Olefin VOCs absorbent, preparation method and application thereof, and method for removing olefin VOCs in waste gas

Abstract

The invention relates to the field of olefin VOCs (volatile organic compounds) absorption treatment, and discloses an olefin VOCs absorbent as well as a preparation method and application thereof, and a method for removing olefin VOCs in waste gas. The absorbent contains a hydrogen bond acceptor, a hydrogen bond donor and a composite component in a molar ratio of 1: (1-8): (0.01-0.2), the hydrogen bond acceptor and / or the hydrogen bond donor contain / contains a double-bond structure; the hydrogen bond donor is provided by fatty acid with a molecular formula of R-COOH; the composite component is a combination of a component A and a component B; the component A is at least one of dipentene and terpinene; the component B is at least one of ethyl benzoate and isophorone; the hydrogen bond receptor is selected from menthol and quaternary ammonium bromide. The absorbent provided by the invention has the advantages of low saturated vapor pressure and low volatility, has large absorption capacity on olefin VOCs, and is cheap and green in synthetic raw materials and simple in preparation process.

Description

Technical Field

[0001] The present invention relates to the field of absorption treatment of olefinic volatile organic compounds, and particularly relates to an absorbent for olefinic VOCs, a preparation method and application thereof, and a method for removing olefinic VOCs from waste gas. Background Art

[0002] The treatment of volatile organic compounds (VOCs) has become an important part of environmental protection and pollutant treatment; when VOCs are discharged into the atmospheric environment, on the one hand, they are important precursors for the formation of photochemical smog and PM2.5, and on the other hand, they pose a serious threat to life and health. Olefinic compounds are an important component of VOCs and are common components in the production waste gas of industries such as petrochemical, coal chemical, and organic solvents. Common olefinic VOCs include ethylene, propylene, butadiene, styrene, etc. With the increasingly strict VOCs emission standards, the in-depth treatment of VOCs has become a research hotspot in the current environmental protection field.

[0003] The treatment of VOCs is divided into destruction methods and recovery methods. The destruction method is mainly the thermal oxidation combustion method, that is, olefinic VOCs are oxidized and decomposed into small molecules of CO2 and H2O through high temperature and then discharged into the atmosphere. However, this method has high energy consumption, and incomplete oxidation reactions may produce other harmful gases. In addition, the generated CO2 will also increase carbon emissions. The recovery method mainly achieves the up-to-standard discharge of VOCs through a combination of various processes, such as condensation - adsorption, absorption - adsorption, condensation - membrane separation, etc. Among them, condensation mostly adopts secondary or above treatment, with high energy consumption and easy ice blockage; the treatment effect of membrane separation depends on the membrane material, and the stability and economy of current membrane materials still need to be improved; adsorption usually uses activated carbon as the adsorbent, and frequent carbon replacement will generate a large amount of hazardous waste, increasing the operating cost. Absorption realizes the recovery of VOCs through the dissolution of the absorbent in VOCs. This method has the advantages of mature process, stable operation, simple operation and maintenance, etc.

[0004] Since olefinic VOCs have extremely low solubility in water, gasoline, diesel, mineral oil, organic solvents, etc. are often used in industry. However, the above absorbents often have a high saturated vapor pressure and are relatively volatile themselves, so the in-depth recovery of olefinic VOCs cannot be achieved.

[0005] Therefore, the development of a hydrophobic absorbent with high absorption capacity for olefinic VOCs, high removal efficiency, and low volatility can significantly improve the recovery efficiency of olefinic VOCs by the absorption method, thereby achieving the in-depth treatment of olefinic VOCs. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems of high saturated vapor pressure, strong volatility, and poor removal efficiency of existing olefinic VOCs absorbents.

[0007] To achieve the above object, a first aspect of the present invention provides an olefinic VOC absorbent, which contains a hydrogen bond acceptor, a hydrogen bond donor, and a composite component in a molar ratio of 1:1 - 8:0.01 - 0.2;

[0008] The hydrogen bond donor is provided by a fatty acid with the molecular formula R-COOH, and R is selected from an alkyl group of C5-C 10 and an alkenyl group of C 16 -C 18 ;

[0009] The composite component is a combination of component A and component B; component A is at least one of dipentene and terpinene; component B is at least one of ethyl benzoate and isophorone;

[0010] The hydrogen bond acceptor is selected from at least one of menthol and quaternary ammonium bromide;

[0011] The saturated vapor pressure of the absorbent at 25 °C is less than 80 Pa, the saturated water content is less than 1 mol%, and the freezing point is less than 10 °C.

