Environment-friendly high-aromatic rubber plasticizer and preparation method thereof

Abstract

The invention provides an environment-friendly high-aromatic rubber plasticizer and a preparation method thereof, and relates to the technical field of petrochemical engineering, and the preparation method comprises the following steps: (a) carrying out solvent deasphalting on naphthenic base and / or intermediate base vacuum residue to obtain deasphalted oil as treatment oil A, and carrying out vacuum deep drawing on the treatment oil A to obtain a heavy component as treatment oil B; (b) hydrotreating the naphthenic base vacuum distillate oil to obtain hydrogenated oil, taking the hydrogenated oil, cutting off light fractions to obtain heavy fractions as treated oil C; and (c) blending the obtained treated oil B and treated oil C to obtain the environment-friendly high-aromatic-hydrocarbon rubber plasticizer. The method has the characteristics of short process flow, high product yield and high added value, and the obtained product is not only green and environment-friendly, but also relatively high in aromatic hydrocarbon content and relatively good in market competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical industry, and in particular to an environmentally friendly high-aromatic rubber plasticizer and a preparation method thereof. Background Art

[0002] At present, the production of environmentally friendly rubber plasticizers mainly has two processes of solvent refining and hydrorefining and their combined processes. The production of high-aromatic rubber plasticizers is mostly a solvent refining process, such as furfural refining, solvent deasphalting process and their combined processes; solvent refining is a physical extraction process, which has problems such as low yield of main products, large amounts of by-products with low added value, high processing costs, and environmental pollution risks during the processing, resulting in relatively low overall economic benefits. Therefore, developing a production process for environmentally friendly rubber plasticizers with high C A value and low cost has great practical significance.

[0003] For the production of high-aromatic rubber plasticizers, in the prior art, naphthenic cut 3 distillate oil is used as a raw material, and after two-stage furfural refining, an environmentally friendly rubber oil with a C A value of 10% - 18% is obtained, and at the same time, some low-value primary extraction oil or secondary extraction oil is produced, resulting in a low yield of the main product. A production method of a heavy environmentally friendly rubber oil disclosed in the prior art obtains an environmentally friendly rubber oil that meets the requirements of the EU REACH regulation through a two-stage propane solvent extraction process. The C A value of the environmentally friendly rubber oil obtained by this process is only 10% - 20%, and the product yield is low; a preparation method of an environmentally friendly rubber oil disclosed in the prior art performs primary propane deasphalting on naphthenic vacuum residue to obtain deasphalted oil, then performs secondary propane deasphalting on the deasphalted oil, and the obtained heavy deasphalted oil is mixed with naphthenic oil to obtain an environmentally friendly rubber oil (rubber plasticizer). The C A value of the obtained product is low. In the prior art, there is also a method using inferior naphthenic heavy wax oil as a raw material. First, a propane deasphalting process is used to obtain a tower top refined liquid, and then different combined processes (such as hydrorefining, single-stage furfural refining, and two-stage furfural refining) are used respectively to obtain an environmentally friendly rubber oil. The C A value of the rubber plasticizer samples obtained by the hydrorefining and single-stage furfural refining processes is low (only 12% - 18%), and the propane deasphalting and two-stage furfural refining processes have long flow paths and produce more by-products, resulting in a low yield of the main product. In the prior art, there is also a method using naphthenic distillate oil as a raw material, and producing a C AAn environmentally friendly rubber plasticizer with a value of 19% to 26% has good compatibility with rubber and excellent processing performance. However, the entire process flow is relatively long, and a low-value furfural extract oil is produced as a by-product. In the prior art, it is also disclosed that a vacuum distillate oil is used as a raw material, and a pretreated oil is obtained by hydrotreating, and then an extract oil is obtained through a furfural refining process. After hydrogenation, a high-aromatic environmentally friendly rubber oil is obtained. The rubber oil obtained by this process has a relatively high aromatic content, but the process flow is long, more by-products are generated, and the yield of the main product is low.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a preparation method of an environmentally friendly high-aromatic rubber plasticizer, which has the characteristics of a short process flow, a high product yield, and a high added value.

[0006] Another purpose of the present invention is to provide an environmentally friendly high-aromatic rubber plasticizer, which is green and environmentally friendly, and at the same time has a relatively high aromatic content and good market competitiveness.

