CN112574580B

CN112574580B - Method and device for preparing modified asphalt

Info

Publication number: CN112574580B
Application number: CN201910939496.1A
Authority: CN
Inventors: 李剑新; 李青松; 李雨师; 黄小侨; 周赛赛; 邵子奇; 徐晓胜; 张超; 杨飞燕; 王利平
Original assignee: Petrochina Co Ltd; China University of Petroleum East China; Petrochina Fuel Oil Co Ltd
Current assignee: Petrochina Co Ltd; China University of Petroleum East China; Petrochina Fuel Oil Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2022-10-04
Anticipated expiration: 2039-09-30
Also published as: CN112574580A

Abstract

The invention discloses a method and a device for preparing modified asphalt, and belongs to the technical field of asphalt preparation. The modifier can polymerize organic micromolecule substances in the catalytic slurry oil into oligomer by mixing the modifier with oxidability with the catalytic slurry oil and carrying out constant-temperature heat treatment on the uniformly mixed modifier and the catalytic slurry oil, so that the modified slurry oil with higher oligomer content is obtained. Blending the modified oil slurry with deoiled asphalt, and blending the obtained blended asphalt with styrene butadiene rubber to obtain the modified asphalt. The modified asphalt has high oligomer content, so the modified asphalt has high softening point and ageing resistance, and the road paved by the modified asphalt is not easy to crack and has good weather resistance.

Description

Method and device for preparing modified asphalt

Technical Field

The disclosure relates to the technical field of asphalt preparation, in particular to a method and a device for preparing modified asphalt.

Background

In road paving, it is necessary to use large amounts of asphalt as the road surfacing material. At present, crude oil in China is mostly paraffin-based crude oil, and asphalt obtained from the paraffin-based crude oil is generally required to be modified so as to prepare modified asphalt meeting the road paving requirement.

The modified asphalt commonly used at present is prepared from deoiled asphalt, catalytic slurry oil and additives, and the preparation process comprises the following steps: mixing the deoiled asphalt with the catalytic slurry oil for heat treatment, and adding a polymer modifier to obtain modified asphalt containing a polymer component.

In the preparation process of the modified asphalt, the catalytic slurry oil is the slurry oil obtained by the outward throwing of crude oil through a catalytic cracking device, so that the content of organic micromolecule substances in the catalytic slurry oil is very high, the melting point of the organic micromolecule substances is lower, the modified asphalt has lower softening point and poor ageing resistance, and roads paved by using the asphalt are easy to crack.

Disclosure of Invention

The embodiment of the disclosure provides a method and a device for preparing modified asphalt, which can solve the problems of low softening point and poor aging resistance of the modified asphalt prepared by the conventional technology. The technical scheme is as follows:

in one aspect, a method for preparing modified asphalt is provided, the method comprising:

mixing catalytic slurry oil and a modifier to obtain a first mixture, wherein the catalytic slurry oil comprises at least one of external throwing slurry oil and distillate oil generated in a catalytic cracking process, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture, the external throwing slurry oil and the distillate oil both contain organic micromolecule substances, and the modifier is used for polymerizing the organic micromolecule substances in the catalytic slurry oil into oligomer;

stirring the first mixture to uniformly mix the catalytic slurry oil and the modifier;

maintaining the temperature of the first mixture at a preset constant temperature for a preset time period of 0.1-240 h and 50-450 ℃ to react the catalytic slurry oil with the modifier to obtain modified slurry oil;

blending the modified oil slurry with the deoiled asphalt to obtain blended asphalt, wherein the mass ratio of the modified oil slurry to the deoiled asphalt is 1:9-9:1, the temperature in the blending process is 50-450 ℃, and the time duration of the blending process is 0.1-240 h;

mixing styrene-butadiene rubber and the blended asphalt to obtain a second mixture, wherein the mass of the styrene-butadiene rubber accounts for 0.1-20% of that of the second mixture;

and stirring the second mixture to obtain the modified asphalt.

In one possible implementation, the modifier comprises: at least one of a peroxide modifier, a sulfur and sulfide modifier, and a metal oxide.

