An absorption liquid for absorbing asphalt fume and oil mist exhaust gas, a preparation method and application thereof

Abstract

The application provides an absorption liquid for absorbing asphalt fume and oil mist waste gas, a preparation method and application, and relates to the field of waste gas treatment. The absorption liquid is prepared from the following raw materials in mass percentage: polyethylene glycol dimethyl ether 60-80%; demulsifier 5-15%; dispersion polymerization inhibitor 3-10%; oxidant carrier 1-3%; slow-release particles 2-9%; cosolvent 5-12%; and defoaming agent 0.1-1%. In the application, the anti-adhesion and polymerization resistance performance are improved through the compounding of various solvents, the continuous operation cycle of the equipment is prolonged to more than 90 days, the pressure difference of the filler is increased by less than 5%, and the frequent shutdown problem caused by asphalt fouling in the traditional technology is completely solved; meanwhile, the demulsification is efficient, the removal rate is high, and another possibility is provided for efficient, green and economic deep treatment of waste gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, and particularly relates to an absorption liquid for absorbing asphalt fume and oil mist waste gas, a preparation method and application. BACKGROUND

[0002] Asphalt fume and oil mist waste gas is mainly generated in asphalt mixing stations, waterproof roll production and road paving scenes, and has complex components and significant hazards, containing toxic substances such as polycyclic aromatic hydrocarbons, tar particles and mineral oil mist.

[0003] The current several treatment methods have obvious limitations. Although the simple physical adsorption method is simple to operate, high-viscosity asphalt is easy to block the micropores, and the adsorbent needs to be frequently replaced, which greatly increases the operation cost. The combustion method has high energy consumption for low-concentration waste gas, and incomplete oil mist combustion easily produces dioxin secondary pollution. The chemical absorption method is widely used, but the traditional water-based absorption liquid (such as lye) has a capture efficiency of less than 60% for hydrophobic oil mist, and cannot degrade carcinogenic polycyclic aromatic hydrocarbons. Although the organic solvent type absorption liquid can solubilize asphalt, it lacks anti-adhesion components, resulting in frequent fouling of equipment, which needs to be cleaned every two weeks, seriously affecting continuous production. In addition, the direct addition of oxidizing agents (such as hydrogen peroxide) in the prior art easily causes rapid decomposition and inactivation, and cannot continuously degrade pollutants, and the waste liquid contains undecomposed toxic substances and needs high-cost hazardous waste treatment.

[0004] Therefore, it is urgent to develop an absorption liquid with high-efficiency demulsification, anti-blocking, deep oxidation and waste liquid detoxification functions to solve the core defects of low removal rate, frequent maintenance, serious secondary pollution and high operation cost in the traditional technology.

[0005] In view of this, the present application is proposed. SUMMARY

[0006] In order to solve the above technical problems, the present application provides an absorption liquid for absorbing asphalt fume and oil mist waste gas, a preparation method and application. The absorption liquid of the present application is prepared by matching, which mainly solves the pain points of easy blocking, low efficiency, serious secondary pollution and difficult oil mist removal of the absorption liquid in the prior art. At the same time, the preparation method of the present application is simple, and is more in line with the requirements of green chemistry.

[0007] In order to achieve the purpose of the present application, the present application provides an absorption liquid for absorbing asphalt fume and oil mist waste gas, which is prepared from the following raw materials in mass percentage:

[0008] Polyethylene glycol dimethyl ether 60%-80%;

[0009] Demulsifier 5%-15%;

[0010] Dispersant polymerization inhibitor 3%-10%;

[0011] Oxidant carrier 1%-3%;

[0012] slow release particles 2-9%;

[0013] co-solvent 5-12%;

[0014] antifoam 0.1-1%.

[0015] Further,

[0016] polyethylene glycol dimethyl ether 70.7%;

[0017] demulsifier 9.5%;

[0018] dispersion inhibitor 5.7%;

[0019] oxidant carrier 2.0%;

[0020] slow release particles 4.0%;

[0021] co-solvent 7.0%;

[0022] antifoam 0.3%.

[0023] The balance to 100% is made up with deionized water.

