CN112552959A - Method and apparatus for pretreating raw material for producing needle coke - Google Patents

Method and apparatus for pretreating raw material for producing needle coke Download PDF

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Publication number
CN112552959A
CN112552959A CN201910914676.4A CN201910914676A CN112552959A CN 112552959 A CN112552959 A CN 112552959A CN 201910914676 A CN201910914676 A CN 201910914676A CN 112552959 A CN112552959 A CN 112552959A
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Prior art keywords
oil
feedstock
needle coke
slurry bed
hydrogenation catalyst
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CN201910914676.4A
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Chinese (zh)
Inventor
廉勇
韦丹华
张奎山
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Honeywell Performance Materials and Technologies China Co Ltd
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Honeywell Performance Materials and Technologies China Co Ltd
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Priority to CN201910914676.4A priority Critical patent/CN112552959A/en
Publication of CN112552959A publication Critical patent/CN112552959A/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G67/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only
    • C10G67/02—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities
    • C10G2300/202—Heteroatoms content, i.e. S, N, O, P
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/70—Catalyst aspects

Abstract

The invention relates to a method and a device for pretreating raw materials for producing needle coke. The pretreatment method comprises the steps of carrying out slurry bed hydrotreating on raw oil containing a hydrogenation catalyst to remove heteroatoms such as sulfur, nitrogen and the like to obtain a hydrogenation product, and removing non-ideal components from the hydrogenation product to obtain a raw material for producing the needle coke. The pretreatment method can effectively remove light and heavy non-ideal components in the raw oil and reserve ideal components to the maximum extent by combining the two processes, and the treated raw oil meets the requirements of raw materials for producing needle coke.

Description

Method and apparatus for pretreating raw material for producing needle coke
Technical Field
The invention belongs to the technical field of chemical raw material purification. In particular, the present invention relates to a method and apparatus for pretreating a feedstock for use in the production of needle coke.
Background
The needle coke has the advantages of low thermal expansion coefficient, high crystallization degree, high conductivity and the like, and the pores in the coke block are uniformly oriented and are in a slender oval shape. Needle coke is an important raw material for producing graphite electrodes with ultrahigh power and high power.
According to the mechanism of needle coke formation, catalytic cracking slurries are good feedstocks for needle coke production in terms of molecular structure, but solid particulates, sulfur, nitrogen, and other unstable components must be removed before use in the production of needle coke.
There are a number of prior patent applications that disclose pretreatment methods for feedstocks used to produce needle coke.
CN1382761A discloses a method for producing needle coke by catalytic cracking of decant oil, wherein catalyst powder in the catalytic cracking decant oil is removed by an extraction method, and then the needle coke is produced by delayed coking. However, this method is mainly used for removing catalyst fines, cannot remove carbonaceous particles, sulfur, nitrogen and other unstable components in the catalytic cracking slurry, and requires special equipment for processing the raw material, and the production process is complicated and time-consuming, and has high production cost.
CN106147835A discloses a pretreatment method of raw materials for producing needle coke, wherein raw oil is firstly contacted with C3-C5 light hydrocarbon fraction as an extraction solvent to carry out subcritical or supercritical extraction on catalytic cracking slurry oil, the obtained extraction oil phase is subjected to supercritical recovery of the solvent to prepare extraction components, the extraction components are used as raw materials for preparing the needle coke, mesophase pitch is prepared through thermal polycondensation, and then the mesophase pitch is subjected to delayed coking reaction to prepare high-quality oil-based needle coke. However, this process does not remove carbonaceous particulates, sulfur, nitrogen, and other unstable components from the catalytic cracking slurry.
CN104927899A discloses a method for processing raw material for producing needle coke, wherein raw material oil is firstly contacted with hydrogen and a hydrogenation catalyst bed layer, and hydrogenation products are separated to obtain the raw material for producing needle coke, wherein the raw material oil can be catalytic cracking slurry oil or clarified oil. However, in this process the fixed bed hydrogenation catalyst bed is easily clogged by solid particles in the slurry oil and this leads to frequent shut-downs of the plant for replacement of new catalyst, which can be time consuming and increases costs.
