Production method of straight-run environment-friendly asphalt
By blending low-density and high-density naphthenic low-sulfur crude oils and frequently using vacuum distillation to produce straight-run environmentally friendly asphalt, the problem of high toxic and harmful polycyclic aromatic hydrocarbon content in asphalt has been solved, achieving improved environmental performance and meeting international safety standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2024-11-11
- Publication Date
- 2026-05-12
AI Technical Summary
Existing technologies cannot effectively reduce the content of toxic and harmful polycyclic aromatic hydrocarbons in asphalt, and cannot meet the environmental protection and medical safety requirements in environments in close contact with the human body, especially the stringent technical requirements in regions such as the European Union.
Low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil are blended in a certain proportion and then frequently distilled under reduced pressure to produce a residue oil fraction with an initial boiling point >460℃. This residue oil fraction is then used to prepare straight-run environmentally friendly asphalt products, while controlling the content of toxic and harmful aromatic hydrocarbons within a specific range.
It significantly reduces the content of toxic and harmful polycyclic aromatic hydrocarbons in asphalt, improves medical safety, meets international environmental protection and safety requirements, promotes the utilization of crude oil resources and economic benefits, and is suitable for fields that come into contact with the human body.
Smart Images
Figure CN122012131A_ABST
Abstract
Description
Technical fields:
[0001] This invention relates to the field of petrochemical technology, and in particular to a method for producing straight-run environmentally friendly asphalt. Background technology:
[0002] Asphalt contains trace amounts of benzopyrene and polycyclic aromatic hydrocarbons, which are carcinogenic. Because asphalt is mainly used for road paving in the transportation industry and does not come into direct contact with people, this issue has been overlooked. However, with increasing societal and environmental demands for environmental protection, the environmental safety performance of asphalt products is receiving more and more attention in many areas where they come into close contact with the human body. The EU REACH regulation and the German GS-MARK both set forth relevant technical requirements regarding the carcinogenicity of asphalt products.
[0003] With the development and application of asphalt technology, asphalt has been widely used in various industries and is inseparable from people's lives. We often come into close contact with products made primarily of asphalt, such as automotive interiors, fitness equipment, and black rubber products. Road construction companies also frequently come into contact with asphalt products in a hot-melt state. In the tire and rubber industry, asphalt has a long history of use as a dispersant and plasticizer. However, with increasingly stringent environmental and medical safety requirements in regions such as the EU, conventional asphalt can no longer meet application needs. Medical safety requirements have been placed on materials used in environments that come into contact with the human body, such as pipeline corrosion protection, water blocking and seepage prevention, automotive interiors, sound insulation and damping, fitness facilities, and children's play facilities. Currently, my country has not issued relevant regulations for such products, but exported products must comply with strict technical requirements and undergo designated safety and environmental performance tests.
[0004] The environmental performance of asphalt is closely related to the type of crude oil and the production process. The key to producing environmentally friendly asphalt products lies in the choice of process and specific parameters to ensure the removal of carcinogens and in selecting suitable crude oil and matching production processes to reduce the residue of light components. Summary of the Invention:
[0005] The technical problem to be solved by the present invention is to provide a method for producing straight-run environmentally friendly asphalt, which effectively reduces the content of toxic and harmful polycyclic aromatic hydrocarbons in asphalt and significantly improves the environmental performance of asphalt products.
[0006] The technical solution adopted in this invention is: a method for producing straight-run environmentally friendly asphalt, comprising the following steps:
[0007] Step 1: Blend low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil in a certain proportion to form a mixed crude oil, wherein the low-density naphthenic low-sulfur crude oil accounts for 60% to 80% of the mass percentage of the mixed crude oil, and the high-density naphthenic low-sulfur crude oil accounts for 40% to 20% of the mass percentage of the mixed crude oil.
[0008] Step 2: After blending, the mixed crude oil is frequently subjected to vacuum distillation to obtain a residue fraction with an initial boiling point >460℃, which is a straight-run environmentally friendly asphalt product with toxic and harmful aromatics that meets the requirements.
[0009] Furthermore, the properties of the low-density naphthenic low-sulfur crude oil are as follows: density is 940–970 kg / m³. 3 Naphthenic crude oil with sulfur content <5000 mg / kg, total content of gum and asphaltenes >20%, acid value 4-6 mg / g, wax content <3%, and API gravity 15-20.
