Road asphalt and synthesis method thereof

Abstract

The invention discloses road asphalt and a synthesis method thereof. The preparation method of the road asphalt comprises the following steps: (1) mixing catalytic slurry oil and vacuum residue, and then carrying out supercritical solvent deasphalting separation to separate different components of DAO, namely four components of 1 # DAO, 2 # DAO, 3 # DAO and DOA; (2) contacting the 1 # DAO component separated in the step (1) with a catalyst to react to obtain a product I, and respectively mixing the 2 # DAO component and the 3 # DAO component separated in the step (1) with a cross-linking agent to react to obtain a product II and a product III; and (3) blending the DOA separated in the step (1) with the product I, the product II and the product III obtained in the step (2) to obtain the road asphalt. The road asphalt material synthesized by adopting the synthesis method disclosed by the invention meets the technical requirements of hard road petroleum asphalt, so that oil slurry resources with low additional value are reasonably utilized.

Description

Technical Field

[0001] The present invention relates to the cross - field of petrochemical industry and heavy oil processing, and particularly relates to a road asphalt and a synthesis method thereof. Background Art

[0002] Catalytic slurry is the remaining aromatic - rich waste slurry discharged from the catalytic cracking unit during the petroleum refining process. In terms of composition, it has a high aromatic content, mostly above 55%, a low content of gum and asphaltene, and a saturated hydrocarbon content mostly below 35%. It is an excellent component for improving the quality of asphalt. However, the catalytic slurry itself has a low viscosity and a low degree of condensation, and its polycyclic aromatic hydrocarbons have unstable active carbon bonds, which are prone to oxidation and condensation reactions. The actual application effect shows that directly using catalytic slurry to blend asphalt will cause a series of problems such as poor temperature - sensitivity performance and poor anti - aging performance of asphalt products, affecting the service life of the road surface. Affected by the properties of catalytic slurry itself, its addition amount in road asphalt is generally not more than 20%, and the utilization rate is relatively low.

[0003] The solvent deasphalting process is an effective means for processing heavy oil or residue oil, which selectively separates heavy oil or residue oil by using different saturated hydrocarbon solvents. When using the solvent deasphalting process to process catalytic slurry to produce road asphalt, generally, a small amount of catalytic slurry is mixed with heavy oil or residue oil, and then a small amount of non - polar saturated hydrocarbons and aromatic hydrocarbons are separated through a solvent deasphalting device. Since the amount of asphalt used is limited, adding a small amount of catalytic slurry cannot solve the fundamental problems in the slurry process.

[0004] CN1102847A discloses a method for producing heavy traffic road asphalt by oxidizing catalytic slurry with ferric trichloride or phosphorus pentoxide as a catalyst and then blending it with solvent - deasphalted asphalt or vacuum residue. Since there are more light components in the slurry, direct oxidation will result in a higher volatilization rate of light components, reducing the effective utilization rate of the slurry and polluting the environment.

[0005] CN104559241B discloses a method for preparing road asphalt using catalytic slurry. In this method, the catalytic slurry is subjected to vacuum distillation to obtain a topped slurry, and then a cross - linking agent and an activated cross - linking assistant are added to the topped slurry for cross - linking and condensation reaction to obtain a modified slurry, and then the modified slurry is blended with base asphalt to obtain a road asphalt product. The activated cross - linking assistant used in this method is a strong oxidizing substance, which has strong corrosiveness to the device, and does not reasonably utilize the light components of the topped slurry, and requires blending with high - quality base asphalt to maintain the product properties. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a road asphalt and its synthesis method. In the synthesis method of the present invention, according to the complexity of the catalytic slurry components, and the characteristics of high aromatic hydrocarbon content and wide distribution of aromatic components, solvent deasphalting pretreatment is carried out on it to preliminarily separate the complex components in the slurry, make the distribution of aromatic components more concentrated, and carry out reaction control targeted according to the properties of the separated components, so that the synthesized road asphalt material meets the technical requirements of hard road petroleum asphalt, and the low-value slurry resources are reasonably utilized.