[0012] A second aspect of the present invention provides a preparation method of an olefinic VOC absorbent, which includes the following steps:

[0013] The hydrogen bond acceptor, the hydrogen bond donor, and the composite component are subjected to a first contact to obtain an olefinic VOC absorbent;

[0014] The molar ratio of the amounts of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component used is 1:1 - 8:0.01 - 0.2;

[0015] The definitions of the composite component, the hydrogen bond acceptor, and the hydrogen bond donor are the same as those defined in the first aspect.

[0016] A third aspect of the present invention provides an olefinic VOC absorbent prepared by the method described in the second aspect.

[0017] A fourth aspect of the present invention provides that the olefinic VOC absorbent described in the first aspect and / or the third aspect is used to absorb at least one olefinic volatile organic compound among ethylene, propylene, butadiene, and styrene.

[0018] A fifth aspect of the present invention provides a method for removing olefinic VOCs from waste gas, which includes: subjecting the waste gas to a second contact with the absorbent to obtain a mixture containing olefinic VOCs;

[0019] The absorbent is the olefinic VOC absorbent described in the first aspect and / or the third aspect.

[0020] The olefinic VOC absorbent provided by the present invention contains a hydrogen bond acceptor, a hydrogen bond donor, and a composite component in a specific ratio. This absorbent has the advantages of low saturated vapor pressure, being not easily volatile, having a large absorption capacity for olefin VOCs, and the synthetic raw materials of this absorbent are cheap, green, and the preparation process is simple. Detailed implementation manners

[0021] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0022] As described above, the first aspect of the present invention provides an olefinic VOC absorbent, which contains a hydrogen bond acceptor, a hydrogen bond donor, and a composite component in a molar ratio of 1:1 - 8:0.01 - 0.2;

[0023] The hydrogen bond donor is provided by a fatty acid with the molecular formula R-COOH, and R is selected from alkyl groups with C5 - C 10 and alkenyl groups with C 16 -C 18 ;

[0024] The composite component is a combination of component A and component B; component A is at least one of dipentene and terpinene; component B is at least one of ethyl benzoate and isophorone;

[0025] The hydrogen bond acceptor is selected from at least one of menthol and quaternary ammonium bromide;

[0026] The saturated vapor pressure of the absorbent at 25 °C is less than 80 Pa, the saturated water content is less than 1 mol%, and the freezing point is less than 10 °C.

[0027] In the present invention, the C5 - C 10 alkyl group represents an alkyl group with a total number of carbon atoms of 5 - 10, including straight-chain alkyl groups with C5 - C 10 and branched-chain alkyl groups with C5 - C 10 , such as n-pentyl, isopentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, etc.

[0028] In the present invention, the C 16 -C 18 alkenyl group represents a hydrocarbon group formed by removing one or several hydrogen atoms from an olefin molecule, and the total number of carbon atoms in this alkenyl group is 16 - 18, and the double bond in this group can be at any position. For example, it can be CH3(CH2)7CH=CH(CH2)6CH2-, CH3(CH2)13 CH=CH-, etc.

[0029] In the present invention, the saturated vapor pressure of the olefinic VOCs absorbent is determined by thermogravimetric analysis, and the saturated water content is determined by Karl Fischer titration. The saturated water content x w Calculation formula: x w = n w / (n w + S) × 100%, where n w is the amount of substance of water, and S is the total molar amount of the components of the olefinic VOCs absorbent.

[0030] Preferably, the hydrogen bond donor is provided by a fatty acid with the molecular formula R-COOH, and R is selected from at least one of CH3(CH2)3CH2-, CH3(CH2)7CH2-, CH3(CH2)7CH=CH(CH2)6CH2-.

[0031] Preferably, the quaternary ammonium bromide is tetraoctylammonium bromide. The inventors found that under this preferred condition, the obtained absorbent has a higher saturated absorption capacity for olefinic VOCs.