In one possible implementation mode, when the modifier is a solid, the mass of the modifier accounts for 0.1 to 0.5 percent of the mass of the first mixture.

In one possible implementation mode, when the modifier is a solution, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture.

In one possible implementation, the deoiled asphalt comprises: at least one of deoiled asphalt obtained by propane deasphalting, deoiled asphalt obtained by butane deasphalting, deoiled asphalt obtained by pentane deasphalting and deoiled asphalt obtained by mixed solvent deasphalting.

In another aspect, there is provided an apparatus for preparing modified asphalt, the apparatus comprising:

the first mixing module is used for mixing catalytic slurry oil and a modifier to obtain a first mixture, wherein the catalytic slurry oil comprises at least one of external throwing slurry oil and distillate oil generated in a catalytic cracking process, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture, the external throwing slurry oil and the distillate oil both contain organic micromolecule substances, and the modifier is used for polymerizing the organic micromolecule substances in the catalytic slurry oil into oligomers;

the first stirring module is used for stirring the first mixture to uniformly mix the catalytic slurry oil and the modifier;

the constant-temperature heat treatment module is used for maintaining the temperature of the first mixture to be a preset constant temperature within a preset time period, the preset time period is 0.1-240 h, the preset constant temperature is 50-450 ℃, and the catalytic slurry oil and the modifier are reacted to obtain modified slurry oil;

the blending module is used for blending the modified slurry oil and the deoiled asphalt to obtain blended asphalt, the mass ratio of the modified slurry oil to the deoiled asphalt is 1:9-9:1, the temperature in the blending process is 50-450 ℃, and the duration of the blending process is 0.1-240 h;

the second mixing module is used for mixing the styrene-butadiene rubber and the blended asphalt to obtain a second mixture, wherein the mass of the styrene-butadiene rubber accounts for 0.1-20% of that of the second mixture;

and the second stirring module is used for stirring the second mixture to obtain the modified asphalt.

In a possible implementation mode, when the modifier is a solid, the mass of the modifier accounts for 0.1 to 0.5 percent of the mass of the first mixture.

The modifier can polymerize organic micromolecule substances in the catalytic slurry oil into oligomer by mixing the modifier with oxidability with the catalytic slurry oil and carrying out constant-temperature heat treatment on the uniformly mixed modifier and the catalytic slurry oil, so that the modified slurry oil with higher oligomer content is obtained. Blending the modified slurry oil with deoiled asphalt, and blending the obtained blended asphalt with styrene butadiene rubber to obtain the modified asphalt. The modified asphalt has high oligomer content, so the modified asphalt has high softening point and ageing resistance, and the road paved by the modified asphalt is not easy to crack and has good weather resistance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method of preparing modified asphalt provided by an embodiment of the present disclosure;

FIG. 2 is a flow chart of a method of preparing modified asphalt provided by an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an apparatus for preparing modified asphalt according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a computer device provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flow chart of a method for preparing modified asphalt provided by embodiments of the present disclosure. Referring to fig. 1, the method for preparing modified asphalt may be applied to a computer apparatus, the method comprising:

101. the catalytic slurry oil and the modifier are mixed to obtain a first mixture.

The catalytic slurry oil comprises at least one of external throwing slurry oil and distillate oil generated in a catalytic cracking process, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture, the external throwing slurry oil and the distillate oil both contain organic micromolecular substances, and the modifier is used for polymerizing the organic micromolecular substances in the catalytic slurry oil into oligomers.

102. And stirring the first mixture to uniformly mix the catalytic slurry oil and the modifier.

103. Maintaining the temperature of the first mixture at a predetermined constant temperature for a predetermined period of time.

The preset time is 0.1 h-240 h, the preset constant temperature is 50 ℃ -450 ℃, and the catalytic slurry oil and the modifier are reacted to obtain the modified slurry oil.

104. And blending the modified oil slurry with the deoiled asphalt to obtain blended asphalt.

Wherein the mass ratio of the modified slurry oil to the deoiled asphalt is 1:9-9:1, the temperature of the blending process is 50-450 ℃, and the time length of the blending process is 0.1-240 h.