[0024] Further, the mass ratio between the slow release particles and the oxidant carrier is (1-3): 1.

[0025] Further, the mass ratio between the slow release particles and the oxidant carrier is 2: 1.

[0026] Further, the slow release particles are hydrogen peroxide loaded silica;

[0027] Further, the pore size of the silica is 10-15 nm;

[0028] The demulsifier is any one or more of an EO-PO block copolymer, a fatty alcohol polyoxyethylene ether or an alkylphenol polyoxyethylene ether;

[0029] The dispersion inhibitor is any one or more of sodium dodecyl benzene sulfonate, lignin sulfonate, polyisobutylene succinimide, polyvinylpyrrolidone or polyethylene glycol;

[0030] The oxidant carrier is any one or more of urea peroxide or sodium percarbonate;

[0031] The co-solvent is any one or more of diisooctyl cyclohexane dicarboxylate, ethylene glycol monobutyl ether, diethylene glycol butyl ether, isopropyl alcohol or dibutyl phthalate;

[0032] The antifoam is a polysiloxane emulsion.

[0033] Further, the demulsifier is an EO-PO block copolymer;

[0034] The dispersion polymerization inhibitor is polyisobutylene succinimide;

[0035] The oxidant carrier is peroxide urea;

[0036] The cosolvent is cyclohexane dimethylate diisooctyl ester.

[0037] Further, the number average molecular weight of the polyisobutylene succinimide is 1300 Da-2500 Da; and the weight average molecular weight / number average molecular weight is greater than or equal to 2.0;

[0038] Further, the number average molecular weight of the polyisobutylene succinimide is 2000 Da.

[0039] The present application also provides a preparation method of an absorption liquid for absorbing asphalt fume and oil mist waste gas, comprising the following steps:

[0040] S1, dipping silica in hydrogen peroxide, stirring, filtering and drying to obtain slow-release particles;

[0041] S2, mixing the slow-release particles with an oxidant carrier, adding anhydrous ethanol for ball milling, and drying to obtain slow-release oxidizing particles;

[0042] S3, heating polyethylene glycol dimethyl ether, and then adding a cosolvent, a demulsifier and a dispersion polymerization inhibitor in sequence, and stirring uniformly until a uniform transparent solution is obtained;

[0043] S4, adding slow-release oxidizing particles to the uniform transparent solution and dispersing at a low speed;

[0044] S5, cooling, adding a defoaming agent, mixing uniformly, and filtering to obtain the product.

[0045] Further, the volume concentration of hydrogen peroxide in the S1 step is 30%.

[0046] Further, in the S1 step, stirring needs to be performed at 60-65℃ for 2-3h;

[0047] Further, stirring needs to be performed at 60℃ for 2h.

[0048] Further, in the S1 step, the drying temperature is 110℃, and the drying time is 20min.

[0049] Further, in the S2 step, the ball milling time of anhydrous ethanol is 1h;

[0050] Further, in the S2 step, the drying condition is vacuum drying at 60℃.

[0051] Further, in the S3 step, the polyethylene glycol dimethyl ether is heated to 50 DEG C.

[0052] Further, in the S4 step, the low-speed dispersion rate is no more than 120 rpm, and the dispersion time is 30 min-35 min.

[0053] Further, in the S4 step, the low-speed dispersion rate is 110 rpm, and the dispersion time is 30 min.

[0054] Further, in the S5 step, the temperature is lowered to 30 DEG C-35 DEG C.

[0055] The application further provides application of the absorption liquid for absorbing asphalt fume and oil mist waste gas in absorbing asphalt fume and oil mist waste gas.

[0056] The application has the following technical effects:

[0057] In the application, the anti-adhesion and polymerization inhibition performance are improved by compounding various solvents, the continuous operation period of equipment is prolonged to more than 90 days, the filler pressure difference growth is less than 5%, and the frequent shutdown problem caused by asphaltene fouling in the traditional technology is completely solved; meanwhile, the demulsification is efficient, the removal rate is high, and another possibility is provided for efficient, green and economic waste gas deep treatment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme of the application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0059] In a first aspect, the application provides an absorption liquid for absorbing asphalt fume and oil mist waste gas, which is prepared from the following raw materials in mass percentage:

[0060] Polyethylene glycol dimethyl ether 60%-80%;

[0061] Demulsifier 5%-15%;

[0062] Dispersed polymerization inhibitor 3%-10%;

[0063] Oxidant carrier 1%-3%;

[0064] Slow-release particles 2%-9%;

[0065] Cosolvent 5%-12%;

[0066] Defoaming agent 0.1%-1%.

