Methods for preparing asphalt for heavy-duty roads and asphalt for heavy-duty roads

Abstract

This invention relates to the field of road asphalt, specifically to a method for preparing heavy-duty road asphalt and the heavy-duty road asphalt itself. The method for preparing heavy-duty road asphalt provided by this invention includes the following steps: S1: subjecting crude oil to propane deasphalting treatment to obtain de-oiled asphalt; and subjecting reduced-density fourth distillate oil to furfural refining treatment to obtain heavy-extracted oil; S2: blending the de-oiled asphalt and the heavy-extracted oil to obtain heavy-duty road asphalt; in step S2, the total weight of the de-oiled asphalt and the heavy-extracted oil in the blending treatment is 100 parts by weight, wherein the de-oiled asphalt accounts for 70-90 parts by weight and the heavy-extracted oil accounts for 10-30 parts by weight. The method provided by this invention, by blending de-oiled asphalt and heavy-extracted oil in a specific ratio, can produce heavy-duty road asphalt that meets the AH-70 or AH-90 specifications of GB / T15180-2010.

Description

Technical Field

[0001] This invention relates to the field of road asphalt, and more specifically to a method for preparing heavy-duty road asphalt and the heavy-duty road asphalt itself. Background Technology

[0002] Petroleum asphalt is an essential material for national economic construction, especially for building modern economic lifelines—highways and expressways. Propane deasphalting units are part of the lubricating oil production process, primarily producing light and heavy deasphalting oil. The byproduct asphalt, due to its high hardness and poor low-temperature performance, cannot be directly sold as road asphalt; it is mainly used for blending building asphalt or sold as fuel oil, resulting in low economic returns. Other refining byproducts such as furfural extract and catalytic slurry oil can also be used as heavy fuel oil. Because fuel oil is subject to consumption tax per ton, there is a significant price difference between fuel oil and heavy road asphalt. Furthermore, increasing environmental pressures and sluggish fuel oil sales can lead to severe inventory buildup, directly impacting the normal operation of production facilities.

[0003] CN112980485 discloses a method for preparing asphalt using propane, which can effectively separate deasphalted oil and deoiled asphalt and improve the performance of deoiled asphalt. The drawback of this method is that it requires the addition of an alkyl aromatic sulfonic acid dispersant to the deoiled asphalt mixture to improve asphalt performance, resulting in a complex and costly process, and the prepared product is an asphalt mixture. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of low utilization rate and poor economic benefits of de-oiled asphalt in the existing technology, and to provide a method for preparing heavy-duty road asphalt and heavy-duty road asphalt.

[0005] To achieve the above objectives, the present invention provides a method for preparing asphalt for heavy-duty roads, comprising the following steps:

[0006] S1: Propane deasphalting is performed on crude oil to obtain de-oiled asphalt; and

[0007] The reduced fourth fraction oil was refined with furfural to obtain heavy extracted oil;

[0008] S2: The deoiled asphalt is blended with the re-extracted oil to obtain heavy-duty road asphalt;

[0009] In step S1, the crude oil comprises intermediate-based crude oil and paraffin-based crude oil, wherein the intermediate-based crude oil accounts for 79-99 parts by weight and the paraffin-based crude oil accounts for 1-30 parts by weight relative to 100 parts by weight of the crude oil.

[0010] In step S1, the conditions of the propane deasphalting treatment are controlled such that the wax content of the deoiled asphalt is not greater than 1.8 wt%, and the penetration of the deoiled asphalt is 25 1 / 10 mm to 45 1 / 10 mm; and the conditions of the furfural refining treatment are controlled such that the wax content of the re-extracted oil is not greater than 3.5 wt%, the saturated hydrocarbon content of the re-extracted oil is not greater than 10 wt%, and the aromatic hydrocarbon content is not less than 60 wt%.

[0011] In step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 70-90 parts by weight and the re-extracted oil accounts for 10-30 parts by weight.

[0012] Preferably, in step S1, the furfural refining process includes:

[0013] S11: The reduced-four distillate oil and furfural are extracted in an extraction tower, wherein the reduced-four distillate oil is fed from the bottom of the extraction tower and the furfural is fed from the top of the extraction tower, and the feed weight ratio of the reduced-four distillate oil to the furfural is 1:(1.8-2.8).

[0014] S12: After the extracted oil produced at the bottom of the extraction tower is subjected to sedimentation treatment, the lower liquid is separated to obtain re-extracted oil.

