Alkane volatile organic compound absorbent, preparation method and application thereof, and method for removing alkane volatile organic compounds

Abstract

The invention relates to the field of alkane volatile organic compound absorption treatment, and discloses an alkane volatile organic compound absorbent, a preparation method and application thereof, and a method for removing alkane volatile organic compounds. The absorbent contains a hydrogen bond acceptor, a hydrogen bond donor and a composite component in a molar ratio of 1: (1-4): (0.01-0.1), wherein the hydrogen bond donor is selected from at least one of C12-18 saturated fatty acid and C12-18 monounsaturated fatty acid; the hydrogen bond receptor is selected from at least one of menthol, thymol and lidocaine; the composite component is a combination of a component A and a component B; the absorbent provided by the invention has the characteristics of low volatility, good stability and simple preparation process, and particularly has high absorption efficiency on C2-C4 alkanes.

Description

Technical Field

[0001] The present invention relates to the field of absorption treatment of alkane volatile organic compounds, and specifically relates to an absorbent for alkane volatile organic compounds, a preparation method and application thereof, and a method for removing alkane volatile organic compounds. Background Art

[0002] In recent years, the emission standards for volatile organic compounds (VOCs) have become increasingly strict, and non-methane total hydrocarbon milligram-level emission standards have been implemented in many places. Therefore, the deep recovery technology of VOCs has become a research hotspot in the environmental protection field. Hydrocarbon organic compounds are an important component of VOCs. For hydrocarbon VOCs, especially C2-C4 light hydrocarbons, due to their stable properties, low polarity, difficulty in liquefaction, and difficulty in enrichment, they have always been a key problem in achieving the deep treatment of VOCs.

[0003] At present, the VOCs recovery technologies that achieve milligram-level emissions of VOCs on the market all adopt adsorption combination processes with activated carbon as the adsorbent. However, dust and carbon oxides are generated during the production process of activated carbon; during use, the adsorption heat effect makes the activated carbon bed layer prone to local "temperature runaway" phenomena, posing safety hazards. In addition, the service life of activated carbon is limited, and waste carbon, as hazardous waste, increases the operating cost of enterprises. Therefore, the development of new green VOCs deep recovery technologies has become an inevitable trend in the coordinated treatment of pollution reduction and carbon reduction.

[0004] The absorption method realizes the recovery of gas through the dissolution of the absorbent, and has the advantages of mature process, simple equipment, wide application range, etc. In view of the fact that most VOCs, especially hydrocarbon VOCs, are hydrophobic, gasoline, diesel, or other organic solvents are usually used as absorbents in industry. However, such absorbents often have a high vapor pressure and are extremely volatile during use, and the volatile gas of the absorbent may also belong to VOCs. In industry, the absorption method is generally used as a front-end treatment process and cannot achieve the deep recovery of VOCs.

[0005] Therefore, there is an urgent need to provide a new absorbent for alkane volatile organic compounds with a low saturated vapor pressure, high absorption capacity, and good absorption effect. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems of high saturated vapor pressure and poor absorption effect existing in the existing alkane absorbents.

[0007] To achieve the above purpose, in the first aspect of the present invention, an absorbent for alkane volatile organic compounds is provided, and the absorbent contains a composite component, a hydrogen bond donor, and a hydrogen bond acceptor.

[0008] The hydrogen bond donor is selected from saturated fatty acids of C 12-18 and saturated fatty acids of C 12-18at least one of the monounsaturated fatty acids;

[0009] The hydrogen bond acceptor is selected from at least one of menthol, thymol, and lidocaine;

[0010] The composite component is a combination of component A and component B; Component A is at least one of p-xylene and methylcyclohexane; Component B is citronellol, C 4-8 at least one of the saturated monohydric fatty alcohols;

[0011] The molar ratio of the contents of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 4:0.01 - 0.1;

[0012] The absorbent has a saturated vapor pressure of less than 80 Pa at 25°C, a saturated water content of less than 2.0 mol%, a freezing point of less than 10°C, and a viscosity of less than 30 mPa·s.