[0067] In some embodiments,

[0068] Polyethylene glycol dimethyl ether 70.7%;

[0069] Demulsifier 9.5%;

[0070] Dispersant inhibitor 5.7%;

[0071] Oxidant carrier 2.0%;

[0072] Sustained-release particles 4.0%;

[0073] Cosolvent 7.0%;

[0074] Defoamer 0.3%.

[0075] The part less than 100% is supplemented with deionized water.

[0076] The asphalt contains tar, asphaltene and other viscous substances, which are easy to adhere to the filler or nozzle, and frequent cleaning is required. The traditional base absorption liquid has poor efficiency for capturing hydrophobic oil mist. In addition, the waste liquid contains difficult-to-degrade organic matter, and the components are complex, the treatment cost is high, and secondary pollution is easy to cause.

[0077] Therefore, in the design process of the present application, polyethylene glycol dimethyl ether is used as the base solvent. The solvent has low volatility, high boiling point, is not easy to volatilize itself, has polar and non-polar solubility, can efficiently capture hydrophobic asphalt fume and hydrophilic oil mist, and can efficiently dissolve asphaltene or tar. However, when the proportion of the solvent exceeds 80%, the viscosity of the absorbent will be greatly increased, which will hinder mass transfer. When the content of the solvent is less than 60%, the capture ability of the absorbent for asphalt fume and hydrophilic oil mist cannot be fully exerted, which leads to insufficient solubility and reduces the removal rate.

[0078] Meanwhile, the absorbent also contains demulsifier, dispersant inhibitor, oxidant carrier, sustained-release particles, cosolvent and defoamer. The demulsifier mainly acts on oil, which can destroy the oil-water interface film and promote the coalescence and floating separation of oil droplets. However, if the amount of the demulsifier is too large, micelles may be formed to wrap pollutants, which leads to the enrichment of pollutants and reduces the adsorption capacity of the absorbent for oil mist.

[0079] The dispersant inhibitor can be adsorbed on the surface of tar particles to provide steric hindrance and prevent adhesion and agglomeration of asphaltene, but the amount of the dispersant inhibitor also needs to be controlled to prevent the stability of the absorbent from being reduced due to excessive addition of the dispersant inhibitor.

[0080] The slow-release particles are used to adsorb hydrogen peroxide, so that it can be slowly released to oxidize and degrade PAHS such as benz[a]pyrene; because the slow-release particles have a large specific surface area and a large number of surface pores, they have sufficient carrying capacity; the oxidant carrier can load the slow-release particles to achieve slow release of hydrogen peroxide, ensure sufficient contact of hydrogen peroxide with pollutants, and realize continuous oxidation and degradation of pollutants. In addition, the slow-release particles can be reused.

[0081] The cosolvent can enhance the polarity compatibility, solubilize the hydrophobic components, and reduce the viscosity of the system. If the amount of the cosolvent is too low, the solubility will be insufficient, and if the amount of the cosolvent is too high, the efficiency of the polyethylene glycol dimethyl ether may be reduced. The main function of the defoamer is to inhibit the formation of foam during the absorption process, so as to avoid excessive foam that affects mass transfer.

[0082] In some embodiments, the mass ratio between the slow-release particles and the oxidant carrier is (1-3): 1.

[0083] In some embodiments, the mass ratio between the slow-release particles and the oxidant carrier is 2: 1.

[0084] In some embodiments, the slow-release particles are hydrogen peroxide-loaded silica;

[0085] In some embodiments, the pore size of the silica is 10-15 nm.

