CN113817499B

CN113817499B - Rust-preventive base oil and metal rust-preventive oil

Info

Publication number: CN113817499B
Application number: CN202111050374.0A
Authority: CN
Inventors: 曹雪萍; 单贤根; 王洪学; 杨葛灵; 陈茂山; 韩来喜
Original assignee: China Shenhua Coal to Liquid Chemical Co Ltd; Shanghai Research Institute of China Shenhua Coal to Liquid Chemical Co Ltd; Ordos Coal to Liquid Branch of China Shenhua Coal to Liquid Chemical Co Ltd
Current assignee: China Shenhua Coal to Liquid Chemical Co Ltd; Shanghai Research Institute of China Shenhua Coal to Liquid Chemical Co Ltd; Ordos Coal to Liquid Branch of China Shenhua Coal to Liquid Chemical Co Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2023-04-28
Anticipated expiration: 2041-09-08
Also published as: CN113817499A

Abstract

The invention relates to the technical field of direct coal liquefaction oil, in particular to rust-proof base oil and metal rust-proof oil, wherein the rust-proof base oil comprises at least one narrow-boiling-range distillate oil; the preparation method of the narrow-range distillate comprises the following steps: (1) In the presence of a first hydrogenation catalyst, directly liquefying coal into intermediate oil to perform a first hydrogenation reaction to obtain a first hydrogenation product; then, under the action of a second hydrogenation catalyst, carrying out a second hydrogenation reaction on the first hydrogenation product to obtain a second hydrogenation product; (2) Cutting the second hydrogenation product to obtain a plurality of distillate oil with narrow distillation range; the invention takes medium-temperature solvent oil and high-temperature solvent oil in the intermediate oil of direct coal liquefaction as raw materials to carry out hydrogenation reaction to obtain hydrogenation products, and the hydrogenation products are cut to obtain a plurality of narrow-range distillate oil which are blended to obtain the antirust base oil with good low-temperature fluidity and solubility, low viscosity and low surface tension.

Description

Rust-preventive base oil and metal rust-preventive oil

Technical Field

The invention relates to the technical field of direct coal liquefaction oil, in particular to rust-proof base oil and metal rust-proof oil.

Background

In the process of processing and preserving metal products, rust protection is generally required by using rust-proof grease. The rust preventive oil is prepared by adding auxiliary additives such as an oil-soluble corrosion inhibitor, a cleaning dispersant, an antioxidant and a corrosion inhibitor into petroleum base oil, and is widely applied to metal processing production as a temporary protective product. The rust-preventive oil mainly comprises base oil, a rust inhibitor and other auxiliary additives, wherein the base oil is a main component and accounts for about 75% -95% of the rust-preventive oil, and mainly plays two roles of a carrier and an oil effect. At present, more mineral base oils are mainly hydrogenated base oils, namely synthetic oils and mineral oils, and the base oils are poor in rust resistance and require corresponding rust inhibitors to be added according to the rust resistance requirements of the oil products, so that the base oils have different rust resistance and solvent resistance and sensibility and influence the rust resistance of the rust inhibitors in the oil products.

Taking dehydrated rust preventive oil as an example, acceptable metal rust preventive base oil is required to have good solubility and low-temperature fluidity, low aromatic hydrocarbon, low viscosity and other properties. The conventional rust-preventive oil base oil mainly comprises synthetic oil and mineral oil, and medium-temperature solvent oil and high-temperature solvent oil in the direct coal liquefaction oil are combined with the properties of inferior distillate oil and heavy aromatic hydrocarbon, so that the base oil cannot be directly used, and the properties provide challenges for the processing and recycling of the direct coal liquefaction heavy oil along with the gradual improvement of environmental protection requirements.

At present, no technological method for preparing metal rust-proof base oil by using coal direct liquefied oil as a raw material exists.

Disclosure of Invention

The invention aims to solve the problem that heavy oil directly liquefied by coal cannot be directly used in the prior art, and provides rust-preventive base oil and metal rust-preventive oil.