[0010] Furthermore, the high-density naphthenic low-sulfur crude oil has the following properties: density of 970–990 kg / m³. 3 Naphthenic crude oil with a sulfur content of <4000 mg / kg, a total content of gum and asphaltenes >20%, an acid value of 4-6 mg / g, a wax content of <3%, and an API gravity of 10-16.
[0011] Furthermore, the straight-run environmentally friendly asphalt product is an asphalt product with a penetration of 10-30 dmm, a softening point of 50-70℃, a flash point of >280℃, and a film drying oven test (mass change) of <±0.1%.
[0012] Furthermore, the toxic and harmful aromatic hydrocarbons in the straight-run environmentally friendly asphalt product include eight harmful polycyclic aromatic hydrocarbons: benzo[a]pyrene, benzo[e]pyrene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, benzo[a]anthracene, and so on. Dibenzo[a,h]anthracene; including fifteen toxic and harmful polycyclic aromatic hydrocarbons: benzo[a]pyrene, benzo[e]pyrene, benzo[b]fluoranthracene, benzo[j]fluoranthracene, benzo[k]fluoranthracene, benzo[a]anthracene, Dibenzo[a,h]anthracene, anthracene, benzo[g,h,i]perylene, fluoranthracene, indene[1,2,3-c,d]pyrene, naphthalene, phenanthrene, pyrene.
[0013] Furthermore, the total content of eight toxic and harmful polycyclic aromatic hydrocarbons in the straight-run environmentally friendly asphalt product is <20mg / kg, the content of benzo[a]pyrene is <2mg / kg, and the total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons is <30mg / kg.
[0014] The beneficial effects of this invention are:
[0015] (1) Effectively reduce the content of toxic and harmful polycyclic aromatic hydrocarbons in asphalt: Through the method of the present invention, the total content of eight toxic and harmful polycyclic aromatic hydrocarbons in the straight-run environmentally friendly asphalt product is <20mg / kg, the content of benzo[a]pyrene is <2mg / kg, and the total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons is <30mg / kg, which significantly improves the environmental performance of asphalt products.
[0016] (2) Improve the medical safety of asphalt products: The straight-run environmentally friendly asphalt products produced by this invention have higher medical safety in areas that come into close contact with people, such as car interiors and fitness equipment, and meet the strict requirements of domestic and foreign countries for the environmental safety performance of asphalt products.
[0017] (3) Optimize the utilization of crude oil resources: By blending low-density naphthenic low-sulfur crude oil with high-density naphthenic low-sulfur crude oil in a certain proportion, the rational utilization of crude oil resources is realized, and the economic benefits of asphalt production are improved.
[0018] (4) Meets international market access requirements: The straight-run environmentally friendly asphalt produced by this invention meets the strict environmental and medical safety requirements of the EU and other regions, which is conducive to the export of my country's asphalt products and enhances international market competitiveness.
[0019] (5) Promote the development of the environmental protection industry: The implementation of this invention will help promote the development of my country's petrochemical industry towards environmental protection, safety and efficiency, and contribute to my country's environmental protection industry.
[0020] (6) Low-sulfur crude oil is used to process environmentally friendly asphalt products through vacuum deep drawing process. During the production process, the sulfur content in crude oil is controlled, which reduces the amount of hydrogen sulfide, mercaptan and disulfide generated after RS-R' fracture in crude oil during vacuum deep drawing, thus reducing the environmental pollution of the equipment. Attached image description:
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0022] Figure 1 This is a schematic diagram of the present invention. Detailed implementation method:
[0023] Example 1
[0024] Low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil were blended in a ratio of 60%:40%, as shown in Table 1. After frequent vacuum distillation, a residue fraction with an initial boiling point >460℃ was obtained. This yielded an environmentally friendly asphalt product with a penetration of 10–30 dmm, a softening point of 50–70℃, a flash point >280℃, a film drying oven test (mass change) of <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20 mg / kg, a benzo[a]pyrene content of <2 mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons of <30 mg / kg. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 2.
[0025] Example 2
[0026] Low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil were blended in a ratio of 70%:30%, as shown in Table 1. After frequent vacuum distillation, a residue fraction with an initial boiling point >460℃ was obtained. This yielded an environmentally friendly asphalt product with a penetration of 10–30 dmm, a softening point of 50–70℃, a flash point >280℃, a film drying oven test (mass change) of <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20 mg / kg, a benzo[a]pyrene content of <2 mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons of <30 mg / kg. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 2.
