CN113969183B - Combined asphalt and preparation method thereof - Google Patents
Combined asphalt and preparation method thereof Download PDFInfo
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- CN113969183B CN113969183B CN202111258970.8A CN202111258970A CN113969183B CN 113969183 B CN113969183 B CN 113969183B CN 202111258970 A CN202111258970 A CN 202111258970A CN 113969183 B CN113969183 B CN 113969183B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
- C10G53/04—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one extraction step
Abstract
The invention discloses combined asphalt and a preparation method thereof, and belongs to the technical field of oil refining chemical products. The invention discloses combined asphalt which comprises the following components in parts by mass: 82-94 parts of vacuum residuum, 4-12 parts of heavy deasphalted oil and 2-6 parts of light deasphalted oil. The invention mixes the mixed oil of heavy deasphalted oil and light deasphalted oil with vacuum residuum to prepare the combined asphalt, which solves the problem that asphalt products produced by adopting traditional petroleum refining raw materials, formulas and processes in China can not reach the quality index of Australian C-50 asphalt. The raw materials of the combined asphalt are easy to obtain, the production process is simple, and the combined asphalt is suitable for industrial production.
Description
Technical Field
The invention relates to combined asphalt and a preparation method thereof, and belongs to the technical field of oil refining chemical products.
Background
In recent years, with the increasing petroleum refining capability of domestic refineries, the domestic asphalt productivity is rapidly increased, and the competition, particularly the homogenization competition, of the current domestic asphalt product market is very strong. In order to seek higher profits and sales, current domestic refiners wish to produce bitumen products meeting foreign standards. However, the foreign asphalt quality index has a larger difference from the national asphalt quality index, and the asphalt product produced by adopting the traditional petroleum refining raw materials, formulas and processes is difficult to reach the foreign asphalt quality standard requirement.
For example, although the imported demand of asphalt products in Australia reaches millions of tons every year, the asphalt products produced by traditional petroleum refining raw materials and production process formulas in China always mainly meet domestic asphalt product standards, and cannot meet the asphalt quality index requirements in Australia, so that the produced asphalt products cannot be exported to Australia, and white is lost as an important asphalt export market. Because the asphalt specification in China takes the penetration index at 25 ℃ as the grading basis of the asphalt grade, and the Australian asphalt specification takes the dynamic viscosity at 60 ℃ as the grading basis of the asphalt grade, the technical indexes and the performance requirements of the two specifications on each grade of asphalt are different, the market demand of Australian C-50 asphalt is huge, and the index requirements of products are greatly different from the index requirements of asphalt products of different brands in China, so that each oil refining manufacturer in China cannot produce products meeting the index requirements of Australian C-50 asphalt according to the traditional petroleum refining raw materials and technical processes in China.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides combined asphalt and a preparation method thereof, and the combined asphalt meets the quality index requirement of Australian C-50 asphalt, and solves the problem that asphalt products produced by adopting traditional petroleum refining raw materials, formulas and processes in China cannot reach the quality index of Australian C-50 asphalt.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the combined asphalt comprises the following components in parts by mass: 82-94 parts of vacuum residuum, 4-12 parts of heavy deasphalted oil and 2-6 parts of light deasphalted oil.
The invention carries out dehydrogenation-oxidation reaction on the mixed oil of vacuum residuum, heavy deasphalted oil and light deasphalted oil according to the proportion, and the prepared asphalt meets the quality index requirement of Australian C-50 asphalt.
As a preferred embodiment of the combined asphalt, the invention comprises the following components in parts by mass: 85-91 parts of vacuum residuum, 6-10 parts of heavy deasphalted oil and 3-5 parts of light deasphalted oil. The performance of the combined asphalt prepared by the mixture ratio is better.
As a preferred embodiment of the combined asphalt, the invention comprises the following components in parts by mass: 88 parts of vacuum residuum, 8 parts of heavy deasphalted oil and 4 parts of light deasphalted oil. The performance of the combined asphalt prepared by the mixture ratio is optimal.
As a preferred embodiment of the combined asphalt of the present invention, the mass ratio of heavy deasphalted oil to light deasphalted oil is 2:1.
As a preferred embodiment of the combined asphalt of the present invention, the penetration of the vacuum residuum is from 100 (1/10 mm) to 120 (1/10 mm).
As a preferred embodiment of the combined asphalt of the present invention, the vacuum residuum has a composition comprising: the saturated content is 10% -20%, the aromatic content is 45% -65%, the colloid content is 15% -35%, and the asphaltene content is 3% -8%.
