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CN-121991724-A - Method for purifying aromatic-rich raw material with high yield, purified aromatic-rich raw material and system for purifying aromatic-rich raw material with high yield

CN121991724ACN 121991724 ACN121991724 ACN 121991724ACN-121991724-A

Abstract

The invention provides a method for purifying aromatic-rich raw materials with high yield, a system for purifying aromatic-rich raw materials with high yield, wherein in the method, atmospheric and vacuum distillate oil is added into catalytic slurry oil to play a role in dilution and dissolution, after the catalytic slurry oil is dissolved, solid particles adsorbed on aromatic-rich components, colloid and asphaltene in the catalytic slurry oil are dissolved and dispersed, and the method is easy to filter, and is also beneficial to the steps of subsequent distillation and removal of light components, concentration of aromatic-rich components, combination of hydrofining and the like of the purified aromatic-rich raw materials, so that the finally obtained purified aromatic-rich raw materials have low solid content and high aromatic content, and can be used as raw materials for producing mesophase asphalt or petroleum coke or chemical products. The method for producing the clean aromatic-rich raw material at high yield provided by the invention has no limit on solid particles and content in the slurry oil, and can also process and treat the catalytic slurry oil of a high-solid high-viscosity system.

Inventors

  • YANG XING
  • E YUHENG
  • WANG LITAO
  • LIU YINDONG
  • ZHANG XIAO
  • WANG LUHAI
  • PANG WEIWEI
  • GE SHAOHUI
  • YU ZHIMIN
  • ZHANG BO

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (11)

  1. 1. The method for purifying the aromatic-rich raw material with high yield is characterized by comprising the following steps of: sequentially carrying out solid removal, component concentration, solvent extraction, hydrofining and separation on the mixed oil of the catalytic slurry oil and the atmospheric and vacuum distillate oil to obtain a clean aromatic-rich raw material; The method comprises the steps of separating solids from the components, wherein the solids removal is selected from membrane filtration, the components are concentrated and selected from reduced pressure distillation, and the temperature of the reduced pressure distillation is 300-420 ℃.
  2. 2. The method according to claim 1, wherein the atmospheric and vacuum distillate is at least one of normal second-line oil, normal third-line oil and first-line reduction oil, and preferably the mass content of the catalytic slurry oil in the mixed oil is 10% -99%.
  3. 3. The method according to claim 1 or 2, wherein the solids content of the de-solidified oil blend is less than or equal to 100ppm.
  4. 4. The method according to claim 1 or 2, wherein the membrane filtration device comprises 2-5 filtration modules, preferably the membrane filtration device comprises 5 filtration modules, and the filtration precision of each filtration module is respectively 80 mesh, 100 mesh, 160 mesh, 800 mesh and 800 mesh.
  5. 5. The method of claim 1, wherein the solvent used for the solvent extraction is selected from at least one of dimethyl sulfoxide, N-dimethylformamide, N-methylpyrrolidone, dimethylacetamide, triethylene glycol, sulfolane, and furfural; the temperature of the solvent extraction is 50-120 ℃, the pressure is 0.03-0.2 MPa, the solvent-oil ratio is 1:1-6:1, and the extraction time is 5-60 min.
  6. 6. The method according to claim 1, wherein the hydrofining conditions comprise a hydrogen pressure of 5-10 MPa, a temperature of 280-420 ℃, a hydrogen-oil volume ratio of 300-1600 and a volume space velocity of 0.1-1.2 h -1 ; Preferably, the hydrofining catalyst is selected from a hydrodesulfurization catalyst and a hydrodenitrogenation catalyst, and the volume ratio of the hydrodesulfurization catalyst to the hydrodenitrogenation catalyst is 1.5-2.0:1.
  7. 7. The method according to claim 1, wherein the separation is selected from membrane filtration, preferably the means of membrane filtration comprises two filtration modules, each filtration module having a filtration accuracy of 30 mesh and 160 mesh, respectively.
  8. 8. The cleaned aromatic-rich raw material obtained by the method for producing the cleaned aromatic-rich raw material with high yield according to any one of claims 1 to 7, wherein the solid content of the cleaned aromatic-rich raw material is less than or equal to 20ppm, the maximum solid content particle size is less than 100 microns, the sulfur content is less than 0.5%, and the aromatic hydrocarbon content is 55% -99%.
  9. 9. A system for purifying aromatic-rich raw materials with high yield comprises a solid removing unit, a component concentrating unit, a solvent extracting unit, a hydrofining unit and a filtering unit which are sequentially communicated; Wherein the solid removing unit adopts a membrane filtering device, and the component concentrating unit adopts a reduced pressure distillation device.
  10. 10. The system of claim 9, wherein the solids removal unit is configured to remove solids having a particle size of 20-180 microns or more, preferably the membrane filtration device comprises 2-5 filtration modules, more preferably the membrane filtration device comprises 5 filtration modules, and the filtration accuracy of each filtration module is 80 mesh, 100 mesh, 160 mesh, 800 mesh and 800 mesh.
  11. 11. The system of claim 9 or 10, wherein the solvent extraction unit comprises an extraction column, a rectifying column and a product tank which are sequentially communicated, wherein the reduced pressure distillation device is communicated with the extraction column, and the product tank is communicated with the hydrofining unit; the hydrofining unit comprises a fixed bed hydrogenation reactor, preferably, the upper part of the fixed bed reactor is filled with a hydrodesulfurization catalyst, and the lower part of the fixed bed reactor is filled with a hydrodenitrogenation catalyst; the filtering unit comprises two filtering modules, and preferably, the filtering precision of the two filtering modules is 30 meshes and 160 meshes respectively.