[0015] Preferably, in step S11, the top temperature of the extraction column is 123℃-127℃, the bottom temperature is 88℃-92℃, and the bottom pressure is 0.5MPa-0.9MPa.

[0016] Preferably, in step S12, the temperature of the sedimentation treatment is 40℃-50℃, the pressure is 0.3MPa-0.8MPa, and the sedimentation time is 15min-30min.

[0017] Preferably, in step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, with the deoiled bitumen accounting for 75-90 parts by weight and the re-extracted oil accounting for 10-25 parts by weight.

[0018] Preferably, the total weight of the deoiled bitumen and the re-extracted oil used in the blending process is 100 parts by weight, wherein the deoiled bitumen accounts for 77-80 parts by weight and the re-extracted oil accounts for 20-23 parts by weight.

[0019] Preferably, in step S1, the conditions of the propane deasphalting treatment are controlled such that the softening point of the deoiled asphalt is 50℃-65℃.

[0020] Preferably, in step S1, the conditions of the propane deasphalting treatment are controlled so that the flash point of the de-oiled asphalt is not lower than 315°C.

[0021] Preferably, in step S1, the conditions of the furfural refining process are controlled so that the flash point of the re-extracted oil is not lower than 240°C.

[0022] Preferably, in step S1, the conditions of the furfural refining treatment are controlled so that the pour point of the re-extracted oil is not higher than 25°C.

[0023] Preferably, in step S1, the conditions of the furfural refining process are controlled so that the initial boiling point of the re-extracted oil is not lower than 325°C.

[0024] Preferably, in step S2, the temperature of the blending treatment is 120℃-140℃, and the blending time is 3min-10min.

[0025] Preferably, the intermediate base crude oil is selected from at least one of Angolan Prutoni crude oil, Kaiserje crude oil, Saudi Arabian medium crude oil, Mahira crude oil, Hango crude oil, and Oman crude oil.

[0026] Preferably, the paraffin-based crude oil is selected from at least one of Russian blended crude oil ESPO and Angolan Cabinda crude oil.

[0027] A second aspect of the present invention provides a heavy-duty road asphalt, which is prepared by any of the methods described above.

[0028] The method provided by this invention blends de-oiled asphalt (a byproduct of propane deasphalting) and heavy-extracted oil (a byproduct of furfural refining) in a specific ratio according to this invention. This process produces heavy-duty road asphalt that meets the AH-70 or AH-90 specifications of GB / T15180-2010. It solves the problems of low utilization rate and low economic efficiency of byproducts from processing inferior crude oil and heavy fuel oil, increases the output of high-value heavy-duty road asphalt, and has good application prospects. Detailed Implementation

[0029] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0030] As previously stated, the first aspect of the present invention provides a method for preparing asphalt for heavy-duty roads and asphalt for heavy-duty roads.

[0031] To achieve the above objectives, the present invention provides a method for preparing asphalt for heavy-duty roads, comprising the following steps:

[0032] S1: Propane deasphalting is performed on crude oil to obtain de-oiled asphalt; and

[0033] The reduced fourth fraction oil was refined with furfural to obtain heavy extracted oil;

[0034] S2: The deoiled asphalt is blended with the re-extracted oil to obtain heavy-duty road asphalt;

[0035] In step S1, the crude oil comprises intermediate-based crude oil and paraffin-based crude oil, wherein the intermediate-based crude oil accounts for 70-99 parts by weight and the paraffin-based crude oil accounts for 1-30 parts by weight relative to 100 parts by weight of the crude oil.

[0036] In step S1, the conditions of the propane deasphalting treatment are controlled such that the wax content of the deoiled asphalt is not greater than 1.8 wt%, and the penetration of the deoiled asphalt is 25 1 / 10 mm to 45 1 / 10 mm; and the conditions of the furfural refining treatment are controlled such that the wax content of the re-extracted oil is not greater than 3.5 wt%, the saturated hydrocarbon content of the re-extracted oil is not greater than 10 wt%, and the aromatic hydrocarbon content is not less than 60 wt%.

[0037] In step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 70-90 parts by weight and the re-extracted oil accounts for 10-30 parts by weight.

[0038] It should be noted that, in this invention, the penetration is measured under conditions of 25°C, within 5 seconds, and 100 load.

