A high-absorption VOCs absorbent and a preparation method thereof

Abstract

The application relates to the field of contaminated gas treatment, and particularly discloses a high-absorption VOCs absorbent and a preparation method thereof. The high-absorption VOCs absorbent comprises the following components in parts by weight: a solubilizing composition 20-30%; a cosurfactant 10-15%; solvent oil 40-50%; and water in the remainder. The solubilizing composition comprises component A, wherein the component A comprises polyoxyethylene nonionic surfactant and paeonol, and the weight ratio of the polyoxyethylene nonionic surfactant to the paeonol is 1: (0.1-0.2). The high-absorption VOCs absorbent and the preparation method thereof comprise the following steps: S1, uniformly mixing the solubilizing composition and the cosurfactant, adding water, and dropwise adding solvent oil to obtain the high-absorption VOCs absorbent. The high-absorption VOCs absorbent can be used for industrial absorption of solvents in waste gas, has the advantages of high absorption rate and an absorption amount of 141.5-145.7 mg / g after 50 hours of ventilation, and the preparation method has the advantages of few steps, simplicity and high efficiency.

Description

Technical Field

[0001] This application relates to the field of pollutant gas treatment, and more specifically, to a high-absorption-capacity VOCs absorbent and its preparation method. Background Technology

[0002] Hazardous waste gases not only severely impact the environment and ecology but also pose a significant threat to human health, causing central nervous system disorders, lesions, and leading to both chronic and acute illnesses. Currently, the treatment of odorous waste gases generally employs physical, chemical, and biological methods to alter the structural composition of the substances within the gases, thereby eliminating odor. Common treatment methods include combustion, oxidation, adsorption, neutralization, and biological processes.

[0003] The adsorption method requires the use of an absorbent. The principle of conventional absorbents is based on the gas composition, using acids, alkalis, or strong oxidants as washing spray solutions. These solutions come into gas-liquid contact with the waste gas molecules in the gas phase, causing the waste gas molecules in the gas phase to transfer to the liquid phase. The waste gas molecules are then removed by reacting with chemical agents.

[0004] Waste gas contains a large number of soluble and insoluble pollutants. While conventional absorbents have good treatment effects, they are limited to treating soluble pollutants. When waste gas contains volatile organic compounds (VOCs), since most VOCs are insoluble pollutants, the treatment of this type of waste gas suffers from low or no absorption capacity.

[0005] Currently, there is a biodiesel-based absorbent that includes biodiesel, water, surfactant, and co-surfactant. It uses biodiesel to absorb toluene based on the principle of "like dissolves like". The absorbent has an absorption capacity of 127.2 mg / g for toluene, and there is room for further improvement in the absorption capacity. Summary of the Invention

[0006] To improve the absorption capacity of absorbents for VOCs, this application provides a high-absorption-capacity VOCs absorbent and its preparation method.

[0007] In a first aspect, this application provides a high-absorption-capacity VOCs absorbent, employing the following technical solution:

[0008] A high-absorption-capacity VOCs absorbent comprises the following components in parts by weight:

[0009] 20-30% of the solubilizing composition;

[0010] 10-15% co-surfactant;

[0011] Solvent oil 40-50%;

[0012] Water balance;

[0013] The solubilizing composition includes component A, which comprises a polyoxyethylene nonionic surfactant and paeonol, wherein the weight ratio of the polyoxyethylene nonionic surfactant to paeonol is 1:(0.1-0.2).

[0014] By adopting the above technical solution: taking toluene in waste gas as an example, through absorption detection,

[0015] The absorbent prepared in this application absorbs N of toluene after 30 hours. 30 The concentration was 110.4-117.8 mg / g, without the addition of paeonol (N). 30 The concentration was 97.6 mg / g, indicating that the addition of paeonol improved the absorption efficiency.

[0016] The absorption capacity (N) of toluene by an absorbent containing paeonol after 50 hours. 50 The concentration was 141.5-145.7 mg / g, and no absorbent agent, paeonol, was added. 50 The concentration was only 120.7 mg / g, indicating that paeonol significantly increased the absorption of toluene by the absorbent. The reason for this may be:

[0017] Surfactants can reduce the surface tension between gas and liquid and form micelles. Toluene can be solubilized in the micelle core, palisade layer, and micelle surface, thus increasing the solubility of toluene and the absorption capacity of the absorbent. The palisade layer has the highest solubilization capacity. Therefore, this application uses a polyoxyethylene nonionic surfactant (hereinafter referred to as surfactant) and paeonol. The polyoxyethylene nonionic surfactant and the water molecules associated with it cause the palisade layer and micelle shell to occupy most of the micelle area. During the micelle formation process, after paeonol dissolves, it embeds and fills the micelle core, supporting and expanding the diameter of the micelle core to form a large-diameter micelle. Therefore, the area of ​​the palisade layer and micelle shell increases, thereby increasing the absorption capacity of toluene.

