Super-alkaline eutectic solvent as well as preparation method and application thereof
By preparing an ultra-basic eutectic solvent and utilizing a specific combination of hydrogen bond acceptors and donors, the problem of insufficient CO2 solubility in eutectic solvents at high temperatures was solved, achieving efficient CO2 capture and reducing energy consumption.
Patent Information
- Application Number
- CN202511815823.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-01-02
AI Technical Summary
Existing eutectic solvents have limited CO2 solubility and insufficient stability at high temperatures. In traditional DES systems, the enhanced hydrogen bond network leads to increased viscosity, limiting mass transfer and affecting absorption efficiency.
A super-alkaline eutectic solvent is used, with 1,5-diazabicyclo[4.3.0]non-5-ene and/or 1,8-diazabicyclo[5.4.0]undec-7-ene as hydrogen bond acceptors and ethanolamine and/or 3-amino-1-propanol as hydrogen bond donors, in a molar ratio of 1:4~10. After mixing, a solvent with low viscosity is formed, which enhances mass transfer performance.
It improves the absorption efficiency of carbon dioxide, reduces viscosity, enhances the CO2 diffusion rate and mass transfer coefficient at the gas-liquid interface, achieves efficient CO2 capture, and reduces energy consumption.
Smart Images
Figure CN121243977A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of carbon dioxide capture technology, specifically relating to an ultra-alkaline eutectic solvent, its preparation method, and its application. Background Technology
[0002] With the continuous use of fossil fuels, the concentration of carbon dioxide (CO2) in the atmosphere has been increasing year by year. CO2 emission reduction and capture have become a key research focus in the fields of energy, chemical engineering, and environmental engineering. Currently, the main CO2 capture method is chemical absorption. Traditional chemical absorption uses amine solutions (such as monoethanolamine MEA) as absorbents, which have the advantages of high absorption efficiency and fast reaction rate. However, it suffers from problems such as high energy consumption, strong corrosiveness, easy solvent degradation, and poor cycle stability, limiting its long-term use in industry.
[0003] In recent years, deep eutectic solvents (DES) have become an important alternative to traditional amine liquid systems due to their advantages such as low volatility, high designability, and environmental friendliness. DES are typically formed by mixing hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) in a specific molar ratio, and their absorption performance is closely related to viscosity, density, hydrogen bond strength, and molecular polarity. However, existing research on DES mainly focuses on physically absorbent systems (such as choline salt-based HBAs), which have limited CO2 solubility (typically less than 0.1 g CO2·g). -1 DES), and its stability is insufficient under high temperature operation.
[0004] While chemisorption can be achieved by introducing amine or hydroxyl groups into DES to enhance its reactivity with CO2, balancing high absorption capacity with viscosity reduction and improved mass transfer remains a technical challenge. In traditional DES systems, viscosity often increases with the strengthening of the hydrogen bond network, leading to limited mass transfer and thus restricting absorption efficiency. Summary of the Invention
[0005] In view of this, the present invention provides a super-basic eutectic solvent, its preparation method and application. The super-basic eutectic solvent provided by the present invention has low viscosity and high absorption efficiency for carbon dioxide.
[0006] To address the aforementioned technical problems, this invention provides a super-basic eutectic solvent comprising a hydrogen bond acceptor and a hydrogen bond donor; The hydrogen bond acceptor includes 1,5-diazabicyclo[4.3.0]non-5-ene and / or 1,8-diazabicyclo[5.4.0]undec-7-ene; The hydrogen bond donors include ethanolamine and / or 3-amino-1-propanol; The molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is 1:4~10.
[0007] Preferably, the superalkaline eutectic solvent has a water content of less than 0.3 wt%, a decomposition temperature of 117.5~155.6℃, and a viscosity of 60~131 mPa·s.
[0008] Preferably, the superalkaline eutectic solvent comprises 1,5-diazabicyclo[4.3.0]non-5-ene and ethanolamine; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene to ethanolamine is 1:4, 1:6, 1:8 or 1:10.
[0009] Preferably, the superalkaline eutectic solvent comprises 1,5-diazabicyclo[4.3.0]non-5-ene and 3-amino-1-propanol; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene and 3-amino-1-propanol is 1:4, 1:6, 1:8 or 1:10.
[0010] Preferably, the superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and ethanolamine; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene and ethanolamine is 1:4, 1:6, 1:8 or 1:10.