[0007] The first aspect of the present invention provides a synthesis method of road asphalt, including the following steps:

[0008] (1) After mixing the catalytic slurry and vacuum residue, carry out supercritical solvent deasphalting separation to separate DAO of different components, namely four components: 1#DAO, 2#DAO, 3#DAO and DOA;

[0009] (2) React the 1#DAO component separated in step (1) with a catalyst to obtain product I, and react the 2#DAO component and 3#DAO component separated in step (1) with a crosslinking agent respectively to obtain product II and product III;

[0010] (3) Blend the DOA separated in step (1) with product I, product II and product III obtained in step (2) to obtain the road asphalt.

[0011] Further, in step (1), the catalytic slurry is the catalytic slurry produced by a catalytic cracking unit from natural petroleum, which is a mixture rich in aromatic hydrocarbons; the mass content of aromatic hydrocarbons in the slurry is 50% - 90%; the mass content of paraffins in the slurry is less than 5%, and the mass content of naphthenes is less than 15%.

[0012] Further, in step (1), the vacuum residue is the product produced by a distillation unit from natural petroleum. The fraction below 440 °C in the vacuum residue does not exceed 9%.

[0013] Further, in step (1), the mass ratio of the catalytic slurry to the vacuum residue is (60 - 80):(20 - 40).

[0014] Further, in step (1), the method of separating the mixture of the catalytic slurry and the vacuum residue adopts the method of supercritical solvent extraction deasphalting, and the solvent used is a low-carbon alkane, preferably one or more mixtures of C3, C4, and C5.

[0015] Further, in step (1), the separation method of supercritical solvent deasphalting for the mixture of catalytic slurry and vacuum residue is adopted, that is, the asphaltene is removed by keeping the extraction temperature constant and gradually increasing the extraction pressure to achieve the separation of different fractions; wherein, the extraction temperature is 80-110 °C, the initial pressure of the extraction pressure is 4-5 MPa, and the maximum pressure does not exceed 12 MPa.

[0016] Further, in step (1), the separation method of supercritical solvent deasphalting for the mixture of catalytic slurry and vacuum residue is adopted. The catalytic slurry is extracted with an alkane solvent, and 1# DAO, 2# DAO, 3# DAO, and DOA are obtained in order from light to heavy. Among them, the mass ratio of 1# DAO is 12%-18%, the mass ratio of 2# DAO is 12%-18%, the mass ratio of 3# DAO is 42%-48%, and the mass ratio of DOA is 22%-28%.

[0017] Further, in step (2), the crosslinking agent is one or more of elemental sulfur, sulfur monochloride, carbon disulfide, thiazoles, thiurams, sulfenamides, guanidines, dithiocarbamates, aldehyde amines, xanthates, thioureas, and isocyanates, preferably elemental sulfur or carbon disulfide.

[0018] Further, in step (2), the catalyst is one or more of boron halogen compounds and halogen acids, preferably hydrofluoric acid, boron trifluoride, or boron trifluoride / hydrofluoric acid. Among them, the mass ratio of boron trifluoride to hydrofluoric acid in boron trifluoride / hydrofluoric acid is (0.01-0.6):3.

[0019] Further, in step (2), 1# DAO in step (1) is reacted under the action of a catalyst, and the mass ratio of 1# DAO to the catalyst is (1-2):(3-8).

[0020] Further, in step (2), 1# DAO in step (1) is contacted with the catalyst and reacted during stirring. The stirring speed of the reaction kettle is 100 r / min - 200 r / min, the reaction temperature is 160 °C - 200 °C, the reaction pressure is 1.0 MPa - 1.5 MPa, and the reaction time is 3 h - 10 h. When the softening point of the material reaches 20-40 °C, the reaction is stopped to obtain product I.

[0021] Further, in step (2), 2# DAO in step (1) is reacted under the action of a crosslinking agent, and the mass ratio of 2# DAO to the crosslinking agent is (10-20):(2-6).

[0022] Further, in step (2), 2# DAO in step (1) is contacted with a crosslinking agent and reacted under a closed condition, and the reaction is carried out during stirring. The stirring speed is 100 r / min to 200 r / min, the reaction temperature is 280 °C to 320 °C, the reaction pressure is 0.5 MPa to 1.2 MPa, and the reaction time is 3 h to 8 h. Then, under the condition that the stirring speed and the reaction pressure remain unchanged, the reaction temperature is adjusted to 360 °C to 400 °C, and the reaction is carried out for another 0.1 h to 2 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, the reaction is stopped to obtain Product II. An inert gas, preferably nitrogen, is introduced into the sealed environment.

