of the metal-organic framework material, and stir evenly; among them, the average particle size of MOF-808 nanoparticles is 200 nm, and the average particle size of UiO-66 nanoparticles is 200 nm;

[0036] S2, add chitosan with a weight average molecular weight of 9 KDa to a dilute acetic acid solution (mass fraction of 5%), disperse it evenly by ultrasonic wave, then add metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles, and sorbitan monooleate, and perform ultrasonic emulsification for 10 min with an ultrasonic emulsification rod, and then adjust the pH value to 7, and spray granulate to obtain coated particles; among them, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.5:0.5.

[0037] S3, add diethanolamine to the solution system in step S1, heat and stir evenly; then add coated particles, antioxidant, vanadium pentoxide, and 1,2,3,4,5-pentamethylimidazole tetracyanoborate, and disperse them evenly by ultrasonic wave to obtain the ionic liquid carbon capture solvent of this example.

[0038] Among them, the antioxidant is a mixture of ascorbic acid, sodium sulfite and copper acetate, and the mass ratio of the three is 0.5:1:0.5. The mass ratio of the added coating particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in step S1 is 1:1. The mass ratio of the coating particles to 1,2,3,4,5-pentamethylimidazole tetracyanoborate is 0.5:1. The mass fractions of the antioxidant and vanadium pentoxide in the ionic liquid carbon capture solvent are both 5%.

[0039] Example 2

[0040] Prepare the ionic liquid carbon capture solvent of this example according to the following steps:

[0041] S1, mix MOF-808 nanoparticles and UiO-66 nanoparticles, which are organic framework metal materials, evenly according to a mass ratio of 1:1, disperse them in deionized water, add a coupling agent, and stir evenly; among them, the average particle size of MOF-808 nanoparticles is 200nm, and the average particle size of UiO-66 nanoparticles is 200nm;

[0042] S2, add chitosan with a weight average molecular weight of 10KDa to a dilute acetic acid solution (mass fraction of 5%), disperse it evenly by ultrasonic wave, then add MOF-808 nanoparticles, UiO-66 nanoparticles of organic framework metal materials, and emulsifiers sorbitan monooleate, sorbitan oleate, sodium stearoyl lactate, and perform ultrasonic emulsification, adjust the pH value to 7, and spray granulate to obtain coating particles; among them, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.3:0.5.

[0043] S3, add 2-methylaminoethanol to the solution system in step S1, heat and stir evenly; then add coating particles, antioxidant, vanadium pentoxide and 1,3-ethyl-2,4,5-methylimidazole tetracyanoborate, and disperse them evenly by ultrasonic wave to obtain the ionic liquid carbon capture solvent of this example.

[0044] Among them, the antioxidant is a mixture of ascorbic acid, sodium sulfite and copper acetate, and the mass ratio of the three is 1:1:0.5. The mass ratio of the added coating particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 0.5:1. The mass ratio of the coating particles to 1,3-ethyl-2,4,5-methylimidazole tetracyanoborate is 0.5:1. The mass fractions of the antioxidant and vanadium pentoxide in the ionic liquid carbon capture solvent are both 5%.

[0045] Example 3

[0046] Prepare the ionic liquid carbon capture solvent of this example according to the following steps:

[0047] S1. At a mass ratio of 1:1, mix the metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles evenly, disperse them in deionized water, add a coupling agent, and stir evenly. Among them, the average particle size of the MOF-808 nanoparticles is 200 nm, and the average particle size of the UiO-66 nanoparticles is 200 nm.

[0048] S2. Add chitosan with a weight-average molecular weight of 10 KDa to a dilute acetic acid solution (mass fraction of 5%), disperse it evenly by ultrasonic treatment, then add the metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles, and emulsifiers sorbitan monooleate, sorbitan anhydride monooleate, and sodium stearoyl lactate, perform ultrasonic emulsification, adjust the pH value to 7, and spray granulate to obtain coated particles. Among them, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.3:0.3.