As a preferred embodiment of the combined asphalt of the present invention, the vacuum residuum preparation method is as follows: the petroleum crude oil is subjected to atmospheric and vacuum distillation shallow drawing production in a petroleum refinery, and vacuum residuum is obtained, wherein the technological parameters of atmospheric and vacuum distillation are shown in table 1.
TABLE 1
As a preferred embodiment of the combined asphalt of the present invention, the petroleum crude oil of the vacuum residuum is at least one of a sauter heavy crude oil and a Kewit crude oil.
As a preferred embodiment of the combined asphalt of the present invention, the sauter heavy crude oil is a medium heavy crude oil produced from sauter arabia, and its properties are as follows: the density (20 ℃) is 0.870-0.890g/cm 3 Viscosity (50 ℃ C.) of 13.2-17.5mm 2 The condensation point is less than-18 ℃, the carbon residue is 6.8-9.5%, and the wax content is 5.8-9.5%.
As a preferred embodiment of the combined asphalt of the present invention, the kowtow crude oil is an intermediate crude oil produced from kowtow, and its properties are as follows: the density (20 ℃) is 0.868-0.895g/cm 3 Viscosity (50 ℃ C.) of 12.3-16.7mm 2 And/s, the condensation point is < -19.5 ℃, the carbon residue is 7.6-9.2%, and the wax content is 6.2-9.4%.
As a preferred embodiment of the combined asphalt of the present invention, the heavy deasphalted oil has a dynamic viscosity of 5Pa.s to 30Pa.s at 60 ℃, an open flash point of >250 ℃, and a condensed ring aromatic content of >40%.
As a preferred embodiment of the combined asphalt of the present invention, the heavy deasphalted oil is prepared by: the method is characterized in that vacuum residuum obtained after processing and processing the American Baken crude oil by an atmospheric and vacuum distillation device is used as a raw material, and after the vacuum residuum is processed by a refinery propane solvent deasphalting process device, light components (light deasphalted oil) and heavy components (propylene deasphalted oil) are removed, and the rest intermediate components are heavy deasphalted oil.
As a preferred embodiment of the combined asphalt of the present invention, the american bucken crude is a paraffinic crude produced from the united states, the properties of which are as follows: the density (20 ℃) is 0.830 to 0.855g/cm 3 Viscosity (50 ℃ C.) of 2.3-6.5mm 2 The condensation point is < -32 ℃, the carbon residue is 3.8-6.2%, and the wax content is 4.2-5.5%.
As a preferred embodiment of the combined asphalt of the invention, the dynamic viscosity of the light extracted oil at 60 ℃ is 1 Pa.s-10 Pa.s, and the open flash point is more than 250 ℃.
As a preferred embodiment of the combined asphalt of the present invention, the light extracted oil component is composed of: the content of monocyclic aromatic component is more than 30%, the content of bicyclic aromatic component is more than 20%, and the content of polycyclic aromatic component is less than 5%.
As a preferred embodiment of the combined asphalt, the preparation method of the light extracted oil comprises the following steps: the method comprises the steps of processing the amann crude oil by an atmospheric and vacuum distillation device to obtain vacuum residuum as a raw material, processing the vacuum residuum by a propane solvent deasphalting process device in an oil refinery to obtain light deasphalted oil, processing the light deasphalted oil by a furfural refining process device, and removing few-ring long-side chain hydrocarbon components in the light deasphalted oil to obtain the light deasphalted extract oil.
As a preferred embodiment of the combined asphalt of the present invention, the Acman crude oil is paraffin wax-intermediate crude oil produced from Acman and having a density (20 ℃) of 0.850 to 0.860g/cm 3 Viscosity (50 ℃ C.) of 6.6-10.3mm 2 The condensation point is less than-30 ℃, the carbon residue is 2.8-5.5%, and the wax content is 6.3-8.5%.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring the heavy deasphalted oil and the light deasphalted oil at 100-130 ℃ for 24-48h to obtain mixed oil after full dehydrogenation-oxidation reaction;
(2) Heating vacuum residuum to 120-140 ℃, injecting the heated vacuum residuum into an asphalt blending tank, mechanically stirring at 120-140 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2-3h to fully react active components, thus obtaining the combined asphalt.