CN1872963A discloses a pretreatment method of raw material for producing needle coke, wherein raw oil is subjected to reduced pressure distillation to remove non-ideal components, the rest ideal components are contacted with hydrogen and a hydrogenation catalyst bed, and hydrogenation products are separated to obtain the raw material for producing the needle coke, wherein the raw oil can be catalytic cracking slurry oil or clarified oil. The method can remove light and heavy non-ideal components in the raw oil by combining the two processes, retain ideal components to the maximum extent, and the treated raw oil meets the requirements of producing needle coke raw materials. However, in this process the fixed bed hydrogenation catalyst bed is easily clogged by solid particles remaining in the slurry oil and this leads to frequent shut-downs of the plant for replacement of new catalyst, which can be time consuming and increases costs.
Accordingly, there remains a need in the art for a method of pretreating feedstock for needle coke production that overcomes the above-mentioned disadvantages of the prior art.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for pretreating raw materials for producing needle coke, which can effectively remove impurities in the raw materials, such as catalyst particles, carbonaceous particles, sulfur, nitrogen and other heteroatoms, and retain ideal components for producing the needle coke, so that the subsequently obtained needle coke has good quality, low production cost and high speed.
Thus, according to a first aspect of the present invention, there is provided a process for the pretreatment of feedstock for the production of needle coke, comprising:
subjecting the feedstock containing hydrogenation catalyst to slurry bed hydrogenation to remove heteroatoms such as sulfur and nitrogen to obtain hydrogenation product, and
removing undesired components from the hydrogenation product to obtain a feedstock for needle coke production.
According to a second aspect of the present invention, there is provided a pretreatment apparatus for a raw material for producing needle coke, comprising:
mixing equipment for uniformly mixing the hydrogenation catalyst in the raw oil to obtain the raw oil containing the hydrogenation catalyst,
a slurry bed hydrotreater downstream of the mixing device for removing hetero atoms such as sulfur and nitrogen from the feed oil containing the hydrogenation catalyst to obtain a hydrogenated product, and
a separation device downstream of the slurry bed hydroprocessing device for removing undesired components from the hydrogenated product to yield a feedstock for needle coke production.
The pretreatment method can effectively remove light and heavy non-ideal components in the raw oil and reserve ideal components to the maximum extent by combining the two processes, and the treated raw oil meets the requirements of raw materials for producing needle coke. The pretreatment apparatus according to the present invention can be used to effectively carry out the pretreatment method of the present invention.
Drawings
The method and apparatus for pretreating a raw material for producing needle coke according to the present invention will be described with reference to the accompanying drawings, in which:
fig. 1 schematically shows a pretreatment apparatus for a raw material for producing needle coke according to an aspect of the present invention, wherein 1: a mixing device; 2: slurry bed hydroprocessing equipment; 3: and (4) separating equipment.
Detailed description of the preferred embodiments
The technical solution of the present invention is described in more detail below.
According to a first aspect of the present invention, there is provided a pretreatment method of a raw material for producing needle coke, comprising:
subjecting the feedstock containing the hydrogenation catalyst to slurry bed hydroprocessing to remove heteroatoms such as sulfur and nitrogen to obtain a hydrogenated product, and
removing undesired components from the hydrogenation product to obtain a feedstock for needle coke production.
In some embodiments, the feed oil may be a catalytically cracked slurry or clarified oil.
In some embodiments, the process further comprises adding a hydrogenation catalyst to the feedstock to yield a feedstock containing a hydrogenation catalyst.
The hydrogenation catalyst can be various catalysts with hydrogenation catalysis effect commonly used in the field of slurry bed hydrogenation, and is selected from oil-soluble hydrogenation catalysts, water-soluble hydrogenation catalysts and combinations thereof.
Preferably, the hydrogenation catalyst is a metal sulfide, the metal being selected from the group consisting of Ni, Mo, Fe, Co, W, and combinations thereof. More preferably, the hydrogenation catalyst is a combination of molybdenum sulphide and nickel sulphide, and even more preferably wherein the ratio of molybdenum sulphide to nickel sulphide is 1: 1, by weight of metal atoms.