105. And mixing the styrene butadiene rubber and the blended asphalt to obtain a second mixture.

Wherein the mass of the styrene butadiene rubber accounts for 0.1-20% of the mass of the second mixture.

106. And stirring the second mixture to obtain the modified asphalt.

Fig. 2 is a flow chart of a method for preparing modified asphalt provided by the embodiments of the present disclosure. Referring to fig. 2, the method for preparing modified asphalt may be applied to a computer apparatus, the method comprising:

201. the catalytic slurry oil and the modifier are mixed to obtain a first mixture.

Specifically, the catalytic slurry oil is a byproduct after the catalytic cracking treatment of crude oil. The external throwing oil slurry refers to: in order to maintain a constant liquid level in a control tower of the catalytic cracking process or to increase the processing amount, a part of the oil slurry is thrown out from the oil slurry component at the bottom of the fractionating tower. The distillate oil refers to: the components with a certain distillation range (boiling point range) separated in the distillation of crude oil, such as liquefied gas, gasoline, kerosene, diesel oil and other fractions. The external throwing oil slurry and the distillate oil both contain more organic micromolecular substances. The organic micromolecule substances have small molecular weight, and intermolecular force among the organic micromolecule substances is weak, so that the organic micromolecule substances have low melting points and are volatile. The asphalt can flow and volatilize at normal temperature, so that the modified asphalt directly prepared by the catalytic slurry oil without modification in the prior art has lower softening point and ageing resistance.

The modifier has strong oxidizability, can be oxidized and polymerized with catalytic slurry oil, and can polymerize small organic molecules in the catalytic slurry oil into oligomers. The obtained modified oil slurry has the characteristic of high oligomer content. The molecular weight of the oligomer in the modified slurry oil is large, and the entanglement among the oligomers increases the acting force among the molecules of the oligomer, so that the modified slurry oil has higher melting point and is not easy to volatilize. Therefore, the modified oil slurry has higher softening point and ageing resistance.

Furthermore, the catalytic slurry oil also contains wax, the wax is an organic compound with a large molecular weight, the intermolecular action force of the wax molecules is weak, and slippage is easy to occur, so that the wax has low viscosity and lubricating effect on a macroscopic scale, and the softening temperature is very low. The viscosity of organic micromolecule substances (such as heptane, octane, ethylene and the like) in the catalytic slurry oil is also very small, and the lubricating effect of wax and the low viscosity of the organic micromolecule substances cause that the modified asphalt directly prepared from the catalytic slurry oil in the prior art is poor in adhesive property without modification.

The modifier has strong oxidizability and can perform oxidation reaction with the catalytic slurry oil, and the modifier can also oxidize wax in the catalytic slurry oil, so that the obtained modified slurry oil has the characteristic of low wax content. Therefore, the modified oil slurry has low lubricity and high adhesion performance, so that the prepared modified asphalt has high adhesion performance.

In one possible implementation, the modifier comprises: at least one of peroxide modifier, sulfur and sulfide modifier, and metal oxide.

The peroxide modifier, the sulfur and sulfide modifier and the metal oxide have moderate oxidizability, can ensure that organic micromolecule substances generate certain polymerization reaction to form oligomer, cannot be over polymerized into high molecules, keeps the fluidity of the modified oil slurry, and improves the adhesion performance of the modified oil slurry.

In order to sufficiently modify the catalytic slurry oil with the modifier, the modifier needs to be uniformly dispersed in the catalytic slurry oil so that the modification reaction of the catalytic slurry oil is uniformly and sufficiently performed, and when the catalytic slurry oil generated in various crude oil treatment processes is treated, the modifier needs to be added to the catalytic slurry oil in a solid or solution manner according to the viscosity degree of the catalytic slurry oil so as to ensure that the modification reaction of the catalytic slurry oil is performed to a required degree, and the following two cases are taken as examples.

First, when the modifier is solid, the mass of the modifier accounts for 0.1-0.5% of the mass of the first mixture. As an example, it may be: 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%, etc.