[0011] Preferably, the superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and 3-amino-1-propanol; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene and 3-amino-1-propanol is 1:4, 1:6, 1:8 or 1:10.
[0012] This invention also provides a method for preparing the superalkali eutectic solvent described in the above technical solution, comprising the following steps: The superbasic eutectic solvent is obtained by mixing the hydrogen bond acceptor and the hydrogen bond donor.
[0013] Preferably, the mixing is carried out under magnetic stirring conditions, the mixing temperature is 20~35℃, and the mixing time is 4~5h; The mixing process also includes: allowing the mixed system to stand for 4-6 hours.
[0014] The present invention also provides the application of the superalkali eutectic solvent described in the above technical solution in the absorption of carbon dioxide.
[0015] Preferably, the temperature for absorbing carbon dioxide using the superalkali eutectic solvent is 295.15~301.15K, the pressure is 100~105kPa, and the absorption capacity is 4.1280~5.8841mol·kg⁻¹. -1 .
[0016] This invention provides a superbasic eutectic solvent comprising a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bond acceptor comprises 1,5-diazabicyclo[4.3.0]non-5-ene and / or 1,8-diazabicyclo[5.4.0]undec-7-ene; the hydrogen bond donor comprises ethanolamine and / or 3-amino-1-propanol; the molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is 1:4~10. In this invention, 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) are superbasic N-heterocyclic "superbase" acceptors, possessing high electron density in the acceptor region and low protonation energy; they have stronger acceptor capacity and ring system rigidity, which can stabilize the hydrogen bond network and promote the absorption of amine groups and CO2. In this invention, ethanolamine (MEA) and 3-amino-1-propanol (AP) contain reactive amine groups and hydroxyl groups with strong hydrogen-donating capabilities, wherein -NH2 is a chemisorption active site and -OH can strengthen the hydrogen bond network. This invention limits the molar ratio of hydrogen bond acceptors to hydrogen bond donors within a certain range, resulting in a lower viscosity of the superalkaline eutectic solvent, thereby improving mass transfer performance and ultimately enhancing the carbon dioxide absorption efficiency. Attached Figure Description
[0017] Figure 1 The thermal decomposition curves of the superalkali eutectic solvents prepared in Examples 1-4 are shown. Figure 2 The Fourier transform infrared spectrum and NMR H spectrum of Example 1; Figure 3 The Fourier transform infrared spectrum and nuclear magnetic resonance (NMR) H spectrum of Example 2; Figure 4 The Fourier transform infrared spectrum and NMR H spectrum of Example 3; Figure 5 The Fourier transform infrared spectrum and NMR H spectrum of Example 4; Figures 2-5 The image on the left is the Fourier transform infrared spectrum, and the image on the right is the nuclear magnetic resonance (NMR) H-spectrum. Detailed Implementation
[0018] This invention provides a superalkaline eutectic solvent comprising a hydrogen bond acceptor and a hydrogen bond donor.
[0019] In this invention, the hydrogen bond acceptor comprises 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) and / or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), specifically 1,5-diazabicyclo[4.3.0]non-5-ene or 1,8-diazabicyclo[5.4.0]undec-7-ene; the hydrogen bond donor comprises ethanolamine (MEA) and / or 3-amino-1-propanol (AP), specifically ethanolamine or 3-amino-1-propanol.
[0020] In this invention, the molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is 1:4 to 10, specifically 1:4, 1:6 or 1:8.
[0021] In one specific embodiment of the present invention, the superalkaline eutectic solvent may include 1,5-diazabicyclo[4.3.0]non-5-ene and ethanolamine; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene to ethanolamine is 1:4, 1:6, 1:8, or 1:10. In another specific embodiment of the present invention, the superalkaline eutectic solvent may include 1,5-diazabicyclo[4.3.0]non-5-ene and 3-amino-1-propanol; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene to 3-amino-1-propanol is 1:4, 1:6, 1:8, or 1:10. In one specific embodiment of the present invention, the superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and ethanolamine; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene to ethanolamine is 1:4, 1:6, 1:8, or 1:10. In another specific embodiment of the present invention, the superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and 3-amino-1-propanol; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene to 3-amino-1-propanol is 1:4, 1:6, 1:8, or 1:10.