Description

Method for purifying aromatic-rich raw material with high yield, purified aromatic-rich raw material and system for purifying aromatic-rich raw material with high yield Technical Field The invention relates to the technical field of petrochemical industry, in particular to a method for purifying an aromatic-rich raw material with high yield, the aromatic-rich raw material with high purity and a system for purifying the aromatic-rich raw material with high yield. Background Catalytic slurry is a cracked heavy oil derived from fossil fuel petroleum, a low value byproduct. At present, oil refining enterprises often use slurry oil thrown out from the oil refining enterprises as blend oil of fuel oil or raw material of delayed coking, and the slurry oil is sold at lower price. Although the method solves the problem of the oil slurry in a short time, a large amount of aromatic hydrocarbon components contained in the oil slurry are valuable chemical raw materials with extremely high economic value. Meanwhile, a large amount of micron-sized catalyst particles contained in the slurry oil can cause serious environmental pollution when being used as fuel for combustion. The solid content in the catalytic slurry oil is removed, a large amount of clean aromatic hydrocarbon components are extracted, and the catalytic slurry oil can be used for processing and producing raw materials of mesophase pitch or petroleum coke or chemical products, and further can be used for high-yield carbon materials or chemical products such as carbon fibers or negative electrode materials, and the like, so that high economical utilization is realized. At present, the catalytic slurry oil solid removal technology mainly comprises modes of sedimentation separation, filtration separation, electrostatic separation, centrifugal separation and the like. For example, chinese patent document CN115305110A discloses a catalytic slurry oil removing agent composition and a preparation method of the catalytic slurry oil removing agent, wherein the catalytic slurry oil removing agent composition comprises 10% -25% of amide, 25% -40% of first organic raw materials, 20% -50% of nonionic flocculant and 5% -40% of solvent, and the first organic raw materials comprise higher fatty acid and/or higher fatty acid salt. The anionic coagulant is a series of products of the reaction of the amide and the higher fatty acid and/or the higher fatty acid salt, and the anionic coagulant adopted by the method can destroy the double-layer structure of the catalyst particles under a small dosage, overcomes the dispersion effect of the catalyst powder and ensures that the catalyst particles are more easily agglomerated into small agglomerates. However, the flocculant has a large difference in practical application due to insufficient removal depth and efficiency. Chinese patent document CN213202926U discloses a catalytic cracking slurry oil stripping system, which comprises a housing, the upper surface fixedly connected with driving motor of casing, driving motor's output fixedly connected with pivot, the surface fixedly connected with driving gear of pivot, the surface fixedly connected with of pivot has a plurality of spoilers, fixedly connected with circular slide rail between the inside left side wall and the right side wall of casing, the inside sliding connection of circular slide rail has the slider, the lower surface of slider is connected with the copper electrode through the bearing rotation. This catalytic cracking slurry oil takes off solid system, through the driving motor who sets up, driving motor drives the pivot rotation, and the pivot drives the bent axle rotation, drives the connecting rod motion through the axle sleeve that sets up, and the connecting rod passes through the riser, and the pulling stuffing box rocks, makes the material discharge of jam in the through-hole to reach anti-clogging purpose. However, the technology mainly discharges solid particles in the slurry oil mechanically, and the device is used for fixing a template, so that fine solids can not be removed completely. The existing method for extracting aromatic hydrocarbon in the catalytic slurry oil mainly comprises extraction, hydrotreatment and the like. For example, chinese patent document CN112852464a discloses a pretreatment method of raw oil for preparing spinnable mesophase pitch and high-performance pitch-based carbon fiber, which uses heavy fraction with a temperature greater than 300 ℃ of one or more of aromatic hydrocarbon-rich heavy oil, catalytic cracking slurry oil, coal tar or ethylene tar as raw material, carries out filtration and deashing coupling enhanced extraction process under ultrasonic assistance, and further realizes flexible modulation of refined raw material structural composition by gel permeation chromatography technology, thus obtaining high-quality aromatic-rich raw oil with narrower molecular weight distribution. However, the raw materials in the technolog