[0007] In order to achieve the above purposes of the present invention, the following technical solutions are specifically adopted:

[0008] In the first aspect, a preparation method of an environmentally friendly high-aromatic rubber plasticizer includes the following steps:

[0009] (a) Solvent deasphalting of naphthenic and / or intermediate base vacuum residue to obtain deasphalted oil as treated oil A, and subjecting the treated oil A to vacuum deep distillation to obtain a heavy fraction as treated oil B;

[0010] (b) Hydrotreating naphthenic vacuum distillate oil to obtain a hydrogenated product oil, and removing the light fraction from the hydrogenated product oil to obtain a heavy fraction as treated oil C;

[0011] (c) Blending the treated oil B and the treated oil C to obtain an environmentally friendly high-aromatic rubber plasticizer.

[0012] Further, in step (a), the solvent used in the solvent deasphalting includes at least one of pentane, hexane, and heptane.

[0013] Further, the top temperature of the extraction column in the solvent deasphalting is 130°C to 170°C, and the bottom temperature is 120°C to 160°C;

[0014] Preferably, the internal pressure of the extraction column in the solvent deasphalting is 3.0 MPa to 4.5 MPa;

[0015] Preferably, the solvent-to-oil ratio used in the solvent deasphalting is 4:1 to 10:1.

[0016] Further, in step (a), the recombination is separated into fractions with a boiling point above 480 °C.

[0017] Further, the naphthenic vacuum distillate oil includes at least one of the second-line vacuum distillate oil, the third-line vacuum distillate oil, and the fourth-line vacuum distillate oil obtained by vacuum distillation of naphthenic crude oil;

[0018] Preferably, the kinematic viscosity of the naphthenic vacuum distillate oil at 100 °C is ≥6 mm 2 / s, and the C A ≥18%.

[0019] Further, the reaction temperature of the hydrotreating is 300 °C to 400 °C;

[0020] Preferably, the volume ratio of hydrogen to naphthenic vacuum distillate oil in the hydrotreating is (600 - 1200):1;

[0021] Preferably, the volume space velocity in the hydrotreating is 0.3 h -1 ~1.8 h -1 , and the hydrogen partial pressure is greater than 10 MPa.

[0022] Further, in step (b), the heavy fraction is a fraction with a boiling point above 360 °C;

[0023] Preferably, the open flash point of the heavy fraction is greater than 230 °C.

[0024] Further, in step (c), the mass ratio of the treated oil B and the treated oil C for blending is 1:9 to 5:5;

[0025] Preferably, the blending temperature is 60 °C to 180 °C, and the blending time is not less than 15 min.

[0026] Second aspect, an environmentally friendly high-aromatic rubber plasticizer prepared by the preparation method according to any one of the above.

[0027] Further, the C A value of the environmentally friendly high-aromatic rubber plasticizer is above 25%;

[0028] Preferably, the kinematic viscosity of the environmentally friendly high-aromatic rubber plasticizer at 100 °C is ≥20 mm 2 / s, the flash point is ≥240 °C, and the aniline point is ≤75 °C;

[0029] Preferably, the content of benzo[a]pyrene in the environmentally friendly high-aromatic rubber plasticizer is less than 1 mg / kg, the content of PAHs is less than 10 mg / kg, and the content of PCA is less than 3%.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] The preparation method of the environment-friendly high-aromatic rubber plasticizer provided by the present invention adopts a single-stage solvent (pentane) deasphalting process and a single-stage hydrotreating process for distillate oil. After blending, an environment-friendly rubber plasticizer product is obtained. The process flow of the present invention is short, and the product yield can reach more than 75%. The present invention converts low-value asphalt products into high-value rubber plasticizers. The obtained products meet the rubber plasticizer GB / T33322-2016 standard, belong to duty-free products, and have high market competitiveness.

[0032] The environment-friendly high-aromatic rubber plasticizer provided by the present invention is green and environmentally friendly, and at the same time has a high aromatic content, meeting the limited substance requirements for environmentally friendly processing oils in the "Technical Specification for Green Design Product Evaluation - Automotive Tires", that is, the BaP content ≤ 1 mg / kg and the PAHs content ≤ 10 mg / kg. The C A value of the environment-friendly high-aromatic rubber plasticizer product of the present invention is above 25%, and the PCA content is less than 3%. It has better compatibility with rubber compounds, carbon black, etc. during the tire preparation process, and can endow the tire with more excellent use performance. Specific embodiments

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] According to the first aspect of the present invention, a preparation method of an environment-friendly high-aromatic rubber plasticizer is provided, including the following steps:

[0035] (a) Solvent deasphalting of naphthenic and / or intermediate base vacuum residue to obtain deasphalted oil as treated oil A, and subjecting this treated oil A to vacuum deep distillation to obtain a heavy fraction as treated oil B;

[0036] (b) Hydrotreating naphthenic vacuum distillate oil to obtain a hydrotreated product oil, and removing the light fraction from this hydrotreated product oil to obtain a heavy fraction as treated oil C;

[0037] (c) Blending the obtained treated oil B and treated oil C to obtain an environment-friendly high-aromatic rubber plasticizer.