[0013] The second aspect of the present invention provides a method for preparing an absorbent for alkane volatile organic compounds, the method comprising the following steps:

[0014] The composite component, hydrogen bond acceptor, and hydrogen bond donor are subjected to a first contact to obtain an absorbent for alkane volatile organic compounds;

[0015] The molar ratio of the amounts of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 4:0.01 - 0.1;

[0016] The definitions of the composite component, hydrogen bond acceptor, and hydrogen bond donor are the same as those defined in the first aspect.

[0017] The third aspect of the present invention provides an absorbent for alkane volatile organic compounds prepared by the method described in the second aspect.

[0018] The fourth aspect of the present invention provides that the absorbent for alkane volatile organic compounds described in the first aspect and the second aspect is used to absorb at least one alkane volatile organic compound among ethane, propane, and n-butane.

[0019] The fifth aspect of the present invention provides a method for removing alkane volatile organic compounds from waste gas. The waste gas is brought into a second contact with the absorbent to obtain a mixture containing alkane volatile organic compounds;

[0020] The absorbent is the absorbent for alkane volatile organic compounds described in the first aspect and / or the second aspect.

[0021] The present invention is prepared by compounding a hydrogen bond acceptor, a hydrogen bond donor, and a composite component with a molar ratio of 1:1 - 4:0.01 - 0.1. The resulting alkane volatile organic compound absorbent has the characteristics of low viscosity, easy mass transfer, low volatility, good stability under low-temperature conditions, and simple preparation process. In particular, it has a high absorption efficiency for C2 - C4 alkanes, can solve the problems of secondary pollution and absorbent loss caused by conventional organic absorbents, and achieve deep recovery of alkane VOCs. Detailed Embodiments

[0022] 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, the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values 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.

[0023] As described above, in the first aspect of the present invention, an absorbent for alkane volatile organic compounds is provided, and the absorbent contains a composite component, a hydrogen bond donor, and a hydrogen bond acceptor.

[0024] The hydrogen bond donor is selected from at least one of saturated fatty acids with C 12-18 and monounsaturated fatty acids with C 12-18 ;

[0025] The hydrogen bond acceptor is selected from at least one of menthol, thymol, and lidocaine;

[0026] The composite component is a combination of component A and component B; component A is at least one of p-xylene and methylcyclohexane; component B is at least one of citronellol and saturated monohydric fatty alcohols with C 4-8 ;

[0027] The molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 4:0.01 - 0.1;

[0028] The saturated vapor pressure of the absorbent at 25°C is less than 80 Pa, the saturated water content is less than 2.0 mol%, the freezing point is less than 10°C, and the viscosity is less than 30 mPa·s.

[0029] In the present invention, the viscosity of the absorbent is measured using a viscometer at 25°C.

[0030] In the present invention, the saturated vapor pressure of the absorbent for alkane volatile organic compounds is determined by thermogravimetric analysis, and the saturated water content is determined according to the Karl Fischer titration method. The calculation formula for the saturated water content x w of each absorbent hereinafter is as follows: x w = nw / (n w +S)×100%;

[0031] Wherein, n w is the amount of substance of water, and S is the total molar amount of the absorbent components.

[0032] Preferably, the hydrogen bond donor is selected from saturated fatty acids with C 12-14 and monounsaturated fatty acids with C 18 at least one of them.

[0033] More preferably, the hydrogen bond donor is selected from at least one of dodecanoic acid, myristic acid, and oleic acid. The inventors found that in this preferred case, the obtained absorbent has a better absorption effect on alkane volatile organic compounds.

[0034] Preferably, the component B is at least one of citronellol and saturated monohydric fatty alcohols with C 4-6 .

[0035] Preferably, the saturated monohydric fatty alcohol with C 4-6 is selected from at least one of n-butanol and n-hexanol.