When the modifier is a solid, the organic small molecular substance can be polymerized into an oligomer when the mass occupied in the first mixture is relatively small because the content of the active ingredient per unit mass of the solid modifier is high. Furthermore, under the condition of low thickening degree of the catalytic oil slurry, the viscosity of the modified oil slurry can be improved by adding the solid modifier, so that the viscosity of the modified asphalt is improved.

Secondly, when the modifier is a solution, the mass of the modifier accounts for 0.1 to 2 percent of that of the first mixture. As an example, it may be: 0.1%, 0.5%, 1%, 1.5%, 2%, etc.

Wherein, the concentration of the modifier solution is a fixed value, for example, the mass fraction of the modifier in the modifier solution may be: 5%, 10% or 15%, etc. During the actual dosing process, the mass of the desired modifier solution can be calculated based on the mass of the desired modifier and the mass fraction of modifier in the modifier solution.

For catalytic oil slurry with different thickening degrees, modifier solutions with different qualities are needed, so that the catalytic oil slurry can be effectively diluted, and the full reaction can be ensured. The modified oil slurry with proper thickening degree is obtained, has moderate viscosity and is beneficial to preparing the modified asphalt with higher adhesion property.

202. And stirring the first mixture to uniformly mix the catalytic slurry oil and the modifier.

The catalytic oil slurry is from the bottom of the catalytic cracking device and is generally thick, the feeding amount of the modifier is relatively small, the modifier cannot be spontaneously dissolved into the catalytic oil slurry after the modifier is added into the catalytic oil slurry, and the modifier can be uniformly dispersed in the catalytic oil slurry through stirring.

203. Heating the first mixture to a preset constant temperature, wherein the preset constant temperature is 50-450 ℃.

Wherein, when the modifier and the catalytic slurry oil are subjected to oxidation reaction, the reaction of polymerizing small molecules into oligomers is endothermic reaction, and the reaction can be accelerated by heating. Since the initial temperature of the first mixture is insufficient, it is necessary to raise its temperature by heating in order to reach the reaction temperature.

The higher the heating temperature, the faster the reaction proceeds, and the reaction speed can be controlled by adjusting a preset constant temperature. For example, the preset constant temperature may be: 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 150 ℃, 250 ℃, 350 ℃ or 450 ℃ and the like. In case of emergency, the reaction is stopped by lowering the temperature to 50 ℃ or lower, so that the reaction can be carried out under controlled conditions by adjusting the reaction temperature.

204. Maintaining the temperature of the first mixture at the predetermined constant temperature for a predetermined period of time.

The preset time duration is 0.1h to 240h, and for example, the preset time duration may be: 0.1h, 0.5h, 1.5h, 10h, 50h, 100h, 150h, 200h, 210h, 230h or 240h and the like.

Wherein, the reaction of the modifier and the catalytic slurry oil needs a certain time to enable the catalytic slurry oil to reach the required modification degree, and if the heat preservation time is too short, the reaction is possibly insufficient; if the incubation time is too long, the reaction may end early, resulting in waste of heat and time. Therefore, the heat preservation time is controlled within 0.1 h-240 h, so that the modifier and the catalytic slurry oil can fully react, and the low efficiency and the resource waste can be avoided.

205. And blending the modified oil slurry with the deoiled asphalt to obtain blended asphalt.

Wherein the mass ratio of the modified slurry oil to the deoiled asphalt is 1:9-9:1, the temperature of the blending process is 50-450 ℃, and the time duration of the blending process is 0.1-240 h.

Blending the modified slurry oil with the deoiled asphalt, for example, mixing the modified slurry oil with the deoiled asphalt, accelerating the flow between the modified slurry oil and the deoiled asphalt by heating and stirring, mixing and mutually permeating the modified slurry oil and the deoiled asphalt, and finally fusing the modified slurry oil and the deoiled asphalt into a stable colloid structure to obtain the blended asphalt. Because the blended asphalt is a stable colloid structure, the modified oil slurry is tightly adhered to the surface of the deoiled asphalt. The modified oil slurry plays a role in adhesion among the deoiled asphalt, and the adhesion performance of the blended asphalt is improved. According to the thickening degree of the modified slurry oil, the mass ratio of the modified slurry oil to the deoiled asphalt can be adjusted to be between 1:9 and 9:1. For example, when the modified slurry oil is thicker, the mass ratio of the modified slurry oil to the deoiled asphalt can be selected to be 1:9, 1:5 or 1:3; when the modified slurry oil is relatively diluted, the mass ratio of the modified slurry oil to the deoiled asphalt can be selected to be 1:1, 5:1 or 9:1 and the like.

