Environment-friendly odor removing agent for asphalt odor as well as preparation method and application of environment-friendly odor removing agent

Abstract

The invention relates to the field of asphalt odor removal. The invention provides an environment-friendly odor removing agent for asphalt odor. The environment-friendly odor removing agent is mainly prepared from the following raw materials in parts by weight: 50-60 parts of a porous adsorbent, 20-30 parts of a complexing agent, 11-20 parts of a complexing accelerant, 10-15 parts of a sulfide absorbent, 1-5 parts of an aromatic, 2-5 parts of a solubilizer and 3-5 parts of a surfactant. The invention also provides a preparation method of the environment-friendly odor removing agent for the asphalt odor. The preparation method comprises the following steps: step 1, washing and drying fresh bagasse; 2, bagasse porous carbon is prepared; and step 3, adding a complexing agent, a complexing accelerant, a sulfide absorbent, an aromatic, a solubilizer and a surfactant in proportion, stirring, adding bagasse porous carbon in proportion, and continuously stirring to obtain the environment-friendly odor removing agent for asphalt odor. The invention further provides application of the environment-friendly odor removing agent for the asphalt odor. According to the present invention, the novel odor removing agent product is developed, such that the content of the odor substance in the asphalt flue gas is reduced;

Description

Technical Field

[0001] This invention relates to the field of asphalt odor neutralization, and more particularly to an environmentally friendly asphalt odor neutralizer, its preparation method, and its application. Background Technology

[0002] In recent years, my country's expressways have been developing rapidly, and asphalt pavement, as a widely used expressway pavement material, plays a dominant role in expressway construction. Currently, asphalt pavement accounts for over 90% of the world's highway engineering. Asphalt is a dark brown, complex mixture, mainly composed of organic compounds such as carbocyclic hydrocarbons and their derivatives of varying molecular weights. Small-molecule organic compounds in asphalt readily volatilize under heating conditions, forming asphalt fumes with a pungent odor. Especially during high-temperature heating of asphalt, carcinogens in the asphalt volatilize along with the fumes, further intensifying the odor. In particular, the polycyclic aromatic hydrocarbons (PAHs) in asphalt, including toxic and harmful substances such as benzene, toluene, and xylene, as well as carcinogens such as polycyclic aromatic hydrocarbons, possess significant carcinogenic, teratogenic, and mutagenic properties, posing a great threat to public health.

[0003] On the other hand, the odor originates from various modifiers added to improve the performance of asphalt, especially waste rubber powder and waste viscoelastic polymers. These modifiers often require the addition of large amounts of vulcanizing agents and accelerators during initial production. These substances, or their decomposition products, often contain sulfur and nitrogen heterocyclic structures. Road asphalt with these modifiers added will generate large amounts of foul-smelling exhaust gases during production or construction, severely polluting the environment and endangering the health of construction workers and nearby residents.

[0004] As global environmental problems worsen, public awareness of environmental protection is growing stronger. The demand for removing the pungent odor of asphalt is also increasing. Conventional methods are not applicable. For example, using high-voltage pulsed corona discharge at normal temperature and pressure to obtain non-equilibrium plasma to oxidize and degrade corresponding molecules in asphalt, converting toxic substances into harmless gases before emission, is expensive to implement, cumbersome to operate, inflexible, and insufficient for treating high-concentration flue gas. Another method is high-temperature incineration to convert combustible materials into harmless substances, but temperature and time must be controlled to avoid secondary pollution. Another method is using a high-voltage electrostatic field to capture particulate matter in flue gas, suitable for capturing sticky substances such as tar, but with low efficiency for dry electrostatic capture. Yet another method is using activated carbon or other adsorbents to physically adsorb harmful components; this is simple to operate and has high purification efficiency, but the system resistance is high and the footprint is large. Finally, methods involve reacting or dissolving pollutants with absorbents to achieve purification, but this may produce secondary pollution.

[0005] Therefore, how to efficiently and conveniently remove odorous substances from asphalt matrix is ​​a technical problem that needs to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide an environmentally friendly deodorizing agent for asphalt odor, its preparation method, and its application. This invention utilizes a synergistic process of chemical reaction and physical adsorption to suppress odor generation during asphalt processing and reduce the content of odorous substances in asphalt fumes.