[0049] S3. Add 2-methylaminoethanol to the solution system in step S1, heat and stir evenly; then add the coated particles, antioxidant, vanadium pentoxide, and 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and disperse them evenly by ultrasonic treatment to obtain the ionic liquid carbon capture solvent of this example.

[0050] Among them, the antioxidant is a mixture of ascorbic acid, sodium sulfite, and copper acetate, and the mass ratio of the three is 0.5:1:1. The ratio of the mass of the added coated particles to the total mass of the MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 0.8:1. The mass ratio of the coated particles to 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate is 0.8:1. The mass fractions of the antioxidant and vanadium pentoxide in the ionic liquid carbon capture solvent are both 5%.

[0051] Example 4

[0052] Prepare the ionic liquid carbon capture solvent of this example according to the following steps:

[0053] S1. At a mass ratio of 1:1, mix the metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles evenly, disperse them in deionized water, add a coupling agent, and stir evenly. Among them, the average particle size of the MOF-808 nanoparticles is 200 nm, and the average particle size of the UiO-66 nanoparticles is 200 nm.

[0054] S2. Add chitosan with a weight-average molecular weight of 8 KDa to a dilute acetic acid solution (mass fraction of 5%), ultrasonically disperse it evenly, then add metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles, and emulsifiers sorbitan monooleate, sorbitan oleate, and sodium stearoyl lactate, ultrasonically emulsify, adjust the pH value to 7, and spray granulate to obtain coated particles; among them, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.3:0.3.

[0055] S3. Add 2-ethylaminoethanol to the solution system in step S1, heat and stir evenly; then add coated particles, antioxidant, vanadium pentoxide, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate, and ultrasonically disperse evenly to obtain the ionic liquid carbon capture solvent of this example.

[0056] Among them, the antioxidant is a mixture of ascorbic acid, sodium sulfite, and copper acetate, and the mass ratio of the three is 0.8:1:0.8. The ratio of the mass of the added coated particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 1:1. The mass ratio of the coated particles to 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate is 0.5:1. The mass fractions of the antioxidant and vanadium pentoxide in the ionic liquid carbon capture solvent are both 5%.

[0057] Example 5

[0058] Prepare the ionic liquid carbon capture solvent of this example according to the following steps:

[0059] S1. Mix metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles evenly according to a mass ratio of 1:1, disperse them in deionized water, add a coupling agent, and stir evenly; among them, the average particle size of MOF-808 nanoparticles is 200 nm, and the average particle size of UiO-66 nanoparticles is 200 nm;

[0060] S2. Add chitosan with a weight-average molecular weight of 8 KDa to a dilute acetic acid solution (mass fraction of 5%), ultrasonically disperse it evenly, then add metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles, and emulsifiers sorbitan monooleate, sorbitan oleate, and sodium stearoyl lactate, ultrasonically emulsify, adjust the pH value to 7, and spray granulate to obtain coated particles; among them, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.5:0.5.

[0061] S3. Add 2-methylaminoethanol to the solution system of step S1, heat and stir evenly; then add the coated particles, antioxidant, vanadium pentoxide, and 1-ethyl-3-propyl-2,4,5-trimethylimidazolium tetracyanoborate, and disperse evenly by ultrasonic treatment to obtain the ionic liquid carbon capture solvent of this example.

[0062] Among them, the antioxidant is a mixture of ascorbic acid, sodium sulfite, and copper acetate, and the mass ratio of the three is 0.5:1:1. The mass ratio of the added coated particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 0.5:1. The mass ratio of the coated particles to 1-ethyl-3-propyl-2,4,5-trimethylimidazolium tetracyanoborate is 0.5:1. The mass fractions of the antioxidant and vanadium pentoxide in the ionic liquid carbon capture solvent are both 5%.

[0063] Example 6

[0064] The difference from Example 1 is that in S2 of this example, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.3:0.5. The remaining raw material ratios and steps are the same as those of Example 1.

[0065] Example 7

[0066] The difference from Example 1 is that in S2 of this example, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:0.5:0.3. The remaining raw material ratios and steps are the same as those of Example 1.