Compared with petroleum-based low-aromatic solvent oil, the inventor of the invention finds that the content of sulfur, nitrogen and other heteroatoms in the intermediate product of direct coal liquefaction and the high-temperature solvent oil is high, the content of alkane is low, the contents of polycyclic aromatic hydrocarbon and polycyclic naphthene are higher, the property of poor-quality distillate oil and heavy aromatic hydrocarbon are combined, the aromatic hydrocarbon content is low after two-stage hydrogenation, and the naphthene component content can reach more than 80wt%; after the medium-temperature solvent oil and the high-temperature solvent oil in the intermediate oil which is directly liquefied by coal are mixed according to a specific proportion, hydrogenation products with good low-temperature fluidity and solubility, low viscosity and low surface tension can be obtained after two-stage catalytic hydrogenation under the action of a specific catalyst, and the hydrogenation products have good antirust effect and can be used as environment-friendly antirust oil base oil.

In order to achieve the above object, the first aspect of the present invention provides a method for producing a rust inhibitive base oil, comprising at least one narrow boiling range distillate; the preparation method of the narrow-range distillate comprises the following steps:

(1) In the presence of a first hydrogenation catalyst, directly liquefying coal into intermediate oil to perform a first hydrogenation reaction to obtain a first hydrogenation product; then, under the action of a second hydrogenation catalyst, carrying out a second hydrogenation reaction on the first hydrogenation product to obtain a second hydrogenation product;

(2) Cutting the second hydrogenation product to obtain a plurality of distillate oil with narrow distillation range;

wherein the first hydrogenation catalyst comprises a first carrier and an active metal component supported on the first carrier; the active metal component is at least one of molybdenum, tungsten, nickel and cobalt;

the second hydrogenation catalyst is a noble metal catalyst;

the intermediate oil for direct coal liquefaction comprises medium-temperature solvent oil and/or high-temperature solvent oil;

the distillation range of the medium-temperature solvent oil is 220-330 ℃, and the distillation range of the high-temperature solvent oil is 331-480 ℃.

A second aspect of the present invention provides a metal rust preventive oil comprising the rust preventive base oil of the foregoing first aspect.

According to the technical scheme, after the medium-temperature solvent oil and the high-temperature solvent oil in the intermediate oil are directly liquefied by coal are blended, hydrogenation reaction is carried out twice under the action of a specific catalyst, so that a hydrogenation product with high naphthene content and low aromatic hydrocarbon content is obtained, and then a plurality of narrow-range distillate oils obtained by cutting the hydrogenation product are blended, so that the antirust base oil with good low-temperature fluidity and solubility, low viscosity and low surface tension is obtained; the invention takes the intermediate product of direct coal liquefaction as the processing raw material, which is not only beneficial to developing and expanding the market application of direct coal liquefaction oil, but also overcomes the basic national condition of lack of petroleum-based raw oil, thereby better meeting the increasing market demand.

Detailed Description

The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.

As previously described, a first aspect of the present invention provides a process for preparing a rust inhibitive base oil comprising at least one narrow boiling range distillate; the preparation method of the narrow-range distillate comprises the following steps:

the second hydrogenation catalyst is a noble metal catalyst;

The inventor of the invention discovers that according to the characteristics of medium-temperature solvent oil and high-temperature solvent oil, specific types of medium-temperature solvent oil and high-temperature solvent oil are mixed according to a specific proportion, then hydrogenation reaction is carried out under specific conditions by adopting a specific first hydrogenation catalyst and a specific second hydrogenation catalyst respectively, and the hydrogenation product with a specific distillation range obtained by segmentation has the advantages of naphthenic oil, and also has the advantages of coal-based solvent oil such as high density, low viscosity, low surface tension, excellent solubility, low-temperature fluidity and the like, so that the oil can be used as an environment-friendly rust-preventive oil base oil.

In the invention, the first hydrogenation is adopted to remove part of nitrogen elements in the intermediate oil of direct coal liquefaction, and then the second hydrogenation reaction is carried out; in some preferred embodiments of the present invention, the medium temperature solvent oil and the high temperature solvent oil can be simultaneously hydrofined and hydroupgraded through a first hydrogenation reaction, so as to realize partial aromatic saturation in the intermediate oil in direct coal liquefaction; preferably, the active metal component is contained in the first hydrogenation catalyst in an amount of 25 to 35wt% in terms of oxide based on the total amount of the first hydrogenation catalyst, and preferably the specific surface area of the first hydrogenation catalyst is 50 to 1000cm ² Per g, the pore volume is 0.1-1.5mL/g, and the average pore diameter is 10-15nm; the first hydrogenation catalyst may be commercially available.

