KR101120509B1 - Manufacturing method of low penetration asphalt from light crude oil, and low penetration asphalt manufactured thereby - Google Patents

Abstract

PURPOSE: A producing method of asphalt having the penetration of 20-30 from light crude oil, and the asphalt are provided to enable users to easily produce the asphalt with the low penetration without a separate SDA-process. CONSTITUTION: A producing method of asphalt having the penetration of 20-30 from light crude oil comprises the following steps: distilling the light crude oil in a crude atmospheric distillation unit(VDU) to obtain atmospheric residue oil(VR); inserting the atmospheric residue oil into a solvent de-asphalting unit(SDA) to obtain a SDA-bottom; and mixing the SDA-bottom with the atmospheric residue oil to obtain asphalt having the penetration of 80-100; and reacting the asphalt with a composition containing lewis acid, a cross-linking agent, an adhesive force enhancer, and a dispersing agent at 130-190 deg C.

Description

Manufacturing method of low penetration asphalt from light crude oil, and low penetration asphalt manufactured accordingly

The present invention relates to a method capable of producing a large amount of asphalt having a low penetration of 20 to 80 from light crude oil in bulk without additionally establishing a SDA-process and to the asphalt produced thereby.

Penetration No. is the value measured by the unit of 100g of the load at 25 ° C and inserted into the asphalt sample for 5 seconds, expressed in 10 times the number, and is generally an important quality standard for road paving asphalt. As one shows the quality grade of asphalt.

Depending on the application site, asphalt of appropriate penetration is used, but high quality hard asphalt with low penetration is increasingly required worldwide, and asphalt having low penetration of 20-40 is required in Europe.

However, most of the oil refiners in the Middle East, which export asphalt to Europe, produce soft asphalt with an invasion rate of 80 to 100. As a result, oil refiners in the Middle East are required to meet the asphalt specifications in Europe. Wax-based additives are added to the modified asphalt to improve softening point and penetration. However, such additives such as wax not only lowers the low temperature physical properties of the asphalt, but also has a problem of being expensive.

On the other hand, the most common asphalt production method is to use the reduced pressure residues from the crude oil is introduced into the atmospheric distillation tower and the atmospheric residues from the back to the reduced pressure distillation tower as a final asphalt. At this time, the decompression residue produced in heavy crude oil can be used as paving asphalt as it is excellent in asphalt quality, while the decompression residue produced from light crude oil is too soft for road paving. Asphalt is difficult to use.

However, since heavy crude oil contains a lot of heavy metals and acts as a catalyst poison, refiners prefer light crude oil to heavy crude oil. In this case, refiners mainly using light crude oil make it difficult to produce asphalt and thus use additional processes.

That is, in the oil refinery, the depressurized residue oil was further passed through a solvent deasphalting unit (SDA) to obtain an SDA-bottom from which oil was removed, and then the depressurized glass introduced into the SDA-bottom and feed. Asphalt is prepared by remixing the reasons in an appropriate proportion, and this additional process significantly improves the penetration and softening point of the asphalt.

However, in this case, the amount of asphalt is determined according to the amount of SDA-bottom, and in order to increase the amount of asphalt, the additional SDA-process must be newly added.

On the other hand, asphalt manufacturing through the SDA process is mentioned in some patents as a method commonly used in refiners using light crude oil as mentioned above (Korean Patent Publication 10-2007-0010828). However, the above-mentioned patent discloses SDA glass by mixing all of atmospheric pressure residue (AR), heavy pressure gas oil (HCVGO), slurry oil (Slurry-Oil), etc., instead of using vacuum residue (VR) as feed of the SDA process. Making a reason, and re-combining the reduced-pressure residue oil to the SDA residue oil thus produced is producing asphalt.

However, the production method as described above has a disadvantage in that the process becomes very complicated as the feed of the SDA process is fed not only a vacuum residue oil but also various types of feeds such as atmospheric residue oil, heavy pressure gas oil, slurry oil, etc. And to supplement the low temperature elongation quality of the asphalt by the introduction of high waxy crude (high waxy crude), the object and approach to achieve the present invention is different.

