Exhaust gas treatment agent, method for producing the same, and use thereof

Abstract

The present application provides a kind of exhaust treatment agent and its preparation method and application, the raw material of the exhaust treatment agent includes the following weight fraction components: amine compound: 10-40 parts;And, alcohol ether compound: 20-60 parts.In the present application, amine substance and alcohol ether substance are used to absorb electrolyte exhaust gas based on catalytic reaction, which can accelerate the hydrolysis rate of trimethylfluorosilane, trimethylchlorosilane and dimethyl carbonate, etc. lipid, thereby strengthening the gas-liquid mass transfer rate and improving the processing efficiency.At the same time, the exhaust treatment agent of the present application is used under mild conditions, which has less equipment loss, and can be activated by adding alkaline reagent, so as to achieve recycling, and thus achieve the purpose of reducing cost.

Description

Technical Field

[0001] The present invention belongs to the field of environmental protection, and in particular relates to a waste gas treatment agent, a preparation method and an application thereof. Background Art

[0002] During the production process of lithium batteries, waste gas, waste water, waste residue and other wastes will inevitably be generated, polluting the environment.

[0003] The lithium battery production process primarily includes: 1. Plate Engineering—stirring, slurrying, coating, baking, roller pressing, slitting, and laser die-cutting; 2. Assembly Engineering—winding, JR preheating, short-circuit testing, pairing, welding, and vacuum drying; 3. Formation Engineering—liquid injection, high-temperature quiescent conditions, formation, welding, cell charging and discharging, aging testing, and lamination. The electrolyte waste gas generated by vacuum drying and liquid injection during the assembly and formation processes is complex and fluctuates widely in concentration. During treatment, this waste gas has either gone unidentified or been treated with simple processes like activated carbon or alkaline washing, which are not only cumbersome to maintain but also prone to exceeding emission standards. Disassembly and crushing of used lithium batteries during recycling also generates electrolyte waste gas. Current treatment technology primarily relies on traditional combustion, where the waste gas is burned and decomposed for emission. However, this also presents cumbersome maintenance and is expensive to handle, posing safety concerns.

[0004] Electrolyte waste gas consists of PF5, HF, and non-condensable substances such as DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), tris(trimethylsilyl)borate, trimethylfluorosilane, methanol, and ethanol, with volatile organic compounds and inorganic acids being the main components. Currently, electrolyte waste gas is treated by a semi-dry deacidification tower (CFB) combined with a bag filter or a multi-stage alkaline scrubber to remove inorganic acids, particulate matter, and some volatile organic compounds. Combustion is then used to remove most of the volatile organic compounds. However, this treatment technology is expensive and cannot remove most of the fluorine and silicon elements. For example, trimethylfluorosilane (generally accounting for more than 30%) in waste gas lacks a suitable alkaline absorbent when used in either a deacidification tower or an alkaline scrubber. Furthermore, treatment efficiency is still low under high pH conditions (competitive hydrolysis occurs with lipids and other substances, with lipids being preferentially hydrolyzed). This can corrode equipment and introduce new safety issues. The comparative patent CN202111035109 is to separate phosphorus pentafluoride and trimethylfluorosilane in the tail gas by condensation, and then use alkali solution to react with trimethylfluorosilane liquid to prepare hexamethyldisiloxane for recycling. However, in fact, in the complex tail gas composition, the molecular sieve that absorbs siloxane is difficult to desorb and recycle. Non-polar substances compete with it for adsorption, especially lipid substances with a relatively high content. The adsorbent will be saturated quickly, and due to the high investment and operating costs, the low-temperature condensation method is generally only economically feasible under high flow and high siloxane load conditions. When the combustion method is used, the HF generated by heat will corrode the zeolite runner, and the silicon-containing oxides generated by combustion will adhere to the heat storage body and cause blockage or adhere to the catalyst surface to cause catalyst deactivation. The direct combustion method is still unable to treat the generated fluoride and is costly. Summary of the Invention

[0005] The main purpose of the present invention is to provide a waste gas treatment agent and its preparation method and application, aiming to provide a waste gas treatment agent with high efficiency in treating electrolyte waste gas and low operating cost.

[0006] To achieve the above object, the present invention provides a waste gas treatment agent, wherein the raw materials of the waste gas treatment agent include the following components in parts by weight:

[0007] Amine compound: 10 to 40 parts; and

[0008] Alcohol ether compound: 20 to 60 parts.