[0086] In the present application, the amount of slow-release particles and oxidant carrier is limited. When the amount of oxidant carrier is too large, the hydrogen peroxide in the slow-release particles will be released too quickly, resulting in a short activity of the slow-release particles and failing to achieve sufficient degradation of asphalt fume and oil mist. When the amount of oxidant carrier is too small, the carrying capacity of the slow-release particles will be reduced, thereby reducing the degradation efficiency.

[0087] When the mass ratio between the oxidant carriers is 2: 1, the ratio balances the slow-release rate and the oxidation capacity, and prolongs the service life of the oxidant to more than 60 days.

[0088] In some embodiments, the demulsifier is any one or more of EO-PO block copolymer, fatty alcohol polyoxyethylene ether, or alkylphenol polyoxyethylene ether;

[0089] The dispersion inhibitor is any one or more of sodium dodecyl benzene sulfonate, lignin sulfonate, polyisobutylene succinimide, polyvinylpyrrolidone, or polyethylene glycol;

[0090] The oxidant carrier is any one or more of peroxide urea or sodium percarbonate;

[0091] The co-solvent is any one or more of dicyclohexyl dimethyl ester, ethylene glycol monobutyl ether, diethylene glycol butyl ether, isopropyl alcohol, or dibutyl phthalate;

[0092] The defoaming agent is a polysiloxane emulsion.

[0093] In some embodiments, the demulsifier is an EO-PO block copolymer.

[0094] The dispersion polymerization inhibitor is polyisobutylene succinimide.

[0095] The oxidant carrier is urea peroxide.

[0096] The co-solvent is dicyclohexyl dimethyl ester.

[0097] The EO-PO block copolymer has good temperature sensitivity, the polyoxypropylene segment can insert into the oil-water interface film to destroy the stability of the emulsion, and the polyoxyethylene segment remains hydrophilic, while it can adapt to the temperature fluctuation of waste gas.

[0098] The oxidant carrier is urea peroxide, which is more stable than direct addition of hydrogen peroxide. A small amount of design can ensure the sustained activation of the slow-release particles, and excessive concentration may lead to excessive oxidation and the production of by-products; urea peroxide has moderate water solubility and a slower decomposition rate than sodium percarbonate, which meets the slow-release requirements. Peroxide urea slowly releases H2O2 in the pores of silicon dioxide (5-10 nm), avoiding rapid decomposition and inactivation.

[0099] Polyisobutylene succinimide has a comb-like molecular structure, and strong space can resist asphaltene aggregation.

[0100] Dicyclohexyl dimethyl ester itself has a high boiling point and low volatility, which can effectively reduce the operating loss.

[0101] In some embodiments, the number average molecular weight of the polyisobutylene succinimide is 1300 Da-2500 Da; and the weight average molecular weight / number average molecular weight is ≥2.0.

[0102] Further, the number average molecular weight of the polyisobutylene succinimide is 2000 Da.

[0103] At room temperature, asphaltene is in glassy state and softens above 80℃. Traditional dispersants can only work in specific temperature range due to their single molecular weight. In polyisobutylene succinimide with wide molecular weight distribution (Mw / Mn≥2.0), low molecular weight part (1300 Da grade) penetrates into the micro-cracks of asphaltene like a "lubricant", and high molecular weight part (2500 Da grade) provides a three-dimensional barrier like a "scaffold", thereby forming a multi-layer adsorption film combined with the hydrophobic core of asphaltene, effectively preventing particle agglomeration. This design enables the dispersant to work stably in the temperature fluctuation range of 40℃-80℃ of waste gas. Different chain length molecules form a dense-loose gradient arrangement, which generates repulsive force on particles at different distances, and when part of the molecules are detached due to mechanical impact, other molecules in the wide distribution system can quickly migrate to the position.

[0104] The application also provides a preparation method of an absorption liquid for absorbing asphalt fume and oil mist waste gas, comprising the following steps:

[0105] S1, dipping silica in hydrogen peroxide, stirring, filtering and drying to obtain slow-release particles;

[0106] S2, mixing the slow-release particles with an oxidant carrier, adding anhydrous ethanol for ball milling, drying to obtain slow-release oxidized particles;

[0107] S3, heating polyethylene glycol dimethyl ether, then sequentially adding a cosolvent, a demulsifier and a dispersion polymerization inhibitor, stirring uniformly until a uniform transparent solution is obtained;

[0108] S4, adding slow-release oxidized particles to the uniform transparent solution and dispersing at low speed;

[0109] S5, cooling, adding a defoaming agent, mixing uniformly, filtering and obtaining the product.