In addition, some attempts to convert asphalt quality by chemical additives or polymers have been reported in the patent. In some cases, polymer modified asphalt is prepared by adding a polymer to asphalt and using an inorganic acid and a binder. (Korean Patent Publication 10-2007-0083767). However, the above patents have the disadvantages such as the manufacture of polymer modified asphalt using a polymer or the quality conversion by using a large amount of additives, such as an excessive increase in manufacturing cost due to the use of a polymer or an additive, and an object of the present invention. It is different from, and the effect is also different.

In contrast, the present invention relates to a method for producing a large amount of asphalt without the addition of a new process of making a low-quality asphalt from the hard crude oil that can not produce road paving asphalt and enormous cost.

In other words, in the present invention, using light crude oil that cannot produce asphalt for road pavement, using SDA-bottom in the reduced pressure residual oil instead of using the reduced pressure residual oil to make the low-quality (soft) intrusion 80 to 100 as much as possible, after A small amount of composition containing Lewis acid is used to convert the high quality (hard) penetration into 20 to 80 asphalt. In addition, the present invention relates to a method in which the quality of asphalt is also improved by converting asphalt using a small amount of a composition of a composite component other than a single component.

In this case, it is possible to use light crude oil, thus widening the crude oil option, and it is possible to produce high-quality asphalt without adding additional process, thereby saving enormous process construction cost and increasing the production of high-quality asphalt by 40 ~ 60% by using small amount of the composition. As a result, the oil refiner's profitability can be greatly improved.

It is an object of the present invention to provide a method for easily producing large amounts of low-invasive asphalt from light crude oil and the asphalt produced thereby, without further establishing an SDA-process.

In order to achieve the object as described above, the present invention comprises the following steps: i) distilling light crude oil in a CDU to obtain atmospheric residue oil (AR), ii) distilling the atmospheric residue oil (AR) under reduced pressure distillation column (VDU) Obtaining distilled residue (VR) by distillation at iv) distilling under reduced pressure (VR) into the solvent deasphalting process (SDA) to obtain SDA-bottom, iii) the SDA-bottom and decompressed residue oil (VR) mixing to prepare an asphalt having a penetration of 80 to 100, and iii) a Lewis acid having a melting temperature of 50 to 130 ° C. and a molecular weight of 80 to 300 90 to 95 w%, a crosslinking agent of 4 to 9.8 w%, and an adhesive force. Asphalt with a penetration of 20 to 80 from light crude oil, comprising the step of reacting the composition containing 0.1 to 1% by weight of the enhancer, and 0.1 to 1% by weight of the dispersant at a temperature of 130 to 190 ° C It provides a method of manufacturing.

In this case, the composition may be mixed after the atmospheric distillation step, the vacuum distillation step or the solvent deasphalting process step, the Lewis acid preferably has one or more functional groups of sulfonyl group, phosphoric acid group, carboxyl group.

In addition, the crosslinking agent comprises sulfur, the adhesion promoter comprises a phenol formaldehyde resin, the dispersing agent preferably comprises a metal stearate.

On the other hand, the content of the composition may be 0.3 ~ 1.0 w% with respect to 100 parts by weight of the asphalt, wherein the mixing volume ratio of the SDA-bottom and reduced pressure residue (VR) is 1: 4 ~ 1: 6, the composition It is characterized in that the penetration of the asphalt produced by reaction with 60 ~ 80.

And wherein the composition is in the form of a powder prepared by i) mixing a Lewis acid, a crosslinking agent, an adhesion promoter and a dispersant, and ii) grinding the mass formed by heating the mixture to 60-80 ° C., or i) Mixing a Lewis acid, a crosslinking agent, an adhesion promoter and a dispersant, ii) mixing the mixture in a weight ratio of high boiling point polyhydric alcohol having a boiling point of 150 ° C. or higher at a ratio of 1: 1 to 3: 1 (additive mixture: polyhydric alcohol) , And iii) a composition in the form of a solution prepared by heating the mixture to 50 to 150 ° C., preferably the composition is in a weight ratio of 1: 1 to 2: 1 in powder form and solution form. It may be mixed for 30 minutes to 1 hour at 50 ~ 150 ℃.

On the other hand, in order to achieve the object as described above, the present invention is i) reduced pressure residue (VR), ii) SDA-bottom, and iii) Lewis acid 90 ~ ~ melt temperature is 50 ~ 130 ℃ and molecular weight 80 ~ 300 It provides an asphalt having a penetration of 20 to 80 prepared from light crude oil comprising a composition consisting of 95w%, crosslinking agent 4 ~ 9.8w%, adhesion promoter 0.1 ~ 1w%, and dispersant 0.1 ~ 1w%.