[0036] Preferably, in the composite component, the molar ratio of the content of component A to component B is 1:0.1 - 1. The inventors found that under this preferred condition, the obtained absorbent has a better absorption effect on alkane volatile organic compounds.

[0037] According to the preferred specific embodiment 1, the hydrogen bond donor is oleic acid, and the hydrogen bond acceptor is selected from menthol and / or thymol; and the molar ratio of the content of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 3:0.01 - 0.1.

[0038] According to the preferred specific embodiment 1-1, the hydrogen bond donor is oleic acid, and the hydrogen bond acceptor is menthol, and the molar ratio of the content of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 3:0.05 - 0.1.

[0039] According to the preferred specific embodiment 1-2, the hydrogen bond donor is oleic acid, and the hydrogen bond acceptor is menthol and thymol, and the molar ratio of the content of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 3:0.01 - 0.1, and the ratio of menthol to thymol is 1:0.2 - 1. The inventors found that under this preferred condition, the obtained absorbent has a lower freezing point and a better absorption effect on alkane volatile organic compounds.

[0040] According to the preferred specific embodiment 2, the hydrogen bond donor is dodecanoic acid, the hydrogen bond acceptor is thymol, and the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:2 - 4:0.01 - 0.1.

[0041] According to the preferred specific embodiment 3, the hydrogen bond donor is myristic acid, the hydrogen bond acceptor is lidocaine, and the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 3:0.01 - 0.1.

[0042] As mentioned above, the second aspect of the present invention provides a method for preparing an absorbent for alkane volatile organic compounds, the method comprising the following steps:

[0043] Bring the composite component, hydrogen bond acceptor, and hydrogen bond donor into first contact to obtain an absorbent for alkane volatile organic compounds;

[0044] The molar ratio of the amounts used of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1 - 4:0.01 - 0.1;

[0045] The definitions of the composite component, hydrogen bond acceptor, and hydrogen bond donor are the same as those defined in the first aspect.

[0046] The amounts and types of the respective components involved in the second aspect of the present invention are the same as the contents and types of the corresponding components described in the first aspect of the present invention, and will not be elaborated herein. Those skilled in the art should not construe this as a limitation of the present invention.

[0047] Preferably, in the composite component, the molar ratio of component A to component B is 1:0.1 - 1.

[0048] Preferably, the manner of the first contact is selected from at least one of ultrasonic oscillation and stirring.

[0049] According to a preferred specific embodiment, the first contact is carried out under stirring conditions, and the conditions of the first contact at least satisfy: the temperature is 30 - 80°C, and the stirring time is 30 - 90 min. Preferably, the conditions of the first contact at least satisfy: the temperature is 50 - 70°C, and the stirring time is 40 - 80 min.

[0050] According to another preferred specific embodiment, the first contact is carried out under ultrasonic oscillation conditions, and the conditions of the first contact at least satisfy: the ultrasonic oscillation time is 20 - 80 min, and the temperature is 30 - 80°C. Preferably, the conditions of the first contact at least satisfy: the ultrasonic oscillation time is 40 - 70 min, and the temperature is 50 - 70°C.

[0051] The present invention has no special requirements for the rotation speed of the stirring and the frequency of the ultrasonic oscillation, and those skilled in the art can select according to needs.

[0052] As described above, the third aspect of the present invention provides an alkane volatile organic compound absorbent prepared by the method described in the second aspect.

[0053] As described above, the fourth aspect of the present invention provides that the alkane volatile organic compound absorbent described in the first aspect and the second aspect is used to absorb at least one alkane volatile organic compound among ethane, propane, and n-butane.

[0054] Preferably, the absorbent has an absorption capacity for alkane volatile organic compounds > 80 g / kg at 25°C. More preferably, the absorbent has an absorption capacity for alkane volatile organic compounds > 100 g / kg at 25°C.

[0055] In the present invention, the absorption capacity is determined by the saturated solubility measurement method.

[0056] As described above, the fifth aspect of the present invention provides a method for removing alkane volatile organic compounds from waste gas. The waste gas is brought into second contact with the absorbent to obtain a mixture containing alkane volatile organic compounds; the absorbent is the alkane volatile organic compound absorbent described in the first aspect and the second aspect.