[0110] In some embodiments, the volume concentration of hydrogen peroxide in the S1 step is 30%.

[0111] In some embodiments, the stirring in the S1 step needs to be performed at 60-65℃ for 2-3h.

[0112] In some embodiments, the stirring needs to be performed at 60℃ for 2h.

[0113] In some embodiments, the drying temperature in the S1 step is 110℃, and the drying time is 20min.

[0114] In some embodiments, the ball milling time of anhydrous ethanol in the S2 step is 1h.

[0115] In some embodiments, the drying condition in the S2 step is vacuum drying at 60℃.

[0116] In some embodiments, in the S3 step, the polyethylene glycol dimethyl ether is heated to 50°C.

[0117] In some embodiments, in the S4 step, the low-speed dispersion speed is no more than 120 rpm, and the dispersion time is 30 min-35 min.

[0118] In this step, the dispersion speed needs to be controlled to ensure the integrity of the particles and make them disperse uniformly.

[0119] In some embodiments, in the S4 step, the low-speed dispersion speed is 110 rpm, and the dispersion time is 30 min.

[0120] In some embodiments, in the S5 step, the temperature is lowered to 30°C-35°C.

[0121] The preparation method of the present application is simple, and the precise control of the reaction conditions systematically solves the three major pain points of blockage, low efficiency, and secondary pollution in asphalt smoke treatment, achieving high efficiency, low consumption, and long-period operation.

[0122] The following will be described in conjunction with specific embodiments:

[0123] Embodiment 1

[0124] S1, take silica particles with a pore size of 10 nm, place them in 30% volume concentration hydrogen peroxide, stir at 60°C for 2h, then filter, take the solid, and dry at 110°C to obtain H2O2 pre-loaded particles, weigh, and take 4g of H2O2 pre-loaded particles.

[0125] S2, take 2g of urea peroxide and 4g of H2O2 pre-loaded particles and ball mill in anhydrous ethanol for 1h, vacuum dry at 60°C to obtain slow-release oxidation particles.

[0126] S3, add 70.7g of polyethylene glycol dimethyl ether to the reaction kettle, heat to 50°C, then add 7g of cyclohexane dimethylate, 9.5g of EO-PO block copolymer, and 5.7g of polyisobutylene succinimide with a number average molecular weight of 2000Da, at this time the weight average molecular weight / number average molecular weight=2.0, stir until the solution is uniform and transparent.

[0127] S4, then add the prepared slow-release oxidation particles to it, and disperse at 110 rpm for 30 min.

[0128] S5, lower the temperature to 30°C, add 0.3g of polysiloxane emulsion and 0.8g of deionized water, mix uniformly, and then filter.

[0129] Embodiment 2

[0130] The specific embodiment is consistent with Example 1, only the amount of each component is changed, as follows:

[0131] Polyethylene glycol dimethyl ether 80 g, cyclohexane dimethylate 5 g, EO-PO block copolymer 5 g, polyisobutylene succinimide 3 g, slow-release particles 2 g, peroxide urea 1 g, polysiloxane emulsion 0.1 g, deionized water 3.9 g.

[0132] Example 3

[0133] The specific embodiment is consistent with Example 1, only the amount of each component is changed, as follows:

[0134] Polyethylene glycol dimethyl ether 60 g, cyclohexane dimethylate 8 g, EO-PO block copolymer 10 g, polyisobutylene succinimide 9 g, slow-release particles 9 g, peroxide urea 3 g, polysiloxane emulsion 1 g.

[0135] Example 4

[0136] The specific embodiment is consistent with Example 1, only the number average molecular weight of polyisobutylene succinimide is changed to 2500 Da, and the weight average molecular weight / number average molecular weight=3.0.