[0032] Preferably, in the composite component, the molar ratio of the content of component A to component B is 1:0.1 - 2. The inventors found that under this preferred condition, the obtained absorbent has a higher absorption capacity.

[0033] Preferably, the hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donor is selected from at least one of CH3(CH2)3CH2COOH, CH3(CH2)7CH=CH(CH2)6CH2COOH, CH3(CH2)7CH2COOH; and the molar ratio of the content of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3 - 8:0.05 - 0.2.

[0034] According to a preferred specific embodiment, the hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donor is CH3(CH2)3CH2COOH; and the molar ratio of the content of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3 - 5:0.05 - 0.1. The inventors found that under this preferred condition, the obtained absorbent has a better absorption effect on olefinic VOCs and a higher absorption capacity.

[0035] According to another preferred specific embodiment, the hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donors are CH3(CH2)7CH=CH(CH2)7COOH and CH3(CH2)7CH2COOH; and the molar ratio of the hydrogen bond acceptor, hydrogen bond donors, and the composite component is 1:6 - 8:0.05 - 0.2, and the molar ratio of CH3(CH2)7CH2COOH and CH3(CH2)7CH=CH(CH2)7COOH is 1:0.6 - 1.5. The inventors found that in this preferred case, the obtained absorbent has a better absorption effect on olefinic VOCs and a higher absorption capacity.

[0036] Preferably, the hydrogen bond acceptor is menthol, and the hydrogen bond donor is CH3(CH2)7CH2COOH; and the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and the composite component is 1:1 - 3:0.01 - 0.1. The inventors found that in this preferred case, the obtained absorbent has a greater absorption capacity for olefinic VOCs.

[0037] As described above, the second aspect of the present invention provides a method for preparing an absorbent for olefinic VOCs, which method comprises the following steps:

[0038] Bring the hydrogen bond acceptor, hydrogen bond donors, and the composite component into a first contact to obtain an absorbent for olefinic VOCs;

[0039] The molar ratio of the amounts used of the hydrogen bond acceptor, hydrogen bond donors, and the composite component is 1:1 - 8:0.01 - 0.2;

[0040] The definitions of the composite component, hydrogen bond acceptor, and hydrogen bond donors are the same as those defined in the first aspect.

[0041] The amounts and types of the various components involved in the second aspect of the present invention are the same as the contents and types of the corresponding components in the first aspect of the present invention, and will not be elaborated herein. Those skilled in the art should not consider this as a limitation of the present invention.

[0042] Preferably, the mode of the first contact is selected from at least one of ultrasonic oscillation and stirring.

[0043] Preferably, in the composite component, the molar ratio of component A to component B is 1:0.1 - 2.

[0044] According to a preferred specific embodiment, the first contact is carried out under stirring conditions, and the conditions of the first contact include: the temperature is 30 - 80°C, and the stirring time is 30 - 90 min. Preferably, the conditions of the first contact include: the temperature is 50 - 70°C, and the stirring time is 40 - 80 min.

[0045] It should be noted that the present invention does not particularly limit the rotation speed of the stirring, and those skilled in the art can select it according to needs. For example, the stirring rotation speed is 200 - 500 rpm.

[0046] According to another preferred specific embodiment, the first contact is carried out under the condition of ultrasonic oscillation, and the conditions of the first contact include: the time of ultrasonic oscillation is 20 - 80 min, and the temperature is 30 - 80 °C. More preferably, the conditions of the first contact include: the time of ultrasonic oscillation is 40 - 70 min, and the temperature is 50 - 70 °C. The present invention does not particularly require the frequency of the ultrasonic oscillation, and those skilled in the art can select it according to needs.

[0047] As mentioned above, the third aspect of the present invention provides an olefinic VOCs absorbent prepared by the method described in the second aspect.

[0048] As mentioned above, the fourth aspect of the present invention provides that the olefinic VOCs absorbent described in the first aspect and / or the third aspect is used to absorb at least one olefinic volatile organic compound among ethylene, propylene, butadiene, and styrene.

[0049] Preferably, the absorption capacity of the absorbent for olefinic VOCs at 25 °C > 100 g / kg.