At this time, the mixed volume ratio of the SDA-bottom and the vacuum residue (VR) is 1: 4 to 1: 6, characterized in that the penetration of the asphalt made by reacting with the composition is 60 ~ 80.

Asphalt manufacturing method proposed in the present invention can easily produce a large amount of low-invasive asphalt from light crude oil, without the addition of additional SDA-process. In other words, it is possible to produce a large amount of asphalt with high penetration while reducing the amount of SDA-bottom used as much as possible, thereby significantly reducing the production cost.

1 is a simplified process diagram of the asphalt manufacturing method of the present invention.
CDU: Crude Atmospheric Distillation Unit Atmospheric Distillation Process
VDU: Vacuum Distillation Unit: Vacuum Distillation Process
SDA: Solvent De-Asphating Unit Solvent Deasphalting Process
AR: Atmospheric Residue
VR: Vacuum Residue
DAO: De-Asphalted Oil Deasphalted Oil

With reference to the accompanying drawings, a method for producing asphalt having an infiltration degree of 20 to 80 from the light crude oil according to the present invention and the asphalt thus produced will be described in detail below.

Asphalt manufacturing method proposed in the present invention as shown in Figure 1 i) distilling the light crude oil in an atmospheric distillation column (CDU) to obtain an atmospheric residual oil (AR), ii) reducing the atmospheric residue oil (AR) Distillation in a distillation column (VDU) to obtain a vacuum residue (VR), i) adding the vacuum residue (VR) to a solvent deasphalting process (SDA) to obtain an SDA-bottom, i) the SDA-bottom And a step of preparing asphalt having an infiltration degree of 80 to 100 by mixing with vacuum residue (VR), and iii) 90 to 95 w% of Lewis acid having a melting temperature of 50 to 130 ° C. and a molecular weight of 80 to 300, and a crosslinking agent of 4 to 9.8. reacting the composition containing w%, the adhesion promoter 0.1-1w%, and the dispersant 0.1-1w% with the asphalt having a penetration of 80-100.

As mentioned above, the vacuum residue produced from light crude is too soft to be used as asphalt. Therefore, in general, the refinery additionally passes the reduced-pressure residue oil through the solvent deasphalting process (SDA) to obtain the SDA-bottom from which the oil is removed, and then, the appropriate ratio of the reduced-pressure residue oil introduced into the feed and the SDA-bottom is supplied. Asphalt is manufactured by lowering the penetration to less than 80 by mixing.

In general, in order to lower the soft decompression residue to 60-80, the SDA-bottom and the decompression residue should be mixed at a volume ratio of about 1: 2 to 1: 3. Therefore, the amount of asphalt produced is determined according to the amount of SDA-bottom, and in order to increase the amount of asphalt produced, an additional SDA-process must be established.

In the present invention, in order to produce a large amount of low infiltration asphalt having a penetration level of 20 to 80 without additionally establishing an SDA-process, an infiltration degree of 80 to 100 manufactured by mixing SDA-bottom and vacuum residue (VR) Asphalt is reacted with a composition consisting of Lewis acid, crosslinker, adhesion promoter and dispersant.

At this time, the composition may be mixed after the production of asphalt of penetration 80 ~ 100 as shown in Figure 1, it may be mixed after the atmospheric distillation step, the vacuum distillation step or the solvent deasphalting process step.

In addition, the content of the composition is that the melting temperature is 50 ~ 130 ℃ and molecular weight of 80 ~ 300 Lewis acid 90 ~ 95w%, crosslinking agent 4 ~ 9.8w%, adhesion promoter 0.1 ~ 1w%, and dispersant 0.1 ~ 1w% Preferably, while maximizing the effect of reducing the penetration of asphalt within the above content range, physical properties such as low temperature resistance can be kept high to meet the asphalt specifications.

The Lewis acid preferably has one or more functional groups of benzenesulfonic acid, paratoluene sulfonic acid, sulfonyl groups such as sulfamic acid, phosphoric acid groups such as phosphorous acid, and carboxyl groups such as stearic acid, maleic acid and picolinic acid.