The hydrogenation catalyst is non-supported.
Preferably, the mass ratio of hydrogenation catalyst to feedstock oil is between 1 and 2000. mu.g/g, more preferably between 50 and 1000. mu.g/g, wherein the hydrogenation catalyst is based on the weight of metal atoms.
Preferably, the volume ratio of the hydrogen to the raw oil is between 100-2000, and more preferably between 200-1000.
Preferably, the hydrotreating is carried out at a temperature of 350-.
In some embodiments, undesired components are removed from the hydrogenated product by distillation under reduced pressure.
The reduced pressure distillation may be one-stage or multi-stage distillation.
Preferably, the reduced pressure distillation is carried out at an absolute pressure of 0.1 to 6KPa and a temperature of 320-380 deg.C, more preferably at an absolute pressure of 0.2 to 5KPa and a temperature of 330-370 deg.C.
Preferably, the LHSV (liquid hourly space velocity) of the feed oil is in the range of 0.1-5hr-1More preferably 0.2-4hr-1In the meantime.
In the slurry bed hydroprocessing process, a fixed catalyst bed is not needed because the catalyst is already dispersed in the raw oil.
In the slurry bed hydrotreating process, heteroatoms such as sulfur, nitrogen, etc. are removed without destruction of aromatic structures necessary for obtaining needle coke, the viscosity of the feedstock oil is reduced and the stability is improved, and the reduction in viscosity of the feedstock oil enables effective removal of catalyst particles.
After the hydrogenation product is separated by reduced pressure distillation to remove non-ideal components, the ideal components are left, the distillation range of which is between 340 ℃ and 460 ℃, and the ideal components can be used as raw materials for producing needle coke.
The non-ideal components include heavy non-ideal components such as asphaltenes, gums and ashes and light non-ideal components such as diesel fractions. Wherein the light non-ideal components are separated from the top of the tower as atmospheric gas oil, the heavy non-ideal components are separated from the bottom of the tower as bottom oil (including vacuum residue, solid particles and heteroatoms), and the bottom oil (without any post-treatment) can be mixed with the raw oil which is not subjected to hydrotreatment and contains hydrogenation catalyst for hydrotreatment.
By the process of the present invention, inexpensive raw oil (heavy oil) can be converted into a product of higher value, i.e., a raw material for producing needle coke.
According to a second aspect of the present invention, there is provided a pretreatment apparatus for a raw material for producing needle coke, comprising:
mixing equipment for uniformly mixing the hydrogenation catalyst in the raw oil to obtain the raw oil containing the hydrogenation catalyst,
a slurry bed hydrotreater downstream of the mixing device for removing hetero atoms such as sulfur and nitrogen from the feed oil containing the hydrogenation catalyst to obtain a hydrogenated product, and
a separation device downstream of the slurry bed hydroprocessing device for removing undesired components from the hydrogenated product to yield a feedstock for needle coke production.
There is no particular requirement for the mixing apparatus, slurry bed hydroprocessing apparatus and separation apparatus as long as they can perform each step in the pretreatment method according to the present invention separately.
The slurry bed hydrotreatment equipment which can be used for implementing the method of the invention has a simpler structure, for example, the slurry bed hydrotreatment equipment can be an empty cylinder reactor with simple internal components (such as a guide cylinder or a distributor, which plays a role in improving the distribution of material flow), and the catalyst is uniformly dispersed in the raw oil and passes through the reactor once, so that the bed layer blockage phenomenon which often occurs in a fixed bed hydrogenation reactor does not exist.
For example, the separation apparatus may be a distillation apparatus.
A pretreatment apparatus for a raw material for producing needle coke according to an embodiment of the present invention is exemplarily shown in fig. 1, which includes:
a mixing device 1 for uniformly mixing the hydrogenation catalyst in the raw oil to obtain the raw oil containing the hydrogenation catalyst,
a slurry bed hydrotreatment unit 2 downstream of the mixing unit 1 for removing hetero atoms such as sulfur, nitrogen and the like from the feed oil to obtain a hydrogenated product, an
A separation unit 3 downstream of the slurry bed hydrotreatment unit 2 for removing undesirable components from the hydrogenated product to yield a feedstock for needle coke production.