[0023] Further, in step (2), 3# DAO in step (1) is reacted under the action of a crosslinking agent, and the mass ratio of 3# DAO to the crosslinking agent is (10 - 20):(1 - 3).

[0024] Further, in step (2), 3# DAO in step (1) and the crosslinking agent are mixed and reacted during stirring. The stirring speed is 100 r / min to 200 r / min, the reaction temperature is 180 °C to 200 °C, the reaction pressure is 1.5 MPa to 2.0 MPa, and the reaction time is 1 h to 5 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, the reaction is stopped to obtain Product III.

[0025] Further, in step (3), DOA in step (1) is stirred and mixed with Product I, Product II, and Product III according to a mass ratio of (8 - 20):(30 - 45):(28 - 35):(13 - 22). The stirring speed is 200 r / min to 500 r / min, the stirring temperature is 180 °C to 220 °C, and the stirring time is 1 h to 3 h to obtain a road asphalt material.

[0026] In the second aspect of the present invention, a road asphalt obtained by the above synthesis method is provided.

[0027] Further, the road asphalt meets the technical requirements of GB / T 38075-2019 "Hard Road Petroleum Asphalt". Among them, the penetration (0.1 mm) of the road asphalt material of the present invention at 25 °C is 10 - 40, meeting the requirements of HA-15, HA-25, and HA-35; the softening point is not less than 55 °C, meeting the requirements of HA-15, HA-25, and HA-35; the ductility at 10 °C is not less than 10 cm, meeting the requirements of HA-15, HA-25, and HA-35.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) In the synthesis method provided by the present invention, the components of catalytic slurry are precisely separated through the supercritical solvent deasphalting process, making the characteristics of each component slurry more concentrated, the reaction easier to control, and realizing the precise fractional utilization of the slurry.

[0030] (2) In the method provided by the present invention, through the catalytic reaction at a lower temperature, the low-boiling-point and low-polymerization-degree molecules in the catalytic slurry are slowly polycondensed, effectively avoiding volatilization and reducing environmental pollution.

[0031] (3) In the method provided by the present invention, after separating the oligomeric aromatics and the highly polymeric aromatics and carrying out crosslinking and condensation reactions respectively, the reaction conditions are set according to their respective reaction activities, improving the reaction efficiency of crosslinking and condensation.

[0032] (4) In the method provided by the present invention, by controlling the reaction products, the defect that the content of oligomeric aromatics in the catalytic slurry is high and the content of gum and asphaltene is low is effectively made up for, making it closer to the reasonable composition of road asphalt.

[0033] (5) Each component in the road asphalt provided by the present invention cooperates with each other and acts together, making the material have outstanding stability, meeting the technical requirements of existing hard road petroleum asphalt for catalysis, and while taking into account the performance of road asphalt, the slurry resources are fully and reasonably utilized, having a high resource utilization value. Specific Embodiments

[0034] The technical solutions and effects of the present invention will be further illustrated below through examples. The examples are implemented on the premise of the technical solutions of the present invention, and the detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following examples.

[0035] Example 1

[0036] Using a supercritical solvent deasphalting device, with propane as the solvent, the catalytic slurry and the 3:1 mixture of vacuum residue are extracted and separated in a constant-temperature and pressure-increasing manner. The extraction temperature is 98 °C, the initial extraction pressure is 4.3 MPa, and the maximum is 12 MPa. By mass, the initial 15% fraction is obtained as 1#DAO, the 15% - 30% fraction is obtained as 2#DAO, the 30% - 75% fraction is obtained as 3#DAO, and the fraction greater than 75% is obtained as DOA. The specific components and contents are shown in Table 1.

[0037] Among them, the catalytic slurry (the slurry is the catalytic slurry produced by the catalytic cracking unit of natural petroleum, and is a mixture rich in aromatics. The content of aromatics in the slurry is 68% (by mass). The mass content of paraffins in the slurry is 4.7%, and the mass content of naphthenes is 10.8%). Vacuum residue (the fraction below 460 °C in the vacuum residue is 6.7%).