[0038] In the present invention, the processes adopted are a single-stage solvent deasphalting process and a single-stage hydrotreating process for distillate oil. After blending, an environment-friendly rubber plasticizer product is obtained. The process flow is short, and the product yield can reach over 75%. The low-value asphalt product is converted into a high-value rubber plasticizer. The obtained product meets the rubber plasticizer GB / T 33322-2016 standard and is a duty-free product, having high market competitiveness.

[0039] In the present invention, the naphthenic and / or intermediate-base vacuum residue refers to the vacuum residue obtained by vacuum distillation of naphthenic and / or intermediate-base crude oil, and the penetration of this vacuum residue is less than 200.

[0040] In a preferred embodiment, in step (a), the solvent used in the solvent deasphalting includes but is not limited to at least one or a mixture of pentane, hexane, and heptane, which is more conducive to further improving the effect of solvent deasphalting.

[0041] In a preferred embodiment, the top temperature of the extraction column in the solvent deasphalting can be 130°C to 170°C, and its typical but non-limiting temperatures are, for example, 130°C, 140°C, 150°C, 160°C, 170°C. The bottom temperature can be 120°C to 160°C, and its typical but non-limiting temperatures are, for example, 120°C, 130°C, 140°C, 150°C, 160°C.

[0042] In a preferred embodiment, the internal pressure of the extraction column in the solvent deasphalting can be 3.0 MPa to 4.5 MPa, and its typical but non-limiting internal pressures are, for example, 3.0 MPa, 3.5 MPa, 4.0 MPa, 4.5 MPa. At the same time, the solvent-to-oil ratio used can be 4:1 to 10:1.

[0043] It should be noted that in step (a), the deasphalted oil obtained from the solvent deasphalting reaction is subjected to vacuum deep distillation (removing light fractions), and the resulting heavy fraction is a fraction with a boiling point higher than 480°C.

[0044] In a preferred embodiment, the naphthenic vacuum distillate oil includes but is not limited to at least one of the second-stage vacuum distillate oil, the third-stage vacuum distillate oil, and the fourth-stage vacuum distillate oil obtained by vacuum distillation of naphthenic crude oil.

[0045] In the present invention, the kinematic viscosity of the naphthenic vacuum distillate oil at 100°C ≥ 6 mm 2 / s, C A ≥ 18%.

[0046] In a preferred embodiment, the reaction temperature of the hydrotreating can be 300°C to 400°C, and its typical but non-limiting reaction temperatures are, for example, 300°C, 320°C, 340°C, 360°C, 380°C, 400°C; the volume ratio of hydrogen to naphthenic vacuum gas oil in the hydrotreating can be (600 - 1200):1, and its typical but non-limiting volume ratios are, for example, 600:1, 700:1, 800:1, 900:1, 1000:1, 1100:1, 1200:1.

[0047] In the present invention, the catalyst used in the hydrotreating reaction can be at least one of a molybdenum-nickel type hydrotreating catalyst, a tungsten-nickel type hydrotreating catalyst, a molybdenum-cobalt type hydrotreating catalyst, and a molybdenum-tungsten-nickel type hydrotreating catalyst.

[0048] In the present invention, the volume hourly space velocity in the hydrotreating can be 0.3 h -1 -1.8 h -1 , and its typical but non-limiting volume hourly space velocities are, for example, 0.3 h -1 , 0.6 h -1 , 0.9 h -1 , 1.2 h -1 , 1.4 h -1 , 1.6 h -1 , 1.8 h -1 , and the hydrogen partial pressure can be greater than 10 MPa.

[0049] In a preferred embodiment, the heavy fraction of the hydrotreated hydrogenated product oil after removing the light fraction can be a fraction greater than 360°C, and its open flash point can be greater than 230°C.