Because the modified oil slurry is viscous, the deoiled asphalt is solid, and the flow between the modified oil slurry and the deoiled asphalt needs to be accelerated at the blending temperature, so that the blending speed of the modified oil slurry and the deoiled asphalt is accelerated.

The tempering temperature can be set according to production requirements, and can be, for example: 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 150 ℃, 250 ℃, 350 ℃ or 450 ℃ and the like.

When the blending temperature is the same as the preset constant temperature in the step 203, the heat preservation is continued without heating; and when the blending temperature is different from the preset constant temperature in the step 203, heating or cooling the mixture of the modified slurry oil and the deoiled asphalt according to the difference between the blending temperature and the preset constant temperature.

At the blending temperature, the mixture of the modified slurry oil and the deoiled asphalt can be fully mixed and mutually permeated after being stirred for sufficient time, so that the efficiency of the blending process is improved. Specifically, the time of the reconciliation process may be: 0.1h, 0.5h, 1h, 1.5h, 5h, 10h, 50h, 100h, 150h, 200h, 220h or 240h and the like.

Wherein, the deoiled asphalt can be obtained by the following steps: propane, butane, pentane and a mixed solvent are used as extracting agents and added into asphalt obtained from a catalytic cracking unit, and oil gas (such as diesel oil and gasoline) in the asphalt is extracted to obtain deoiled asphalt. The oil-gas content in the deoiled asphalt is low, so that the modification reaction is not influenced by oil gas when the deoiled asphalt is modified subsequently.

206. And mixing the styrene butadiene rubber and the blended asphalt to obtain a second mixture.

Wherein the mass of the styrene-butadiene rubber accounts for 0.1-20% of the mass of the second mixture, and the styrene-butadiene rubber is at least one of low-temperature emulsion polymerized styrene-butadiene rubber, low-temperature emulsion polymerized oil-extended styrene-butadiene rubber, low-temperature emulsion polymerized carbon black-extended styrene-butadiene rubber, high-temperature emulsion polymerized styrene-butadiene rubber and high-temperature emulsion polymerized carbon black-extended styrene-butadiene rubber.

Among the above chemicals, low temperature emulsion styrene butadiene rubber is generally prepared by emulsion polymerization of butadiene and styrene at 5 ℃; the low-temperature emulsion polymerization oil-extended styrene-butadiene rubber is formed by adding mineral oil (such as naphthenic oil and aromatic oil) into latex in the emulsion polymerization process of butadiene and styrene at 5 ℃, and absorbing a large amount of mineral oil after the latex is solidified; low-temperature emulsion polymerized carbon black-extended styrene-butadiene rubber: adding a certain amount of carbon black before emulsion polymerization of butadiene and styrene at 5 ℃ to uniformly disperse the carbon black in latex, and obtaining the carbon black after latex coagulation; high-temperature emulsion polymerized styrene-butadiene rubber: prepared by emulsion polymerization of butadiene and styrene at 50 ℃; high-temperature emulsion polymerization carbon black-extended styrene-butadiene rubber: the carbon black is uniformly dispersed in latex by adding a certain amount of carbon black before emulsion polymerization of butadiene and styrene at 50 ℃, and the carbon black is obtained after latex coagulation.

Styrene-butadiene rubber has thermoplasticity, high elasticity and weather resistance, wherein the weather resistance refers to the resistance of the material to different weather conditions (such as light, cold and hot, wind and rain, bacteria and the like). The thermoplasticity of the styrene-butadiene rubber can ensure that the styrene-butadiene rubber is uniformly distributed in the modified asphalt, the ductility of the modified asphalt can be improved due to high elasticity, and the weather resistance of the modified asphalt can be improved. The styrene butadiene rubber is added into the blended asphalt, so that the mixed modified asphalt has better weather resistance and ductility.