[0038] Add 1# DAO and boron fluoride / hydrofluoric acid catalyst into the reaction kettle and stir for reaction. The mass ratio of 1# DAO to the catalyst is 1:3, the mass ratio of boron fluoride to hydrofluoric acid is 0.01:3, the stirring speed is 150 r / min, the reaction temperature is 160 °C, the reaction pressure is 1.1 MPa, and the reaction time is 9 h. When the softening point of the material reaches 30 °C, stop the reaction to obtain Product I.

[0039] Add 2# DAO and elemental sulfur crosslinking agent into the reaction kettle and stir for reaction. The mass ratio of 2# DAO to the crosslinking agent is 20:3. After purging with nitrogen, seal the reaction kettle. The stirring speed is 150 r / min, the reaction temperature is 300 °C, the reaction pressure is 1.0 MPa, and the reaction time is 7 h. Then, under the condition that the stirring speed and reaction pressure remain unchanged, adjust the reaction temperature to 380 °C and continue the reaction for 1 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, stop the reaction to obtain Product II.

[0040] Add 3# DAO and elemental sulfur crosslinking agent into the reaction kettle and stir for reaction. The mass ratio of 3# DAO to the crosslinking agent is 20:1, the stirring speed is 150 r / min, the reaction temperature is 190 °C, the reaction pressure is 1.8 MPa, and the reaction time is 4 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, stop the reaction to obtain Product III.

[0041] Stir and mix DOA with Product I, Product II, and Product III according to the mass ratio of 21:9:42:28. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain the road asphalt material.

[0042] Table 1 Component contents obtained by solvent deasphalting of the catalytic oil slurry and vacuum residue mixture

[0043] Component Name 1#DAO 2#DAO 3#DAO DOA Component Mass Content, % 15 15 45 25

[0044] Example 2

[0045] The components and contents obtained by solvent deasphalting of the catalytic oil slurry and vacuum residue mixture are the same as those in Example 1. The specific contents are shown in Table 1.

[0046] Among them, the catalytic oil slurry (the oil slurry is the catalytic oil slurry produced by the catalytic cracking unit of natural petroleum and is a mixture rich in aromatics. The aromatic content in the oil slurry is 68% (by mass). The paraffin mass content of the oil slurry is 4.7%, and the naphthene mass content is 10.8%). Vacuum residue (the fraction below 460 °C in the vacuum residue is 6.7%).

[0047] Add 1# DAO and hydrofluoric acid catalyst into a reaction kettle and stir to carry out the reaction. The mass ratio of 1# DAO to the catalyst is 1:5, the mass ratio of boron fluoride to hydrofluoric acid is 0.1:3, the stirring speed is 150 r / min, the reaction temperature is 180 °C, the reaction pressure is 1.3 MPa, and the reaction time is 6 h. When the softening point of the material reaches 30 °C, stop the reaction to obtain Product I.

[0048] Add 2# DAO and elemental sulfur crosslinking agent into a reaction kettle and stir to carry out the reaction. The mass ratio of 2# DAO to the crosslinking agent is 10:3. After purging with nitrogen, seal the reaction kettle. The stirring speed is 150 r / min, the reaction temperature is 320 °C, the reaction pressure is 0.6 MPa, and the reaction time is 6 h. Then, under the condition that the stirring speed and reaction pressure remain unchanged, adjust the reaction temperature to 370 °C and continue the reaction for 2 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, stop the reaction to obtain Product II.

[0049] Add 3# DAO and elemental sulfur crosslinking agent into a reaction kettle and stir to carry out the reaction. The mass ratio of 3# DAO to the crosslinking agent is 10:1.5, the stirring speed is 150 r / min, the reaction temperature is 180 °C, the reaction pressure is 1.9 MPa, and the reaction time is 5 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, stop the reaction to obtain Product III.

[0050] Stir and mix DOA with Product I, Product II, and Product III at a mass ratio of 18:15:37:31. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain a road asphalt material.

[0051] Example 3

[0052] The components and contents obtained by solvent deasphalting of the catalytic oil slurry and vacuum residue mixture are the same as those in Example 1, and the specific contents are shown in Table 1.