[0039] The method provided by this invention blends de-oiled asphalt (a byproduct of propane deasphalting) and heavy-extracted oil (a byproduct of furfural refining) in a specific ratio according to this invention. This process produces heavy-duty road asphalt that meets the AH-70 or AH-90 specifications of GB / T15180-2010. It is suitable for refineries equipped with propane deasphalting and furfural units, solving the problems of low utilization rate and low economic efficiency of byproducts from processing inferior crude oil and heavy fuel oil. It increases the output of high-value heavy-duty road asphalt and has excellent application prospects.

[0040] According to some preferred embodiments of the present invention, in step S1, the furfural refining process includes:

[0041] S11: The reduced-four distillate oil and furfural are extracted in an extraction tower, wherein the reduced-four distillate oil is fed from the bottom of the extraction tower and the furfural is fed from the top of the extraction tower, and the feed weight ratio of the reduced-four distillate oil to the furfural is 1:(1.8-2.8).

[0042] S12: After the extracted oil produced at the bottom of the extraction tower is subjected to sedimentation treatment, the lower liquid is separated to obtain re-extracted oil.

[0043] The heavy-extracted oil obtained under these preferred conditions, when blended with de-oiled asphalt in subsequent processing, can produce heavy-duty road asphalt with superior performance in various aspects.

[0044] According to some particularly preferred embodiments of the present invention, in step S11, the top temperature of the extraction column is 123℃-127℃, the bottom temperature is 88℃-92℃, and the bottom pressure is 0.5MPa-0.9MPa.

[0045] According to some particularly preferred embodiments of the present invention, in step S12, the temperature of the settling treatment is 40℃-50℃, the pressure is 0.3MPa-0.8MPa, and the settling time is 15min-30min.

[0046] According to some preferred embodiments of the present invention, in step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 75-90 parts by weight and the re-extracted oil accounts for 10-25 parts by weight.

[0047] More preferably, the total weight of the deoiled bitumen and the heavy-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 77-80 parts by weight and the heavy-extracted oil accounts for 20-23 parts by weight. Under these preferred conditions, heavy-traffic road asphalt conforming to the AH-90 specification requirements of GB / T15180-2010 can be obtained.

[0048] According to some preferred embodiments of the present invention, in step S1, the conditions of the propane deasphalting treatment are controlled such that the softening point of the de-oiled asphalt is 50°C-65°C.

[0049] According to some preferred embodiments of the present invention, in step S1, the conditions of the propane deasphalting treatment are controlled such that the flash point of the de-oiled asphalt is not lower than 315°C. Under these preferred conditions, the heavy-traffic road asphalt obtained has better performance in various aspects.

[0050] According to some preferred embodiments of the present invention, in step S1, the conditions of the furfural refining treatment are controlled such that the flash point of the re-extracted oil is not lower than 240°C.

[0051] According to some preferred embodiments of the present invention, in step S1, the conditions of the furfural refining treatment are controlled such that the pour point of the re-extracted oil is not higher than 25°C.

[0052] According to some preferred embodiments of the present invention, in step S1, the conditions of the furfural refining treatment are controlled such that the initial boiling point of the re-extracted oil is not lower than 325°C.

[0053] According to some preferred embodiments of the present invention, in step S2, the temperature of the blending treatment is 120℃-140℃, and the blending time is 3min-10min.

[0054] According to some preferred embodiments of the present invention, the intermediate base crude oil is selected from at least one of Angolan Prutoni crude oil, Kaiserje crude oil, Saudi Arabian medium crude oil, Mahira crude oil, Hango crude oil, and Oman crude oil.

[0055] According to some preferred embodiments of the present invention, the paraffin-based crude oil is selected from at least one of Russian blended crude oil ESPO and Angolan Cabinda crude oil.

[0056] A second aspect of the present invention provides a heavy-duty road asphalt, which is prepared by any of the aforementioned methods and conforms to the requirements of AH-70 or AH-90 of GB / T15180-2010.

[0057] The present invention will be described in detail below through embodiments. In the following embodiments, each part by weight represents 1 kg.

[0058] Intermediate base crude oil:

[0059] Angolan Prutoni crude oil, Omani crude oil, and Saudi Arabian medium crude oil.

[0060] Paraffin-based crude oil:

[0061] Russian blended crude oil ESPO and Angolan Cabinda crude oil;

[0062] All of the crude oil mentioned above was purchased by China International Petroleum & Chemical Corporation.

[0063] Furfural, purchased from Pingquan Fengsheng Chemical Co., Ltd., with a purity >98.5%.