Optionally, the mass of the styrene-butadiene rubber accounts for 0.1% to 20% of the mass of the two mixtures, and may be, for example: 0.1%, 1%, 5%, 10%, 15%, 20%, etc. The mass of the catalytic slurry oil accounts for 80-99.9% of the mass of the first mixture, and can be exemplified by: 80%, 85%, 90%, 95%, 99.5%, etc.

207. And stirring the second mixture to obtain the modified asphalt.

The styrene butadiene rubber and the blend asphalt are in a viscous state, so that the second mixture is difficult to flow and can flow viscously under the action of external force, the styrene butadiene rubber and the blend asphalt can be fully mixed by stirring the second mixture, and the styrene butadiene rubber is uniformly distributed on the surface of the styrene butadiene rubber to obtain the modified asphalt.

The following may be further illustrated by the following examples in which the operations referred to are those without the indications of conditions, either according to conventional conditions or conditions suggested by the manufacturer. The raw materials are conventional products which can be obtained commercially by manufacturers and specifications.

In one possible implementation, which can be noted as example A, 900 parts of catalytic slurry oil, 180 parts of tert-butyl peroxypivalate modifier and 100 parts of deoiled asphalt are weighed by weight. Adding 180 parts of modifier into 900 parts of catalytic slurry oil, heating to 50 ℃ for modification, carrying out modification reaction for 240 hours, adding 100 parts of deoiled asphalt for blending, heating to 50 ℃ for blending, carrying out blending reaction for 0.1 hour, adding 10 parts of styrene butadiene rubber, and mixing to obtain the modified asphalt.

In one possible implementation, which can be noted as example B, 100 parts of catalytic slurry oil, 0.1 part of sulfur modifier and 900 parts of deoiled asphalt are weighed by weight. Adding 0.1 part of modifier into 100 parts of catalytic slurry oil, heating to 450 ℃ for modification, carrying out modification reaction for 0.1h, adding 900 parts of deoiled asphalt for blending, carrying out blending reaction for 240h at the blending temperature of 450 ℃, and adding 200 parts of butadiene styrene rubber for mixing to obtain the modified asphalt.

In one possible implementation, which can be noted as example C, 500 parts of catalytic slurry oil, 25 parts of zinc oxide modifier, and 500 parts of deoiled asphalt are weighed by weight. Adding 25 parts of modifier into 500 parts of catalytic slurry oil, heating to 200 ℃ for modification, carrying out modification reaction for 120h, adding 500 parts of deoiled asphalt for blending, carrying out blending reaction for 120h at the blending temperature of 200 ℃, adding 100 parts of styrene butadiene rubber for mixing, and obtaining the modified asphalt.

In one possible implementation, which can be noted as example D, 300 parts of catalytic slurry oil, 30 parts of magnesium oxide modifier, and 700 parts of deoiled asphalt are weighed by weight. Adding 30 parts of modifier into 300 parts of catalytic slurry oil, heating to 300 ℃ for modification, carrying out modification reaction for 20 hours, adding 700 parts of deoiled asphalt for blending, carrying out blending reaction for 80 hours at the blending temperature of 300 ℃, and adding 150 parts of butadiene styrene rubber for mixing.

The modified asphalt samples of examples A-D above were tested according to the experimental method for road asphalt performance in the road asphalt industry Standard JTG F40-2004 road asphalt pavement construction technical Specification. Where table 1 is the results of the ductility test of each example and table 2 is the results of the test of other properties of each example.

TABLE 1

TABLE 2

Examples of the invention	Penetration/10-1 mm	Softening point/. Degree.C	Kinematic viscosity at 60 ℃ Pa.S	PI index
					A	78.2	46.3	206.5	0.53
B	51.9	50.4	233.8	～0.03
					C	62.5	49.7	289.3	1.17
D	87.3	46.4	198.8	0.04

The test results show that the indexes of all the test results meet the road asphalt index requirements of JTG F40-2004 road asphalt pavement construction technical Specifications.

All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.