In addition, sulfur may be used as the crosslinking agent, and phenol formaldehyde resins such as novolac or resol having excellent heat resistance, cold resistance, mechanical and chemical properties, and strong adhesion may be used as the adhesion promoter. The dispersant is to help the composition to be evenly dispersed in the asphalt, it may be used a metal stearate such as zinc stearate or calcium stearate.

The reaction between the asphalt and the composition of the SDA-bottom and reduced-pressure residue oil (VR) is preferably carried out at a temperature of 130 ~ 190 ℃, if the acid melting temperature and molecular weight are in the above range, respectively, the acid The electron can be given while being melted so that the reaction can be made smoothly.

According to the content of the composition of the asphalt, the penetration of asphalt can be controlled in various ways, and as the content of the composition is increased, the penetration of asphalt can be further lowered.

As an embodiment of the present invention, when using the content of the composition 0.3 to 1.0 w% with respect to 100 parts by weight of asphalt, the softening point is 44 ~ 42 ~ 50 ℃ while lowering the penetration from 80 to 100 to 60 to 80 It can raise to 52 degreeC.

In this case, the mixing volume ratio of the SDA-bottom and the vacuum residue (VR) is 1: 4 to 1: 6 instead of 1: 2 to 1: 3, so that the existing SDA-process does not need to be newly established. Alone can increase asphalt production by 40-60%.

On the other hand, the composition may be in the form of a powder or a solution form.

The composition in powder form may be prepared by i) mixing Lewis acid, crosslinking agent, adhesion promoter and dispersant, and ii) pulverizing the mass formed by heating the mixture to 60-80 ° C.

In addition, the composition in the form of a solution comprises i) mixing a Lewis acid, a crosslinking agent, an adhesion promoter and a dispersant, ii) mixing the mixture with a high boiling point polyhydric alcohol having a boiling point of 150 ° C. or higher at 1: 1 to 3: 1 (additive mixture: Polyhydric alcohol) may be prepared by mixing in a weight ratio, preferably in a ratio of 1: 1 to 2: 1, and iii) heating the mixture to 50 to 150 ° C.

In this case, the high boiling point polyhydric alcohol may be used such as monoethylene glycol, diethylene glycol, triethylene glycol or a combination thereof, at least one of the components of the composition is dissolved in the high boiling point polyhydric alcohol.

Preferably, when using a composition in which the powder form and the solution form are mixed at a weight ratio of 1: 1 to 2: 1 at 50 to 150 ° C. for 30 minutes to 1 hour, SDA-bottom and vacuum residue (VR) The effect of reaction with the mixed asphalt can be maximized.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[ Examples 1-5 ]

In the reactor maintained at a temperature of 150 ℃, 99.5 parts by weight of asphalt mixed with SDA-bottom having a penetration of 91 and a softening point of 46 ℃ and reduced pressure residue (VR) and 0.5 parts by weight of the composition having the composition shown in Table 1 And stirred at 150 ° C. for 1 h.

Comparative Example 1

100 parts by weight of asphalt mixed with SDA-bottom and vacuum residue (VR) were treated in the same manner as in Examples 1 to 5.

Composition of Additive Composition (parts by weight) Benzenesulfonic Acid sulfur Novolac resin zinc
Stearate Example 1 90 9.5 0.25 0.25 Example 2 95 4.8 0.1 0.1 Example 3 80 17 1.5 1.5 Example 4 85 13 0.5 0.5 Example 5 97 2.9 0.05 0.05 Comparative Example 1 0 0 0 0

Evaluation Example 1

In Examples 1 to 5 and Comparative Example 1, samples were taken at 10, 30, and 60 minutes after the start of stirring, respectively, and the penetration of the treated asphalt, the softening point, and the viscosity were measured. 2 is shown.

At this time, the penetration was measured the penetration of each sample according to KS M 2252 (25 ℃, 100g, 5 seconds), the softening point was measured the softening point of each sample according to KS M 2250, the viscosity is KS M 2292 (135 degreeC), respectively.

division Trespassing Softening point (℃) Viscosity (cp) 10 minutes 30 minutes 60 minutes 10 minutes 30 minutes 60 minutes 10 minutes 30 minutes 60 minutes Example 1 77 77 77 48 48 48 85 85 85 Example 2 73 73 73 51 51 51 89 89 89 Example 3 87 87 87 46 46 46 79 82 82 Example 4 83 83 83 47 47 47 83 83 83 Example 5 68 63 59 50 52 53 87 89 89 Comparative Example 1 91 91 91 46 46 46 80 80 80

As can be seen in Table 2, each of the treated asphalt of Examples 1 to 5 has a low penetration and the softening point is the same or higher than the treated asphalt of Comparative Example 1. In particular, the asphalt of Examples 1 to 2 was found to satisfy both the invasiveness standard (ie, 60 ~ 80) and softening point specifications (ie, 44 ~ 52 ℃) of the domestic road paving asphalt.