[0018] Optionally, the polyoxyethylene nonionic surfactant is one or more of Tween-80, Tween-60, Tween-40, and Tween-20.

[0019] By adopting the above technical solution: the Tween series are polyoxyethylene nonionic surfactants, all of which can be used in this application. Among them, the chain length of Tween-80, Tween-60, Tween-40 and Tween-20 gradually decreases, with Tween-80 having the best performance.

[0020] Optionally, the raw materials also include component B, which includes fluorocarbon surfactants, hydrocarbon surfactants, and tributyl phosphate; the component B accounts for 20%-30% of the total mass of the solubilizing composition.

[0021] By adopting the above technical solutions, hydrocarbon surfactants have a better effect on reducing the surface tension of water systems, especially the ability to gradually reduce the surface tension over time, which can increase the solubility of toluene over time. The combination of fluorocarbons and tributyl phosphate with hydrocarbon surfactants can significantly enhance the surface tension reduction effect of component B, improve the solubilization ability of toluene, and further increase the absorption of toluene.

[0022] Testing revealed that when component B was not added (i.e., the absorbent consisted entirely of component A), the nitrogen content of the prepared absorbent was [missing information]. 30 119.6 mg / g, N 50 The N2 content of the absorbent is 148.8 mg / g. However, when an equal amount of component B is used to replace part of component A (i.e., the absorbent is a mixture of components A and B), the N2 content of the resulting absorbent is... 30 Reaching 121.6 mg / g or higher, N 50 Reaching 155.6 mg / g or higher indicates that the combination of component A and component B is more effective than using component A alone, and there is a certain synergistic effect between the two, which together improve the absorption of toluene by the absorbent, especially in the middle and late stages.

[0023] Optionally, the weight ratio of the fluorocarbon surfactant to the hydrocarbon surfactant is (0.05-0.10):1.

[0024] By adopting the above technical solution, when the amounts of fluorocarbon surfactants and hydrocarbon surfactants are within the above-mentioned range, the resulting absorbent exhibits a higher absorption capacity for toluene due to its superior compounding effect. When the weight ratio is 0.75:1, the N... 50 It reached its maximum, at 158.5 mg / g.

[0025] Optionally, the fluorocarbon surfactant is one or more of ZONYL FSO, ZONYL FSN, and ZONYL FS 300, or a mixture thereof.

[0026] Optionally, the hydrocarbon surfactant is one or a mixture of TRITON X-100, Aerosol OT, WITCONATE P-1059, SURFADONE LP-100, SURFYNOL 104, DYNOL 604, MERPOL SE, and MERPOL SH.

[0027] Optionally, the co-surfactant is one or a mixture of ethanol, n-butanol, n-pentanol, and n-octanol.

[0028] By adopting the above technical solution, ethanol, n-butanol, n-pentanol, and n-octanol can be used as co-surfactants to help the surfactant reduce interfacial tension and increase interfacial fluidity, so that the surfactant has a greater adsorption effect at the oil-water interface; among them, when n-butanol is used, the absorbent absorbs the most toluene.

[0029] Optionally, the solvent oil is a mixture of epoxidized soybean oil and dimethyl silicone oil in a weight ratio of (2-3):1.

[0030] Secondly, this application provides a method for preparing a high-absorption-capacity VOCs absorbent, employing the following technical solution:

[0031] A method for preparing a high-absorption-capacity VOCs absorbent includes the following steps:

[0032] S1. Mix the solubilizing composition and the co-surfactant, add water, and mix to obtain mixture A;

[0033] S2. Add solvent oil to mixture A to obtain a high-absorption-capacity VOCs absorbent.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. The solubilizing composition used in this application contains polyoxyethylene nonionic surfactant and paeonol. During the formation of micelles by the polyoxyethylene nonionic surfactant, paeonol enters and supports the micelle core, thereby promoting the formation of a larger diameter micelle core, which significantly increases the area of ​​the micelle fence layer and shell, thereby improving the solubilizing ability of toluene and increasing the absorption of toluene by the absorbent.