[0050] As mentioned above, the fifth aspect of the present invention provides a method for removing olefinic VOCs from waste gas, which includes: making the waste gas contact with the absorbent for a second time to obtain a mixture containing olefinic VOCs;

[0051] The absorbent is the olefinic VOCs absorbent described in the first aspect or the third aspect.

[0052] Preferably, the feed volume ratio of the waste gas to the olefinic VOCs is 2 - 30:1. More preferably, the feed volume ratio of the waste gas to the olefinic VOCs is 2 - 10:1. The inventors found that under this preferred condition, the olefinic VOCs absorbent and the waste gas can contact better, improving the removal rate of olefinic VOCs.

[0053] Preferably, the waste gas contains 0.01 - 20 vol% of olefinic VOCs.

[0054] Preferably, the conditions of the second contact include: the temperature is 10 - 40 °C, the pressure is 0.1 - 0.5 MPa, and the time is 0.2 - 2 min.

[0055] The present invention will be described in detail below through examples. In the following examples, the instruments, reagents, materials, etc. involved, unless otherwise specified, are all conventional instruments, reagents, materials, etc. existing in the prior art and can be obtained through regular commercial channels.

[0056] In the following examples, the saturated water content x of the olefinic VOC absorbent w is calculated as follows:

[0057] x w = n w / (n w + S) × 100%

[0058] where n w is the amount of substance of water, and S is the total molar amount of the components of the olefinic VOC absorbent.

[0059] Example 1

[0060] The formulation of this example is shown in Table 1 below:

[0061] Table 1

[0062]

[0063] Method for preparing the olefinic VOC absorbent:

[0064] Contact the hydrogen bond donor, hydrogen bond acceptor, and composite component at 300 rpm and 70 °C for 80 min to obtain the olefinic VOC absorbent.

[0065] Example 2

[0066] The formulation of this example is shown in Table 2 below:

[0067] Table 2

[0068]

[0069] Method for preparing the olefinic VOC absorbent:

[0070] Ultrasonically oscillate the hydrogen bond acceptor, hydrogen bond donor, and composite component at 60 °C for 60 min to obtain the olefinic VOC absorbent.

[0071] Example 3

[0072] The formulation of this example is shown in Table 3 below:

[0073] Table 3

[0074]

[0075] Method for preparing the olefinic VOC absorbent:

[0076] Stir the hydrogen bond donor, hydrogen bond acceptor, and composite component at 300 rpm and 60 °C for 70 min to obtain the olefinic VOC absorbent.

[0077] Example 4

[0078] In this example, an olefinic VOC absorbent was prepared by a method similar to that of Example 3, except that the formulation of the absorbent was different, as specifically shown in Table 4.

[0079] Table 4

[0080]

[0081] Example 5

[0082] The formulation of this example is as shown in Table 5 below:

[0083] Table 5

[0084]

[0085]

[0086] Method for preparing the olefinic VOC absorbent:

[0087] The hydrogen bond donor, hydrogen bond acceptor, and composite component were brought into first contact at 300 rpm and 60 °C for 60 min to obtain the olefinic VOC absorbent.

[0088] Example 6

[0089] In this example, an olefinic VOC absorbent was prepared by a method similar to that of Example 5, except that the formulation of the absorbent was different, as specifically shown in Table 6.

[0090] Table 6

[0091]

[0092] Example 7

[0093] In this example, an olefinic VOC absorbent was prepared by a method similar to that of Example 5, except that the formulation of the absorbent was different, as specifically shown in Table 7.

[0094] Table 7

[0095]

[0096] Example 8

[0097] In this example, an olefinic VOC absorbent was prepared by a method similar to that of Example 1, except that the amount of the hydrogen bond donor (CH3(CH2)3CH2COOH) used in this example was 2 mol; the remaining steps were the same as those of Example 1.

[0098] Example 9

[0099] In this example, an olefinic VOC absorbent was prepared using a method similar to that of Example 3. The difference is that the amount of the hydrogen bond donor (CH3(CH2)7CH2COOH) used in this example was 4 mol; the remaining steps were the same as those in Example 3.

[0100] Example 10

[0101] In this example, an olefinic VOC absorbent was prepared using a method similar to that of Example 5. The difference is that the amount of dipentene used in this example was 0.05 mol; the amount of ethyl benzoate used was 0.15 mol.