[0009] Optionally, the amine compound contains a hydroxyl group; and / or,

[0010] The raw materials of the waste gas treatment agent further include 10 to 40 parts by weight of water; and / or,

[0011] The weight proportion of the amine compound is 30 to 40 parts, and the weight proportion of the alcohol ether compound is 32 to 60 parts.

[0012] Optionally, the amine compound includes at least one of N-methyldiethanolamine, tetramethylammonium hydroxide, 2-(methylamino)ethanol, ethanolamine, methoxypolyethylene glycolamine and tetraethylenepentamine; and / or,

[0013] The alcohol ether compound includes at least one of polyethylene glycol dimethyl ether, diethylene glycol dimethyl ether, and polyethylene glycol diallyl ether; and / or,

[0014] The pH of the waste gas treatment agent is 8-10.

[0015] Optionally, the amine compound includes at least one of N-methyldiethanolamine, tetramethylammonium hydroxide and methoxypolyethylene glycolamine; and / or,

[0016] The alcohol ether compound includes polyethylene glycol dimethyl ether.

[0017] Optionally, the amine compound includes N-methyldiethanolamine.

[0018] Optionally, the exhaust gas treatment agent includes the following raw materials in the following weight percentages:

[0019] N-methyldiethanolamine: 20 to 30 parts;

[0020] Tetramethylammonium hydroxide: 10 to 15 parts;

[0021] Methoxypolyethylene glycol amine: 3 to 8 parts;

[0022] Polyethylene glycol dimethyl ether: 30 to 40 parts; and

[0023] Water: 20 to 35 parts.

[0024] In addition, the present invention also provides a method for preparing the above-mentioned waste gas treatment agent, which comprises the following steps:

[0025] The amine compound and the alcohol ether compound are mixed to obtain the exhaust gas treating agent.

[0026] In addition, the present invention also provides a method for treating electrolyte waste gas, which uses the above-mentioned waste gas treatment agent to absorb the electrolyte waste gas.

[0027] Optionally, the treatment temperature when using the waste gas treatment agent to treat the absorbed electrolyte waste gas is 20°C to 50°C.

[0028] Optionally, after the step of using the waste gas treatment agent to absorb the electrolyte waste gas, the method further comprises:

[0029] When the absorption rate of the waste gas treatment agent for the electrolyte waste gas decreases, adding alkaline solution to the waste gas treatment agent for activation;

[0030] The activated waste gas treatment agent is used to absorb the electrolyte waste gas again.

[0031] The present invention utilizes amines and alcohol ethers to absorb electrolyte waste gas through a catalytic reaction, accelerating the hydrolysis of lipids such as trimethylfluorosilane, trimethylchlorosilane, and dimethyl carbonate, thereby enhancing gas-liquid mass transfer and improving treatment efficiency. Furthermore, the waste gas treatment agent of the present invention operates under mild conditions, minimizes equipment loss, and can be activated by the addition of an alkaline reagent, enabling reuse and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a composition analysis diagram of the gas to be treated before treatment;

[0034] Figure 2 This is a composition analysis diagram of the gas to be treated after being treated with the waste gas treatment agent in Example 1;

[0035] Figure 3 This is a component analysis diagram of the gas to be treated after being treated with the waste gas treatment agent in comparative example 2.

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0038] It should be noted that, in the embodiments, those without specifying specific conditions, are carried out according to conventional conditions or the conditions recommended by the manufacturer. Those for reagents or instruments used that do not specify the manufacturer are conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes schemes A, B, or A and B that meet the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those of ordinary skill in the art. When the combination of the technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work belong to the scope of protection of the present invention.

[0039] In view of the technical defects of low treatment efficiency and high cost in existing electrolyte waste gas treatment methods, the present invention provides a waste gas treatment agent, which includes the following components in parts by weight:

[0040] Amine compound: 10 to 40 parts; and

[0041] Alcohol ether compound: 20 to 60 parts.

[0042] The advantages of the absorption method include simple equipment and processes, stable absorption, and the ability to recover organic solvents. It is suitable for a variety of organic waste gases and is particularly effective for treating large air volumes, medium-to-high concentrations of organic waste gases at room temperature. It is also low-cost and has the potential to convert pollutants into products and recover organic solvents, making it an economical option that aligns with clean production principles. However, existing absorbents primarily rely on surfactants to capture and absorb gases. This reliance on surfactants for absorption produces large amounts of foam, which is not conducive to recovery and utilization.