[0036] 2. The solubilizing composition of this application also contains fluorocarbon surfactants, hydrocarbon surfactants and tributyl phosphate. Due to the surface activity of fluorocarbons and the effect of tributyl phosphate in increasing the surface tension of hydrocarbon surfactants, the solubility of toluene is improved and the absorption of toluene by the absorbent is increased.

[0037] 3. The method of this application is simple and efficient, which is conducive to the large-scale preparation of absorbents. Moreover, the absorbent prepared not only has a high absorption rate for toluene, but also a large amount, which is convenient for industrial removal of toluene from waste gas. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments.

[0039] Preparation Example 1

[0040] A solubilizing composition comprising component A, which is obtained by conventionally mixing 1 kg of a polyoxyethylene nonionic surfactant (Tween-60) and 0.1 kg of paeonol.

[0041] Preparation Example 2

[0042] A solubilizing composition comprising component A, which is obtained by conventionally mixing 1 kg of a polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol.

[0043] Preparation Example 3

[0044] A solubilizing composition comprising component A, which is obtained by conventionally mixing 1 kg of a polyoxyethylene nonionic surfactant (a mixture of Tween-40 and Tween-20 in a weight ratio of 1:1) and 0.2 kg of paeonol.

[0045] Preparation Example 4

[0046] A solubilizing composition comprising, by weight percentage, 80 wt% component A and 20 wt% component B, obtained by conventional mixing; wherein:

[0047] Component A is obtained by conventional mixing of 1 kg of polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol;

[0048] Component B is obtained by conventionally mixing 0.05 kg of fluorocarbon surfactant (ZONYL FSO), 1 kg of hydrocarbon surfactant (TRITONX-100), and 0.05 kg of tributyl phosphate.

[0049] ZONYL FSO originated from DuPont, USA;

[0050] TRITON X-100 is sourced from Dow Chemical Company in the United States.

[0051] Preparation Example 5

[0052] A solubilizing composition comprising, by weight percentage, 75 wt% component A and 25 wt% component B, obtained by conventional mixing; wherein:

[0053] Component A is obtained by conventional mixing of 1 kg of polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol;

[0054] Component B is obtained by conventionally mixing 0.05 kg of fluorocarbon surfactant (ZONYL FSN), 1 kg of hydrocarbon surfactant (Aerosol OT), and 0.05 kg of tributyl phosphate.

[0055] ZONYL FSN originated from DuPont, USA;

[0056] Aerosol OT originates from Cytec.

[0057] Preparation Example 6

[0058] A solubilizing composition comprising, by weight percentage, 70 wt% component A and 30 wt% component B, obtained by conventional mixing; wherein:

[0059] Component A is obtained by conventional mixing of 1 kg of polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol;

[0060] Component B is prepared by conventional mixing of 0.05 kg of fluorocarbon surfactant (a mixture of ZONYL FSN and ZONYL FS 300 in a 1:1 weight ratio), 1 kg of hydrocarbon surfactant (a mixture of WITCONATE P-1059 and SURFADONE LP-100 in a 1:1 weight ratio) and 0.05 kg of tributyl phosphate.

[0061] ZONYL FS 300 is sourced from DuPont, USA;

[0062] WITCONATE P-1059 is sourced from AkzoNobel; SURFADONE LP-100 is sourced from Ashland Group in the United States.

[0063] Preparation Example 7

[0064] A solubilizing composition comprising, by weight percentage, 75 wt% component A and 25 wt% component B, obtained by conventional mixing; wherein:

[0065] Component A is obtained by conventional mixing of 1 kg of polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol;

[0066] Component B is obtained by conventionally mixing 0.075 kg of fluorocarbon surfactant (ZONYL FSN), 1 kg of hydrocarbon surfactant (Aerosol OT), and 0.05 kg of tributyl phosphate.

[0067] Preparation Example 8

[0068] A solubilizing composition comprising, by weight percentage, 75 wt% component A and 25 wt% component B, obtained by conventional mixing; wherein:

[0069] Component A is obtained by conventional mixing of 1 kg of polyoxyethylene nonionic surfactant (Tween-80) and 0.15 kg of paeonol;

[0070] Component B is obtained by conventionally mixing 0.1 kg of fluorocarbon surfactant (ZONYL FSN), 1 kg of hydrocarbon surfactant (AerosolOT), and 0.05 kg of tributyl phosphate.