[0137] Example 5

[0138] The specific embodiment is consistent with Example 1, the mass ratio between the slow-release particles and the oxidant carrier is changed to 1:1, specifically slow-release particles 3 g, peroxide urea 3 g.

[0139] Example 6

[0140] The specific embodiment is consistent with Example 1, the mass ratio between the slow-release particles and the oxidant carrier is changed to 3:1, specifically slow-release particles 4.5 g, peroxide urea 1.5 g.

[0141] Comparative Example 1

[0142] The specific embodiment is consistent with Example 1, the mass ratio between the slow-release particles and the oxidant carrier is changed to 5:1, specifically slow-release particles 5 g, peroxide urea 1 g.

[0143] Comparative Example 2

[0144] The specific embodiment is consistent with Example 1, the mass ratio between the slow-release particles and the oxidant carrier is changed to 1:5, specifically slow-release particles 1 g, peroxide urea 5 g.

[0145] Comparative Example 3

[0146] The specific embodiment is consistent with that of Example 1, the number average molecular weight of polyisobutylene succinimide is changed to 3000 Da, and the weight average molecular weight / number average molecular weight = 2.0.

[0147] Comparative Example 4

[0148] The specific embodiment is consistent with that of Example 1, the number average molecular weight of polyisobutylene succinimide is changed to 3000 Da, and the weight average molecular weight / number average molecular weight = 1.5.

[0149] Comparative Example 5

[0150] The specific embodiment is consistent with that of Example 1, the number average molecular weight of polyisobutylene succinimide is changed to 1000 Da, and the weight average molecular weight / number average molecular weight = 2.0.

[0151] Comparative Example 6

[0152] The specific embodiment is consistent with that of Example 1, the number average molecular weight of polyisobutylene succinimide is changed to 1000 Da, and the weight average molecular weight / number average molecular weight = 1.5.

[0153] Comparative Example 7

[0154] The specific embodiment is consistent with that of Example 1, the number average molecular weight of polyisobutylene succinimide is changed to 1000 Da, and the weight average molecular weight / number average molecular weight = 1.5.

[0155] Experimental Example 1: Dynamic packed column removal performance test

[0156] Purpose: To simulate the industrial waste gas treatment scene, and determine the real-time removal rate of the absorption liquid to polycyclic aromatic hydrocarbons (PAHs) and oil mist in asphalt smoke.

[0157] 1. Preparation of simulated waste gas:

[0158] 70# road asphalt is heated to 180±5℃, and nitrogen gas (flow rate 2L / min) is introduced to carry the flue gas;

[0159] Mineral oil (ISO VG 460) is atomized synchronously to generate oil mist, and after mixing, the composition of the waste gas is: asphalt smoke 200±20mg / m 3 , oil mist 50±5mg / m 3 , benzo[a]pyrene ≥5μg / m 3 .

[0160] 2. Absorption system setup:

[0161] The packed column (DN150x1200mm) is filled with Φ25mm ceramic rectangular saddle ring, and the liquid-gas ratio is set to 8L / m 3 .

[0162] Absorption liquid was prepared according to the formulation of Example 1, initial loading amount 20 L, circulation flow rate 400 L / h.

[0163] 3. Data acquisition

[0164] Sampling at the inlet / outlet of the tower every 24 h:

[0165] Asphalt fume: GB / T 16157 stationary source sampling + gravimetric method;

[0166] Oil mist: infrared spectrophotometry;

[0167] Benzene[a]pyrene: gas chromatography-mass spectrometry.

[0168] 4. Long-term operation monitoring

[0169] Continuous operation for 90 days, recording the pressure difference of the filler layer every 7 days (pressure difference sensor accuracy ±0.5 kPa);

[0170] Take the waste liquid to detect COD and PAHs residue on the 30th / 60th / 90th day.

[0171] The experimental results are shown in Tables 1-3.