[0043] In the present invention, the use of amine substances and alcohol ether substances to absorb electrolyte waste gas is based on a catalytic reaction, which can accelerate the hydrolysis rate of lipids such as trimethylfluorosilane, trimethylchlorosilane and dimethyl carbonate, thereby enhancing the gas-liquid mass transfer rate and improving the treatment efficiency. The reaction principle is shown in the following formula: when the halogen silane waste gas diffuses from the gas phase to the liquid film, passes through the membrane pores to the gas-liquid interface, and enters the liquid film boundary layer under the driving force of the concentration difference, the halogen silane waste gas alcohol ether compounds and amine compounds in the liquid film boundary layer, because the halogen silane waste gas cannot directly react with alcohol ether, it can only react with amine compounds, and the reaction with amine compounds is a rapid reaction. Therefore, most of the halogen silane waste gas reacts with amine compounds to generate zwitterionic products, and continues to diffuse into the main body of the liquid phase. The zwitterionic products undergo proton migration with the alcohol ether in the main body, and the zwitterionic products are converted into amino ions. The amino ions are then hydrolyzed, and the groups are hydroxylated. At the same time, the amino compounds are reduced, and the reduced amino compounds quickly return to the interface to accept the diffused trimethylfluorosilane and react with it quickly. In this way, the activator becomes a carrier of trimethylfluorosilane, and the activation effect essentially accelerates the mass transfer rate of trimethylfluorosilane. The waste gas treatment agent of the present invention is used under mild conditions, has low equipment loss, and can be activated by adding an alkaline reagent after the treatment efficiency is reduced, so as to achieve reuse and further reduce costs.

[0044]

[0045] It should be noted that, based on the above reaction principle, the amine compound includes at least one of N-methyldiethanolamine, tetramethylammonium hydroxide, 2-(methylamino)ethanol, ethanolamine, methoxypolyethylene glycolamine and tetraethylenepentamine.

[0046] In some embodiments, the amine compound contains a hydroxyl group. This can further enhance the efficiency of the reaction with halogenated silane gases. The research team also discovered that the inclusion of N-methyldiethanolamine in the amine compound further enhanced the efficiency of electrolyte waste gas treatment. Furthermore, the optimal treatment efficiency was achieved when N-methyldiethanolamine, tetramethylammonium hydroxide, and methoxypolyethylene glycolamine were included.

[0047] In some embodiments, the exhaust gas treatment agent further comprises 10 to 40 parts by weight of water. The addition of water further hydrolyzes the amine compound, increases the hydroxide content in the system, and enhances the reaction efficiency between the gas and the system.

[0048] In some embodiments, the weight ratio of the amine compound is 30 to 40 parts, and the weight ratio of the alcohol ether compound is 32 to 60 parts. The above-mentioned content of the amine compound and the alcohol ether compound further improves the absorption rate of trimethylfluorosilane and the absorption rate of lipids such as dimethyl carbonate.

[0049] In some embodiments, the alcohol ether compound includes at least one of polyethylene glycol dimethyl ether, diethylene glycol dimethyl ether, and polyethylene glycol diallyl ether. Selecting these alcohol ether compounds can further improve the exhaust gas absorption efficiency. Specifically, the alcohol ether compound includes polyethylene glycol dimethyl ether, which has the best treatment efficiency.

[0050] In some embodiments, the pH of the exhaust gas treatment agent is 8 to 10. When the pH of the exhaust gas treatment agent is 8 to 10, the treatment efficiency can be further improved while ensuring that the equipment reacts under mild conditions without damaging the equipment.

[0051] It should be noted that, in the present invention, if the alkalinity of the waste gas treatment agent is too low, sodium hydroxide or potassium hydroxide can be used to adjust it. In the present invention, since the content of alkaline substances for pH adjustment is very small, it is not included in the weight of the raw materials of the waste gas treatment agent.

[0052] In some embodiments, the exhaust gas absorbent includes the following raw materials in parts by weight:

[0053] N-methyldiethanolamine: 20 to 30 parts;

[0054] Tetramethylammonium hydroxide: 10 to 15 parts;

[0055] Methoxypolyethylene glycol amine: 3 to 8 parts;

[0056] Polyethylene glycol dimethyl ether: 30 to 40 parts; and

[0057] Water: 20 to 35 parts. When the above composition is compounded, the waste gas treatment efficiency is further improved, and the absorption efficiency of trimethylfluorosilane can be increased to more than 85%, and the absorption efficiency of dimethyl carbonate and ethyl methyl carbonate can be increased to more than 90%.