The mixing apparatus 1 is in fluid communication with a slurry bed hydroprocessing apparatus 2, and the slurry bed hydroprocessing apparatus 2 is in fluid communication with a separation apparatus 3.
The mixing device 1 has a stock oil inlet 11, a catalyst inlet 12 and a stock oil outlet 13,
the slurry bed hydrotreater 2 has a raw oil inlet 21, a hydrogen inlet 22, and a hydrogenated product outlet 23.
The separation device 3 has a hydroprocessed product inlet 31, an atmospheric gas oil outlet 32, a bottoms outlet 33, and a needle coke feedstock outlet 34.
The separation apparatus 3 may be one or more stages of vacuum distillation columns commonly used in the art.
The feed oil outlet 13 of the mixing device 1 is in fluid communication with the feed oil inlet 21 of the slurry bed hydrotreatment device 2.
The hydrogenated product outlet 23 of the slurry bed hydrotreater 2 is in fluid communication with the hydrogenated product inlet 31 of the separation device 3.
The bottoms outlet 34 may be in fluid communication with the feedstock inlet 21 of the slurry bed hydrotreatment unit 2 to deliver bottoms from the bottoms outlet 33 to the feedstock inlet 21 where it joins the feedstock containing the hydrogenation catalyst and enters the slurry bed hydrotreatment unit 2.
Thus, in some embodiments, the bottoms outlet 33 of the separation apparatus 3 is in fluid communication with the feed oil inlet 21 of the slurry bed hydroprocessing apparatus 2.
With continued reference to fig. 1, during the pretreatment of the feedstock oil, the feedstock oil and the hydrogenation catalyst are respectively conveyed into the mixing device 1 through the feedstock oil inlet 11 and the catalyst inlet 12 of the mixing device 1, and the hydrogenation catalyst is uniformly mixed with the feedstock oil in the mixing device 1 to obtain the feedstock oil containing the hydrogenation catalyst.
And then, the raw oil containing the hydrogenation catalyst is conveyed from the mixing device 1 to the slurry bed hydrotreatment device 2 through the raw oil outlet 13 of the mixing device 1 and the raw oil inlet 21 of the slurry bed hydrotreatment device 2, hydrogen enters the slurry bed hydrotreatment device 2 from the hydrogen inlet 22 of the slurry bed hydrotreatment device 2, and the slurry bed hydrotreatment is carried out in the slurry bed hydrotreatment device 2 to remove heteroatoms such as sulfur, nitrogen and the like, so that a hydrogenation product is obtained.
The hydrogenated product is then transferred from the slurry hydroprocessing apparatus 2 to the separation apparatus 3 via the hydrogenated product outlet 23 of the slurry hydroprocessing apparatus 2 and the hydrogenated product inlet 31 of the separation apparatus 3, and the undesired components are removed in the separation apparatus 3 (e.g., distillation apparatus) to leave the desired components, and atmospheric gas oil, bottom oil and needle coke feedstock are discharged via the atmospheric gas oil outlet 32, bottom oil outlet 33 and needle coke feedstock outlet 34, respectively.
The bottom oil from the bottom oil outlet 33 can be delivered to join with the feedstock containing the hydrogenation catalyst and then delivered to the slurry bed hydrotreatment device 2 through the feedstock inlet 21 of the slurry bed hydrotreatment device 2.
In the present specification and claims, where a term is referred to, it is understood that the term has any definition set forth in the specification of the application for that term unless a definition clearly contradicts the context of the term.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event that a definition of a term in this specification conflicts with a meaning commonly understood by those skilled in the art to which the invention pertains, the definition set forth herein shall govern.
Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities, percentages, and so forth, in the specification and claims are to be understood as being modified in all instances by the term "about".
The terms "comprising" and "including" used in the specification of the present application encompass the case where other elements not explicitly mentioned are also contained or included and the case where they are composed of the elements mentioned.
The idea and technical effects of the present invention will be further described below with reference to the embodiments and the accompanying drawings so that those skilled in the art can fully understand the objects, features and effects of the present invention.