[0022] In one specific embodiment of the present invention, the water content of the superalkaline eutectic solvent can be below 0.3 wt%, specifically 0.18 wt%, 0.19 wt%, 0.21 wt%, 0.23 wt%, or 0.25 wt%; the decomposition temperature of the superalkaline eutectic solvent can be 117.5~155.6℃, specifically 117.5℃, 128.10℃, 152.325℃, or 155.64℃; the viscosity of the superalkaline eutectic solvent can be 60~131 mPa·s, specifically 63.41 mPa·s, 64.36 mPa·s, 72.82 mPa·s, 79.32 mPa·s, 85.58 mPa·s, 115.25 mPa·s, or 130.83 mPa·s. The super-alkaline eutectic solvent provided by this invention has a low viscosity. Low viscosity can enhance the CO2 diffusion rate and mass transfer coefficient at the gas-liquid interface, increase the contact frequency between active amine groups (-NH2) and CO2 molecules in the solution, and accelerate the chemical absorption reaction kinetics.
[0023] In one specific embodiment of the present invention, the density of the superalkaline eutectic solvent can be 0.9~1.1 g·cm³. -3 Specifically, it can be expressed as 0.99 g·cm³.-3 1g·cm -3 1.002 g·cm -3 1.013 g·cm -3 Or 1.017 g·cm -3 .
[0024] The superalkali eutectic solvent provided by this invention has good thermal stability and can operate stably under medium temperature conditions; it has low viscosity and can efficiently capture CO2, reducing the energy consumption of carbon dioxide capture.
[0025] This invention also provides a method for preparing the superalkali eutectic solvent described in the above technical solution, comprising the following steps: The superbasic eutectic solvent is obtained by mixing the hydrogen bond acceptor and the hydrogen bond donor.
[0026] In this invention, unless otherwise specified, all materials are conventional commercially available products.
[0027] As a specific embodiment of the present invention, the purity of the hydrogen bond acceptor and the hydrogen bond donor can be above 98%, specifically 99% or 99.99%.
[0028] In one specific embodiment of the present invention, the mixing can be carried out under magnetic stirring, and the mixing temperature can be 20~35℃, specifically 25℃, 28℃, 30℃ or 32℃; the mixing time can be 4~5h, specifically 4.5h. In another specific embodiment of the present invention, the mixing process may further include: allowing the mixed system to stand for 4~6h, specifically 5h; the standing temperature can be the same as the mixing temperature.
[0029] The present invention also provides the application of the superalkali eutectic solvent described in the above technical solution in the absorption of carbon dioxide.
[0030] As a specific embodiment of the present invention, the method for absorbing carbon dioxide using the superalkali eutectic solvent may include the following steps: passing carbon dioxide into the superalkali eutectic solvent for carbon dioxide absorption; the flow rate of the carbon dioxide can be 30~40 mL / min, specifically 35 mL / min; the absorption temperature can be 295.15~301.15 K, specifically 22℃, 25℃ or 28℃; the absorption pressure can be 100~105 kPa, specifically 101 kPa, 102 kPa or 104 kPa; the absorption capacity can be 4.1280~5.8841 mol·kg⁻¹. -1 Specifically, it can be expressed as 4.128 mol·kg⁻¹ -1 4.4221 mol·kg -14.7443 mol·kg -1 4.9832 mol·kg -1 5.4930 mol·kg -1 Or 5.9 mol·kg -1 .
[0031] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.
[0032] The materials used in the embodiments are shown in Table 1, and the instruments used in the embodiments are shown in Table 2.
[0033] Table 1 Material Summary Table in the Embodiment
[0034] Table 2 Summary of instruments used in the embodiments
[0035] Example 1 9.9344 g (0.08 mol) of DBN and 19.5456 g (0.32 mol) of MEA were added to a round-bottom flask and mixed with a thermostatic magnetic stirrer at 298.15 K for 4.5 h. The mixture was then allowed to stand at room temperature (298.15 K) for 5 h to obtain a DBN:MEA (1:4) superalkaline eutectic solvent.
[0036] Example 2 The superalkali eutectic solvent was prepared according to the method of Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 9.9344 g (0.08 mol) DBN and the hydrogen bond donor was 24.0352 g (0.32 mol) AP. The resulting superalkali eutectic solvent was denoted as DBN:AP (1:4).
