Sulfolane-based nonionic deep eutectic solvent absorbent and preparation method thereof

Abstract

The invention discloses a sulfolane non-ionic deep eutectic solvent absorbent and a preparation method thereof, the sulfolane non-ionic deep eutectic solvent absorbent comprises a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is one of triethylene glycol, levulinic acid, triethanolamine and diethylene glycol monobutyl ether; the hydrogen bond receptor is sulfolane; the hydroxyl group provides hydrogen bond donor capability, and the alkyl group interacts with a non-polar region of dichloromethane through Van der Waals' force, and experiments show that the non-polar region of DGBE and a hydrophobic part of dichloromethane form wide Van der Waals' force, and the Van der Waals' force cooperates with the hydrogen bond effect of SUL to improve the overall absorption efficiency. In addition, the fluidity of the solvent is remarkably improved due to the low viscosity of the DGBE, mass transfer limitation caused by high viscosity is avoided, and the DGBE has excellent performance in a continuous absorption tower.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental governance, and particularly to a sulfolane-based nonionic deep eutectic solvent absorbent and a preparation method thereof. Background Art

[0002] Dichloromethane (DCM), as a widely used organic solvent, plays an important role in fields such as chemical engineering and plastic manufacturing. However, its high volatility causes exhaust gas emissions to pose a serious threat to the environment and human health. Existing DCM waste gas treatment technologies include catalytic oxidation, biodegradation, membrane separation, and solvent absorption methods. Among them, the solvent absorption method has attracted much attention due to its advantages such as simple operation, strong adaptability, and recyclability of the absorbent. However, due to problems such as high viscosity, low diffusion coefficient, high synthesis cost, and poor biodegradability of ionic liquids (ILs), their industrial application is limited. Therefore, it is urgent to develop absorbents with low price and outstanding absorption capacity.

[0003] In recent years, deep eutectic solvents (DESs), as a new type of green solvent, have become a research hotspot due to their low toxicity, strong designability, and simple preparation. Nonionic DESs have lower viscosity and environmental friendliness compared to ionic DESs, showing great potential in the field of gas absorption. However, existing research mainly focuses on ionic DESs, and there are still deficiencies in the application of nonionic DESs in DCM absorption. Therefore, developing a DCM absorbent based on nonionic DESs and clarifying its absorption mechanism are the keys to realizing the green treatment of DCM waste gas. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a sulfolane-based nonionic deep eutectic solvent absorbent and a preparation method thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a sulfolane-based nonionic deep eutectic solvent absorbent, comprising: a hydrogen bond donor and a hydrogen bond acceptor,

[0006] The hydrogen bond donor is one of triethylene glycol, levulinic acid, triethanolamine, and diethylene glycol butyl ether;

[0007] The hydrogen bond acceptor is sulfolane.

[0008] In a preferred embodiment of the present invention, the molar mass ratio between the hydrogen bond acceptor and the hydrogen bond donor is 1:1 - 3.

[0009] A preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent, comprising the following steps:

[0010] S1: Heat the hydrogen bond acceptor and hydrogen bond donor in the deep eutectic solvent, stir and mix them to form a uniform sulfolane-based nonionic deep eutectic solvent.

[0011] S2: Dry the sulfolane-based nonionic deep eutectic solvent obtained in S1 to obtain a sulfolane-based nonionic deep eutectic solvent absorbent.

[0012] In a preferred embodiment of the present invention, in S1, the heating temperature is 65°C - 75°C, the stirring speed is 300 - 600 r / min, and the time is 1 - 2 h.

[0013] In a preferred embodiment of the present invention, in S2, the drying temperature is 60 - 90°C, and the drying time is 12 - 24 h.

[0014] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0015] (1) The present invention provides a sulfolane-based nonionic deep eutectic solvent absorbent and its preparation method. By using sulfolane (SUL) as the hydrogen bond acceptor to prepare the deep eutectic solvent absorbent, sulfolane has low toxicity and good biodegradability, meeting the design requirements of green solvents. The toxicity of SUL is significantly lower than that of traditional ionic liquids and some organic solvents, and its decomposition rate in the environment is relatively high, reducing the long-term pollution risk. In addition, its synthesis process is mature and the raw materials are easily available, reducing the cost of industrial applications. During the actual absorption of dichloromethane (DCM), the sulfonyl group of SUL has a strong hydrogen bond accepting ability, which can form stable hydrogen bonds with the hydrogen atoms of dichloromethane, significantly improving the absorption efficiency, and thus obtaining an absorbent that combines environmental friendliness and high absorption capacity.