[0053] Among them, the catalytic oil slurry (the oil slurry is the catalytic oil slurry produced by a catalytic cracking unit from natural petroleum and is a mixture rich in aromatics. The aromatic content in the oil slurry is 68% (by mass). The mass content of paraffins in the oil slurry is 4.7%, and the mass content of naphthenes is 10.8%). Vacuum residue (the fraction below 460 °C in the vacuum residue is 6.7%).

[0054] Add 1# DAO and boron trifluoride / hydrofluoric acid catalyst into a reaction kettle, stir and react. The mass ratio of 1# DAO to the catalyst is 1:8, the mass ratio of boron trifluoride to hydrofluoric acid is 0.5:3, the stirring speed is 150 r / min, the reaction temperature is 200 °C, the reaction pressure is 1.5 MPa, and the reaction time is 4 h. When the softening point of the material reaches 30 °C, stop the reaction to obtain Product I.

[0055] Add 2# DAO and carbon disulfide crosslinking agent into a reaction kettle, stir and react. The mass ratio of 2# DAO to the crosslinking agent is 10:6. After purging with nitrogen, seal the reaction kettle. The stirring speed is 150 r / min, the reaction temperature is 290 °C, the reaction pressure is 1.2 MPa, and the reaction time is 4 h. Then, under the condition that the stirring speed and reaction pressure remain unchanged, adjust the reaction temperature to 400 °C and react for another 1.5 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, stop the reaction to obtain Product II.

[0056] Add 3# DAO and carbon disulfide crosslinking agent into a reaction kettle, stir and react. The mass ratio of 3# DAO to the crosslinking agent is 10:3, the stirring speed is 150 r / min, the reaction temperature is 200 °C, the reaction pressure is 1.6 MPa, and the reaction time is 2 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, stop the reaction to obtain Product III.

[0057] Stir and mix DOA with the reactants of 1# DAO, 2# DAO, and 3# DAO at a mass ratio of 15:18:34:33. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain a road asphalt material.

[0058] Comparative Example 1

[0059] The components and contents obtained by solvent deasphalting of the catalytic oil slurry and vacuum residue mixture are the same as those in Example 1, and the specific contents are shown in Table 1.

[0060] Add 1# DAO into a reaction kettle, stir and react. The stirring speed is 150 r / min, the reaction temperature is 160 °C, the reaction pressure is 1.1 MPa, and the reaction time is 9 h. Stop the reaction to obtain Product I.

[0061] Add 2# DAO into a reaction kettle, stir and react. After purging with nitrogen, seal the reaction kettle. The stirring speed is 150 r / min, the reaction temperature is 300 °C, the reaction pressure is 1.0 MPa, and the reaction time is 7 h. Then, under the condition that the stirring speed and reaction pressure remain unchanged, adjust the reaction temperature to 380 °C and react for another 1 h. Stop the reaction to obtain Product II.

[0062] Add 3#DAO to the reactor and stir for reaction. The stirring speed is 150 r / min, the reaction temperature is 190 °C, the reaction pressure is 1.8 MPa, and the reaction time is 4 h. Then stop the reaction to obtain Product III.

[0063] Stir and mix DOA with the reactants of 1#DAO, 2#DAO, and 3#DAO at a mass ratio of 21:9:42:28. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain the road asphalt material.

[0064] Comparative Example 2

[0065] The components and contents obtained by solvent deasphalting of the catalytic slurry and vacuum residue mixture are the same as those in Example 1, and the specific contents are shown in Table 1.

[0066] The crosslinking agent is the same as that in Example 2.

[0067] Add 1#DAO to the reactor and stir for reaction. The stirring speed is 150 r / min, the reaction temperature is 180 °C, the reaction pressure is 1.3 MPa, and the reaction time is 6 h. Then stop the reaction to obtain Product I.

[0068] Add 2#DAO and elemental sulfur crosslinking agent to the reactor and stir for reaction. The mass ratio of 2#DAO to the crosslinking agent is 10:3. After purging with nitrogen, seal the reactor. The stirring speed is 150 r / min, the reaction temperature is 320 °C, the reaction pressure is 0.6 MPa, and the reaction time is 6 h. Then, under the conditions of constant stirring speed and reaction pressure, adjust the reaction temperature to 370 °C and continue the reaction for 2 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, stop the reaction to obtain Product II.