The heavy deasphalted oil and the light deasphalted oil with specific properties and components are mixed according to a specific proportion, and then the active components of the heavy deasphalted oil and the light deasphalted oil are subjected to dehydrogenation-oxidation reaction under the condition of long-time heating and stirring, and vacuum residuum is added into the mixed oil of the heavy deasphalted oil and the light deasphalted oil, so that the active components in the components are fully reacted, and the stability and ageing resistance of various viscosity indexes (dynamic viscosity at 60 ℃ and kinematic viscosity at 135 ℃) of the combined asphalt can be improved in the whole preparation process, so that the quality index requirements of Australian C-50 asphalt can be met.
The storage temperature of the combined asphalt is 110-130 ℃ and the storage time is 15 days.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention mixes the mixed oil of heavy deasphalted oil and light deasphalted oil with vacuum residuum to prepare the combined asphalt, which solves the problem that asphalt products produced by adopting traditional petroleum refining raw materials, formulas and processes in China can not reach the quality index of Australian C-50 asphalt.
(2) The raw materials of the combined asphalt are easy to obtain, the production process is simple, and the combined asphalt is suitable for industrial production.
(3) The formula and the preparation process of the combined asphalt fill the blank of the technology for producing export asphalt in China, and promote the export competitiveness of asphalt products in China.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
In the following examples, the vacuum residuum was prepared by: petroleum crude oil is subjected to atmospheric and vacuum distillation shallow drawing in a petroleum refinery to obtain vacuum residuum, wherein the technological parameters of atmospheric and vacuum distillation are shown in table 2.
TABLE 2
The petroleum crude oil of the vacuum residuum is at least one of Saudi heavy crude oil and Kewit crude oil.
The sauter heavy crude oil is an intermediate heavy crude oil produced from sauter arabia, and the performances are as follows: the density (20 ℃) is 0.870-0.890g/cm 3 Viscosity (50 ℃ C.) of 13.2-17.5mm 2 The condensation point is less than-18 ℃, the carbon residue is 6.8-9.5%, and the wax content is 5.8-9.5%.
The Kevlet crude oil is an intermediate crude oil produced from Kevlet and has the following properties: the density (20 ℃) is 0.868-0.895g/cm 3 Viscosity (50 ℃ C.) of 12.3-16.7mm 2 And/s, the condensation point is < -19.5 ℃, the carbon residue is 7.6-9.2%, and the wax content is 6.2-9.4%.
The heavy deasphalted oil has a dynamic viscosity at 60 ℃ of 18pa.s, an open flash point >250 ℃ and a condensed aromatic content=57.8%.
The preparation method of the heavy deasphalted oil comprises the following steps: the method is characterized in that vacuum residuum obtained after processing and processing the American Baken crude oil by an atmospheric and vacuum distillation device is used as a raw material, and after the vacuum residuum is processed by a refinery propane solvent deasphalting process device, light components (light deasphalted oil) and heavy components (propylene deasphalted oil) are removed, and the rest intermediate components are heavy deasphalted oil.
The U.S. bacon crude oil is paraffin-based crude oil produced in the U.S. and has the following properties: the density (20 ℃) is 0.830 to 0.855g/cm 3 Viscosity (50 ℃ C.) of 2.3-6.5mm 2 The condensation point is < -32 ℃, the carbon residue is 3.8-6.2%, and the wax content is 4.2-5.5%.
The 60 ℃ dynamic viscosity of the light extracted oil is 3.9Pa.s, the open flash point is >250 ℃, the single-ring aromatic content=37.5%, the double-ring aromatic content=28.6%, and the multiple-ring aromatic content=3.2%.
The preparation method of the light extracted oil comprises the following steps: the method comprises the steps of processing the amann crude oil by an atmospheric and vacuum distillation device to obtain vacuum residuum as a raw material, processing the vacuum residuum by a propane solvent deasphalting process device in an oil refinery to obtain light deasphalted oil, processing the light deasphalted oil by a furfural refining process device, and removing few-ring long-side chain hydrocarbon components in the light deasphalted oil to obtain the light deasphalted extract oil.
The Arman crude oil is paraffin wax-intermediate crude oil produced from Arman, and has density (20deg.C) of 0.850-0.860g/cm 3 Viscosity (50 ℃ C.) of 6.6-10.3mm 2 The condensation point is less than-30 ℃, the carbon residue is 2.8-5.5%, and the wax content is 6.3-8.5%.
The storage temperature of the combined asphalt is 110-130 ℃ and the storage time is 15 days.