[0037] Example 3 The superbase eutectic solvent was prepared according to the method in Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 12.1792 g (0.08 mol) DBU and the hydrogen bond donor was 19.5456 g (0.32 mol) MEA. The resulting superbase eutectic solvent was denoted as DBU:MEA (1:4).
[0038] Example 4 The superbase eutectic solvent was prepared according to the method in Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 12.1792 g (0.08 mol) DBU and the hydrogen bond donor was 24.0352 g (0.32 mol) AP. The resulting superbase eutectic solvent was denoted as DBU:AP (1:4).
[0039] Example 5 The superalkali eutectic solvent was prepared according to the method in Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 6.209 g (0.05 mol) DBN and the hydrogen bond acceptor was 18.324 g (0.3 mol) MEA. The resulting superalkali eutectic solvent was denoted as DBN:MEA (1:6).
[0040] Example 6 The superalkali eutectic solvent was prepared according to the method in Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 6.209 g (0.05 mol) DBN and the hydrogen bond acceptor was 24.432 g (0.4 mol) MEA. The resulting superalkali eutectic solvent was denoted as DBN:MEA(1:8).
[0041] Example 7 The superalkali eutectic solvent was prepared according to the method in Example 1, except that the types and amounts of hydrogen bond acceptors and hydrogen bond donors were different. Specifically, the hydrogen bond acceptor was 6.209 g (0.05 mol) DBN and the hydrogen bond acceptor was 30.540 g (0.5 mol) MEA. The resulting superalkali eutectic solvent was denoted as DBN:MEA (1:10).
[0042] The moisture content of the superalkali eutectic solvents prepared in Examples 1-7 was determined using a coulometric moisture analyzer (SF-3 trace moisture analyzer), and the results are listed in Table 3.
[0043] The thermal stability of the superalkali eutectic solvents prepared in Examples 1-4 was tested using a simultaneous thermal analyzer (e.g., STA 800). The obtained thermal decomposition temperatures are listed in Table 3; the obtained thermal decomposition curves are shown in Table 3. Figure 1 As shown.
[0044] The viscosity of the superalkali eutectic solvents prepared in Examples 1-7 was measured using a DV-II viscometer, and the results are listed in Table 3.
[0045] The densities of the superalkali eutectic solvents prepared in Examples 1-7 were measured using a Digipol-D50 liquid density meter, and the results are listed in Table 3.
[0046] Table 3. Physicochemical properties of the superalkali eutectic solvents prepared in Examples 1-7
[0047] As can be seen from Table 3, the superalkali eutectic solvent provided by the present invention has low viscosity and good thermal stability.
[0048] Test example: The set temperature was maintained at 298.15 K (25 °C) in a constant temperature water bath. 10 g of the superalkali eutectic solvent prepared in Examples 1 to 7 was loaded into the absorption bottle. Pure CO2 gas was introduced at 35 mL / min under normal pressure (101.325 kPa). The flow rate was controlled by a mass flow meter. The mass of the absorption bottle was weighed using an electronic balance every 30 min. When the mass change was <0.001 g, it was considered that saturation absorption had been reached. The CO2 absorption was calculated based on the mass change. The results are listed in Table 4.
[0049] Table 4 shows the carbon dioxide absorption of the superalkali eutectic solvents prepared in Examples 1-7.
[0050] Fourier transform infrared (FTIR) analysis was performed on MEA, AP, DBN, DBU, the prepared superalkali eutectic solvent (DESs), and the superalkali eutectic solvent after carbon dioxide absorption (DESs+CO2) in Examples 1-4. 1 H NMR detection yielded the Fourier transform infrared spectrum and H NMR spectrum as follows: Figures 2-5 As shown, Figure 2 The Fourier transform infrared spectrum and NMR H-spectrum of Example 1 are shown. Figure 3 The Fourier transform infrared spectrum and NMR H-spectrum of Example 2 are shown. Figure 4 The Fourier transform infrared spectrum and NMR H spectrum of Example 3 are shown. Figure 5 The Fourier transform infrared spectrum and NMR H spectrum of Example 4 are shown. Figures 2-5 The image on the left is the Fourier transform infrared spectrum, and the image on the right is the nuclear magnetic resonance (NMR) H-spectrum.