[0057] Preferably, the feed volume ratio of the waste gas to the alkane volatile organic compound is 2 - 20:1. More preferably, the feed volume ratio of the waste gas to the alkane volatile organic compound is 2 - 10:1. The inventors found that in this preferred case, the absorbent has a better absorption effect and lower energy consumption.

[0058] Preferably, the conditions of the second contact at least satisfy: the temperature is 10 - 40°C, the pressure is 0.1 - 0.5 MPa, and the time is 0.2 - 2 min.

[0059] Preferably, the waste gas contains 1 - 20 vol% of alkane volatile organic compounds.

[0060] The present invention will be described in detail below by way of 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. The experimental methods, detection methods, etc. involved in the following examples, unless otherwise specified, are all conventional experimental methods, detection methods, etc. existing in the prior art.

[0061] Example 1

[0062] This example is used to illustrate that the alkane volatile organic compound absorbent of the present invention is prepared according to the formula in Table 1 and by the method described below to prepare the alkane volatile organic compound absorbent;

[0063] Preparation method of alkane volatile organic compound absorbent:

[0064] Stir the hydrogen bond acceptor, hydrogen bond donor and composite component at 300 rpm and 70 °C for 80 min to obtain the alkane volatile organic compound absorbent;

[0065] In this example, the amount of the hydrogen bond acceptor is 1 mol, and the molar ratio of the amounts of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3:0.1;

[0066] In the composite component, the molar ratio of the amounts of component A and component B is 1:1;

[0067] The hydrogen bond acceptor is menthol, the hydrogen bond donor is oleic acid, component A is p-xylene, and component B is citronellol.

[0068] Example 2

[0069] This example is used to illustrate that the alkane volatile organic compound absorbent of the present invention is prepared according to the formula in Table 1 and by the method described below to prepare the alkane volatile organic compound absorbent;

[0070] Preparation method of alkane volatile organic compound absorbent:

[0071] Ultrasonically oscillate the hydrogen bond acceptor, hydrogen bond donor and composite component at 60 °C under ultrasonic conditions for 60 min to obtain the alkane volatile organic compound absorbent;

[0072] Among them, the amount of the hydrogen bond acceptor is 1 mol, and the molar ratio of the amounts of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:1:0.05;

[0073] In the composite component, the molar ratio of the amounts of component A and component B is 1:0.25;

[0074] The hydrogen bond acceptor is menthol, the hydrogen bond donor is oleic acid, component A is methylcyclohexane, and component B is n-butanol.

[0075] Examples 3-10 are prepared by a method similar to that of Example 1 to prepare the alkane volatile organic compound absorbent, except that the formula of the alkane volatile organic compound absorbent is different, and the specific formula can be seen in Table 1.

[0076] Table 1

[0077]

[0078] Example 11

[0079] In this example, an absorbent for alkane volatile organic compounds was prepared by a method similar to that in Example 1. The difference is that the formulation of the absorbent is different. See Table 2 for details.

[0080] Table 2

[0081]

[0082]

[0083] Example 12

[0084] In this example, an absorbent for alkane volatile organic compounds was prepared by a method similar to that in Example 1. The difference is that the formulation of the absorbent is different. See Table 3 for details.

[0085] Table 3

[0086]

[0087] Comparative Example 1

[0088] In this comparative example, an absorbent for alkane volatile organic compounds was prepared by a method similar to that in Example 1. The difference is that in this comparative example, component A (p-xylene) with an equimolar amount was used to replace component B (citronellol);

[0089] The remaining steps are the same as those in Example 1.

[0090] Comparative Example 2

[0091] In this comparative example, an absorbent for alkane volatile organic compounds was prepared by a method similar to that in Example 1. The difference is that in this comparative example, the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:3:0.15; and in the composite component, the molar ratio of the amounts of component A and component B used is 1:1;

[0092] The remaining steps are the same as those in Example 1.