[0069] Add 3#DAO and elemental sulfur crosslinking agent to the reactor and stir for reaction. The mass ratio of 3#DAO to the crosslinking agent is 10:1.5. The stirring speed is 150 r / min, the reaction temperature is 180 °C, the reaction pressure is 1.9 MPa, and the reaction time is 5 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, stop the reaction to obtain Product III.

[0070] Stir and mix DOA with Product I, Product II, and Product III at a mass ratio of 18:15:37:31. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain the road asphalt material.

[0071] Comparative Example 3

[0072] The components and contents obtained by solvent deasphalting of the catalytic slurry and vacuum residue mixture are the same as those in Example 1, and the specific contents are shown in Table 1.

[0073] The catalytic slurry oil source and the vacuum residue source are the same as those in Example 3.

[0074] Add 1# DAO and boron fluoride / hydrofluoric acid catalyst into the reaction kettle and stir for reaction. The mass ratio of 1# DAO to the catalyst is 1:8, the mass ratio of boron fluoride to hydrofluoric acid is 0.5:3, the stirring speed is 150 r / min, the reaction temperature is 200 °C, the reaction pressure is 1.5 MPa, and the reaction time is 4 h. When the softening point of the material reaches 30 °C, stop the reaction to obtain Product I.

[0075] Add 2# DAO into the reaction kettle and stir for reaction. After purging with nitrogen, seal the reaction kettle. The stirring speed is 150 r / min, the reaction temperature is 290 °C, the reaction pressure is 1.2 MPa, and the reaction time is 4 h. Then, under the conditions of constant stirring speed and reaction pressure, adjust the reaction temperature to 400 °C and continue the reaction for 1.5 h. Stop the reaction to obtain Product II.

[0076] Add 3# DAO into the reaction kettle and stir for reaction. The stirring speed is 150 r / min, the reaction temperature is 200 °C, the reaction pressure is 1.6 MPa, and the reaction time is 2 h. Stop the reaction to obtain Product III.

[0077] Stir and mix DOA with Product I, Product II, and Product III at a mass ratio of 15:18:34:33. The stirring speed is 350 r / min, the stirring temperature is 200 °C, and the stirring time is 2 h to obtain the road asphalt material.

[0078] Test

[0079] Test the road asphalt materials prepared in Examples 1 - 3 and Comparative Examples 1 - 3 with reference to some of the technical requirements in GB / T 38075-2019 "Hard Road Petroleum Asphalt". The technical requirements are shown in Table 2, and the test results are shown in Table 3.

[0080] Table 2 Technical Requirements

[0081]

[0082] Table 3 Properties of Road Asphalt Materials

[0083]

[0084] Judging from the comparison results in Table 3, the main indicators of Examples 1 - 3 all meet the requirements of hard road petroleum asphalt, and are significantly better than the performance of Comparative Examples 1 - 3.

Claims

1. A method for synthesizing road asphalt, comprising the following steps: (1) After mixing catalytic slurry and vacuum residue, perform supercritical solvent deasphalting separation to separate four components of DAO with different components, namely 1#DAO, 2#DAO, 3#DAO, and DOA; (2) React the 1#DAO component separated in step (1) with a catalyst to obtain product I, and mix and react the 2#DAO component and 3#DAO component separated in step (1) with a crosslinking agent respectively to obtain product II and product III; (3) Blend the DOA separated in step (1) with product I, product II, and product III obtained in step (2) to obtain the road asphalt.

2. The synthesis method according to claim 1, characterized in that, In step (1), the catalytic slurry is a catalytic slurry produced by a catalytic cracking unit from natural petroleum, which is a mixture rich in aromatics; the mass content of aromatics in the slurry is 50% - 90%; the mass content of paraffins in the slurry is less than 5%, and the mass content of naphthenes is less than 15%; and / or, in step (1), the fraction below 440°C in the vacuum residue does not exceed 9%; and / or, in step (1), the mass ratio of the catalytic slurry to the vacuum residue is (60 - 80):(20 - 40).