The modifier can polymerize organic micromolecular substances in the catalytic slurry oil into oligomers by mixing the modifier with oxidability with the catalytic slurry oil and carrying out constant-temperature heat treatment on the uniformly mixed modifier and the catalytic slurry oil, so that the modified slurry oil with higher oligomer content is obtained. Blending the modified oil slurry with deoiled asphalt, and blending the obtained blended asphalt with styrene butadiene rubber to obtain the modified asphalt. The modified asphalt has high oligomer content, so the modified asphalt has high softening point and ageing resistance, and the road paved by the modified asphalt is not easy to crack and has good weather resistance.

Further, the selected modifiers are as follows: at least one of peroxide modifier, sulfur and sulfide modifier and metal oxide, so that the oxidizing property of the modifier is moderate, and the moderate modification degree of the catalytic slurry oil is ensured. The modifier can polymerize organic small molecular substances in catalytic slurry oil into oligomers, so that the volatility of the modified slurry oil is improved. The modifier is divided into two feeding modes of solid and solution, so that the feeding mode of the modifier can adapt to catalytic oil slurry with various thickening degrees. The modified oil slurry and the deoiled asphalt are blended at a certain blending temperature and for a certain blending time, so that the blending efficiency can be improved.

Fig. 3 is a schematic structural diagram of an apparatus for preparing modified asphalt according to an embodiment of the present disclosure, please refer to fig. 3, the apparatus for preparing modified asphalt includes: a first mixing module 301, a first stirring module 302, a constant temperature heat treatment module 303, a tempering module 304, a second mixing module 305, and a second stirring module 306.

The first mixing module 301 is configured to mix catalytic slurry oil and a modifier to obtain a first mixture, where the catalytic slurry oil includes at least one of an out-swing slurry oil and a distillate oil generated in a catalytic cracking process, the modifier accounts for 0.1% -2% of the mass of the first mixture, both the out-swing slurry oil and the distillate oil include small organic molecular substances, and the modifier is configured to polymerize the small organic molecular substances in the catalytic slurry oil into oligomers;

a first stirring module 302, configured to stir the first mixture, so that the catalytic slurry oil and the modifier are uniformly mixed;

the constant-temperature heat treatment module 303 is configured to maintain the temperature of the first mixture at a preset constant temperature for a preset time period, where the preset time period is 0.1 hour to 240 hours, and the preset constant temperature is 50 ℃ to 450 ℃, so that the catalytic slurry oil reacts with the modifier to obtain a modified slurry oil;

the blending module 304 is used for blending the modified slurry oil and the deoiled asphalt to obtain blended asphalt, the mass ratio of the modified slurry oil to the deoiled asphalt is 1:9-9:1, the temperature in the blending process is 50-450 ℃, and the time length in the blending process is 0.1-240 h;

a second mixing module 305, configured to mix styrene-butadiene rubber and the blended asphalt to obtain a second mixture, where the mass of the styrene-butadiene rubber accounts for 0.1% to 20% of the mass of the second mixture;

and a second stirring module 306, configured to stir the second mixture to obtain modified asphalt.

It should be noted that: in the apparatus for preparing modified asphalt provided in the above embodiment, when the modified asphalt is prepared, only the division of the above functional modules is taken as an example, and in practical application, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the above described functions. In addition, the apparatus for preparing modified asphalt provided by the above embodiment and the method embodiment for preparing modified asphalt belong to the same concept, and the specific implementation process thereof is described in detail in the method embodiment and is not described herein again.

Fig. 4 is a schematic structural diagram of a computer device provided in an embodiment of the present disclosure. The computer device 400 may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 401 and one or more memories 402, where the memory 402 stores at least one instruction, and the at least one instruction is loaded and executed by the processor 401 to implement the method for preparing modified asphalt provided by the above method embodiments. Certainly, the computer device may further have components such as a wired or wireless network interface, a keyboard, and an input/output interface, so as to perform input and output, and the computer device may further include other components for implementing the functions of the device, which is not described herein again.

In exemplary embodiments, there is also provided a computer readable storage medium, such as a memory, comprising instructions executable by a processor in a computer device to perform the method of preparing modified asphalt of the above embodiments. For example, the computer readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk.