[0051] Depend on Figure 2 It can be seen that comparing the pure HBA and HBD substances with those after synthesis of DESs, and the Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra of DESs before and after CO2 absorption, after the formation of DESs, DBN at 1650 cm⁻¹... -1 The sharp C=N peak at 2860 cm⁻¹ exhibits a redshift, and MEA at 2860 cm⁻¹... -1 The red shift of the alkyl peak at 3290 cm⁻¹ also confirms the hydrogen bonding in the system, and the peak at 3290 cm⁻¹... -1 and 3355cm -1 The broadening of the -OH vibrational band at 1572 cm⁻¹ further reflects the enhancement of the hydrogen bond network. After CO₂ absorption, the band at 1572 cm⁻¹...-1 A new peak appeared at [location], corresponding to carbamate (–NHCOO). - The asymmetric stretching vibrations of CO2 indicate a chemical reaction between CO2 and amine groups. (The text abruptly ends here, so the translation also ends here.) -1 In the region, the CO stretching vibration peak was significantly enhanced, further confirming the formation of the carbamate structure. The 1H NMR spectrum showed a chemical shift in the -CH2 peaks originally located at 3.52 ppm and 2.66 ppm after the synthesis of DBN-MEA (1:4) eutectic solvent, possibly related to changes in the surrounding hydrogen bond network. After CO2 absorption, the -CH2 peak shifted to a lower field, and a new peak appeared at 3.10 ppm, representing the proton signal of the -CH2 group in the newly formed carbamate, indicating that the formation of carbamate from the amine group and CO2 is a chemisorption process.
[0052] Depend on Figure 3 It can be seen that after the formation of DESs, the DBN is at 1650cm. -1 The sharp C=N peak at 2860 cm⁻¹ exhibits a redshift, and AP is at 2860 cm⁻¹. -1 The red shift of the alkyl peak at 3290 cm⁻¹ also confirms the hydrogen bonding in the system, and the peak at 3290 cm⁻¹ further confirms this. -1 and 3355cm -1 The broadening of the -OH vibrational band at 1572 cm⁻¹ further reflects the enhancement of the hydrogen bond network. After CO₂ absorption, the band at 1572 cm⁻¹... -1 A new peak appeared at [location], corresponding to carbamate (–NHCOO). - The asymmetric stretching vibrations of CO2 indicate a chemical reaction between CO2 and amine groups. (The text abruptly ends here, so the translation also ends here.) -1 In the region, the CO stretching vibration peak was significantly enhanced, further confirming the formation of the carbamate structure. The 1H NMR spectrum showed that after the synthesis of the DBN-AP (1:4) eutectic solvent, the -CH2 peaks originally located at 3.64 ppm, 2.68 ppm, and 1.67 ppm underwent chemical shifts, which are related to changes in the surrounding hydrogen bond network. After CO2 absorption, the -CH2 peak shifted to a lower field overall, and a new peak appeared at 3.05 ppm, representing the proton signal of the -CH2 group in the newly formed carbamate.
[0053] Depend on Figure 4 It can be seen that after the formation of DES, the NH group of AP is located at 1615 cm⁻¹ with DBU. -1 The C=N stretching peaks overlap. MEA at 2860 cm⁻¹ -1 The redshift of the alkyl and C=N stretching vibrations indicates the presence of hydrogen bonding in the system. Simultaneously, the broadening of the -OH vibrational band further reflects the enhancement of the hydrogen bonding network. After CO2 absorption, the vibrational band at 1572 cm⁻¹... -1 A new peak is generated, corresponding to –NHCOO -The asymmetric stretching vibrations of the group indicate its chemisorption behavior. Proton NMR spectroscopy revealed a chemical shift in the -CH2 peaks, originally located at 3.52 ppm and 2.66 ppm after the synthesis of DBU-MEA in the eutectic solvent, which is related to changes in the surrounding hydrogen bond network. After CO2 absorption, the -CH2 peak shifted to a lower field, and a new peak appeared at 3.02 ppm, representing the proton signal of the -CH2 group in the newly formed carbamate.