[0058] It should be noted that the exhaust gas treatment agent of the present invention has a total of 100 parts of raw materials. When the total of the raw materials is 100 parts, the concentration of the effective components can reach a certain range, thereby improving the treatment efficiency of the electrolyte waste gas.

[0059] In addition, the present invention also provides a method for preparing the above-mentioned waste gas treatment agent, which comprises the following steps:

[0060] The amine compound and the alcohol ether compound are mixed to obtain the exhaust gas treatment agent. Specifically, water is first used as a solvent to prepare solutions of the amine compound and the alcohol ether compound respectively, and then the solutions are mixed, and a base is added to adjust the pH.

[0061] In addition, the present invention also provides a method for treating electrolyte waste gas, which uses the above-mentioned waste gas treatment agent to absorb the electrolyte waste gas.

[0062] By using the above-mentioned waste gas treatment agent to treat electrolyte waste gas, the electrolyte can be absorbed based on a catalytic reaction, with high treatment efficiency, mild reaction, and low equipment loss.

[0063] In some embodiments, the treatment temperature when using the waste gas treatment agent to treat the absorbed electrolyte waste gas is 20° C. to 50° C. The treatment efficiency can be further improved at 20° C. to 50° C.

[0064] In some embodiments, after the step of using the waste gas absorbent to absorb the electrolyte waste gas, the method further includes:

[0065] When the absorption rate of the waste gas absorbent for the electrolyte waste gas decreases, adding alkaline solution to the waste gas absorbent for activation;

[0066] The activated waste gas treatment agent is used to absorb the electrolyte waste gas again.

[0067] Using alkaline liquid for activation can make the waste gas treatment agent reused, thus reducing treatment costs.

[0068] In the present invention, based on the components of the gas to be treated, if the absorption efficiency of any component drops below 85%, alkaline solution is added for activation, thereby ensuring that all the substances to be treated are treated.

[0069] The technical solutions of the present invention are further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0070] Examples 1 to 4

[0071] Examples 1 to 4 respectively provide a waste gas treatment agent, and the specific components and contents of the raw materials of the waste gas treatment agent are shown in Table 1.

[0072] Table 1 Components and contents of waste gas treatment agents of Examples 1 to 4

[0073]

[0074]

[0075] Examples 1 to 4 also provide a method for preparing the above-mentioned waste gas treatment agent:

[0076] Mix the amine compound and water as shown in Table 1 to obtain an amine compound solution;

[0077] Polyethylene glycol dimethyl ether and water were mixed as shown in Table 1 to obtain an alcohol ether compound solution;

[0078] The amine compound solution and the alcohol ether compound solution are mixed, and the pH value is adjusted with KOH to obtain a waste gas treating agent.

[0079] Examples 5 to 9

[0080] Examples 5 to 9 respectively provide an exhaust gas treatment agent, the components and weight parts of which are shown in Table 2.

[0081] Table 2 Components and weight percentages of waste gas treatment agents in Examples 5 to 9

[0082]

[0083]

[0084] Examples 5 to 9 also provide methods for preparing the above-mentioned waste gas treatment agent:

[0085] As shown in Table 2, the amine compound, polyethylene glycol dimethyl ether and water were mixed to obtain a waste gas treatment agent.

[0086] Comparative Example 1

[0087] This comparative example provides an exhaust gas treating agent, the raw materials of which include 50 parts by weight of water and 50 parts by weight of N-methyldiethanolamine.

[0088] Comparative Example 2

[0089] This comparative example provides a waste gas treatment agent, wherein the treated alkali solution is industrial sodium hydroxide, and the pH value of the alkali absorption liquid is 12.

[0090] Test Examples

[0091] 1. Test the treatment efficiency of the waste gas treatment agents shown in Examples 1 to 7 on trimethylfluorosilane gas.

[0092] Test method: Provide a concentration of approximately 300 mg / m 3 Trimethylfluorosilane, total flow rate 2-3L, test the trimethylfluorosilane ratio of the inlet and outlet gases, test the concentration of the inlet and outlet gases, calculate the absorption rate, and the results are shown in Table 3.