[0071] Example 1

[0072] A high-absorption-capacity VOCs absorbent, the components and their corresponding weights are shown in Table 1, and is prepared by the following steps: S1, the solubilizing composition (prepared by Preparation Example 1) and the co-surfactant (ethanol) are mixed, water is added, and the mixture is mixed to obtain mixture A;

[0073] S2. Add solvent oil (a mixture of epoxidized soybean oil and dimethyl silicone oil in a weight ratio of 2:1) to mixture A to obtain a high-absorption-capacity VOCs absorbent.

[0074] Ethanol, 75% concentration;

[0075] The epoxidized soybean oil is sourced from Jinan Hongtai Chemical Co., Ltd., model number 23060601;

[0076] The dimethyl silicone oil is sourced from Jinan Hongtai Chemical Co., Ltd., model number 02301000237.

[0077] Example 2

[0078] A high-absorption-capacity VOCs absorbent, the components and their corresponding weights are shown in Table 1, and is prepared by the following steps: S1, the solubilizing composition (prepared by Preparation Example 1) and the co-surfactant (n-butanol) are mixed, water is added, and the mixture is mixed to obtain mixture A;

[0079] S2. Add solvent oil (a mixture of epoxidized soybean oil and dimethyl silicone oil in a weight ratio of 2.5:1) to mixture A to obtain a high-absorption-capacity VOCs absorbent.

[0080] Example 3

[0081] A high-absorption-capacity VOCs absorbent, the components and their corresponding weights are shown in Table 1, and it is prepared by the following steps:

[0082] S1. Mix the solubilizing composition (prepared from Preparation Example 1) and the co-surfactant (a mixture of n-pentanol and n-octanol in a weight ratio of 1:1), add water, and mix to obtain mixture A;

[0083] S2. Add solvent oil (a mixture of epoxidized soybean oil and dimethyl silicone oil in a weight ratio of 3:1) to mixture A to obtain a high-absorption-capacity VOCs absorbent.

[0084] Comparative Example 1

[0085] A high-absorption-capacity VOCs absorbent differs from Example 2 in that an equal amount of polyoxyethylene nonionic surfactant (Tween-80) is used instead of the solubilizing composition.

[0086] Comparative Examples 2-3

[0087] A high-absorption-capacity VOCs absorbent differs from Example 2 in that the components and their corresponding weights are shown in Table 1.

[0088] Table 1. Components and their weights (kg) in Examples 1-3 and Comparative Examples 2-3.

[0089]

[0090] Examples 4-10

[0091] A high-absorption-capacity VOCs absorbent differs from Example 2 in that the use of the solubilizing composition is as shown in the table below, but the amount of the solubilizing composition used in the absorbent remains unchanged.

[0092] Table 2. Usage of the solubilizing compositions in Examples 4-10

[0093] Example 4 5 6 7 8 9 10 Preparation example of solubilizing composition 2 3 4 5 6 7 8

[0094] Absorption detection

[0095] The absorption capacity of the high-absorption-capacity VOCs absorbents prepared in the examples and comparative examples was tested, and the test results are recorded in Table 3.

[0096] Detection methods

[0097] 300g of each absorbent was injected into three absorption bottles at a dosage of 100g per bottle. Gas containing 33500mg / g of toluene was introduced into each bottle at a flow rate of 100mL / min and a temperature of 25℃. Samples were taken from each of the three absorption bottles after 30h, 40h, and 50h of gas introduction. The analysis was performed using an Agilent 6820GC gas chromatograph with a flame ionization detector (FID). Toluene was sampled and analyzed online at the inlet and outlet of the absorption bottles using a six-way valve. To ensure data accuracy, each sample was analyzed three times, and the average value was calculated. The amount of toluene absorbed by the absorbent was used as the characterization index, and the absorption amount after 30h was denoted as N. 30 The amount absorbed in 40 hours is denoted as N. 40 The amount absorbed in 50 hours is denoted as N. 50 The absorption amount N is calculated according to the following formula:

[0098] N = Toluene concentration at the inlet - Toluene concentration at the outlet.

[0099] Table 3 Performance test results

[0100] project <![CDATA[N 30 (mg / g)]]> <![CDATA[N 40 (mg / g)]]> <![CDATA[N 50 (mg / g)]]> Example 1 110.4 133.9 141.5 Example 2 117.8 140.6 145.7 Example 3 115.3 138.9 143.3 Example 4 119.6 142.8 148.8 Example 5 118.7 141.3 147.5 Example 6 121.6 146.4 155.6 Example 7 123.4 149.5 157.6 Example 8 122.3 148.7 156.4 Example 9 125.2 150.6 159.3 Example 10 124.8 149.9 158.5 Comparative Example 1 88.0 103.5 120.7 Comparative Example 2 92.1 115.4 125.6 Comparative Example 3 97.6 120.2 129.9