[0016] (2) The present invention provides a sulfolane-based nonionic deep eutectic solvent absorbent and its preparation method. By using diethylene glycol butyl ether (DGBE) as the hydrogen bond donor for preparing the nonionic deep eutectic solvent, DGBE has multiple functional groups such as hydroxyl and alkyl due to its molecular structure itself. These structures endow it with unique polar and nonpolar dual characteristics. The hydroxyl group provides the hydrogen bond donor ability, while the alkyl group interacts with the nonpolar region of DCM through van der Waals forces. It can be seen from the experiments that the nonpolar region of DGBE forms extensive van der Waals forces with the hydrophobic part of DCM, and cooperates with the hydrogen bond interaction of SUL to improve the overall absorption efficiency. In addition, the low viscosity property of DGBE significantly improves the fluidity of the solvent, avoiding mass transfer limitations caused by high viscosity, and making it perform excellently in a continuous absorption tower.

[0017] (3) The present invention provides a sulfolane-based nonionic deep eutectic solvent absorbent and its preparation method. By using sulfolane as a hydrogen bond acceptor, the absorbent does not require complex ionization steps during the synthesis process and can form a homogeneous liquid only through physical mixing, with simple operation and low energy consumption. In addition, the nonionic deep eutectic solvent has better biodegradability, reducing the environmental burden. By adjusting the molar ratio of the hydrogen bond acceptor (HBA) to the hydrogen bond donor (HBD), the solvent density and viscosity can be further optimized, enhancing the adaptability to high-concentration DCM waste gas. This design flexibility provides a broad space for the development of customized solvents.

[0018] (4) The present invention provides a sulfolane-based nonionic deep eutectic solvent absorbent and its preparation method through the interaction mechanism between the hydrogen bond acceptor SUL and the hydrogen bond donor (DGBE). The oxygen atom of SUL acts as a strong hydrogen bond acceptor to bind with the hydrogen atom of DCM, while the nonpolar region in the HBDs enhances adsorption through van der Waals forces. The electrostatic interaction is highly correlated with the hydrogen bond strength, providing a theoretical basis for optimizing the solvent design. This precise regulation ability at the molecular level ensures the high efficiency and scalability of the absorbent. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0020] Figure 1 It is the density map of the sulfolane-based nonionic deep eutectic solvent prepared with the molar ratio of SUL and TEG, LEV, TEOA, DGBE ranging from 1:1 to 1:3.

[0021] Figure 2 It is the viscosity map of the sulfolane-based nonionic deep eutectic solvent prepared with the molar ratio of SUL and TEG, LEV, TEOA, DGBE ranging from 1:1 to 1:3.

[0022] Figure 3 It is the IGM map analysis of the quantum chemical calculation of the interaction between SUL and TEG, LEV, TEOA, DGBE, and the energy map of the interaction between two molecules through hydrogen bonds.

[0023] Figure 4 It is the absorption efficiency map of the sulfolane-based nonionic deep eutectic solvent absorbent of the present invention for absorbing dichloromethane.

[0024] Figure 5This is the absorption efficiency graph of dichloromethane absorption in the absorption / desorption cycle of the sulfolane-based nonionic deep eutectic solvent (SUL-DGBE) of the present invention. Detailed implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the protection scope of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific situations.

[0029] As Figure 1 shown, a sulfolane-based nonionic deep eutectic solvent absorbent includes a hydrogen bond donor and a hydrogen bond acceptor.

[0030] The hydrogen bond donor is one of triethylene glycol (TEG), levulinic acid (LEV), triethanolamine (TEOA), and diethylene glycol butyl ether (DGBE);

[0031] The hydrogen bond acceptor (HBA) is sulfolane (SUL).