Evaluation Example 2

The mechanical properties and aging resistance of the treated asphalt of Example 2 were evaluated in the following manner, and the results are shown in Table 3 below, in terms of penetration of domestic asphalt (ie, 60 to 80) and softening point specifications (ie, 44). ˜52 ° C.).

(Mechanical property evaluation)

(1) Dynamic Shear Stress of Raw Material: The dynamic shear stress (G * / sinδ) of the treated asphalt was measured according to the American Association of State Highway and Transportation Officials (AASHTO) TP5 using a Dynamic Shear Rheometer (DSR). Where G * is the complex shear modulus and δ is the phase angle. G * / sinδ also simulates resistance to plastic deformation (permanent deformation) and fatigue cracking (structural cracking).

 (2) Dynamic Shear Stress After Rotary Thin Film Oven Test: After performing the rotary thin film oven test on the treated asphalt according to AASHTO TP240 using a rolling thin film oven (RTFO), the treatment was completed. The dynamic shear stress (RTFO_G * / sinδ) of asphalt was measured according to AASHTO TP5 using DSR. Here, RTFO_G * / sin delta simulates the aging state generated during ascon production and laying.

(Aging resistance evaluation)

(1) Dynamic Shear Stress After High Pressure Aging Test: After performing the rotating thin film heating test according to AASHTO TP240 using the rotating thin film oven on the treated asphalt (i.e. raw material), the treated asphalt was tested. A pressure aging vessel (PAV) was used to perform high pressure aging tests in accordance with AASHTO PP1.

Thereafter, the dynamic shear stress (PAV_G * Xsinδ) of the treated asphalt after the high pressure aging test was measured according to AASHTO TP5 using DSR. Here, PAV_G * Xsinδ simulates the aging state 10 years after the treated asphalt is constructed on the road.

(2) Flexural characteristics after high pressure aging test: After performing the rotary thin film heating test according to AASHTO TP240 using a rotary thin film oven on the treated asphalt (ie raw material), the pressure was applied to the treated asphalt after the test. A pressure aging vessel (PAV) was used to perform high pressure aging tests in accordance with AASHTO PP1.

Then, the bending characteristics (CS (t) and m-value) of the treated asphalt after the high pressure aging test were measured according to AASHTO T313-08 using a bending beam rheometer (BBR). Where CS (t) is the flexural creep stiffness and simulates asphalt stiffness at low temperatures, and m-value is the flexural creep stiffness (CS (t) vs. log t (log CS (t) vs. log t)). The absolute value of the slope of t)) is used to simulate the sudden brittle fracture. Here, t means time.

division Dynamic Shear Stress (KPa) Flexural characteristics G * / sinδ RTFO_G * / sinδ PAV_G * Xsinδ C.S (t) (MPa) m-value 1.00 or more 2.20 or more Less than 5000 300 or less 0.3 or more Temperature 64 ℃ 1.22 2.23 - - - 70 ℃ 0.57 1.01 - - - 19 ℃ - - 5870 - - 22 ℃ - - 4080 - - -12 ℃ - - - 171 0.339

As can be seen in Table 3, the treated asphalt of Example 2 was found to satisfy the penetration 60 ~ 80 asphalt specifications.

Evaluation Example 3

The storage stability of the treated asphalt of Example 2 was evaluated, and the evaluation results are shown in Table 4 below. Specifically, while maintaining the treated asphalt of Example 2 in an oven maintained at a temperature of 150 ℃ for 7 days, the daily penetration and softening point was evaluated according to KS M 2252 and KS M 2250, respectively.

division Retention days 1 day 2 days 3 days 4 days 5 days 6 days 7 days Trespassing 73 73 74 73 73 74 73 Softening Point (℃) 50 51 51 50 51 51 51 Domestic asphalt standard
(Infiltration degree: 60 ~ 80, Softening point: 44 ~ 52 ℃) satisfied satisfied satisfied satisfied satisfied satisfied satisfied

As can be seen in Table 4, it can be seen that the treated asphalt of Example 2 satisfies the domestic asphalt specification even if it is stored for a long period of 7 days.