[0101] Referring to Table 1, the absorbents prepared using the solubilizing compositions obtained in Preparation Example 1 in Examples 1-3 showed an absorption capacity (N) of N over 50 hours. 50The concentration was 141.5-145.7 mg / g, indicating a high absorption capacity for toluene; while in Comparative Example 1, an equal amount of surfactant was used instead of the solubilizing composition, resulting in N... 50 The concentration was 120.7 mg / g, indicating a significant decrease in toluene absorption. The possible reasons for this are:

[0102] During the formation of surfactant micelles, paeonol is inserted into the micelle core as a molecule, supporting and promoting the formation of a larger diameter core. The area of ​​the outer palisade layer and micelle shell increases, thereby improving the solubilization effect of micelles on toluene and increasing the absorption of toluene by the absorbent.

[0103] The difference between Comparative Examples 2-3 and Example 2 lies in the different amounts of each component in the absorbent. As shown in Table 1, when the amounts of each component are within the range of Examples 1-3, the absorbent absorbs more toluene. When the amounts are outside the range of Examples 1-3, the absorbent absorbs less toluene.

[0104] The difference between Examples 4-5 and Example 2 lies in the amount of paeonol used in the solubilizing composition. When the weight ratio of paeonol to polyoxyethylene nonionic surfactant is 0.15:1, the absorption amount N of the absorbent is [not specified]. 50 The maximum was 148.8 mg / g.

[0105] The difference between Examples 6-8 and Example 4 is that in the solubilizing composition, a portion of component B, composed of fluorocarbon surfactants, hydrocarbon surfactants, and tributyl phosphate, is used instead of an equal amount of component A, resulting in an absorbent with higher N2 content. 50 The increase from 148.8 mg / g before substitution to over 155.6 mg / g indicates that component B works synergistically with component A to jointly improve the absorption of toluene (especially in the later stages of absorption).

[0106] The difference between Examples 9-10 and Example 7 is that the amount of fluorocarbon surfactant in the solubilizing composition is increased. When the amount is the same as in Example 9, the absorption of toluene by the prepared absorbent is increased. However, when the amount is further increased to that in Example 10, the absorption decreases.

[0107] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-absorption-capacity VOCs absorbent, characterized in that, The components include the following parts by weight: 20-30% of the solubilizing composition; 10-15% co-surfactant; Solvent oil 40-50%; Water balance; The solubilizing composition includes component A, which includes a polyoxyethylene nonionic surfactant and paeonol, wherein the weight ratio of the polyoxyethylene nonionic surfactant to paeonol is 1:(0.1-0.2).

2. The high-absorption-capacity VOCs absorbent according to claim 1, characterized in that: The polyoxyethylene nonionic surfactant is a mixture of one or more of Tween-80, Tween-60, Tween-40, and Tween-20.

3. The high-absorption-capacity VOCs absorbent according to claim 1, characterized in that: The raw materials also include component B, which includes fluorocarbon surfactants, hydrocarbon surfactants, and tributyl phosphate; Component B accounts for 20%-30% of the total mass of the solubilizing composition.

4. The high-absorption-capacity VOCs absorbent according to claim 3, characterized in that: The weight ratio of the fluorocarbon surfactant to the hydrocarbon surfactant is (0.05-0.10):

1.

5. A high-absorption-capacity VOCs absorbent according to claim 3, characterized in that: The fluorocarbon surfactant is a mixture of one or more of ZONYL FSO, ZONYL FSN, and ZONYL FS 300.

6. A high-absorption-capacity VOCs absorbent according to claim 3, characterized in that: The hydrocarbon surfactant is one or more of the following: TRITON X-100, Aerosol OT, WITCONATE P-1059, SURFADONE LP-100, SURFYNOL 104, DYNOL 604, MERPOL SE, and MERPOL SH.

7. The high-absorption-capacity VOCs absorbent according to claim 1, characterized in that: The co-surfactant is one or more of ethanol, n-butanol, n-pentanol, and n-octanol, forming a mixture.

8. The high-absorption-capacity VOCs absorbent according to claim 1, characterized in that: The solvent oil is a mixture of epoxidized soybean oil and dimethyl silicone oil in a weight ratio of (2-3):

1.

9. A method for preparing a high-absorption-capacity VOCs absorbent according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Mix the solubilizing composition and the co-surfactant, add water, and mix to obtain mixture A; S2. Add solvent oil to mixture A to obtain a high-absorption-capacity VOCs absorbent.

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