[0172] Table 1: Asphalt fume removal rate

[0173]

[0174] Table 2: Oil mist removal rate

[0175]

[0176] Table 3: Benzene[a]pyrene removal rate

[0177]

[0178] Experimental Example 2: Verification of demulsification and oxidation efficiency

[0179] Objective: To quantify the oil-water separation capacity and slow-release oxidation effect of the absorption liquid. Steps:

[0180] 1. Demulsification rate test:

[0181] Prepare a simulated emulsion containing 30% mineral oil (oil droplet size 1-10 μm);

[0182] Take 200 mL of emulsion and add 500 mL of absorption liquid, stir at 60 rpm for 10 min;

[0183] After standing for 30 min, record the volume of the separated oil layer and calculate the demulsification rate:

[0184] The experimental results are shown in Table 4.​

[0185] Table 4: Results of demulsification rate detection

[0186]

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements.

Claims

1. An absorption liquid for absorbing bitumen fume and oil mist exhaust gas, characterized by comprising: made of the following raw materials in percentage by mass: polyethylene glycol dimethyl ether 60%-80%; demulsifier 5%-15%; dispersion polymerization inhibitor 3%-10%; oxidant carrier 1%-3%; slow-release particles 2%-9%; co-solvent 5%-12%; antifoaming agent 0.1%-1%; the slow-release particles are silica loaded with hydrogen peroxide; the demulsifier is any one or more of EO-PO block copolymer, fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether; the dispersion polymerization inhibitor is any one or more of sodium dodecyl benzene sulfonate, lignin sulfonate, polyisobutylene succinimide, polyvinylpyrrolidone or polyethylene glycol; the oxidant carrier is any one or more of urea peroxide or sodium percarbonate; the co-solvent is any one or more of diisooctyl cyclohexane dicarboxylate, ethylene glycol monobutyl ether, diethylene glycol butyl ether, isopropyl alcohol or dibutyl phthalate; the antifoaming agent is polysiloxane emulsion.

2. The absorption liquid for absorbing bitumen fume and oil mist exhaust gas according to claim 1, characterized by, the mass ratio between the slow-release particles and the oxidant carrier is (1-3):

1.

3. The absorption liquid for absorbing bitumen fume and oil mist exhaust gas according to claim 2, characterized by, the mass ratio between the slow-release particles and the oxidant carrier is 2:

1.

4. The absorption liquid for absorbing bitumen fume and oil mist exhaust gas according to claim 1, characterized by, the demulsifier is EO-PO block copolymer; the dispersion polymerization inhibitor is polyisobutylene succinimide; the oxidant carrier is urea peroxide; the co-solvent is diisooctyl cyclohexane dicarboxylate.

5. The absorption liquid for absorbing bitumen fume and oil mist exhaust gas according to claim 4, characterized by, the number average molecular weight of the polyisobutylene succinimide is 1300 Da-2500 Da; and the weight average molecular weight / number average molecular weight≥2.

0.

6. A method for preparing an absorption liquid for absorbing bitumen fume and oil mist exhaust gas according to any one of claims 1 to 5, characterized in that, comprising the following steps: S1, dipping silica in hydrogen peroxide, stirring, filtering and drying to obtain slow-release particles; S2, mixing the slow-release particles with oxidant carrier, adding anhydrous ethanol for ball milling, drying to obtain slow-release oxidant particles; S3, heating polyethylene glycol dimethyl ether, then adding co-solvent, demulsifier and dispersion polymerization inhibitor in sequence, stirring uniformly to a uniform transparent solution; S4, adding slow-release oxidant particles to the uniform transparent solution and dispersing at low speed; S5, cooling, adding antifoaming agent, mixing uniformly and filtering to obtain the product.

7. The method of claim 6, wherein the absorption liquid for absorbing asphalt fume and oil mist exhaust gas is prepared by adding 0.1 to 0.5 parts by weight of the surfactant to 100 parts by weight of the water. the volume concentration of hydrogen peroxide in the S1 step is 30%.

8. The method of claim 6, wherein the absorption liquid for absorbing asphalt fume and oil mist exhaust gas is prepared by adding 0.1 to 0.5 parts by weight of the surfactant to 100 parts by weight of the water. in the S1 step, stirring needs to be carried out at 60-65℃ for 2-3h.

9. Use of the absorbing liquid according to any one of claims 1-5 in absorbing asphalt fume and oil mist waste gas.

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