[0093] Comparative Example 3

[0094] In this comparative example, an absorbent for alkane volatile organic compounds was prepared by a method similar to that in Example 1. The difference is that in this comparative example, the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:5:0.1; and in the composite component, the molar ratio of the amounts of component A and component B used is 1:1;

[0095] The remaining steps are the same as those in Example 1.

[0096] Comparative Example 4

[0097] This comparative example used a method similar to that of Example 1 to prepare an absorbent for alkane volatile organic compounds. The difference is that in this comparative example, the molar ratio of the hydrogen bond acceptor, hydrogen bond donor, and composite component is 1:0.5:0.1; and in the composite component, the molar ratio of component A to component B is 1:1;

[0098] The remaining steps were the same as those in Example 1.

[0099] Comparative Example 5

[0100] This comparative example used a method similar to that of Example 1 to prepare an absorbent for alkane volatile organic compounds. The difference is that in this comparative example, the hydrogen bond donor is n-butyric acid.

[0101] Test Example 1

[0102] Absorption capacity test

[0103] Under the conditions of 25 °C and 101.3 kPa, alkane VOCs (simulated by 20 vol% ethane, 25 vol% propane, and 55 vol% n-butane) were continuously passed into the absorbent for alkane volatile organic compounds prepared in the above examples. When the content of VOCs in the absorbent could no longer increase, it was considered to reach absorption saturation, and the absorption amount of alkane VOCs at this time was measured as the absorption capacity of the absorbent for alkane volatile organic compounds.

[0104] Test Example 2

[0105] Test on the removal effect of alkane volatile organic compounds in waste gas

[0106] The removal of alkane volatile organic compounds in the waste gas was completed in a packed absorption tower. The waste gas contained 90 vol% nitrogen, 2 vol% ethane, 2.5 vol% propane, and 5.5 vol% n-butane. The packing was φ3 mm Raschig rings, and the theoretical number of plates was 20; the waste gas and the absorbent flowed into the packed absorption tower from the lower end and the upper end respectively. The feed volume ratio of the waste gas to the absorbent was 6:1;

[0107] 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 0.5 min;

[0108] 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 alkane volatile organic compounds, and the removal rate R of ethane, propane, and n-butane was calculated;

[0109] R 乙烷 =(Y in,乙烷 -Y out,乙烷 ) / Y in,乙烷 ×100%

[0110] R 丙烷 = (Y in,丙烷 - Y out,丙烷 ) / Y in,丙烷 × 100%

[0111] R 正丁烷 = (Y in,正丁烷 - Y out,正丁烷 ) / Y in,正丁烷 × 100%

[0112] Wherein, Y in represents the volume of alkane volatile organic compounds in the waste gas per unit time, and Y out represents the volume of alkane volatile organic compounds in the purified gas per unit time.

[0113] The specific test data are shown in Table 4 below.

[0114] Table 4

[0115]

[0116]

[0117] It can be seen from the above results that the absorbent for alkane volatile organic compounds provided by the present invention has the characteristics of low saturated vapor pressure and good absorption effect on alkane volatile organic compounds.

[0118] 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 absorbent for alkane volatile organic compounds, characterized in that The absorbent contains a composite component, a hydrogen bond donor, and a hydrogen bond acceptor. The hydrogen bond acceptor and / or the hydrogen bond donor contains a weakly polar single bond structure; the weakly polar single bond structure is selected from at least one of an alkyl group and a cycloalkyl group. The hydrogen bond donor is selected from C 12-18 Saturated fatty acids, C 12-18 At least one of the monounsaturated fatty acids; The hydrogen bond acceptor is selected from at least one of menthol, thymol, and lidocaine. The composite component is a combination of component A and component B; component A is at least one of p-xylene and methylcyclohexane; component B is at least one of citronellol and saturated monohydric aliphatic alcohols of C 4-8 ​ The molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 4:0.01 - 0.