[0054] Depend on Figure 5 It can be seen that after the formation of DESs, DBU is at 1615 cm. -1 The sharp C=N peak at 2860 cm⁻¹ exhibits a redshift, and AP is at 2860 cm⁻¹. -1 The red shift of the alkyl peak at 3290 cm⁻¹ also confirms the hydrogen bonding in the system, and the peak at 3290 cm⁻¹ further confirms this. -1 and 3355cm -1 The broadening of the -OH vibrational band at 1572 cm⁻¹ further reflects the enhancement of the hydrogen bond network. After CO₂ absorption, the band at 1572 cm⁻¹... -1 A new peak appeared at [location], corresponding to carbamate (–NHCOO). - The asymmetric stretching vibrations of CO2 indicate a chemical reaction between CO2 and amine groups. (The text abruptly ends here, so the translation also ends here.) -1 In the region, the CO stretching vibration peak was significantly enhanced, further confirming the formation of the carbamate structure. The 1H NMR spectrum showed that the -CH2 peaks originally located at 3.64 ppm, 2.68 ppm, and 1.67 ppm after the synthesis of DBU-AP in the eutectic solvent underwent chemical shifts, which are related to changes in the surrounding hydrogen bond network. After CO2 absorption, the -CH2 peak shifted to a lower field overall, and a new peak appeared at 2.97 ppm, representing the proton signal of the -CH2 group in the newly formed carbamate.
[0055] FT-IR analysis revealed that in these systems, both the -OH and -NH2 regions shifted after DES formation. The hydroxyl (-OH) and amino (-NH2) groups in the alkanolamine molecule could form hydrogen bonds, either individually or collaboratively, with the electron-rich nitrogen atoms in the DBU. Due to the stronger hydrogen-donating ability of the hydroxyl group, it preferentially formed hydrogen bonds; simultaneously, the amino group also participated in the hydrogen bond network, thus stabilizing the supramolecular system. The presence of multi-site hydrogen bonds significantly lowered the melting point of the mixture, enabling the system to form a stable deep eutectic solvent at room temperature.
[0056] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.
Claims
1. A super-basic eutectic solvent, characterized in that, Including hydrogen bond acceptors and hydrogen bond donors; The hydrogen bond acceptor includes 1,5-diazabicyclo[4.3.0]non-5-ene and / or 1,8-diazabicyclo[5.4.0]undec-7-ene; The hydrogen bond donors include ethanolamine and / or 3-amino-1-propanol; The molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is 1:4~10.
2. The super-basic eutectic solvent according to claim 1, characterized in that, The super-alkaline eutectic solvent has a water content of less than 0.3 wt%, a decomposition temperature of 117.5~155.6℃, and a viscosity of 60~131 mPa·s.
3. The superalkaline eutectic solvent according to claim 1 or 2, characterized in that, The superalkaline eutectic solvent comprises 1,5-diazabicyclo[4.3.0]non-5-ene and ethanolamine; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene to ethanolamine is 1:4, 1:6, 1:8 or 1:
10.
4. The superalkaline eutectic solvent according to claim 1 or 2, characterized in that, The superalkaline eutectic solvent comprises 1,5-diazabicyclo[4.3.0]non-5-ene and 3-amino-1-propanol; the molar ratio of 1,5-diazabicyclo[4.3.0]non-5-ene and 3-amino-1-propanol is 1:4, 1:6, 1:8 or 1:
10.
5. The superalkaline eutectic solvent according to claim 1 or 2, characterized in that, The superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and ethanolamine; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene and ethanolamine is 1:4, 1:6, 1:8 or 1:
10.
6. The superalkaline eutectic solvent according to claim 1 or 2, characterized in that, The superalkaline eutectic solvent comprises 1,8-diazabicyclo[5.4.0]undec-7-ene and 3-amino-1-propanol; the molar ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene and 3-amino-1-propanol is 1:4, 1:6, 1:8 or 1:
10.
7. The method for preparing the superalkali eutectic solvent according to any one of claims 1 to 6, characterized in that, Includes the following steps: The superbasic eutectic solvent is obtained by mixing the hydrogen bond acceptor and the hydrogen bond donor.
8. The preparation method according to claim 7, characterized in that, The mixing is carried out under magnetic stirring conditions, the mixing temperature is 20~35℃, and the mixing time is 4~5h; The mixing process also includes: allowing the mixed system to stand for 4-6 hours.
9. The use of the superalkali eutectic solvent according to any one of claims 1 to 6 in the absorption of carbon dioxide.
10. The application according to claim 9, characterized in that, The temperature at which carbon dioxide is absorbed using the aforementioned superalkali eutectic solvent is 295.15~301.15K, the pressure is 100~105kPa, and the absorption capacity is 4.1280~5.8841mol·kg⁻¹. -1 .