According to the present invention, preferably, the conditions of the first hydrogenation reaction at least satisfy: the temperature is 360-385 ℃, the pressure is 15-20MPa, and the volume airspeed is 0.8-1.2h ^-1 Hydrogen-to-oil ratio 800-1000:1.

in some preferred embodiments of the invention, the second hydrogenation reaction can be used for carrying out deep hydrofining reaction, so that aromatic hydrocarbon is deeply saturated and polycyclic aromatic hydrocarbon is better removed; the second hydrogenation catalyst comprises a second carrier and noble metals supported on the second carrier; preferably, the noble metal is selected from platinum and/or palladium; further preferably, the content of the noble metal in the second hydrogenation catalyst is from 0.1 to 0.6wt%, preferably from 0.2 to 0.5wt%, based on the total amount of the second hydrogenation catalyst, preferablyThe specific surface area of the second hydrogenation catalyst is 80-250cm ² Per gram, the pore volume is 0.4-0.6mL/g, and the average pore diameter is 5-9nm; the first hydrogenation catalyst may be commercially available.

In the invention, the main purpose of the first hydrogenation reaction is to carry out hydrofining and partial modification reaction, and the second hydrogenation reaction can make the hydrofining reaction deeper, so the condition of the second hydrogenation reaction is gentler than that of the first hydrogenation reaction.

According to the present invention, preferably, the conditions of the second hydrogenation reaction at least satisfy: the temperature is 180-220 ℃, the pressure is 15-20MPa, and the volume airspeed is 0.6-1.2h ^-1 Hydrogen-to-oil ratio 500-1000:1.

preferably, the kinds of the first and second carriers may be known to those skilled in the art, and exemplary, the first and second carriers are each independently selected from at least one of amorphous silicon, amorphous aluminum, and amorphous silicon aluminum.

According to the invention, at least one of a diluent, a protective agent and a propping agent can be selected to be additionally used in the catalyst bed layer according to the type of the catalyst and the condition of hydrogenation reaction, wherein the diluent can be an inert porcelain ball, and the diameter of the inert porcelain ball is preferably 1-6mm; the kind of the protective agent can be known to those skilled in the art, and can be, for example, a commercial product of China institute of Petroleum model RNC-1; the proppants may be inert porcelain spheres, preferably 1-6mm in diameter. In the present invention, the diluent, the protecting agent and the propping agent are not limited to the above preferred types, and those skilled in the art can appropriately select according to the types of catalysts and the conditions of hydrogenation reaction.

In some preferred embodiments of the present invention, in order to further reduce the content of heteroatoms such as sulfur and nitrogen in the hydrogenation product and increase the content of naphthenes, the preparation method preferably further comprises: and (2) returning the second hydrogenation product to the step (1) to circularly carry out the first hydrogenation reaction and the second hydrogenation reaction for 1 to 5 times, preferably 2 to 3 times.

According to the invention, the paraffin content in the high-temperature solvent oil is less than or equal to 5wt%, the naphthene content is less than or equal to 7wt% and the arene content is more than or equal to 75wt% based on the total amount of the high-temperature solvent oil under a preferable condition; more preferably, the paraffin content is less than or equal to 4.5 weight percent, the naphthene content is less than or equal to 6 weight percent, and the arene content is more than or equal to 80 weight percent; further preferably, the content of monocyclic aromatic hydrocarbon in the high-temperature solvent oil is more than or equal to 40wt%, the content of bicyclic aromatic hydrocarbon is more than or equal to 23wt%, and the content of polycyclic aromatic hydrocarbon is more than or equal to 12wt%, based on the total amount of the high-temperature solvent oil.