[0064] Crude Oil A: The total weight of Crude Oil A is 100 parts by weight, wherein Crude Oil A is composed of 25 parts by weight of Angolan Prutoni Crude Oil, 25 parts by weight of Omani Crude Oil, 25 parts by weight of Saudi Arabian Medium Crude Oil, and 25 parts by weight of Russian ESPO Blended Crude Oil.

[0065] Crude Oil B: The total weight of Crude Oil B is 100 parts by weight, wherein Crude Oil B is composed of 75 parts by weight of sand and 25 parts by weight of Cabinda.

[0066] Example 1

[0067] S1: Propane deasphalting is performed on crude oil to obtain de-oiled asphalt; and

[0068] The reduced fourth fraction oil was refined with furfural to obtain heavy extracted oil;

[0069] S2: The deoiled asphalt is blended with the re-extracted oil to obtain heavy-duty road asphalt;

[0070] In step S1, the crude oil is crude oil A;

[0071] In step S1, the conditions of the propane deasphalting treatment are controlled such that the wax content of the deoiled asphalt is 1.7 wt%; and the conditions of the furfural refining treatment are controlled such that the wax content of the re-extracted oil is 3.47 wt%, the saturated hydrocarbon content of the re-extracted oil is 7.46 wt%, and the aromatic hydrocarbon content is 65.49 wt%.

[0072] In step S2, the total weight of the deoiled bitumen and the re-extracted oil used in the blending process is 100 parts by weight, wherein the deoiled bitumen accounts for 82 parts by weight and the re-extracted oil accounts for 18 parts by weight.

[0073] In step S1, the furfural refining process includes:

[0074] S11: The reduced-four distillate oil and furfural are extracted in an extraction tower, wherein the reduced-four distillate oil is fed from the bottom of the extraction tower and the furfural is fed from the top of the extraction tower, and the feed weight ratio of the reduced-four distillate oil to the furfural is 1:2.

[0075] S12: After the extracted oil produced at the bottom of the extraction tower is subjected to sedimentation treatment, the lower liquid is separated to obtain re-extracted oil.

[0076] In step S11, the temperature at the top of the extraction column is 125°C, the temperature at the bottom of the column is 90°C, and the pressure at the bottom of the column is 0.7 MPa.

[0077] In step S12, the settling temperature is 45°C, the pressure is 0.5 MPa, and the settling time is 20 min.

[0078] In step S2, the temperature of the blending process is 130°C and the blending time is 5 min.

[0079] Specifically, the parameters in the preparation process are shown in Table 1 below, and the performance parameters of the prepared heavy-duty road asphalt are shown in Table 2 below.

[0080] Example 2

[0081] The process was carried out in a similar manner to Example 1, except that the ratio of deoiled bitumen to re-extracted oil in step S2 was adjusted.

[0082] Example 3

[0083] The process was carried out in a similar manner to Example 1, except that the ratio of deoiled bitumen to re-extracted oil in step S2 was adjusted.

[0084] Example 4

[0085] The procedure was carried out in a similar manner to Example 1, except that the type of crude oil was changed.

[0086] Example 5

[0087] The procedure is similar to that in Example 1, except that in step S1, the furfural refining process is performed as follows:

[0088] S11: The reduced-four distillate oil and the furfural are extracted in an extraction tower, wherein the reduced-four distillate oil is fed from the bottom of the extraction tower and the furfural is fed from the top of the extraction tower, and the feed weight ratio of the reduced-four distillate oil to the furfural is 1:1.

[0089] S12: After the extracted oil produced at the bottom of the extraction tower is subjected to sedimentation treatment, the lower liquid is separated to obtain re-extracted oil.

[0090] In step S11, the temperature at the top of the extraction column is 125°C, the temperature at the bottom of the column is 90°C, and the pressure at the bottom of the column is 0.7 MPa.

[0091] In step S12, the settling temperature is 45°C, the pressure is 0.5 MPa, and the settling time is 20 min.

[0092] Specifically, the parameters in the preparation process are shown in Table 1 below, and the performance parameters of the prepared heavy-duty road asphalt are shown in Table 2 below.

[0093] Comparative Example 1

[0094] The process was carried out in a similar manner to Example 1, except that the ratio of deoiled bitumen to re-extracted oil in step S2 was adjusted.