[0067] Example 8

[0068] The difference from Example 1 is that in S3 of this example, the mass ratio of the added coated particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 0.5:1; the remaining raw material ratios and steps are the same as those of Example 1.

[0069] Example 9

[0070] The difference from Example 1 is that in S3 of this example, the mass ratio of the added coated particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is 0.8:1. The remaining raw material ratios and steps are the same as those of Example 1.

[0071] Example 10

[0072] The difference from Example 1 is that in step S3 of this example, the organic alkanolamine solution is a mixture of diethanolamine and 2-methylaminoethanol with a mass ratio of 1:1, and the remaining raw material ratios and steps are the same as those in Example 1.

[0073] Example 11

[0074] The difference from Example 1 is that in step S3 of this example, the organic alkanolamine solution is a mixture of diethanolamine and 2-methylaminoethanol with a mass ratio of 1:1, and the imidazole-based ionic liquid is a mixture of 1,2,3,4,5-pentamethylimidazole tetracyanoborate and 1-ethyl-2,4,5-methylimidazole tetracyanoborate with a mass ratio of 1:1. The remaining raw material ratios and steps are the same as those in Example 1.

[0075] Comparative Example 1

[0076] The difference from Example 1 is that in this comparative example, step S2 is not carried out, and the remaining raw material ratios and steps are the same as those in Example 1. The specific preparation method is as follows:

[0077] Mix MOF-808 nanoparticles and UiO-66 nanoparticles evenly according to a mass ratio of 1:1, disperse them in deionized water, and add γ-aminopropyltriethoxysilane in an amount of 20% of the mass of the metal-organic framework material, and stir evenly; among them, the average particle size of MOF-808 nanoparticles is 200 nm, and the average particle size of UiO-66 nanoparticles is 200 nm;

[0078] Add diethanolamine to the above solution system, heat and stir evenly; then add an antioxidant, vanadium pentoxide and 1,2,3,4,5-pentamethylimidazole tetracyanoborate, and disperse them evenly by ultrasonic wave to obtain an ionic liquid carbon capture solvent.

[0079] Comparative Example 2

[0080] The difference from Example 1 is that in this comparative example, the organic alkanolamine solution is not added, and the remaining raw materials and steps are the same as those in Example 1.

[0081] Experimental Example

[0082] 1. Using the carbon dioxide capture solvents of Examples 1-5 and Comparative Examples 1-2 as test objects, test the carbon dioxide adsorption performance of each carbon dioxide capture solvent according to the following method.

[0083] Add each carbon dioxide capture solvent into a 10-ml glass container with an inner diameter of 2 cm, with an addition amount of 5 ml. Heat the glass container in a water bath and control the temperature of the carbon dioxide capture solvent at 40 °C. Then, introduce carbon dioxide gas into the container at a rate of 20 ml / min, with a pressure of 0.1 MPa, and the carbon dioxide introduction time is 2 h. Weigh the glass container with an analytical balance before and after capture, and the mass difference before and after is the carbon dioxide capture amount. The results are shown in Table 1.

[0084] 2. Add each carbon dioxide capture solvent into a 10-ml glass container with an inner diameter of 2 cm, with an addition amount of 5 ml. Heat the glass container in a water bath and control the temperature of the carbon dioxide capture solvent at 90 °C. Then, introduce carbon dioxide gas into the container at a rate of 20 ml / min, with a pressure of 0.1 MPa, and the carbon dioxide introduction time is 2 h. Weigh the glass container with an analytical balance before and after capture, and the mass difference before and after is the carbon dioxide capture amount. The results are shown in Table 1.

[0085] 3. Add each carbon dioxide capture solvent into a 10-ml glass container with an inner diameter of 2 cm, heat it in a water bath to 90 °C, and keep it warm for 5 h. Then, according to the above method, test the carbon dioxide adsorption performance of each carbon dioxide capture solvent at 40 °C. The results are shown in Table 1.