Under the preferential condition, the paraffin content in the medium-temperature solvent oil is less than or equal to 6wt percent, the naphthene content is less than or equal to 30wt percent and the arene content is more than or equal to 60wt percent based on the total amount of the medium-temperature solvent oil; further preferably, the content of monocyclic aromatic hydrocarbon in the medium temperature solvent oil is more than or equal to 50wt%, the content of bicyclic aromatic hydrocarbon is more than or equal to 10wt%, and the content of polycyclic aromatic hydrocarbon is more than or equal to 0.3wt%, based on the total amount of the medium temperature solvent oil.

In some preferred embodiments of the present invention, the coal direct liquefaction intermediate oil comprises 1 to 99wt% medium temperature solvent oil and 1 to 99wt% high temperature solvent oil, based on the total amount of the coal direct liquefaction intermediate oil; preferably, the intermediate oil for direct coal liquefaction comprises 30 to 70wt% of medium temperature solvent oil and 30 to 70wt% of high temperature solvent oil, more preferably, the intermediate oil for direct coal liquefaction comprises 40 to 60wt% of medium temperature solvent oil and 40 to 60wt% of high temperature solvent oil.

According to the present invention, the narrow boiling range distillate preferably has a boiling range width of 5 to 120 ℃, for example, 5 ℃,10 ℃,20 ℃,40 ℃, 60 ℃, 80 ℃,100 ℃, 120 ℃ or any value in the range of any two of the above values, preferably 60 to 80 ℃; further preferably, the initial boiling point of the narrow-range distillate is 220 to 300 ℃, for example, 220 ℃, 240 ℃, 260 ℃, 265 ℃, 280 ℃, 300 ℃ or any value in the range of any two of the above values; the final distillation point of the narrow-range distillate is 270-400 ℃, and can be 270 ℃, 280 ℃, 300 ℃, 320 ℃, 360 ℃, 400 ℃ or any value in the range formed by any two of the above values; and the final distillation point value is greater than the initial distillation point value, and the plurality of the narrow-range distillate may be, for example, a plurality of distillate having a distillation range of 220-280 ℃, 240-320 ℃, 260-320 ℃, 265-320 ℃, 280-360 ℃ or 280-400 ℃.

The inventor of the present invention found that, although the processing difficulty of high temperature solvent oil in intermediate products of direct coal liquefaction is high, aromatic hydrocarbon can be saturated, desulfurized and denitrified by a hydrofining method, and the intermediate products are processed into environment-friendly naphthenic solvent oil with low aromatic hydrocarbon and high naphthenic content, and under the preferable condition, the hydrogenation reaction conditions lead the obtained hydrogenation product to meet the following conditions: based on the total amount of the hydrogenation products, the aromatic hydrocarbon content in the hydrogenation products is less than or equal to 5 weight percent, the naphthene content is more than or equal to 70 weight percent, and the aniline point of the hydrogenation products is less than or equal to 70 ℃.

In the present invention, the method for cutting the hydrogenation product may be known to those skilled in the art, and may be, for example, at least one of reduced pressure distillation, atmospheric distillation, and true boiling point distillation.

The second aspect of the invention provides a metal rust preventive oil comprising the rust preventive base oil.

Preferably, the metal rust preventive oil further comprises an auxiliary agent, wherein the auxiliary agent is at least one selected from a rust preventive agent, a stabilizing agent, a film forming agent, a diluting agent and a corrosion inhibitor;

preferably, the total content of the auxiliary agent is 0.1-50wt% based on the total amount of the metal rust preventive oil.

In the invention, the types and the amounts of the auxiliary agents can be reasonably selected according to actual needs, and can be known by those skilled in the art, and the invention is not repeated here.

According to a particularly preferred embodiment of the present invention, the rust inhibitive base oil includes at least one narrow boiling range distillate, and the method for preparing the narrow boiling range distillate includes:

(1a) In the presence of a first hydrogenation catalyst, directly liquefying the intermediate oil by the coal to perform a first hydrogenation reaction to obtain a first hydrogenation product, wherein the first hydrogenation reaction conditions are as follows: 360-385 deg.C, 15-20MPa and 0.8-1.2h of volume airspeed ^-1 Hydrogen-to-oil ratio 800-1000:1, a step of;

the first hydrogenation catalyst comprises a first carrier and an active metal component loaded on the first carrier, wherein the active metal component is at least two of molybdenum, tungsten, nickel and cobalt, and the content of the active metal component in the first hydrogenation catalyst is 25-35wt% in terms of oxide based on the total amount of the first hydrogenation catalyst;