[0027] Example 3
[0028] Low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil were blended in a ratio of 80%:20%, as shown in Table 1. After frequent vacuum distillation, a residue fraction with an initial boiling point >460℃ was obtained. This yielded an environmentally friendly asphalt product with a penetration of 10–30 dmm, a softening point of 50–70℃, a flash point >280℃, a film drying oven test (mass change) of <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20 mg / kg, a benzo[a]pyrene content of <2 mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons of <30 mg / kg. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 2.
[0029] Comparative Example 1
[0030] Low-density naphthenic low-sulfur crude oil was blended with high-density naphthenic low-sulfur crude oil. The crude oil properties are shown in Table 1. The ratio was 60%:40%. After frequent vacuum distillation, a residue fraction with an initial boiling point >450℃ was obtained. However, an environmentally friendly asphalt product with a penetration of 10-30 dmm, a softening point of 50-70℃, a flash point >280℃, a film drying oven test (mass change) <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20mg / kg, a benzo[a]pyrene content <2mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons <30mg / kg was not produced. Among them, the benzo[a]pyrene content was 2.2mg / kg, which is greater than 2mg / kg, and the total content of the fifteen aromatic hydrocarbons was 30.3mg / kg, which is greater than 30mg / kg. This does not meet the technical requirements. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 3.
[0031] Comparative Example 2
[0032] Low-density naphthenic low-sulfur crude oil was blended with high-density naphthenic low-sulfur crude oil in a ratio of 70%:30%, as shown in Table 1. After frequent vacuum distillation, a residue fraction with an initial boiling point >450℃ was obtained. However, an environmentally friendly asphalt product with a penetration of 10-30 dmm, a softening point of 50-70℃, a flash point >280℃, a film drying oven test (mass change) <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20 mg / kg, a benzo[a]pyrene content <2 mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons <30 mg / kg was not produced. Among these, the penetration of 31 dmm was greater than 30 dmm and the benzo[a]pyrene content of 2.1 mg / kg was greater than 2 mg / kg, which did not meet the technical requirements. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 4.
[0033] Comparative Example 3
[0034] Low-density naphthenic low-sulfur crude oil was blended with high-density naphthenic low-sulfur crude oil. The crude oil properties are shown in Table 1. The ratio was 80%:20%. After frequent vacuum distillation, a residue fraction with an initial boiling point >450℃ was obtained. However, an environmentally friendly asphalt product with a penetration of 10-30 dmm, a softening point of 50-70℃, a flash point >280℃, a film drying oven test (mass change) <±0.1%, a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20mg / kg, a benzo[a]pyrene content <2mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons <30mg / kg was not produced. Among them, the penetration of 33 dmm was greater than 30 dmm, which did not meet the technical requirements. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 5.
[0035] Example 4
[0036] Low-density naphthenic low-sulfur crude oil was blended with high-density naphthenic low-sulfur crude oil. The crude oil properties are shown in Table 1. The ratio was 70%:30%. After frequent vacuum distillation, a residue oil fraction with an initial boiling point >470℃ was obtained. An environmentally friendly asphalt product was produced with a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20mg / kg, a benzo[a]pyrene content <2mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons <30mg / kg. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 4.
[0037] Example 5
[0038] Low-density naphthenic low-sulfur crude oil was blended with high-density naphthenic low-sulfur crude oil. The crude oil properties are shown in Table 1. The ratio was 80%:20%. After frequent vacuum distillation, a residue oil fraction with an initial boiling point >470℃ was obtained. An environmentally friendly asphalt product was produced with a total content of eight toxic and harmful polycyclic aromatic hydrocarbons <20mg / kg, a benzo[a]pyrene content <2mg / kg, and a total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons <30mg / kg. Various conventional properties and the content of toxic and harmful polycyclic aromatic hydrocarbons are shown in Table 5.
[0039] Table 1. Crude Oil Properties
[0040]
[0041]
[0042] Table 2 shows the properties of the products obtained after vacuum distillation of the two crude oils in Examples 1-3 at different blending ratios.
[0043]
[0044]
[0045] Table 3 Properties of the products obtained from vacuum distillation of Example 1 and Comparative Example 1 under different process conditions
[0046]
[0047] Table 4. Properties of the products obtained from vacuum distillation of Examples 2, 4 and Comparative Example 2 under different process conditions.
[0048]
[0049] Table 5. Properties of the products obtained from Examples 3, 5 and Comparative Example 3 after vacuum distillation under different process conditions.