Examples
The idea and technical effects of the present invention will be further described below with reference to the embodiments and the accompanying drawings so that those skilled in the art can fully understand the objects, features and effects of the present invention. It will be understood by those skilled in the art that the embodiments herein are for illustrative purposes only and the scope of the present invention is not limited thereto.
Example 1
Referring to fig. 1, a feedstock oil (catalytic cracking slurry oil, each performance parameter of which is shown in table 1) is first fed into a mixing apparatus 1, and a hydrogenation catalyst (molybdenum sulfide and nickel sulfide, in a ratio of 1: 1, based on the weight of metal atoms) is added to the feedstock oil in the mixing apparatus 1 to obtain a feedstock oil containing the hydrogenation catalyst.
And then, conveying the raw oil containing the hydrogenation catalyst to a slurry bed hydrotreatment device 2, and carrying out slurry bed hydrotreatment in the slurry bed hydrotreatment device 2 to remove heteroatoms such as sulfur, nitrogen and the like to obtain a hydrogenation product.
The hydrogenation product is then fed to a distillation apparatus 3 where a reduced pressure distillation is carried out in the distillation apparatus 3 to remove the undesired components and leave the desired components with a distillation range of between 340 ℃ and 460 ℃.
Wherein:
the volume ratio of the hydrogen to the raw oil is 1000;
the mass ratio of the hydrogenation catalyst to the raw oil is 400 mug/g;
the temperature of the hydrotreatment is 400 ℃;
the pressure of the hydrotreatment is 8 MPa;
the vacuum degree during reduced pressure distillation is 3 KPa;
the reduced pressure distillation temperature is 350 ℃;
LHSV of feed oil (liquid time space)Fast) is 1hr-1。
The properties of the resulting feedstock for needle coke production are summarized in table 1.
Comparative example 1
The same feed oil as in example 1 was fed to a distillation apparatus, and distillation under reduced pressure was carried out in the distillation apparatus under the following conditions.
Wherein:
the vacuum degree during reduced pressure distillation is 3 KPa;
the reduced pressure distillation temperature is 350 ℃;
LHSV (liquid hourly space velocity) of the feed oil is 1hr-1。
The properties of the treated feed oil are summarized in Table 1.
Table 1: comparison of Properties of vacuum-distilled feedstock oil obtained in comparative example 1 and hydrotreated and vacuum-distilled feedstock oils obtained in example 1
Item Raw oil Example 1 Comparative example 1
Density (20 ℃ C.), g/cm3 1.1184 1.0964 1.1007
Viscosity (50 ℃ C.), mm2/s 1714.05 87.62 155.43
Molecular weight (VPO method) 296 205 230
Ash content, μ g/g 3300 89.1 675.6
Saturated hydrocarbon, m% 8.26 9.58 8.61
Aromatic hydrocarbon, m% 70.23 90.19 88.43
Asphaltenes, m% 5.09 0.02 1.13
Colloid, m% 16.42 0.21 1.83
Sulfur content, m% 1.21 0.45 0.99
Carbon content, m% 90.15 90.45 90.11
Hydrogen content, m% 7.80 8.49 7.99
The content of N is m% 0.93 0.59 0.88
As can be seen from the results in table 1, the pretreatment method according to the present invention can effectively remove light and heavy undesired components in the raw oil and maximally retain desired components by a combination of the two processes.
As can be seen by comparing with the index requirements of the raw material for needle coke of table 2 below, the raw material oil treated by the pretreatment method according to the present invention satisfies the requirements of the raw material for needle coke production, and can be used as the raw material for needle coke production.
Table 2: requirements of raw materials for producing needle coke
Item Index (I)
Density (20 ℃ C.), g/cm3 Greater than 1.03
Ash content in ppm Less than 100
Aromatic hydrocarbon, m% Greater than 45
Asphaltenes, m% Less than 1
Sulfur content, m% Less than 0.5
Although a few aspects of the present invention have been shown and discussed, it would be appreciated by those skilled in the art that changes may be made in this aspect without departing from the principles and spirit of the invention, the scope of which is therefore defined in the claims and their equivalents.