The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A method of preparing modified asphalt, comprising:

mixing catalytic slurry oil and a modifier to obtain a first mixture, wherein the catalytic slurry oil comprises at least one of external throwing slurry oil and distillate oil generated in a catalytic cracking process, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture, the external throwing slurry oil and the distillate oil both contain organic small molecular substances, and the modifier is used for polymerizing the organic small molecular substances in the catalytic slurry oil into oligomers;

maintaining the temperature of the first mixture at a preset constant temperature within a preset time period, wherein the preset time period is 0.1h to 240h, the preset constant temperature is 50-450 ℃, and reacting the catalytic slurry oil with the modifier to obtain modified slurry oil;

blending the modified oil slurry with deoiled asphalt to obtain blended asphalt, wherein the mass ratio of the modified oil slurry to the deoiled asphalt is 1 to 9, the temperature in the blending process is 50-450 ℃, and the time duration in the blending process is 0.1h to 240h;

mixing styrene butadiene rubber and the blended asphalt to obtain a second mixture, wherein the mass of the styrene butadiene rubber accounts for 0.1-20% of the mass of the second mixture;

stirring the second mixture to obtain modified asphalt;

the modifier comprises: at least one of a peroxide modifier, a sulfur and sulfide modifier, and a metal oxide;

the catalytic slurry oil further comprises a wax, and the modifier is also used for oxidizing the wax.

2. The method of claim 1, wherein the mass of the modifier is 0.1% to 0.5% of the mass of the first mixture when the modifier is a solid.

3. The method according to claim 1, wherein when the modifier is a solution, the mass of the modifier is 0.1-2% of the mass of the first mixture.

4. The method of claim 1, wherein the de-oiled asphalt comprises: at least one of deoiled asphalt obtained by propane deasphalting, deoiled asphalt obtained by butane deasphalting, deoiled asphalt obtained by pentane deasphalting and deoiled asphalt obtained by mixed solvent deasphalting.

5. An apparatus for producing modified asphalt according to claim 1, wherein the apparatus is applied to the method for producing modified asphalt, and the apparatus comprises:

the first mixing module is used for mixing catalytic slurry oil and a modifier to obtain a first mixture, wherein the catalytic slurry oil comprises at least one of external throwing slurry oil and distillate oil generated in a catalytic cracking process, the mass of the modifier accounts for 0.1-2% of the mass of the first mixture, the external throwing slurry oil and the distillate oil both contain organic small molecular substances, and the modifier is used for polymerizing the organic small molecular substances in the catalytic slurry oil into oligomers;

the constant-temperature heat treatment module is used for maintaining the temperature of the first mixture to be a preset constant temperature within a preset time, the preset time is 0.1h to 240h, the preset constant temperature is 50-450 ℃, and the catalytic slurry oil and the modifier are reacted to obtain modified slurry oil;

the blending module is used for blending the modified slurry oil and the deoiled asphalt to obtain blended asphalt, wherein the mass ratio of the modified slurry oil to the deoiled asphalt is 1;

the second mixing module is used for mixing styrene butadiene rubber and the blended asphalt to obtain a second mixture, wherein the mass of the styrene butadiene rubber accounts for 0.1-20% of that of the second mixture;

the second stirring module is used for stirring the second mixture to obtain modified asphalt;

the catalytic slurry oil also includes a wax, and the modifier also serves to oxidize the wax.

6. The apparatus for preparing modified asphalt according to claim 5, wherein when the modifier is solid, the mass of the modifier is 0.1-0.5% of the mass of the first mixture.

7. The apparatus for preparing modified asphalt according to claim 5, wherein when the modifier is a solution, the mass of the modifier is 0.1-2% of the mass of the first mixture.

8. The apparatus for preparing modified asphalt according to claim 5, wherein the deoiled asphalt comprises: at least one of deoiled asphalt obtained by propane deasphalting, deoiled asphalt obtained by butane deasphalting, deoiled asphalt obtained by pentane deasphalting and deoiled asphalt obtained by mixed solvent deasphalting.