[0050] In a preferred embodiment, the mass ratio of treating oil B to treating oil C for blending can be 1:9 to 5:5, and its typical but non-limiting mass ratios are, for example, 1:9, 2:8, 3:7, 4:6, 5:5; the blending temperature can be 60°C to 180°C, and its typical but non-limiting temperatures are, for example, 60°C, 70°C, 80°C, 90°C, 100°C, 120°C, 140°C, 160°C, 180°C, and the blending time is not less than 15 min.

[0051] A typical preparation method of an environmentally friendly high-aromatic rubber plasticizer includes the following steps:

[0052] (1) Performing a solvent deasphalting reaction on naphthenic and / or intermediate base vacuum residue to obtain deasphalted oil as treating oil A;

[0053] Among them, the solvent used in the solvent deasphalting is pentane, hexane, and / or heptane;

[0054] The top temperature of the extraction column in solvent deasphalting is 130°C to 170°C, the bottom temperature is 120°C to 160°C, the internal pressure of the extraction column is 3.0 MPa to 4.5 MPa, and the solvent-to-oil ratio used is 4:1 to 10:1;

[0055] (2) Using treated oil A as raw material, through vacuum deep distillation process, a heavy fraction (the heavy fraction is the fraction greater than 480°C) is obtained as treated oil B;

[0056] (3) Subjecting the naphthenic vacuum distillate oil to a hydrotreating reaction to obtain a hydrotreated product oil, and removing the light fraction from the obtained hydrotreated product oil to obtain a heavy fraction as treated oil C;

[0057] The naphthenic vacuum distillate oil is the second-line vacuum distillate oil, third-line vacuum distillate oil and / or fourth-line vacuum distillate oil obtained by vacuum distillation of naphthenic crude oil;

[0058] Among them, the reaction temperature of the hydrotreating is 300°C to 400°C, and the volume ratio of hydrogen to the naphthenic vacuum distillate oil is (600 - 1200):1;

[0059] The volume space velocity in the hydrotreating is 0.3 h -1 ~1.8 h -1 , and the hydrogen partial pressure is greater than 10 MPa;

[0060] The heavy fraction is the fraction greater than 360°C, and the open flash point of the heavy fraction is greater than 230°C;

[0061] (4) Blending treated oil B and treated oil C to obtain an environmentally friendly high-aromatic rubber plasticizer with a C A value greater than 25%;

[0062] Among them, the mass ratio of treated oil B and treated oil C for blending is 1:9 to 5:5, the blending temperature is 60°C to 180°C, and the blending time is not less than 15 min.

[0063] According to the second aspect of the present invention, there is provided an environmentally friendly high-aromatic rubber plasticizer prepared by the preparation method described in any one of the above.

[0064] In a preferred embodiment, the C A value of the environmentally friendly high-aromatic rubber plasticizer is above 25%, the kinematic viscosity at 100°C ≥ 20 mm 2 / s, the flash point ≥ 240°C, and the aniline point ≤ 75°C.

[0065] In the present invention, analyzed by the GC-MS method, the content of benzo[a]pyrene in the environment-friendly high-aromatic rubber plasticizer is less than 1 mg / kg, and the content of PAHs is less than 10 mg / kg (the content of PAHs is the content of 8 aromatic hydrocarbons including benzo[a]pyrene, benzo[e]pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, and dibenzo[a,h]anthracene), and the content of PCA is less than 3%.

[0066] In summary, the environment-friendly high-aromatic rubber plasticizer product of the present invention is green and environmentally friendly, and at the same time has a high aromatic hydrocarbon content, meeting the requirements of the limited substances for environmentally friendly processing oils in the "Technical Specification for the Evaluation of Green Design Products - Automotive Tires", that is, the BaP content ≤ 1 mg / kg and the PAHs content ≤ 10 mg / kg; the C A value of this environment-friendly high-aromatic rubber plasticizer product is above 25%, and the PCA content is less than 3%. It has better compatibility with rubber compounds, carbon black, etc. during the tire preparation process, and can endow the tire with more excellent use performance.

[0067] The present invention will be further described below through examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or directly purchased from the market.