[0032] In the present invention, the molar mass ratio between the hydrogen bond acceptor and the hydrogen bond donor is 1:1 - 3.

[0033] A preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent includes the following steps:

[0034] S1: Heat and stir and mix the hydrogen bond acceptor and the hydrogen bond donor in the deep eutectic solvent to form a uniform sulfolane-based nonionic deep eutectic solvent;

[0035] S2: Dry the sulfolane-based nonionic deep eutectic solvent obtained in S1 to obtain a sulfolane-based nonionic deep eutectic solvent absorbent.

[0036] In the present invention, in S1, the heating temperature is 70 °C, the stirring speed is 450 r / min, and the time is 1 - 2 h; in S2, the drying temperature is 60 - 90 °C, and the drying time is 12 - 24 h.

[0037] It should be noted that the prepared absorbent is used for dichloromethane (DCM) waste gas absorption experiment through a packed tower, and then the renewable performance of the absorbent is further explored through absorption / desorption cycle experiment. The operating temperature for the packed tower to absorb dichloromethane is 25 °C. The preparation steps of the deep eutectic solvent are as follows: Weigh the ring butyl sulfone and HBDs reagents with a fixed molar ratio mass, place them in a round bottom flask and mix, and prepare the absorbent through a water bath heating stirrer. The preparation temperature condition of the reagent is 70 °C. The dichloromethane waste gas treatment is realized through a packed tower absorption system, the operating temperature is 25 °C, and the number of solvent recycling times ≥ 10 times.

[0038] Example 1

[0039] The raw material dosage in this example is as follows:

[0040] Sulfolane (SUL) 0.37 mol

[0041] Triethylene glycol (TEG) 0.37 mol;

[0042] A 100 g mixed solution of SUL-TEG (1:1).

[0043] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0044] S1. Mix 0.37 mol of SUL with 0.37 mol of TEG reagent;

[0045] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir for 1 h under the conditions of 70 °C and 450 r / min to prepare a deep eutectic solvent;

[0046] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEG(1:1).

[0047] Example 2

[0048] The raw material dosage in this example is as follows:

[0049] Sulfolane (SUL) 0.24 mol

[0050] Triethylene glycol (TEG) 0.48 mol;

[0051] 100 g of the mixed solution of SUL-TEG(1:2).

[0052] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0053] S1. Mix 0.24 mol of SUL with 0.48 mol of TEG reagent;

[0054] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir for 1 h under the conditions of 70 °C and 450 r / min to prepare a deep eutectic solvent;

[0055] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEG(1:2).

[0056] Example 3

[0057] The raw material dosage in this example is as follows:

[0058] Sulfolane (SUL) 0.17 mol

[0059] Triethylene glycol (TEG) 0.51 mol;

[0060] 100 g of the mixed solution of SUL-TEG(1:3).

[0061] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0062] S1. Mix 0.17 mol of SUL with 0.51 mol of TEG reagent;

[0063] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0064] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEG(1:3).

[0065] Example 4

[0066] The raw material dosage in this example is as follows:

[0067] Sulfolane (SUL) 0.42 mol

[0068] Levulinic acid (LEV) 0.42 mol;

[0069] 100 g of the mixed solution of SUL-LEV(1:1).

[0070] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0071] S1. Mix 0.42 mol of SUL with 0.42 mol of LEV reagent;

[0072] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0073] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-LEV(1:1).

[0074] Example 5

[0075] The raw material dosage in this example is as follows:

[0076] Sulfolane (SUL) 0.28 mol

[0077] Levulinic acid (LEV) 0.56 mol;

[0078] 100 g of the mixed solution of SUL-LEV(1:2).

[0079] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0080] S1. Mix 0.28 mol of SUL with 0.56 mol of LEV reagent;

[0081] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0082] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-LEV(1:2).

[0083] Example 6

[0084] The raw material dosage in this example is as follows:

[0085] Sulfolane (SUL) 0.21 mol

[0086] Levulinic acid (LEV) 0.63 mol;

[0087] 100 g of the mixed solution of SUL-LEV(1:2).

[0088] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0089] S1. Mix 0.21 mol of SUL with 0.63 mol of LEV reagent;

[0090] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0091] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-LEV(1:3).