The present invention is not limited to the above-described specific configurations and examples of use, and various modifications can be made by those skilled in the art without departing from the spirit of the invention as claimed in the claims. It is possible for such modifications to fall within the protection scope of the present invention.

Claims (13)

i) distilling the light crude oil in a Crude Atmospheric Distillation Unit (CDU) to obtain an Atmospheric Residue (AR);
Ii) distilling the atmospheric residual oil (AR) in a vacuum distillation unit (VDU) to obtain a vacuum residual oil (Vacuum Residue, VR);
Iii) obtaining the SDA-bottom by introducing the vacuum residue oil (VR) into a solvent deasphalting unit (SDA);
Iii) mixing the SDA-bottom and reduced-pressure residue oil (VR) to produce asphalt having a penetration rate of 80 to 100; And
Iii) invading the composition containing 90-95 w% of a Lewis acid having a melting temperature of 50-130 ° C. and a molecular weight of 80-300, 4-9.8 w% of a crosslinking agent, 0.1-1 w% of an adhesion promoter, and 0.1-1 w% of a dispersant. Reaction with the asphalt of Figures 80 ~ 100 at a temperature of 130 ~ 190 ℃;
Method of producing asphalt of penetration 20 ~ 80 from light crude oil comprising a.
The method of claim 1,
And the composition is mixed after the atmospheric distillation step, the vacuum distillation step or the solvent deasphalting process step.
delete The method of claim 1,
Wherein said Lewis acid has at least one functional group of a sulfonyl group, a phosphoric acid group, and a carboxyl group.
The method of claim 1,
Wherein said crosslinking agent comprises sulfur, said adhesion promoter comprises a phenol formaldehyde resin, and said dispersing agent comprises a metal stearate.
The method of claim 1,
Method for producing asphalt with a penetration of 20 to 80 from light crude oil, characterized in that the content of the composition is 0.3 ~ 1.0w% based on 100 parts by weight of the asphalt.
The method of claim 6,
The mixing volume ratio of the SDA-bottom and the reduced-pressure residue oil (VR) is 1: 4 to 1: 6, and the infiltration degree from light crude oil is 20 to 80, characterized in that the penetration of the asphalt reacted with the composition is 60 to 80. Method of manufacturing asphalt.
The composition of claim 1 wherein the composition is
i) mixing the Lewis acid, crosslinker, adhesion promoter and dispersant; And
Ii) grinding the formed mass by heating the mixture to 60-80 ° C;
Method for producing an asphalt having a penetration of 20 to 80 from light crude oil, characterized in that the composition of the powder form prepared through.
The composition of claim 1 wherein the composition is
i) mixing the Lewis acid, crosslinker, adhesion promoter and dispersant;
Ii) mixing the mixture in a weight ratio of high boiling point polyhydric alcohol having a boiling point of 150 ° C. or higher and 1: 1 to 3: 1 (additive mixture: polyhydric alcohol); And
Iii) heating the mixture to 50-150 ° C .;
Method of producing asphalt of penetration 20 ~ 80 from light crude oil, characterized in that the composition in the form of a solution prepared through.
10. The method according to claim 8 or 9, wherein the composition is infiltrated from light crude oil, characterized in that the powder form and the solution form is mixed at 50 ~ 150 ℃ 30 minutes to 1 hour in a weight ratio of 1: 1 to 2: 1. 20-80 method of producing asphalt.
i) vacuum residue (VR), ii) SDA-bottom, and iii) Lewis acid 90 ~ 95w%, crosslinking agent 4 ~ 9.8w%, adhesion promoter 0.1 ~ with melting temperature 50 ~ 130 ℃ and molecular weight 80 ~ 300 Asphalt with a penetration of 20 to 80 produced from light crude oil, characterized in that it comprises a composition consisting of 1w%, and 0.1-1w% dispersant.
delete The method of claim 11,
Asphalt with a penetration of 20 to 80 prepared from light crude oil, characterized in that the mixing volume ratio of the SDA-bottom and the vacuum residue (VR) is 1: 4 ~ 1: 6, the penetration is 60 ~ 80.

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