[0093] The treatment method in the test is: trimethylfluorosilane gas flow rate 1.76L / min, temperature and pressure are normal temperature and pressure (25°C, 101.3KPa), absorption liquid is 200ml, and bubbling absorption is performed using a Monte Carlo washing bottle.

[0094] Table 3 Test results of Examples 5 to 7

[0095] Absorption rate (%) Example 1 91.3 Example 2 89 Example 3 92.7 Example 4 90.1 Example 5 63 Example 6 58 Example 7 71

[0096] 2. The absorption rates of Examples 1 to 4, Examples 8 to 9 and Comparative Example 1 for dimethyl carbonate were tested.

[0097] Test method: Provide a concentration of approximately 350-400 mg / m 3 The dimethyl carbonate content of the inlet and outlet gases was tested, the concentration of the inlet and outlet gases was tested, and the absorption rate was calculated. The results are shown in Table 4.

[0098] The treatment method used in the test was: dimethyl carbonate gas flow rate of 1.76 L / min, temperature and pressure of normal temperature and pressure (25°C, 101.3 kPa), and 200 ml of absorption liquid, using a Monte Carlo bubbling absorption bottle.

[0099] Table 4 Test results of some embodiments and comparative example 1

[0100]

[0101]

[0102] 3. The absorption rate of the mixed gas in Examples 1 to 4 was tested using the following method:

[0103] A mixed gas of trimethylfluorosilane, dimethyl carbonate and ethyl methyl carbonate is provided and absorbed by the waste gas treatment agent of Examples 1 to 4. The total flow rate of the mixed gas is 2-3 L. The content of trimethylfluorosilane in the mixed gas is 350 mg / m 3 Taking this as the standard, three mixed gases of trimethylfluorosilane, dimethyl carbonate and ethyl methyl carbonate with different percentages were prepared. The specific contents are shown in Table 5. The average absorption rate of the three gases in the three different mixed gases treated by each exhaust gas treatment agent was calculated, and the results are shown in Table 6.

[0104] The treatment method is as follows: a multi-channel gas distribution method is used, with a gas flow rate of 1.76 L / min for each branch, and the temperature and pressure are normal temperature and pressure (25°C, 101.3 kPa). The absorption liquid is 200 ml, and a Monte Carlo bubbling absorption is used.

[0105] Table 5 Mixed gas content

[0106]

[0107] Table 6 Average absorptivity of Examples 1 to 4

[0108]

[0109] 4. Repeat experiment 3) until the post-wash rate of trimethylfluorosilane drops to 85%. Then add alkali solution to restore the pH. Repeat operation 3) and test the average absorption rate again. The results are shown in Table 7.

[0110] Table 7 Average absorptivity of Examples 1 to 4

[0111]

[0112]

[0113] Compared to the comparative example, the waste gas treatment agents of Examples 1 to 9 employ both polyethylene glycol dimethyl ether and an amine compound, increasing the treatment rate for dimethyl carbonate to over 45%. When the amine compounds are N-methyldiethanolamine, tetramethylammonium hydroxide, and methoxypolyethylene glycolamine, and the pH of the reagent is maintained at an alkaline level, the absorption rate for trimethylfluorosilane alone increases to over 90%, and the absorption rate for dimethyl carbonate alone increases to over 94%. Each component of the mixed gas exhibits an absorption efficiency of over 85%. Furthermore, after reaching absorption saturation, the absorption rates of the aforementioned components, by restoring the pH, remain nearly consistent with the waste gas absorption rates before absorption saturation.

[0114] 5. The waste gas treatment agents of Example 1 and Comparative Example 2 were used to treat the electrolyte waste gas of a certain enterprise. The gas phase analysis results of the electrolyte waste gas are shown in Table 8 and Figure 1 As shown, the processing method is:

[0115] Exhaust gas volume is about 36400m 3 / h, the total non-methane hydrocarbon concentration in the exhaust gas is about 680mg / m 3 , at normal temperature and pressure (25℃, 101.3KPa), after two-stage alkaline washing, two-stage absorption is carried out using the corresponding waste gas treatment agent.

[0116] Among them, the gas phase analysis of the electrolyte waste gas treated with the waste gas treatment agent in Example 1 is shown in Table 9 and Figure 2 As shown in Table 10 and Table 11, the gas phase analysis of the electrolyte waste gas treated with the waste gas treatment agent of Comparative Example 2 is shown in Table 10 and Table 11. Figure 3 shown.