Example 1
The invention provides combined asphalt which comprises the following components in parts by weight: 4 parts of heavy deasphalted oil, 2 parts of light deasphalted oil and 94 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 116 (1/10 mm), and the components are as follows: saturated fraction=14.6%, aromatic fraction=53.2%, colloid content=25.9%, asphaltene content=6.3%; the petroleum crude oil of the vacuum residuum is sauter heavy crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring the heavy deasphalted oil and the light deasphalted oil at 110 ℃ for 36 hours to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 120 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 130 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2 hours to fully react active components, thus obtaining the combined asphalt.
Example 2
The invention provides combined asphalt which comprises the following components in parts by weight: 5 parts of heavy deasphalted oil, 2.5 parts of light deasphalted oil and 92.5 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 116 (1/10 mm), and the components are as follows: saturated fraction=14.6%, aromatic fraction=53.2%, colloid content=25.9%, asphaltene content=6.3%; the petroleum crude oil of the vacuum residuum is sauter heavy crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 110 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 120 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 130 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2 hours to fully react active components, thus obtaining the combined asphalt.
Example 3
The invention provides combined asphalt which comprises the following components in parts by weight: 6 parts of heavy deasphalted oil, 3 parts of light deasphalted oil and 91 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 116 (1/10 mm), and the components are as follows: saturated fraction=14.6%, aromatic fraction=53.2%, colloid content=25.9%, asphaltene content=6.3%; the petroleum crude oil of the vacuum residuum is sauter heavy crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 110 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 130 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 130 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2 hours to fully react active components, thus obtaining the combined asphalt.
Example 4
The invention provides combined asphalt which comprises the following components in parts by weight: 8 parts of heavy deasphalted oil, 4 parts of light deasphalted oil and 88 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 109 (1/10 mm), and the components are as follows: saturated fraction=13.8%, aromatic fraction=50.2%, colloid content=28.8%, asphaltene content=7.2%; the petroleum crude oil of the vacuum residue is a mixture of Keweit crude oil and sauter heavy crude oil, and the mass ratio of Keweit crude oil to sauter heavy crude oil is 1:1.
the invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 110 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 130 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 140 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2.5h to fully react active components, thus obtaining the combined asphalt.
Example 5
The invention provides combined asphalt which comprises the following components in parts by weight: 10 parts of heavy deasphalted oil, 5 parts of light deasphalted oil and 85 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 103 (1/10 mm), and the components are as follows: saturated fraction=13.4%, aromatic fraction=49.7%, colloid content=29.5%, asphaltene content=7.4%; the petroleum crude oil of the vacuum residue is Kewit crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 120 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 135 deg.c, injecting into asphalt blending tank, mechanical stirring at 145 deg.c, adding the mixed oil obtained in step (1) under mechanical stirring, stirring for 3 hr to react the active components fully to obtain the composite asphalt.
Example 6
The invention provides combined asphalt which comprises the following components in parts by weight: 11 parts of heavy deasphalted oil, 5.5 parts of light deasphalted oil and 83.5 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 103 (1/10 mm), and the components are as follows: saturated fraction=13.4%, aromatic fraction=49.7%, colloid content=29.5%, asphaltene content=7.4%; the petroleum crude oil of the vacuum residue is Kewit crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 120 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 135 deg.c, injecting into asphalt blending tank, mechanical stirring at 145 deg.c, adding the mixed oil obtained in step (1) under mechanical stirring, stirring for 3 hr to react the active components fully to obtain the composite asphalt.
Example 7
The invention provides combined asphalt which comprises the following components in parts by weight: 12 parts of heavy deasphalted oil, 6 parts of light deasphalted oil and 82 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 103 (1/10 mm), and the components are as follows: saturated fraction=13.4%, aromatic fraction=49.7%, colloid content=29.5%, asphaltene content=7.4%; the petroleum crude oil of the vacuum residue is Kewit crude oil.
The invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring heavy deasphalted oil and light deasphalted oil at 120 ℃ for 36h to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 135 deg.c, injecting into asphalt blending tank, mechanical stirring at 145 deg.c, adding the mixed oil obtained in step (1) under mechanical stirring, stirring for 3 hr to react the active components fully to obtain the composite asphalt.