[0007] To address the above problems, the present invention provides the following technical solution: An environmentally friendly deodorizing agent for asphalt odor is mainly prepared from the following raw materials in parts by weight: 50-60 parts porous adsorbent, 20-30 parts complexing agent, 11-20 parts complexing accelerator, 10-15 parts sulfide absorbent, 1-5 parts fragrance agent, 2-5 parts solubilizer, and 3-5 parts surfactant. Preferably, the environmentally friendly deodorizing agent for asphalt odor is mainly prepared from the following raw materials in parts by weight: 50-60 parts porous adsorbent, 20-25 parts complexing agent, 15 parts complexing accelerator, 15 parts sulfide absorbent, 3 parts fragrance agent, 5 parts solubilizer, and 3 parts surfactant.

[0008] The aforementioned asphalt odor-eliminating and environmentally friendly deodorizing agent uses a porous adsorbent that is one or a mixture of sugarcane bagasse porous carbon, porous silicon carbide, and molecular sieve ZSM-5. Preferably, the porous adsorbent is sugarcane bagasse porous carbon. This is because sugarcane bagasse porous carbon has a porous and fluffy surface, a well-developed pore structure, and excellent adsorption properties; the large number of pores significantly increases the specific surface area and adsorption capacity of the material.

[0009] The asphalt odor-eliminating and environmentally friendly deodorizing agent described above, wherein the complexing agent is one or more of the following: 2-hydroxybenzaldehyde acridine, hydrolyzed polymaleic anhydride, polyhydroxyacrylic acid, maleic acid-acrylic acid copolymer, and polyacrylamide. Preferably, the complexing agent is 2-hydroxybenzaldehyde acridine.

[0010] The asphalt odor-eliminating and environmentally friendly deodorizing agent described above uses a complexing accelerator that is one or a mixture of imidazole, 2-methylimidazolium, and aluminum isophthalate hydroxide. Preferably, the complexing accelerator is a mixture of 2-methylimidazolium and aluminum isophthalate hydroxide, wherein the mass ratio of 2-methylimidazolium to aluminum isophthalate hydroxide is 1:2, and the two work synergistically to promote the complexation of 2-hydroxybenzaldehyde azine.

[0011] The asphalt odor-eliminating and environmentally friendly odor neutralizer described above uses a sulfide absorbent that is one or a mixture of triazine derivatives, citric acid, lysine, arginine, and histidine. Preferably, the sulfide absorbent is a triazine derivative, specifically mesitylezimine, and its reaction temperature is around 100°C, similar to the asphalt processing and modification temperature.

[0012] The environmentally friendly deodorizing agent for asphalt odor as described above, wherein the fragrance is one or a mixture of 2-phenylacetaldehyde, methyl cis-jasmonic acid, β-phenylethanol, and nocaketone. Preferably, the fragrance is 2-phenylacetaldehyde, which has a sweet fruity aroma and can mask the malodorous odor produced during asphalt processing to a certain extent.

[0013] The asphalt odor-reducing and environmentally friendly deodorizing agent described above uses a solubilizer that is one or more of hydrogenated castor oil polyoxyethylene ether, xylene ether, glyceryl stearate, fatty alcohol ether phosphate, and urea oxytetracycline ester. Preferably, the solubilizer is hydrogenated castor oil polyoxyethylene ether, which has low dosage, high efficiency, and large solubilizing capacity.

[0014] The asphalt odor-neutralizing environmentally friendly deodorizer described above uses a surfactant that is one or a mixture of castor oil phosphate, sodium lauryl sulfate, sodium dodecylbenzene sulfonate, and fatty acid monoglycerides. Preferably, the surfactant is castor oil phosphate, which has low surface tension, good emulsification, antistatic properties, is non-toxic, non-irritating, and electrolyte resistant.