[0068] Example 1

[0069] A preparation method of an environment-friendly high-aromatic rubber plasticizer, comprising the following steps:

[0070] (1) Perform a solvent deasphalting process on the Suizhong 36-1 vacuum residue (penetration 62 1 / 10 mm) produced by a refinery under the control of CNOOC to obtain deasphalted oil as treatment oil A1;

[0071] In the solvent deasphalting process, the solvent used is pentane, the volume ratio of the solvent to the oil is 8:1, the top temperature of the extraction column is 155 °C, the bottom temperature is 145 °C, and the operating pressure is 4.0 MPa;

[0072] (2) Using treatment oil A1 as the raw material, through a vacuum deep distillation process, obtain a fraction greater than 500 °C as treatment oil B1;

[0073] (3) Using the Suizhong 36-1 second reduced-line fraction oil (kinematic viscosity at 100 °C ≥ 6 mm 2 / s, C A ≥ 18%) as the raw material, perform high-pressure hydrogenation treatment, react under the conditions of a reaction pressure of 15 MPa, a reaction temperature of 340 °C, a volume space velocity of 0.35 h -1 , and a hydrogen-oil volume ratio of 1000:1 to obtain a hydrogenated product oil. Subject the obtained hydrogenated product oil to vacuum distillation (removing light fractions) to obtain a heavy fraction greater than 360 °C as treatment oil C1;

[0074] (4) After heating the treated oil B1 and the treated oil C1 to 80 °C, they are mixed at a mass ratio of 30:70 for blending, and stirred for 20 min to obtain an environmentally friendly high-aromatic rubber plasticizer, the properties of which are shown in Table 1.

[0075] Example 2

[0076] A preparation method of an environmentally friendly high-aromatic rubber plasticizer includes the following steps:

[0077] (1) The Sui-Zhong 36-1 vacuum residue (penetration 62 1 / 10 mm) produced by a refinery under CNOOC is subjected to a solvent deasphalting process to obtain deasphalted oil as the treated oil A2;

[0078] In the solvent deasphalting process, the solvent used is pentane, the volume ratio of the solvent to the oil is 8:1, the top temperature of the extraction column is 155 °C, the bottom temperature is 145 °C, and the operating pressure is 4.0 MPa;

[0079] (2) Using the treated oil A2 as the raw material, through a vacuum deep distillation process, a fraction greater than 500 °C is obtained as the treated oil B2;

[0080] (3) Using the Sui-Zhong 36-1 second reduced-line fraction oil (kinematic viscosity at 100 °C ≥ 6 mm 2 / s, C A ≥ 18%) as the raw material, it is subjected to high-pressure hydrogenation treatment, and the reaction is carried out under the conditions of a reaction pressure of 15 MPa, a reaction temperature of 340 °C, a volume space velocity of 0.35 h -1 and a hydrogen-oil volume ratio of 1000:1 to obtain a hydrogenated product oil. The obtained hydrogenated product oil is subjected to vacuum distillation (removing light fractions) to obtain a heavy fraction greater than 360 °C as the treated oil C2;

[0081] (4) After heating the treated oil B2 and the treated oil C2 to 80 °C, they are mixed at a mass ratio of 28:72 for blending, and stirred for 20 min to obtain an environmentally friendly high-aromatic rubber plasticizer, the properties of which are shown in Table 1.

[0082] Table 1 Environmentally friendly high-aromatic rubber plasticizer

[0083]

[0084] Comparative Example 1

[0085] The difference between this comparative example and Example 1 is that in step (1), the solvent deasphalting process is not carried out;

[0086] The remaining steps and their parameters are the same as those in Example 1;

[0087] Compared with Example 1, the defect of this comparative example is that without the solvent deasphalting process and directly carrying out blending, a large amount of resins and asphaltenes will be contained, resulting in the inability to measure the PCA content of the final product.

[0088] Comparative Example 2

[0089] The difference between this comparative example and Example 1 is that in step (2), the vacuum deep distillation process is not carried out;

[0090] The remaining steps and their parameters are the same as those in Example 1;

[0091] Compared with Example 1, the defect of this comparative example is that without the vacuum deep distillation process, there are more light components in the deasphalted oil and it contains more carcinogenic aromatic hydrocarbons, resulting in the failure of the environmental protection indicators of the final product to meet the requirements. Among them, the BaP content is 1.4 mg / kg, which is higher than the required index of not more than 1.0 mg / kg.

[0092] Comparative Example 3

[0093] The difference between this comparative example and Example 1 is that in step (3), the hydrogenation treatment is not carried out;

[0094] The remaining steps and their parameters are the same as those in Example 1;

[0095] Compared with Example 1, the defect of this comparative example is that without the hydrogenation treatment process, the second reduced crude fraction contains a large amount of eight carcinogenic aromatic hydrocarbons, and for the product obtained through the blending process, both the BaP content and the PAHs content do not meet the index requirements.