[0050]
[0051] As can be seen from Examples 1-3, the environmental performance improves significantly with increasing blending ratio of low-density naphthenic low-sulfur crude oil. When the blending ratio of high-density naphthenic low-sulfur crude oil is 40%, its benzo(a)pyrene content has increased to 1.8 mg / kg. If the ratio is further increased, it will exceed the technical requirement of 2.0 mg / kg. Examples 1-5 and Comparative Examples 1-3 show that under different raw material blending ratios, the deeper the cutting depth, the greater the improvement in environmental performance; conversely, the environmental performance decreases significantly. Comparative Example 1 has benzo(a)pyrene at 2.2 mg / kg and the total of fifteen aromatics at 30.3 mg / kg, while Comparative Example 2 has benzo(a)pyrene at 2.1 mg / kg, exceeding the technical requirements. The higher the blending ratio of low-density naphthenic low-sulfur crude oil, the greater the penetration of the residue oil. Comparative Example 2 has a penetration of 31, and Comparative Example 3 has a penetration of 33, exceeding the technical requirements. Conversely, the higher the blending ratio of high-density naphthenic low-sulfur crude oil, the lower the residue penetration. Therefore, by setting the process conditions to a blending ratio of 60%–80% low-density naphthenic low-sulfur crude oil, 40%–20% high-density naphthenic low-sulfur crude oil, and frequent vacuum distillation of the blended crude oil, the residue fraction with an initial boiling point >460℃ can produce a straight-run environmentally friendly asphalt product that meets the requirements.
[0052] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.
Claims
1. A method for producing straight-run environmentally friendly asphalt, characterized in that: Includes the following steps: Step 1: Blend low-density naphthenic low-sulfur crude oil and high-density naphthenic low-sulfur crude oil in a certain proportion to form a mixed crude oil, wherein the low-density naphthenic low-sulfur crude oil accounts for 60% to 80% of the mass percentage of the mixed crude oil, and the high-density naphthenic low-sulfur crude oil accounts for 40% to 20% of the mass percentage of the mixed crude oil. Step 2: After blending, the mixed crude oil is frequently subjected to vacuum distillation to obtain a residue fraction with an initial boiling point >460℃, which is a straight-run environmentally friendly asphalt product with toxic and harmful aromatics that meets the requirements.
2. The method for producing straight-run environmentally friendly asphalt according to claim 1, characterized in that: The properties of the low-density naphthenic low-sulfur crude oil are: density 940–970 kg / m³ 3 Naphthenic crude oil with sulfur content <5000 mg / kg, total content of gum and asphaltenes >20%, acid value 4-6 mg / g, wax content <3%, and API gravity 15-20.
3. The method for producing straight-run environmentally friendly asphalt according to claim 1, characterized in that: The high-density naphthenic low-sulfur crude oil has the following properties: density of 970–990 kg / m³. 3 Naphthenic crude oil with a sulfur content of <4000 mg / kg, a total content of gum and asphaltenes >20%, an acid value of 4-6 mg / g, a wax content of <3%, and an API gravity of 10-16.
4. The method for producing straight-run environmentally friendly asphalt according to claim 1, characterized in that: The straight-run environmentally friendly asphalt product is an asphalt product with a penetration of 10-30 dmm, a softening point of 50-70℃, a flash point of >280℃, and a film drying oven test (mass change) of <±0.1%.
5. The method for producing straight-run environmentally friendly asphalt according to claim 1, characterized in that: The toxic and harmful aromatic hydrocarbons in the straight-run environmentally friendly asphalt product include eight harmful polycyclic aromatic hydrocarbons: benzo[a]pyrene, benzo[e]pyrene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, benzo[a]anthracene, and benzo[a]anthracene. Dibenzo[a,h]anthracene; including fifteen toxic and harmful polycyclic aromatic hydrocarbons: benzo[a]pyrene, benzo[e]pyrene, benzo[b]fluoranthracene, benzo[j]fluoranthracene, benzo[k]fluoranthracene, benzo[a]anthracene, Dibenzo[a,h]anthracene, anthracene, benzo[g,h,i]perylene, fluoranthracene, indene[1,2,3-c,d]pyrene, naphthalene, phenanthrene, pyrene.
6. The method for producing straight-run environmentally friendly asphalt according to claim 5, characterized in that: The total content of eight toxic and harmful polycyclic aromatic hydrocarbons in the straight-run environmentally friendly asphalt product is <20mg / kg, the content of benzo[a]pyrene is <2mg / kg, and the total content of fifteen toxic and harmful polycyclic aromatic hydrocarbons is <30mg / kg.