[0086] Table 1

[0087]

[0088] It can be concluded from Table 1 above that the carbon dioxide capture solvents provided in the embodiments of the present invention have excellent adsorption performance at both low and high temperatures, and still have excellent adsorption performance after 5 h of high-temperature heat treatment. However, in Comparative Example 1, after high-temperature treatment, its adsorption performance decreases significantly. Thus, it can be shown that in this embodiment, through the coating effect of chitosan, the stability of the carbon dioxide capture solvent can be improved.

[0089] In summary, for the ionic liquid carbon capture solvent provided by the present invention, MOF-808 nanoparticles and UiO-66 nanoparticles are used as carriers and incorporated into imidazole-based ionic liquids as carbon dioxide capture solvents, which can improve the adsorption capacity and stability of the capture solvent. Secondly, in the capture solvent provided by the present invention, the encapsulation property of chitosan is also utilized to encapsulate MOF-808 nanoparticles and UiO-66 nanoparticles into a core-shell structure, that is, there are simultaneously encapsulated MOF-808 nanoparticles and UiO-66 nanoparticles, unencapsulated MOF-808 nanoparticles and UiO-66 nanoparticles, and imidazole ionic liquid in the capture solvent. The three act together to improve the adsorption capacity of the capture solvent for carbon dioxide. Thirdly, when using this capture solvent, as the amount of adsorbed carbon dioxide increases, the capture solvent gradually becomes acidic, and the chitosan wall material on the surface of the encapsulated particles swells and ruptures, releasing the core materials of MOF-808 nanoparticles and UiO-66 nanoparticles. This part of MOF-808 nanoparticles and UiO-66 nanoparticles can further adsorb carbon dioxide, effectively extending the service life of the capture solvent. In the capture solvent of the present invention, antioxidants and corrosion inhibitors are also added to improve the antioxidant performance of the capture solvent and reduce the corrosion of metal equipment by the capture solvent.

[0090] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. A preparation method of a functionalized ionic liquid carbon capture solvent with high anti-degradability and low corrosivity, characterized in that It includes the following steps: S1. After uniformly mixing metal-organic framework material MOF-808 nanoparticles and UiO-66 nanoparticles, disperse them in deionized water, add a coupling agent, and stir evenly; S2. Add chitosan to a dilute acetic acid solution, ultrasonically disperse it evenly, then add metal-organic framework material MOF-808 nanoparticles, UiO-66 nanoparticles and an emulsifier, ultrasonically emulsify, adjust the pH value to 7, and spray granulate to obtain coated particles; S3. Add an organic alkanolamine solution to the solution system in step S1, heat and stir evenly; then add the coated particles, an antioxidant, a corrosion inhibitor and an imidazole-based ionic liquid, and ultrasonically disperse evenly. That's all.

2. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, The weight-average molecular weight of the chitosan is 8 - 10 KDa.

3. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, The emulsifier is one of sorbitan monooleate, sorbitan oleate, and sodium stearoyl lactate.

4. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, The organic alkanolamine solution is one or a mixture of two or more of diethanolamine, 2-methylaminoethanol, and 2-ethylaminoethanol.

5. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that The antioxidant is a mixture of ascorbic acid, sodium sulfite, and copper acetate, and the mass ratio of the three is (0.5 - 1):1:(0.5 - 1).

6. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, The corrosion inhibitor is vanadium pentoxide.

7. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, The imidazole-based ionic liquid is one of 1,2,3,4,5-pentamethylimidazole tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazole tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazole tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazole tetracyanoborate.

8. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, In the step S2, the mass ratio of chitosan, MOF-808 nanoparticles, and UiO-66 nanoparticles is 1:(0.3 - 0.5):(0.3 - 0.5).

9. The preparation method of the highly anti-degradable and low-corrosive functionalized ionic liquid carbon capture solvent according to claim 1, characterized in that, In the step S3, the ratio of the mass of the added coated particles to the total mass of MOF-808 nanoparticles and UiO-66 nanoparticles in the solution system prepared in step S1 is (0.5 - 1):

1.

10. A functionalized ionic liquid carbon capture solvent with high anti-degradability and low corrosivity, characterized in that, It is prepared by the method according to any one of claims 1 - 8.

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