(1b) In the presence of a second hydrogenation catalyst, directly liquefying intermediate oil by coal to perform a second hydrogenation reaction to obtain a second hydrogenation product, wherein the second hydrogenation reaction conditions are as follows: 180-220 ℃, 15-20MPa of pressure and 0.6-1h of volume airspeed ^-1 Hydrogen-to-oil ratio 500-1000:1, a step of;

the second hydrogenation catalyst comprises a second carrier and noble metals supported on the second carrier, wherein the content of the noble metals in the second hydrogenation catalyst is 0.1-0.6wt% based on the total amount of the second hydrogenation catalyst;

(2) Cutting the second hydrogenation product to obtain a plurality of narrow-range distillate, wherein the range width of the narrow-range distillate is 60-80 ℃; the initial distillation point of the narrow-range distillate is 220-300 ℃, and the final distillation point of the narrow-range distillate is 270-400 ℃; and the initial distillation point of the narrow-range distillate is smaller than the final distillation point;

wherein the intermediate oil for direct coal liquefaction comprises 40-60wt% of medium temperature solvent oil and 40-60wt% of high temperature solvent oil;

the distillation range of the medium-temperature solvent oil is 220-330 ℃, and the paraffin content in the medium-temperature solvent oil is less than or equal to 6wt percent, the naphthene content is less than or equal to 30wt percent and the aromatic hydrocarbon content is more than or equal to 60wt percent based on the total amount of the medium-temperature solvent oil;

the distillation range of the high-temperature solvent oil is 330-480 ℃, and the paraffin content is less than or equal to 5wt%, the naphthene content is less than or equal to 7wt% and the arene content is more than or equal to 75wt% in the high-temperature solvent oil based on the total amount of the high-temperature solvent oil;

based on the total amount of the second hydrogenation product, the aromatic hydrocarbon content in the hydrogenation product is less than or equal to 5wt percent, the naphthene content is more than or equal to 70wt percent, and the aniline point of the hydrogenation product is less than or equal to 70 ℃.

The present invention will be described in detail by examples. In the following examples, physical properties of the intermediate oil obtained by directly liquefying coal are shown in table 1.

TABLE 1

	High temperature solvent oil	Medium temperature solvent oil
			Density, 20 ℃/(g/cm) ³ )	1.00	0.9446
Distillation range/(DEGC)	331-480	220-330
			Kinematic viscosity, 40 ℃/(mm) ² /s)	9.79	2.54
Kinematic viscosity, 100 ℃/(mm) ² /s)	3.53	1.11
			Open flash point/(. Degree.C)	131	91
Pour point/(. Degree.C)	-7	-47
			Paraffin content/(wt%)	4.4	5.8
Total naphthene content/(wt%)	6.0	28.9
			Total monocyclic aromatic hydrocarbon content/(wt%)	42.9	52.1
Total bicyclic aromatic content/(wt%)	24.2	12.6
			Total polycyclic aromatic hydrocarbon content/(wt%)	13.9	0.6
Carbon content/(wt%)	89.69	88.46
			Hydrogen content/(wt%)	9.64	10.99
Nitrogen content/(mg/L)	797.39	275.36
			Sulfur content/(mg/L)	37.28	16.88

In the following examples, the types of the medium active components of the catalyst and the physical properties of the catalyst are shown in Table 2, the propping agent in the catalyst bed layer is inert porcelain balls with the diameter of 3mm, and the diluting agent is inert porcelain balls with the diameter of 1 mm.

TABLE 2

Example 1

The intermediate oil (raw oil) for direct coal liquefaction contains 50wt% of medium temperature solvent oil and 50wt% of high temperature solvent oil;

the method for preparing the narrow-range distillate comprises the following steps:

(1a) In the presence of a catalyst Cat2, directly liquefying the intermediate oil by the coal to perform a first hydrogenation reaction to obtain a first hydrogenation product;

(1b) In the presence of a catalyst Cat4, directly liquefying intermediate oil by coal to perform a second hydrogenation reaction to obtain a second hydrogenation product;

(2) Cutting the second hydrogenation product to obtain narrow-range distillate with a distillation range of 265-320 ℃;

the above-mentioned narrow-boiling range distillate was directly used as the rust preventive base oil 1.