[0096] Comparative Example 4

[0097] The difference between this comparative example and Example 1 is that in step (3), the hydrogenated product oil is not subjected to vacuum distillation (removing light fractions);

[0098] The remaining steps and their parameters are the same as those in Example 1;

[0099] Compared with Example 1, the defect of this comparative example is that the hydrogenated product oil contains more light components, and for the product obtained through the blending process, its open flash point is relatively low, only 177 °C, which does not meet the index and user requirements.

[0100] In summary, it can be seen that for the preparation method of the environmentally friendly high-aromatic rubber plasticizer of the present invention, with the coordinated cooperation of each step, a high-C-value environmentally friendly high-aromatic rubber plasticizer with a high yield is obtained. It is a non-toxic green product, and has a relatively high aromatic hydrocarbon content. It has excellent processing performance during the tire processing process, which is beneficial to improving the overall economic efficiency. A value environmentally friendly high-aromatic rubber plasticizer, which is a non-toxic green product, and has a relatively high aromatic hydrocarbon content. It has excellent processing performance during the tire processing process, which is beneficial to improving the overall economic efficiency.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation method of an environment-friendly high-aromatic rubber plasticizer, characterized in that, It includes the following steps: (a) Solvent deasphalting is carried out on naphthenic and / or intermediate-base vacuum residue to obtain deasphalted oil as treating oil A, and the treating oil A is subjected to vacuum deep distillation to obtain heavy fraction as treating oil B; (b) The naphthenic vacuum distillate oil is hydrotreated to obtain a hydrotreated product oil, and the light fraction is cut off from the hydrotreated product oil to obtain a heavy fraction as treating oil C; (c) The treating oil B and treating oil C are blended to obtain an environmentally friendly high-aromatic rubber plasticizer.

2. The preparation method according to claim 1, wherein In step (a), the solvent used in the solvent deasphalting includes at least one of pentane, hexane and heptane.

3. The preparation method according to claim 2, characterized in that, In the solvent deasphalting, the top temperature of the extraction column is 130°C to 170°C, and the bottom temperature is 120°C to 160°C; Preferably, the internal pressure of the extraction column in the solvent deasphalting is 3.0 MPa to 4.5 MPa; Preferably, the solvent-to-oil ratio used in the solvent deasphalting is 4:1 to 10:

1.

4. The preparation method according to claim 1, characterized in that, In step (a), the heavy fraction is the fraction with a temperature higher than 480°C.

5. The preparation method according to any one of claims 1-4, characterized in that, In step (b), the naphthenic vacuum distillate oil includes at least one of the second-stage vacuum distillate oil, the third-stage vacuum distillate oil and the fourth-stage vacuum distillate oil obtained by vacuum distillation of naphthenic crude oil; Preferably, the kinematic viscosity of the naphthenic vacuum distillate at 100 °C ≥ 6 mm 2 / s, and C A ≥ 18%.

6. The preparation method according to claim 5, characterized in that, The reaction temperature of the hydrotreating is 300°C to 400°C; Preferably, the volume ratio of hydrogen to naphthenic vacuum distillate oil in the hydrotreating is (600 - 1200):1; Preferably, the hourly space velocity in the hydrotreating is 0.3 h -1 ~1.8 h -1 , and the hydrogen partial pressure is greater than 10 MPa.

7. The preparation method according to claim 1, wherein In step (b), the heavy fraction is the fraction with a temperature higher than 360°C; Preferably, the open flash point of the heavy fraction is higher than 230°C.

8. The preparation method according to claim 1, characterized in that, In step (c), the mass ratio of the treating oil B and treating oil C for blending is 1:9 to 5:5; Preferably, the blending temperature is 60°C to 180°C, and the blending time is not less than 15 min.

9. An environmentally friendly high-aromatic rubber plasticizer prepared by the preparation method according to any one of claims 1 - 8.

10. The environmentally friendly high-aromatic rubber plasticizer according to claim 9, wherein, The C of the environmentally friendly high-aromatic rubber plasticizer A value is above 25%; Preferably, the kinematic viscosity of the environmentally friendly high-aromatic rubber plasticizer at 100 °C ≥ 20 mm 2 / s, flash point ≥ 240 °C, aniline point ≤ 75 °C; Preferably, the content of benzo[a]pyrene in the environmentally friendly high-aromatic rubber plasticizer is less than 1 mg / kg, the content of PAHs is less than 10 mg / kg, and the content of PCA is less than 3%.

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