Claims (12)

1. A process for pretreating a feedstock for producing needle coke, comprising:
subjecting the feedstock containing hydrogenation catalyst to slurry bed hydrogenation to remove heteroatoms such as sulfur and nitrogen to obtain hydrogenation product, and
removing undesired components from the hydrogenation product to obtain a feedstock for needle coke production.
2. The method according to claim 1, wherein the raw oil is a catalytically cracked slurry oil or a clarified oil.
3. The process of claim 1 or 2, wherein the hydrogenation catalyst is a metal sulfide, the metal being selected from the group consisting of Ni, Mo, Fe, Co, W, and combinations thereof, preferably the hydrogenation catalyst is a combination of molybdenum sulfide and nickel sulfide.
4. Process according to any one of claims 1 to 3, characterized in that the mass ratio of hydrogenation catalyst to feedstock oil is between 1 and 2000 μ g/g, preferably between 50 and 1000 μ g/g, with hydrogenation catalyst being based on the weight of metal atoms.
5. The process according to any one of claims 1 to 4, wherein the volume ratio of hydrogen to feedstock oil is between 100-2000, preferably between 200-1000.
6. Process according to any one of claims 1 to 5, characterized in that the hydrotreatment is carried out at a temperature of 350-.
7. Process according to any one of claims 1 to 6, characterized in that undesired components are removed from the hydrogenation product by distillation under reduced pressure, the distillation under reduced pressure being carried out at an absolute pressure of from 0.1 to 6KPa and a temperature of 320 and 380 ℃, preferably at an absolute pressure of from 0.2 to 5KPa and a temperature of 330 and 370 ℃.
8. The method according to any one of claims 1 to 7, wherein the LHSV of the feedstock oil is in the range of 0.1-5hr-1Preferably 0.2-4hr-1In the meantime.
9. A pretreatment device for a raw material for producing needle coke, characterized by comprising:
a mixing device (1) for uniformly mixing the hydrogenation catalyst in the raw oil to obtain the raw oil containing the hydrogenation catalyst,
a slurry bed hydrotreatment device (2) downstream of the mixing device (1) for removing heteroatoms such as sulfur and nitrogen from the feedstock containing the hydrogenation catalyst to obtain a hydrogenated product, and
a separation device (3) downstream of the slurry bed hydrotreatment device (2) for removing undesired components from the hydrogenated product to obtain a feedstock for needle coke production.
10. The pretreatment apparatus according to claim 9, wherein the mixing device (1) is in fluid communication with the slurry bed hydroprocessing device (2) and the slurry bed hydroprocessing device (2) is in fluid communication with the separation device (3), preferably the separation device (3) is a distillation device.
11. The pretreatment apparatus according to claim 9 or 10,
the mixing device (1) is provided with a raw oil inlet (11), a catalyst inlet (12) and a raw oil outlet (13);
the slurry bed hydrotreatment device (2) is provided with a raw oil inlet (21), a hydrogen inlet (22) and a hydrogenated product outlet (23);
the separation device (3) is provided with a hydrogenation product inlet (31), an atmospheric gas oil outlet (32), a bottom oil outlet (33) and a needle coke raw material outlet (34);
wherein the content of the first and second substances,
a raw oil outlet (13) of the mixing device (1) is in fluid communication with a raw oil inlet (21) of the slurry bed hydrotreatment device (2);
the hydrogenated product outlet (23) of the slurry bed hydrotreatment unit (2) is in fluid communication with the hydrogenated product inlet (31) of the separation unit (3).
12. The pretreatment apparatus according to claim 11, wherein a bottoms outlet (33) of the separation device (3) is in fluid communication with a feedstock oil inlet (21) of the slurry bed hydrotreatment device (2).
CN201910914676.4A 2019-09-25 2019-09-25 Method and apparatus for pretreating raw material for producing needle coke Pending CN112552959A (en)

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CN201910914676.4A CN112552959A (en) 2019-09-25 2019-09-25 Method and apparatus for pretreating raw material for producing needle coke

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WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20210326