[0095] Table 1

[0096]

[0097]

[0098] Table 2

[0099]

[0100]

[0101] Table 2 (continued)

[0102]

[0103]

[0104] As can be seen from the results in Table 1, the method of this invention can produce heavy traffic road asphalt that meets the AH-70 or AH-90 specifications of GB / T15180-2010 by using deoiled asphalt and heavy extracted oil.

[0105] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing asphalt for heavy-duty roads, characterized in that, Includes the following steps: S1: The crude oil is subjected to propane deasphalting treatment to obtain deoiled asphalt; as well as The reduced fourth fraction oil was refined with furfural to obtain heavy extracted oil; S2: The deoiled asphalt is blended with the re-extracted oil to obtain heavy-duty road asphalt; In step S1, the crude oil comprises intermediate-based crude oil and paraffin-based crude oil, wherein the intermediate-based crude oil accounts for 70-99 parts by weight and the paraffin-based crude oil accounts for 1-30 parts by weight relative to 100 parts by weight of the crude oil. In step S1, the conditions of the propane deasphalting treatment are controlled such that the wax content of the de-oiled asphalt is no greater than 1.8 wt%, and the penetration of the de-oiled asphalt is 25 1 / 10 mm to 45 1 / 10 mm; and the conditions of the furfural refining treatment are controlled such that the wax content of the re-extracted oil is no greater than 3.5 wt%, the saturated hydrocarbon content of the re-extracted oil is no greater than 10 wt%, and the aromatic hydrocarbon content is no less than 60 wt%. In step S1, the furfural refining process includes: S11: The reduced-four distillate oil and furfural are extracted in an extraction tower, wherein the reduced-four distillate oil is fed from the bottom of the extraction tower and the furfural is fed from the top of the extraction tower, and the feed weight ratio of the reduced-four distillate oil to the furfural is 1:(1.8-2.8). S12: After the extracted oil produced at the bottom of the extraction tower is subjected to sedimentation treatment, the lower liquid is separated to obtain the heavy extracted oil. In step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 70-90 parts by weight and the re-extracted oil accounts for 10-30 parts by weight.

2. The method according to claim 1, characterized in that, In step S11, the top temperature of the extraction column is 123℃-127℃, the bottom temperature is 88℃-92℃, and the bottom pressure is 0.5MPa-0.9MPa.

3. The method according to claim 1, characterized in that, In step S12, the temperature of the sedimentation treatment is 40℃-50℃, the pressure is 0.3MPa-0.8MPa, and the sedimentation time is 15min-30min.

4. The method according to any one of claims 1-3, characterized in that, In step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 75-90 parts by weight and the re-extracted oil accounts for 10-25 parts by weight.

5. The method according to any one of claims 1-3, characterized in that, In step S2, the total weight of the deoiled bitumen and the re-extracted oil undergoing the blending treatment is 100 parts by weight, wherein the deoiled bitumen accounts for 77-80 parts by weight and the re-extracted oil accounts for 20-23 parts by weight.

6. The method according to any one of claims 1-3, characterized in that, In step S1, the conditions of the propane deasphalting treatment are controlled so that the softening point of the deoiled asphalt is 50℃-65℃.

7. The method according to any one of claims 1-3, characterized in that, In step S1, the conditions of the propane deasphalting treatment are controlled so that the flash point of the de-oiled asphalt is not lower than 315°C.

8. The method according to any one of claims 1-3, characterized in that, In step S1, the conditions of the furfural refining process are controlled so that the flash point of the re-extracted oil is not lower than 240°C.

9. The method according to any one of claims 1-3, characterized in that, In step S1, the conditions of the furfural refining process are controlled so that the pour point of the re-extracted oil is not higher than 25°C.

10. The method according to any one of claims 1-3, characterized in that, In step S1, the conditions of the furfural refining process are controlled so that the initial boiling point of the re-extracted oil is not lower than 325°C.

11. The method according to any one of claims 1-3, characterized in that, In step S2, the temperature of the blending treatment is 120℃-140℃, and the blending time is 3min-10min.

12. The method according to any one of claims 1-3, characterized in that, The intermediate base crude oil is selected from at least one of Angolan Prutoni crude oil, Kaiserje crude oil, Saudi Arabian medium crude oil, Mahira crude oil, Hango crude oil, and Oman crude oil.

13. The method according to any one of claims 1-3, characterized in that, The paraffin-based crude oil is selected from at least one of Russian blended crude oil ESPO and Angolan Cabinda crude oil.

14. An asphalt mixture for heavy-duty roads, characterized in that, It is prepared by the method described in any one of claims 1-13.

Images