[0092] Example 7

[0093] The raw material dosage in this example is as follows:

[0094] Sulfolane (SUL) 0.37 mol

[0095] Triethanolamine (TEOA) 0.37 mol;

[0096] 100 g of the mixed solution of SUL-TEOA(1:1).

[0097] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0098] S1. Mix 0.37 mol of SUL with 0.37 mol of TEOA reagent;

[0099] S2. Place the mixed reagent in a flask and heat and stir it through a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0100] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEOA(1:1).

[0101] Example 8

[0102] The raw material dosage in this example is as follows:

[0103] Sulfolane (SUL) 0.24 mol

[0104] Triethanolamine (TEOA) 0.48 mol;

[0105] 100 g of the mixed solution of SUL-TEOA(1:2).

[0106] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0107] S1. Mix 0.24 mol of SUL with 0.48 mol of TEOA reagent;

[0108] S2. Place the mixed reagent in a flask and heat and stir it through a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0109] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEOA(1:2).

[0110] Example 9

[0111] The raw material dosage in this example is as follows:

[0112] Sulfolane (SUL) 0.17 mol

[0113] Triethanolamine (TEOA) 0.51 mol;

[0114] 100 g of the mixed solution of SUL-TEOA(1:3).

[0115] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0116] S1. Mix 0.17 mol of SUL with 0.51 mol of TEOA reagent;

[0117] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0118] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-TEOA(1:3).

[0119] Example 10

[0120] The raw material dosage in this example is as follows:

[0121] Sulfolane (SUL) 0.35 mol

[0122] Diethylene glycol butyl ether (DGBE) 0.35 mol;

[0123] 100 g of the mixed solution of SUL-DGBE(1:1).

[0124] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0125] S1. Mix 0.35 mol of SUL with 0.35 mol of DGBE reagent;

[0126] S2. Place the mixed reagent in a flask and heat and stir it with a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0127] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-DGBE(1:1).

[0128] Example 11

[0129] The raw material dosage in this example is as follows:

[0130] Sulfolane (SUL) 0.22 mol

[0131] Diethylene glycol butyl ether (DGBE) 0.44 mol;

[0132] 100 g of the mixed solution of SUL-DGBE(1:2).

[0133] According to the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0134] S1. Mix 0.22 mol of SUL with 0.44 mol of DGBE reagent;

[0135] S2. Place the mixed reagent in a flask and heat and stir it through a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0136] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining a deep eutectic solvent of SUL-DGBE (1:2).

[0137] Example 12

[0138] The raw material dosage in this example is as follows:

[0139] Sulfolane (SUL) 0.16 mol

[0140] Diethylene glycol butyl ether (DGBE) 0.48 mol;

[0141] 100 g of a mixed solution of SUL-DGBE (1:3).

[0142] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0143] S1. Mix 0.16 mol of SUL with 0.48 mol of DGBE reagent;

[0144] S2. Place the mixed reagent in a flask and heat and stir it through a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0145] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining a deep eutectic solvent of SUL-DGBE (1:3).

[0146] Example 13

[0147] The raw material dosage in this example is as follows:

[0148] Sulfolane (SUL) 0.13 mol

[0149] Diethylene glycol butyl ether (DGBE) 0.52 mol;

[0150] 100 g of a mixed solution of SUL-DGBE (1:4).

[0151] Based on the above raw materials, this example provides a preparation method of a sulfolane-based nonionic deep eutectic solvent absorbent. The specific steps are as follows:

[0152] S1. Mix 0.13 mol of SUL with 0.52 mol of DGBE reagent;

[0153] S2. Place the mixed reagent in a flask and heat and stir it through a magnetic stirring water bath. Heat and stir it at 70 °C and 450 r / min for 1 h to prepare a deep eutectic solvent;

[0154] S3. Place the prepared deep eutectic solvent in an oven at 80 °C and dry it for 12 h to remove moisture, obtaining the deep eutectic solvent of SUL-DGBE(1:4).