Example 8
The invention provides combined asphalt which comprises the following components in parts by weight: 8 parts of heavy deasphalted oil, 4 parts of light deasphalted oil and 88 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 109 (1/10 mm), and the components are as follows: saturated fraction=13.8%, aromatic fraction=50.2%, colloid content=28.8%, asphaltene content=7.2%; the petroleum crude oil of the vacuum residue is a mixture of Keweit crude oil and sauter heavy crude oil, and the mass ratio of Keweit crude oil to sauter heavy crude oil is 1:1.
the invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring the heavy deasphalted oil and the light deasphalted oil at 100 ℃ for 24 hours to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a full dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 120 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 120 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 3 hours to fully react active components, thus obtaining the combined asphalt.
Example 9
The invention provides combined asphalt which comprises the following components in parts by weight: 8 parts of heavy deasphalted oil, 4 parts of light deasphalted oil and 88 parts of vacuum residuum;
wherein the penetration of the vacuum residue is 109 (1/10 mm), and the components are as follows: saturated fraction=13.8%, aromatic fraction=50.2%, colloid content=28.8%, asphaltene content=7.2%; the petroleum crude oil of the vacuum residue is a mixture of Keweit crude oil and sauter heavy crude oil, and the mass ratio of Keweit crude oil to sauter heavy crude oil is 1:1.
the invention also provides a preparation method of the combined asphalt, which comprises the following steps:
(1) Stirring the heavy deasphalted oil and the light deasphalted oil at 130 ℃ for 48 hours to uniformly mix the heavy deasphalted oil and the light deasphalted oil and perform a sufficient dehydrogenation-oxidation reaction to obtain mixed oil;
(2) Heating vacuum residuum to 140 ℃, injecting the vacuum residuum into an asphalt blending tank, mechanically stirring at 150 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2 hours to fully react active components, thus obtaining the combined asphalt.
Effect example
The combined asphalt obtained in examples 1-9 was tested for various properties according to the test methods T0604, T0620, T0619, T0646, T0633, T0609 in JTG E20-2011, the test procedure for asphalt mixtures for highway engineering, and the test results are shown in Table 3.
TABLE 3 Table 3
As can be seen from Table 3, the combined asphalt prepared by the formula and the preparation method of the invention completely meets the quality index requirements of Australian C-50 asphalt.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that those skilled in the art will understand that the technical scheme of the invention may be modified or equally substituted without departing from the spirit and scope of the technical scheme of the invention.
Claims (6)
1. The combined asphalt is characterized by comprising the following components in parts by mass: 82-94 parts of vacuum residuum, 4-12 parts of heavy deasphalted oil and 2-6 parts of light deasphalted oil; the dynamic viscosity of the heavy deasphalted oil at 60 ℃ is 5 Pa.s-30 Pa.s, the open flash point is more than 250 ℃, and the content of condensed ring aromatic components is more than 40%;
the components of the vacuum residuum are as follows: the saturated content is 10-20%, the aromatic content is 45-65%, the colloid content is 15-35%, and the asphaltene content is 3-8%;
the dynamic viscosity of the light extracted oil at 60 ℃ is 1 Pa.s-10 Pa.s, and the open flash point is more than 250 ℃.
2. The combined asphalt according to claim 1, which comprises the following components in parts by mass: 85-91 parts of vacuum residuum, 6-10 parts of heavy deasphalted oil and 3-5 parts of light deasphalted oil.
3. The combined asphalt according to claim 2, which comprises the following components in parts by mass: 88 parts of vacuum residuum, 8 parts of heavy deasphalted oil and 4 parts of light deasphalted oil.
4. A combination asphalt according to any one of claims 1 to 3, wherein the penetration of the vacuum residuum is from 100 (1/10 mm) to 120 (1/10 mm).
5. A combination asphalt according to any one of claims 1 to 3, wherein the light extract oil component is composed of: the content of monocyclic aromatic component is more than 30%, the content of bicyclic aromatic component is more than 20%, and the content of polycyclic aromatic component is less than 5%.
6. A method for preparing a combined asphalt according to any one of claims 1 to 5, comprising the steps of:
(1) Stirring the heavy deasphalted oil and the light deasphalted oil at 100-130 ℃ for 24-48h to obtain mixed oil after full dehydrogenation-oxidation reaction;
(2) Heating vacuum residuum to 120-140 ℃, injecting the heated vacuum residuum into an asphalt blending tank, mechanically stirring at 120-140 ℃, adding the mixed oil obtained in the step (1) under mechanical stirring, and continuously stirring for 2-3h to fully react active components, thus obtaining the combined asphalt.
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