In this example, the operating conditions and experimental results of each step are shown in Table 3.

Example 2

The procedure of example 1 was followed except that the conditions for hydrogenation and the conditions for cleavage were different, and that a narrow-boiling-range distillate having a boiling range of 280 to 400℃obtained by cleavage was used as rust preventive base oil 2, and the operating conditions and experimental results of the respective steps are shown in Table 3.

TABLE 3 Table 3

Example 3

The procedure of example 1 was followed except that the intermediate oil (raw oil) for direct coal liquefaction contained 30wt% of medium temperature solvent oil and 70wt% of high temperature solvent oil, and the operating conditions and experimental results of the respective steps are shown in Table 4.

Example 4

The procedure of example 1 was followed except that the intermediate oil (raw oil) for direct coal liquefaction contained 80wt% of medium temperature solvent oil and 20wt% of high temperature solvent oil, and the operating conditions and experimental results of the respective steps are shown in Table 4.

TABLE 4 Table 4

Comparative example 1

The procedure of example 1 was followed except that the first hydrogenation catalyst was Cat2 and the second hydrogenation catalyst was Cat1, and the operating conditions and experimental results of the respective steps are shown in Table 5.

Comparative example 2

The procedure of example 1 was followed except that the first hydrogenation catalyst was Cat3 and the second hydrogenation catalyst was Cat4, and the operating conditions and experimental results of the respective steps are shown in Table 5.

TABLE 5

Comparative examples 3 to 4

The procedure of example 1 was followed except that the hydrogenation conditions and experimental results were as shown in Table 6.

TABLE 6

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Examples 5 to 6

The procedure of example 1 was followed except that the intermediate oil (raw oil) obtained by direct coal liquefaction was a high-temperature solvent oil, and the operating conditions and experimental results of the respective steps in this example are shown in Table 7.

TABLE 7

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Examples 7 to 8

The procedure of example 1 was followed except that the intermediate oil (raw oil) obtained by direct coal liquefaction was a medium-temperature solvent oil, and the operating conditions and experimental results of the respective steps in this example are shown in Table 8.

TABLE 8

As can be seen from tables 3 to 8, the rust inhibitive base oils obtained in examples 1 to 8 all have an aromatic hydrocarbon content of < 5%, a naphthene content of > 70%, an aniline point of < 80, a pour point of < -10 ℃, and have the advantages of low aromatic, low naphthene, low pour point and good solubility.

Comparative example 5

The method adopts domestic low aromatic solvent oil 1# as rust-proof base oil, wherein the domestic low aromatic solvent oil 1# is rust-proof base oil of model D80 of Shanxi Ankan chemical industry Co., ltd, and the distillation range is 202-214 ℃.

Comparative example 6

The method adopts domestic low aromatic solvent oil 2# as rust-proof base oil, wherein the domestic low aromatic solvent oil 2# is rust-proof base oil of model D90 of Shanxi Ankan chemical industry Co., ltd, and the distillation range is 210-225 ℃.

Comparative example 7

The foreign low aromatic solvent oil 1# is used as rust-proof base oil, the foreign low aromatic solvent oil 1# is rust-proof base oil with the model D120 of Exxon Mobil company of Exxon, and the distillation range is 263-297 ℃.

Comparative example 8

The foreign low aromatic solvent oil 2# is adopted as the rust-proof base oil, the foreign low aromatic solvent oil 2# is the rust-proof base oil of Korean S-K company model YK-D130, and the distillation range is 279-297 ℃.

Experimental example

Rust inhibitors (zinc naphthenate and TW742, shanghai microphone biochemistry limited company) were added to the rust inhibitive base oils in examples 1 to 8 and comparative examples 1 to 4, to obtain corresponding metal rust inhibitive oils.