[0117] Table 8 Gas composition analysis results of a certain enterprise

[0118]

[0119]

[0120] Table 9 Gas phase analysis results of electrolyte waste gas treated with the waste gas treatment agent of Example 1

[0121] time CAS number area name percentage% 7.61 1126-58-5 16132674 N-Chloro-N-pyridyl acetohydrazide 0.73 7.90 616-38-6 13575951 Dimethyl carbonate 0.62 8.54 64-19-7 26903672 glacial acetic acid 1.23 8.73 10420-90-3 13880687 3,5-Hexadiene-1-yne 0.63 9.05 10420-90-3 13223101 3,5-Hexadiene-1-yne 0.60 11.30 544-25-2 1354730496 Cycloheptatriene 61.72 14.13 2175-91-9 51982944 6,6-Dimethyl-5-methylene-1,3-cyclopentadiene 2.37 15.11 2175-91-9 24797266 6,6-Dimethyl-5-methylene-1,3-cyclopentadiene 1.13 17.08 17634-51-4 18471154 7-Ethyl-1,3,5-cycloheptatriene 0.84 17.31 17634-51-4 15929401 7-Ethyl-1,3,5-cycloheptatriene 0.73 17.89 17634-51-4 22400564 7-Ethyl-1,3,5-cycloheptatriene 1.02 18.33 620-14-4 104526176 3-Ethyltoluene 4.76 19.54 620-14-4 99720816 3-Ethyltoluene 4.54 20.03 17634-51-4 12269569 7-Ethyl-1,3,5-cycloheptatriene 0.56 20.18 1120-21-4 141880384 n-Undecane 6.46 21.13 18368-95-1 18468662 p-Menthyl-1,3,8-triene 0.84 21.34 18368-95-1 20726120 p-Menthyl-1,3,8-triene 0.94 21.93 2722-36-3 15723883 3-Phenylbutanol 0.72 22.29 18368-95-1 19267808 p-Menthyl-1,3,8-triene 0.88 22.56 18368-95-1 21317740 p-Menthyl-1,3,8-triene 0.97 22.74 95-93-2 70901592 1,2,4,5-Tetramethylbenzene 3.23 23.19 3333-13-9 25965952 4-Allyltoluene 1.18 24.15 99-87-6 18177868 4-Isopropyltoluene 0.83 24.42 18202-24-9 42192892 10,13-octadecadienyl methyl ester 1.92 26.76 57156-91-9 11830094 2,5-octadecanediynoic acid methyl ester 0.54

[0122] Table 10 Gas phase analysis results of electrolyte waste gas treated with waste gas treatment agent of Comparative Example 2

[0123]

[0124] It can be seen from the above table that compared with the multi-stage treatment using only alkali solution, the waste gas treated with the waste gas treatment agent of the present invention can successfully remove fluorosilane and siloxane components.

[0125] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of the present invention.

Claims

1. A waste gas treatment agent, characterized in that: The raw materials of the waste gas treatment agent include the following components in parts by weight: N-methyldiethanolamine: 20 to 30 parts; Tetramethylammonium hydroxide: 10 to 15 parts; Methoxypolyethylene glycol amine: 3 to 8 parts; Polyethylene glycol dimethyl ether: 30 to 40 parts; and Water: 20 to 35 parts; The pH of the waste gas treatment agent is 8-10.

2. A method for preparing the waste gas treatment agent according to claim 1, characterized in that: The preparation method of the waste gas treatment agent comprises the following steps: The amine compound and the alcohol ether compound are mixed to obtain the exhaust gas treating agent.

3. A method for treating electrolyte waste gas, characterized in that: The waste gas treatment agent according to any one of claims 1 to 2 is used to absorb electrolyte waste gas.

4. The electrolyte waste gas treatment method according to claim 3, characterized in that: The treatment temperature when using the waste gas treatment agent to treat the absorbed electrolyte waste gas is 20 to 50°C.

5. The electrolyte waste gas treatment method according to claim 3, characterized in that: After the step of using the waste gas treatment agent to absorb the electrolyte waste gas, the method further includes: When the absorption rate of the waste gas treatment agent for the electrolyte waste gas decreases, adding alkaline solution to the waste gas treatment agent for activation; The activated waste gas treatment agent is used to absorb the electrolyte waste gas again.

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