[0015] Based on the same inventive concept, this invention provides a method for preparing the asphalt odor-neutralizing environmentally friendly odor neutralizer as described above, comprising the following steps: Step 1: Take fresh sugarcane bagasse and rinse it repeatedly with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in a constant temperature oven at 80℃~100℃ for 12~24 hours to dry. Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. The temperature inside the furnace is controlled at 600-700℃ and the carbonization time is 24-48h. Then, seal the furnace and keep it warm for 24-48h. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon. Step 3: Add complexing agent, complexing accelerator, sulfide absorbent, fragrance, solubilizer, and surfactant in proportion, stir for 20-30 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20-30 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0016] Based on the same inventive concept, this invention also provides the application of the asphalt odor-reducing environmentally friendly deodorizer as described above or the asphalt odor-reducing environmentally friendly deodorizer prepared by the preparation method described above in suppressing the generation of odor during asphalt processing and reducing the content of odorous substances in asphalt fumes.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a triazine derivative as an environmentally friendly deodorizing agent for asphalt odor. This derivative can chemically react with heteroatoms such as sulfur and nitrogen in asphalt, transforming them into high-boiling-point compounds that inhibit the volatilization of harmful gases, especially showing a significant inhibitory effect on the odor of rubber asphalt. The complexing agent and complexing accelerator work synergistically to reduce the volatilization of harmful gases in asphalt, thereby reducing odors generated during the production of modified asphalt, asphalt mixtures, paving, and waterproof membranes.

[0018] 2. The present invention provides a method for preparing an environmentally friendly deodorizing agent for asphalt odor, which can remove odorous and carcinogenic gases such as sulfides, polycyclic aromatic hydrocarbons, dibenzothiophene, and carbazole from asphalt without the need for large-scale equipment. The removal efficiency is high and stable, and the operation is simple and low-cost.

[0019] 3. The environmentally friendly deodorizing agent for asphalt provided by this invention has a very obvious purification effect on sulfides in asphalt, with an odor level of less than 5, and minimal interference to construction operators; after 0 days of storage, the sulfide content drops from 414 ppm in the base asphalt to about 100 ppm, and as the storage time increases, the sulfide content remains at a low level and gradually decreases, with a long-lasting and stable purification effect. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0023] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0024] In the following examples, triazine was purchased from Dongying Jiuneng Petroleum Technology Co., Ltd., brand name JNLQ-1; 2-hydroxybenzaldehyde azine was purchased from Hubei Xingyan New Material Technology Co., Ltd.; 2-methylimidazole was purchased from Nantong Runfeng Petrochemical Co., Ltd.; aluminum isophthalic acid hydroxide was purchased from Shanghai Huayuan Century Trading Co., Ltd.; 2-phenylacetaldehyde was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; hydrogenated castor oil polyoxyethylene ether, fatty acid monoglycerides, fatty alcohol ether phosphates and castor oil phosphates were purchased from Jiangsu Haian Petrochemical Plant; methyl cis-jasmonic acid was purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd.; porous silicon carbide was purchased from Hangzhou Jikang New Material Co., Ltd.; and molecular sieve ZSM-5 was purchased from Shandong Jiushuo Environmental Protection Technology Co., Ltd.

[0025] Example 1: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor and its preparation method, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0026] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0027] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0028] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalic acid hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0029] Example 2: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor and its preparation method, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of fatty alcohol ether phosphate, and 3 parts of castor oil phosphate.

[0030] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0031] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0032] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalate hydroxide, triazine, 2-phenylacetaldehyde, fatty alcohol ether phosphate, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0033] Example 3: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor and its preparation method, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of methyl cis-jasmonic acid, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0034] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0035] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0036] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalate hydroxide, triazine, methyl cis-jasmonic acid, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0037] Example 4: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor and its preparation method, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of fatty acid monoglycerides.

[0038] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0039] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0040] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalic acid hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and fatty acid monoglycerides in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0041] Example 5: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is mainly prepared from the following components in parts by weight: 60 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0042] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0043] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0044] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalic acid hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0045] Example 6: This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 20 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0046] This embodiment provides an environmentally friendly deodorizing agent for asphalt odor, which is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0047] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0048] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalic acid hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

[0049] Comparative Example 1: This comparative example provides an asphalt deodorizing agent, which is mainly prepared from the following components in parts by weight: 50 parts of porous carbon from sugarcane bagasse, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0050] The asphalt odor neutralizer provided in this comparative example is prepared by the following method, specifically including the following steps: Step 1: Take fresh sugarcane bagasse and rinse it twice with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in an 80°C constant temperature oven to dry for 12 hours.