According to the salt spray test method of SH/T0081-1991, 5% sodium chloride saline solution with pH value of 6-7 is adopted as spray liquid, the test temperature is 35 ℃, and the sedimentation rate of salt spray is 1-2ml/80cm ² Between h. The steel sheet for rust-proof salt spray test is No. 10 steel sheet conforming to GB/T711, and after the sample steel sheet coated with metal rust-proof oil is placed in a salt spray box for 72 hours, the rust degree of the test piece is judged according to SH/T0217, and the result is obtained according to the rust grade. In the experiment, A level indicates that the steel sheet is rust-free, B level indicates that rust points occur in 1-10% of the area of the surface of the steel sheet, C level indicates that rust points occur in 11-25% of the area of the surface of the steel sheet, D level indicates that rust points occur in 26-50% of the area of the surface of the steel sheet, and experimental results are shown in tables 9 and 10.

TABLE 9

Table 10

As can be seen from tables 9 and 10, the rust preventive base oil prepared in the examples of the present invention has better rust preventive performance after being compounded with the rust preventive.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.

Claims

1. A rust inhibitive base oil characterized by comprising at least one narrow boiling range distillate; the preparation method of the narrow-range distillate comprises the following steps:

the first hydrogenation reaction conditions at least satisfy: the temperature is 360-385 ℃, the pressure is 15-20MPa, and the volume airspeed is 0.8-1.2h ^-1 Hydrogen-to-oil ratio 800-1000:1, a step of;

the conditions of the second hydrogenation reaction at least satisfy: the temperature is 180-220 ℃, the pressure is 15-20MPa, and the volume airspeed is 0.6-1.2h ^-1 Hydrogen-to-oil ratio 500-1000:1, a step of;

based on the total amount of the second hydrogenation product, the content of aromatic hydrocarbon in the second hydrogenation product is less than or equal to 5wt%, the content of naphthene is more than or equal to 70wt%, and the aniline point is less than or equal to 70 ℃;

the second hydrogenation catalyst is a noble metal catalyst;

the direct coal liquefaction intermediate oil comprises 30-70wt% of medium-temperature solvent oil and 30-70wt% of high-temperature solvent oil based on the total amount of the direct coal liquefaction intermediate oil;

the distillation range of the medium-temperature solvent oil is 220-330 ℃, and the distillation range of the high-temperature solvent oil is 331-480 ℃;

the distillation range width of the narrow distillation range distillate oil is 5-120 ℃;

the initial distillation point of the narrow-range distillate oil is 220-300 ℃, the final distillation point of the narrow-range distillate oil is 270-400 ℃, and the final distillation point value is larger than the initial distillation point value.

2. The rust inhibitive base oil according to claim 1, wherein the active metal component is contained in the first hydrogenation catalyst in an amount of 25 to 35wt% in terms of oxide based on the total amount of the first hydrogenation catalyst.

3. The rust inhibitive base oil according to claim 1 or 2, wherein the second hydrogenation catalyst comprises a second support and a noble metal supported on the second support.

4. A rust inhibitive base oil according to claim 3, wherein the noble metal is selected from platinum and/or palladium.

5. The rust inhibitive base oil according to claim 3, wherein the content of the noble metal in the second hydrogenation catalyst is 0.1 to 0.6wt% based on the total amount of the second hydrogenation catalyst.

6. The rust inhibitive base oil according to any one of claims 1 to 2 and 4 to 5, wherein the high temperature solvent oil has a paraffin content of 5wt% or less, a naphthene content of 7wt% or less, and an aromatic hydrocarbon content of 75wt% or more, based on the total amount of the high temperature solvent oil;

and/or, based on the total amount of the medium temperature solvent oil, the paraffin content in the medium temperature solvent oil is less than or equal to 6wt%, the naphthene content is less than or equal to 30wt%, and the arene content is more than or equal to 60wt%.

7. The rust inhibitive base oil according to any one of claims 1 to 2 and 4 to 5, wherein the narrow boiling range distillate has a boiling range width of 60 to 80 ℃.

8. A metal rust preventive oil comprising the rust preventive base oil according to any one of claims 1 to 7.

9. The metal rust inhibitive oil of claim 8, further comprising an auxiliary agent selected from at least one of rust inhibitors, stabilizers, film forming agents, diluents, and corrosion inhibitors.

10. The metal rust inhibitive oil according to claim 9, wherein the content of the auxiliary agent is 0.1 to 50% by weight based on the total amount of the metal rust inhibitive oil.