[0102] Example 11

[0103] In this example, an olefinic VOC absorbent was prepared using a method similar to that of Example 5. The difference is that the amount of CH3(CH2)7CH2COOH used in this example was 6 mol, and the amount of CH3(CH2)7CH=CH(CH2)7COOH used was 2 mol; the remaining steps were the same as those in Example 5.

[0104] Comparative Example 1

[0105] In this comparative example, an olefinic VOC absorbent was prepared using a method similar to that of Example 1. The difference is that 0.03 mol of dipentene was used to replace 0.03 mol of ethyl benzoate in this comparative example; the remaining steps were the same as those in Example 1.

[0106] Comparative Example 2

[0107] In this comparative example, an olefinic VOC absorbent was prepared using a method similar to that of Example 1. The difference is that CH3CH2CH2COOH in an equimolar amount was used to replace CH3(CH2)3CH2COOH in this comparative example; the remaining steps were the same as those in Example 1.

[0108] Comparative Example 3

[0109] In this comparative example, an olefinic VOC absorbent was prepared using a method similar to that of Example 1. The difference is that the amount of CH3(CH2)3CH2COOH used in this comparative example was 0.05 mol; the remaining steps were the same as those in Example 1.

[0110] Comparative Example 4

[0111] In this comparative example, an olefinic VOC absorbent was prepared using a method similar to that of Example 5. The difference is that the amount of dipentene used in this comparative example was 0.15 mol, and the amount of ethyl benzoate used was 0.15 mol; the remaining steps were the same as those in Example 5.

[0112] Test Example 1 Absorption Capacity Test

[0113] Under the conditions of 25 °C and 101.3 kPa, olefinic VOCs (ethylene 5% vol, propylene 10% vol, styrene 85% vol) were continuously introduced into the olefinic VOCs absorbent prepared in the above example. When the VOCs content in the absorbent could no longer increase, it was considered to reach absorption saturation, and the absorption amount of the olefinic VOCs absorbent at this time was measured as the absorption capacity of the olefinic VOCs absorbent.

[0114] Test Example 2: Test on the Removal Effect of Olefinic VOCs

[0115] The removal of olefinic VOCs in the waste gas was completed in a packed absorption tower. The waste gas contained 90% vol of nitrogen, 0.5% vol of ethylene, 1% vol of propylene, and 8.5% vol of styrene. The packing was φ3mm Raschig rings, and the theoretical number of stages was 20. The waste gas and the olefinic VOCs absorbent flowed into the packed absorption tower from the lower end and the upper end respectively, and the feed volume ratio of the waste gas to the olefinic VOCs absorbent was 8:1.

[0116] The waste gas and the absorbent were in countercurrent contact in the absorption tower. The contact temperature was 25 °C, the contact pressure was 0.1 MPa, and the contact time was 1 min.

[0117] After absorption, the absorbent liquid was discharged from the bottom of the packed absorption tower. The purified gas was discharged from the top of the packed absorption tower. A detection device equipped with a flame ionization detector or a photoionization detector was used to detect the content of olefinic volatile organic compounds, and the removal rates R of ethylene, propylene, and styrene were calculated.

[0118] R 乙烯 =(Y in,乙烯 -Y out,乙烯 ) / Y in,乙烯 ×100%

[0119] R 丙烯 =(Y in,丙烯 -Y out,丙烯 ) / Y in,丙烯 ×100%

[0120] R 苯乙烯 =(Y in,苯乙烯 -Y out,苯乙烯 ) / Y in,苯乙烯 ×100%

[0121] Among them, Y in represents the volume of olefinic volatile organic compounds in the waste gas per unit time, and Y out represents the volume of olefinic volatile organic compounds in the purified gas per unit time.

[0122] The specific test data are shown in Table 8 below.

[0123] Table 8

[0124]

[0125] As can be seen from the results in the above table, the olefinic VOCs absorbent provided by the present invention has a high absorption capacity for olefinic VOCs and a high removal efficiency for olefinic VOCs in the waste gas.