[0051] Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. Control the temperature inside the furnace at 650℃ and carbonize for 24 hours. Then seal the furnace and keep it warm for 24 hours. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon.

[0052] Step 3: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalic acid hydroxide, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt environmentally friendly deodorizing agent.

[0053] Comparative Example 2: This comparative example provides an asphalt deodorizing agent, which is mainly prepared from the following components in parts by weight: 50 parts of molecular sieve ZSM-5, 25 parts of 2-hydroxybenzaldehyde azine, 5 parts of 2-methylimidazole, 10 parts of aluminum hydroxide isophthalic acid, 15 parts of triazine, 3 parts of 2-phenylacetaldehyde, 5 parts of hydrogenated castor oil polyoxyethylene ether, and 3 parts of castor oil phosphate.

[0054] The asphalt deodorizing agent provided in this comparative example is prepared by the following method, specifically including the following steps: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalate hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add molecular sieve ZSM-5 in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain asphalt environmentally friendly deodorizing agent.

[0055] Comparative Example 3: This comparative example provides an asphalt deodorizing agent and its preparation method, which is mainly prepared from the following components in parts by weight: 50 parts porous silicon carbide, 25 parts 2-hydroxybenzaldehyde azine, 5 parts 2-methylimidazole, 10 parts aluminum hydroxide isophthalic acid, 15 parts triazine, 3 parts 2-phenylacetaldehyde, 5 parts hydrogenated castor oil polyoxyethylene ether, and 3 parts castor oil phosphate.

[0056] The asphalt deodorizing agent provided in this comparative example is prepared by the following method, specifically including the following steps: Add 2-hydroxybenzaldehyde azine, 2-methylimidazole, aluminum isophthalate hydroxide, triazine, 2-phenylacetaldehyde, hydrogenated castor oil polyoxyethylene ether, and castor oil phosphate in proportion, stir for 20 minutes at a stirring speed of 100 rpm, add porous silicon carbide in proportion, keep the stirring speed unchanged, and continue stirring for 20 minutes to obtain an asphalt environmentally friendly deodorizing agent.

[0057] To verify the odor-neutralizing effect of the asphalt odor-neutralizing agent of the present invention, odor-neutralizing asphalt was prepared using Qilu Petrochemical No. 70 base asphalt. The asphalt environmentally friendly odor-neutralizing agent of Examples 1-6 and Comparative Examples 1-3 was added at 0.08 wt% of the asphalt mass. The base asphalt, Examples 1-6 and Comparative Examples 1-3 were thermally stored at 130°C for 0 days, 7 days and 30 days respectively. Then, an equal mass of the asphalt samples after the above storage was completed was transferred to a sealed container and flue gas enrichment was carried out at 180°C for 4 hours. After enrichment, the gas in the sealed container was taken and the sulfide content in the gas was tested by gas chromatography.

[0058] Simultaneously, an odor level evaluation is conducted as follows: During the evaluation, the evaluator brings their nose close to the edge of the freshly prepared modified asphalt container, with the edge of the container between the nose and lips, and the nose approximately 2-3 cm from the container opening. Inhale normally (at a moderate pace). The odor evaluation criteria are divided into 1-6 levels. If a situation occurs between two evaluation levels, a half-level or more detailed grading is allowed, as follows: Level 1: No odor; Level 2: Slight odor, but no interfering odor; Level 3: Obvious odor, but no interfering odor; Level 4: Interfering odor; Level 5: Strongly interfering odor; Level 6: Unbearable odor.

[0059] The gas chromatography sulfide test data are shown in Table 1.

[0060] Table 1 Gas Chromatography Sulfide Test Data

[0061] As shown in Table 1, Examples 1-6 have a significant purification effect on sulfides in asphalt, with an odor level below 5, minimizing interference with construction workers. After 0 days of storage, the sulfide content decreased from 414 ppm in the base asphalt to approximately 100 ppm, a purification effect far greater than the 261-294 ppm in Comparative Examples 1-3. Furthermore, with prolonged storage time, the sulfide content remained at a low level and gradually decreased; for example, after 7 days and 30 days, the sulfide content remained below 110 ppm, demonstrating a long-lasting and stable purification effect.