[0155] S4. Measure the viscosity of the prepared deep eutectic solvent SUL-DGBE(1:4) at 25 °C. The experimental results show that the viscosity of SUL-DGBE(1:4) under this condition is 9.2 mPa·s. Compared with 7.6 mPa·s of SUL-DGBE(1:3) in the figure, the viscosity increases. Through analysis, the high proportion of diethylene glycol butyl ether content may change the solvation ability in the deep eutectic solvent, affecting the intermolecular interaction. In the deep eutectic solvent formed by SUL-DGBE, sulfolane and diethylene glycol butyl ether molecules have weak interactions. During the process of the ratio of sulfolane to diethylene glycol butyl ether increasing from 1:1 to 1:3, diethylene glycol butyl ether acts as a hydrogen bond donor and interacts with the hydrogen bond acceptor sulfolane, so the viscosity of the solvent gradually decreases. When the ratio of sulfolane to diethylene glycol butyl ether reaches 1:4, the addition of excessive diethylene glycol butyl ether makes its own long-chain ether structure become the dominant component of the system, affecting the interaction between sulfolane and diethylene glycol butyl ether molecules, resulting in an increase in viscosity. Finally, according to the experimental data, the deep eutectic solvent with low viscosity has strong fluidity in the reaction system, promotes the diffusion of the absorbed waste gas, and improves the absorption efficiency of dichloromethane waste gas. At the same time, the deep eutectic solvent with low viscosity reduces energy consumption in practical applications and has good application prospects. To sum up, choosing the deep eutectic solvent SUL-DGBE(1:3) with low viscosity for further exploration can effectively enhance the mass transfer efficiency, improve the regeneration performance and reduce energy consumption.

[0156] Example 14

[0157] Reveal the interactions inside the DESs and between them and DCM through quantum chemical calculations (QC). IGM analyzes the weak interactions between molecules, which helps to observe and quantify the effects of these interactions on molecular behavior and properties.

[0158] Experimental Example 15

[0159] In the simulated industrial waste gas treatment system, in this experiment, four sulfolane-based nonionic deep eutectic solvent absorbents were respectively used to conduct continuous absorption experiments on dichloromethane through a packed tower with an inner diameter of 25 mm and a 4×4 mmθ ring packing height of 60 cm (under the conditions of 25°C and one standard atmosphere). From the results, it can be known that the SUL-DGBE deep eutectic solvent has the best absorption effect on dichloromethane. On this basis, the regenerability of this absorbent was verified through continuous absorption / desorption cycle experiments. After 10 cycles, the absorption capacity of the absorbent did not change significantly, confirming that the absorbent in this study has a certain regenerative capacity; its good dichloromethane absorption performance and regenerability prove that the SUL-DGBE(1:3) deep eutectic solvent is a promising waste gas treatment absorbent.

[0160] Based on the inspiration of the ideal embodiments of the present invention, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A sulfolane-based nonionic deep eutectic solvent absorbent, comprising: A hydrogen bond donor and a hydrogen bond acceptor, characterized in that The hydrogen bond donor is one of triethylene glycol, levulinic acid, triethanolamine and diethylene glycol butyl ether; The hydrogen bond acceptor is sulfolane.

2. The sulfolane-based nonionic deep eutectic solvent absorbent according to claim 1, characterized in that: The molar mass ratio between the hydrogen bond acceptor and the hydrogen bond donor is 1:1-3.

3. A method for preparing a sulfolane-based nonionic deep eutectic solvent absorbent, based on the method for preparing the absorbent according to claim 1-2, characterized in that: The following steps are involved: S1: heating the hydrogen bond acceptor and the hydrogen bond donor in the deep eutectic solvent, stirring and mixing, and forming a uniform sulfolane-based non-ionic deep eutectic solvent; S2: Drying the sulfolane-based nonionic deep eutectic solvent obtained in S1 to obtain a sulfolane-based nonionic deep eutectic solvent absorbent.

4. The method for preparing a sulfolane-based nonionic deep eutectic solvent absorbent according to claim 3, characterized in that: In S1, the heating temperature is 65°C-75°C, the stirring speed is 300-600r / min, and the time is 1-2h.

5. The method for preparing a sulfolane-based nonionic deep eutectic solvent absorbent according to claim 3, characterized in that: In S2, the drying temperature is 60-90°C and the drying time is 12-24h.

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