[0126] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. An olefin-based VOCs absorbent, characterized in that, The absorbent contains a hydrogen bond acceptor, a hydrogen bond donor, and a composite component in a molar ratio of 1:1 - 8:0.01 - 0.2; The hydrogen bond donor is provided by a fatty acid with the molecular formula R-COOH, where R is selected from an alkyl group with C5-C 10 and an alkenyl group with C 16 -C 18 ; The composite component is a combination of component A and component B; component A is at least one of dipentene and terpinene; component B is at least one of ethyl benzoate and isophorone; The hydrogen bond acceptor is selected from at least one of menthol and quaternary ammonium bromide; The absorbent has a saturated vapor pressure less than 80 Pa at 25 °C, a saturated water content less than 1 mol%, and a freezing point less than 10 °C.

2. The olefin-based VOCs absorbent according to claim 1, wherein, The hydrogen bond donor is provided by a fatty acid with the molecular formula R-COOH, and R is selected from at least one of CH3(CH2)3CH2-, CH3(CH2)7CH2-, and CH3(CH2)7CH=CH(CH2)6CH2-; 3. The olefin-based VOCs absorbent according to claim 1 or 2, wherein The quaternary ammonium bromide is tetraoctylammonium bromide.

4. The olefinic VOC absorbent according to any one of claims 1-3, wherein In the composite component, the content molar ratio of component A to component B is 1:0.1 - 2.

5. The olefinic VOCs absorbent according to any one of claims 1-3, wherein, The hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donor is selected from at least one of CH3(CH2)3CH2COOH, CH3(CH2)7CH2COOH, and CH3(CH2)7CH=CH(CH2)6CH2COOH; and the content molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3 - 8:0.05 - 0.

2.

6. The olefin-based VOCs absorbent according to any one of claims 1-3, wherein, The hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donor is CH3(CH2)3CH2COOH; and the content molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3 - 5:0.05 - 0.

1.

7. The olefin-based VOCs absorbent according to any one of claims 1-4, wherein, The hydrogen bond acceptor is tetraoctylammonium bromide, and the hydrogen bond donors are CH3(CH2)7CH=CH(CH2)7COOH and CH3(CH2)7CH2COOH; and the content molar ratio of the hydrogen bond acceptor, hydrogen bond donors, and composite component is 1:6 - 8:0.05 - 0.2, and the content molar ratio of CH3(CH2)7CH2COOH to CH3(CH2)7CH=CH(CH2)7COOH is 1:0.6 - 1.

5.

8. The olefin-based VOC absorbent according to claim 1 or 2, wherein, The hydrogen bond acceptor is menthol, and the hydrogen bond donor is CH3(CH2)7CH2COOH; and the content molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 3:0.01 - 0.

1.

9. A preparation method of an olefin-based VOCs absorbent, characterized in that, The method includes the following steps: Conduct a first contact of the hydrogen bond acceptor, hydrogen bond donor, and composite component to obtain an olefinic VOCs absorbent; The usage molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 8:0.01 - 0.2; The definitions of the composite component, hydrogen bond acceptor, and hydrogen bond donor are the same as those defined in any one of claims 1 - 8.

10. The method according to claim 9, wherein, The first contact is by ultrasonic oscillation; the conditions of the first contact include: the time of ultrasonic oscillation is 20 - 80 min, and the temperature is 30 - 80 °C.

11. The method according to claim 9, wherein, The first contact is by stirring; the conditions of the first contact include: the temperature is 30 - 80 °C, and the stirring time is 30 - 90 min.

12. An olefin-based VOC absorbent prepared by the method according to any one of claims 9-11.

13. The olefin-based VOC absorbent according to any one of claims 1-8 and 12 is used to absorb at least one olefin-based volatile organic compound in ethylene, propylene, butadiene, and styrene.

14. The application according to claim 13, wherein, The absorption capacity of the absorbent for olefin-based VOCs at 25 °C > 100 g / kg.

15. A method for removing olefinic VOCs from waste gas, characterized in that, The method includes: secondarily contacting the waste gas with the absorbent to obtain a mixture containing olefin-based VOCs; The absorbent is the olefin-based VOC absorbent according to any one of claims 1-8 and 12.

16. The method according to claim 15, wherein, The feed volume ratio of the waste gas to the olefin-based VOCs is 2-30:1; Preferably, the conditions for the second contact include: temperature is 10-40 °C, pressure is 0.1-0.5 MPa, and time is 0.2-2 min.

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