3. The synthesis method according to claim 1, characterized in that, In step (1), the separation method of supercritical solvent deasphalting for the mixture of catalytic slurry and vacuum residue is to achieve the separation of different fractions by deasphalting in a way that the extraction temperature is constant and the extraction pressure is gradually increased; among them, the extraction temperature is 80 - 110°C, the initial pressure of the extraction pressure is 4 - 5 MPa, and the maximum pressure does not exceed 12 MPa; Preferably, in step (1), the separation method of supercritical solvent deasphalting for the mixture of catalytic slurry and vacuum residue is to extract the catalytic slurry with an alkane solvent to obtain 1#DAO, 2#DAO, 3#DAO, and DOA in order from light to heavy. Among them, the mass ratio of 1#DAO is 12% - 18%, the mass ratio of 2#DAO is 12% - 18%, the mass ratio of 3#DAO is 42% - 48%, and the mass ratio of DOA is 22% - 28%.

4. The synthesis method according to claim 1, characterized in that, In step (2), the crosslinking agent is one or several of elemental sulfur, sulfur monochloride, carbon disulfide, thiazoles, thiurams, sulfenamides, guanidines, dithiocarbamates, aldehyde amines, xanthates, thiourea, and isocyanates, preferably elemental sulfur or carbon disulfide; and / or, in step (2), the catalyst is one or several of halogen compounds of boron and halogen acids, preferably hydrofluoric acid, boron fluoride, or boron fluoride / hydrofluoric acid.

5. The synthesis method according to claim 1, characterized in that, In step (2), react the 1#DAO in step (1) under the action of a catalyst, and the mass ratio of 1#DAO to the catalyst is (1 - 2):(3 - 8); And / or, in step (2), the 1# DAO in step (1) is contacted with a catalyst and reacts during stirring. The stirring speed of the reaction kettle is 100 r / min to 200 r / min, the reaction temperature is 160 °C to 200 °C, the reaction pressure is 1.0 MPa to 1.5 MPa, and the reaction time is 3 h to 10 h. When the softening point of the material reaches 20 °C to 40 °C, the reaction is stopped to obtain Product I.

6. The synthesis method according to claim 1, characterized in that, In step (2), the 2# DAO in step (1) reacts under the action of a crosslinking agent. The mass ratio of 2# DAO to the crosslinking agent is (10 - 20):(2 - 6); And / or, in step (2), the 2# DAO in step (1) and the crosslinking agent are contacted and reacted under sealing during stirring. The stirring speed is 100 r / min to 200 r / min, the reaction temperature is 280 °C to 320 °C, the reaction pressure is 0.5 MPa to 1.2 MPa, and the reaction time is 3 h to 8 h. Then, under the condition that the stirring speed and the reaction pressure remain unchanged, the reaction temperature is adjusted to 360 °C to 400 °C, and the reaction proceeds for another 0.1 h to 2 h. When the softening point of the material is greater than 110 °C and the asphaltene content is greater than 3%, the reaction is stopped to obtain Product II.

7. The synthesis method according to claim 1, characterized in that, In step (2), the 3# DAO in step (1) reacts under the action of a crosslinking agent. The mass ratio of 3# DAO to the crosslinking agent is (10 - 20):(1 - 3).

8. The synthesis method according to claim 1, characterized in that, In step (2), the 3# DAO in step (1) and the crosslinking agent are mixed and reacted during stirring. The stirring speed is 100 r / min to 200 r / min, the reaction temperature is 180 °C to 200 °C, the reaction pressure is 1.5 MPa to 2.0 MPa, and the reaction time is 1 h to 5 h. When the softening point of the material is greater than 50 °C and the asphaltene content is greater than 1%, the reaction is stopped to obtain Product III.

9. The synthesis method according to claim 1, characterized in that, In step (3), the DOA in step (1) is stirred and mixed with Product I, Product II, and Product III according to the mass ratio of (8 - 20):(30 - 45):(28 - 35):(13 - 22). The stirring speed is 200 r / min to 500 r / min, the stirring temperature is 180 °C to 220 °C, and the stirring time is 1 h to 3 h to obtain a road asphalt material.

10. The road asphalt obtained by the synthesis method according to any one of claims 1 - 9.

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