1. The saturated vapor pressure of the absorbent at 25°C is less than 80 Pa, the saturated water content is less than 2.0 mol%, the freezing point is less than 10°C, and the viscosity is less than 30 mPa·s.

2. The alkane volatile organic compound absorbent according to claim 1, wherein, The hydrogen bond donor is selected from at least one of saturated fatty acids with C 12-14 and monounsaturated fatty acids with C 18 . Preferably, the hydrogen bond donor is selected from at least one of dodecanoic acid, myristic acid, and oleic acid. Preferably, in the composite component, the molar ratio of the content of component A to component B is 1:0.1 - 1.

3. The alkane volatile organic compound absorbent according to claim 1 or 2, wherein, The hydrogen bond donor is oleic acid, the hydrogen bond acceptor is selected from menthol and / or thymol; and the molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 3:0.01 - 0.

1.

4. The alkane volatile organic compound absorbent according to claim 3, wherein, The hydrogen bond donor is oleic acid, the hydrogen bond acceptor is menthol, and the molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 3:0.05 - 0.

1.

5. The alkane volatile organic compound absorbent according to claim 3, wherein, The hydrogen bond donor is oleic acid, the hydrogen bond acceptor is menthol and thymol, and the molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 3:0.01 - 0.1, and the ratio of menthol to thymol is 1:0.2 - 1.

6. The alkane volatile organic compound absorbent according to claim 1 or 2, wherein, The hydrogen bond donor is dodecanoic acid, the hydrogen bond acceptor is thymol, and the molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:2 - 4:0.01 - 0.

1.

7. The alkane volatile organic compound absorbent according to claim 1 or 2, wherein The hydrogen bond donor is myristic acid, the hydrogen bond acceptor is lidocaine, and the molar ratio of the contents of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 3:0.01 - 0.

1.

8. A preparation method of an alkane volatile organic compound absorbent, characterized in that, The method includes the following steps: The composite component, the hydrogen bond acceptor, and the hydrogen bond donor are subjected to a first contact to obtain an absorbent for alkane volatile organic compounds. The molar ratio of the amounts used of the hydrogen bond acceptor, the hydrogen bond donor, and the composite component is 1:1 - 4:0.01 - 0.

1. The definitions of the composite component, the hydrogen bond acceptor, and the hydrogen bond donor are the same as those defined in any one of claims 1 - 7.

9. The method according to claim 8, wherein The mode of the first contact is selected from at least one of ultrasonic oscillation and stirring.

10. The method according to claim 9, wherein, The first contact is carried out under stirring conditions, and the conditions of the first contact at least satisfy: the temperature is 30 - 80°C, and the stirring time is 30 - 90 min.

11. The method according to claim 9, wherein, The first contact is carried out under ultrasonic oscillation conditions, and the conditions of the first contact at least satisfy: the time of ultrasonic oscillation is 20 - 80 min, and the temperature is 30 - 80°C.

12. An absorbent for alkane volatile organic compounds prepared by the method according to any one of claims 8 - 11.

13. The absorbent for alkane volatile organic compounds according to any one of claims 1 - 7, 12 is used to absorb at least one alkane volatile organic compound among ethane, propane, and n-butane.

14. The application according to claim 13, wherein, The absorbent has an absorption capacity for alkane volatile organic compounds > 80 g / kg at 25°C. Preferably, the absorbent has an absorption capacity for alkane volatile organic compounds > 100 g / kg at 25°C.

15. A method for removing alkane volatile organic compounds from waste gas, characterized in that, The waste gas is brought into second contact with the absorbent to obtain a mixture containing alkane volatile organic compounds; The absorbent is the absorbent for alkane volatile organic compounds according to any one of claims 1-7, 12.

16. The method according to claim 15, wherein, The feed volume ratio of the waste gas to the absorbent for alkane volatile organic compounds is 2-20:1; Preferably, the conditions of the second contact at least satisfy: the temperature is 10-40°C, the pressure is 0.1-0.5 MPa, and the time is 0.2-2 min.

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