[0062] Comparative Example 1 demonstrates the indispensable role of triazine derivatives. Even without them, after 0 days of storage, the sulfide content was only 294 ppm, significantly higher than in Example 1, and the odor rating was 5.5. This indicates that at approximately 100°C, triazine derivatives react with sulfides to form stable water-soluble compounds, thereby reducing the sulfide concentration.

[0063] Comparative Example 2 shows that after the self-made bagasse porous carbon was replaced by molecular sieve ZSM-5, the purification effect after 0 days of storage resulted in a sulfide content of 261 ppm, which is 166% higher than that of Example 1. Comparative Example 3 shows that after the self-made bagasse porous carbon was replaced by porous silicon carbide, the purification effect after 0 days of storage resulted in a sulfide content of 290 ppm, which is 196% higher than that of Example 1. This indicates that the adsorption effect of the self-made bagasse porous carbon is superior to that of commercially available common adsorption materials such as porous silicon carbide and molecular sieve ZSM-5.

[0064] It should be noted that the specific embodiments are merely representative examples of the present invention, and the technical solution of the present invention is obviously not limited to the above embodiments, and there can be many variations. Those skilled in the art who obtain the present invention based on its explicit disclosure or without objection from the written description should consider it to be within the scope of protection of this patent.

Claims

1. An environmentally friendly deodorizing agent for asphalt odor, characterized in that, It is mainly prepared from the following raw materials in parts by weight: 50-60 parts of porous adsorbent, 20-30 parts of complexing agent, 11-20 parts of complexing promoter, 10-15 parts of sulfide absorbent, 1-5 parts of fragrance agent, 2-5 parts of solubilizer, and 3-5 parts of surfactant.

2. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The porous adsorbent is one or more of the following: bagasse porous carbon, porous silicon carbide, and molecular sieve ZSM-5.

3. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The porous adsorbent is bagasse porous carbon.

4. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The complexing agent is one or more of 2-hydroxybenzaldehyde azine, hydrolyzed polymaleic anhydride, polyhydroxyacrylic acid, maleic acid-acrylic acid copolymer, and polyacrylamide.

5. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The complexation promoter is one or a mixture of imidazole, 2-methylimidazolium, and aluminum hydroxide isophthalate.

6. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The sulfide absorbent is one or a mixture of triazine derivatives, citric acid, lysine, arginine, and histidine.

7. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The fragrance is one or a mixture of 2-phenylacetaldehyde, methyl cis-jasmonic acid, β-phenylethanol, and nocaketone.

8. The asphalt odor-reducing and environmentally friendly odor neutralizer according to claim 1, characterized in that, The solubilizer is one or a mixture of hydrogenated castor oil polyoxyethylene ether, xylene ether, glyceryl stearate, fatty alcohol ether phosphate, urea, and mycin ester.

9. A method for preparing an asphalt odor-neutralizing environmentally friendly odor neutralizer as described in claim 3, characterized in that, Includes the following steps: Step 1: Take fresh sugarcane bagasse and rinse it repeatedly with tap water and ethanol to remove impurities. Then place the washed sugarcane bagasse in an iron pan and put it in a constant temperature oven at 80℃~100℃ for 12~24 hours to dry. Step 2: Place the dried sugarcane bagasse into a carbonization furnace filled with nitrogen. The temperature inside the furnace is controlled at 600-700℃ and the carbonization time is 24-48h. Then, seal the furnace and keep it warm for 24-48h. Wash with deionized water and ethanol, filter and dry to obtain porous sugarcane bagasse carbon. Step 3: Add complexing agent, complexing accelerator, sulfide absorbent, fragrance, solubilizer, and surfactant in proportion, stir for 20-30 minutes at a stirring speed of 100-200 rpm, add bagasse porous carbon in proportion, keep the stirring speed unchanged, and continue stirring for 20-30 minutes to obtain asphalt odor-reducing environmentally friendly odor neutralizer.

10. The application of the asphalt odor-reducing environmentally friendly deodorizer as described in claims 1 to 8 or the asphalt odor-reducing environmentally friendly deodorizer prepared by the preparation method as described in claim 9 in suppressing the generation of odor during asphalt processing and reducing the content of odorous substances in asphalt fumes.

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