CN110760332A

CN110760332A - System for removing sulfide in oil product through cyclone reinforcement

Info

Publication number: CN110760332A
Application number: CN201911005464.0A
Authority: CN
Inventors: 胡军; 杨强; 刘洪来; 汪华林
Original assignee: East China University of Science and Technology
Current assignee: East China University of Science and Technology
Priority date: 2017-07-27
Filing date: 2017-07-27
Publication date: 2020-02-07
Also published as: CN107227170A

Abstract

The invention belongs to the fields of petrochemical industry and environmental protection, and relates to a system for performing adsorption desulfurization and synchronous separation treatment on an oil product by using an adsorbent. The desulfurization method of the system comprises the following steps: step (1) adsorption desulfurization; separating the adsorbent in the step (2); and (3) regenerating the adsorbent. The invention can quickly and efficiently adsorb the sulfide in the oil product under the strengthening action of the swirling flow field based on the stronger adsorption action of the adsorbing material and the thiophene sulfide; meanwhile, the adsorbent can be quickly and efficiently separated from the oil in the cyclone; the separated adsorbent is recycled through oxidation or extraction regeneration. The system has the characteristics of quick adsorption and high-efficiency separation, the regenerated adsorbent is simple to operate, the equipment is simple to operate, the occupied area is small, the problems of complex process, high cost, high control requirement and the like of the traditional hydrodesulfurization high-temperature high-pressure and subsequent amine absorption desulfurization are solved, and the system can be widely applied to the oil product desulfurization treatment process.

Description

System for removing sulfide in oil product through cyclone reinforcement

The application of the invention is the name: a system for removing sulfide in oil products by cyclone reinforcement, which is applied in the patent application number: 201710621811.7 parent application, filed 2017-7-27.

Technical Field

The invention belongs to the fields of petrochemical industry and environmental protection, and relates to a system for performing adsorption desulfurization and synchronous separation treatment on an oil product by using an adsorbent.

Background

The petroleum products contain a large amount of sulfide, and the combustion process can be oxidized into SO_xAnd the environment is greatly damaged by the emission, haze, acid rain and the like. Meanwhile, the existence of sulfides in oil products also causes the deterioration of the quality of fuel oil, corrodes candle apparatuses and causes safety hazard to the petroleum processing technology. In order to realize cleaner fuel oil products, a series of fuel oil sulfur content standards are formulated in all countries around the world, so as to limit the emission of sulfides in fuel oil. The developed countries in Europe and America and national standards V and VI of gasoline and diesel oil both definitely stipulate that the sulfur content is lower than 10 ppm. Deep desulfurization of fuel oils to ultra clean fuel oils with sulfur levels below 10ppm has been a global trend.

The sulfur compounds in petroleum fraction products with different distillation ranges have obvious distribution rules: the lower molecular weight, easier to remove elemental sulfur, mercaptans, etc. are distributed mainly in the lower boiling (<280 ℃) light fraction; aromatic heterocyclic sulfides with high molecular weight and difficult removal, such as benzothiophene (BT, boiling point 220 deg.C), dibenzothiophene (DBT, boiling point 320 deg.C), and the like, are mainly distributed in heavy components with high boiling points (>280 deg.C), and as the distillation range temperature of the product fraction increases, the content of organic sulfur compounds with high boiling points, high molecular weight and difficult removal increases. Therefore, it is very important to remove thiophenic sulfur and its complex derivatives from petroleum products.

At present, the more mature and widely applied desulfurization method in the oil refining industry is hydrodesulfurization, and the technology can effectively remove most of small molecular sulfides such as mercaptan, thioether, disulfide and the like in fuel oil, but has certain limit on the reaction of aromatic organic thiophene sulfur. Meanwhile, the hydrodesulfurization equipment is expensive and the process is complex; a noble metal catalyst is needed in the reaction process, so that the reaction is easy to inactivate; the operation conditions are harsh and require high temperature and high pressure; and a certain loss of octane number can be caused, and in order to meet the increasing demand of the market on the ultra-low sulfur fuel oil, the research and development of an efficient non-hydrodesulfurization technology on the basis of the traditional hydrodesulfurization technology are reluctant.

The adsorption desulfurization is realized by utilizing physical or chemical adsorption to enrich sulfur in fuel oil on the surface and in pores of an adsorption material. The normal-temperature normal-pressure method has the advantages of mild operation conditions, low cost and environmental protection, and is considered as a potential deep desulfurization method. The enhancement of the adsorption of the thiophene sulfur by the adsorbent and the enhancement of the liquid-solid separation of the oil/the adsorbent in the adsorption desulfurization process are problems to be solved urgently in the technical development.

There are many sorbent materials reported so far [ RSC Advances,2014,4: 35302-]Mainly comprises modified molecular sieves, such as Ag developed by Chendao Hua and the like₂O/NaY (patent No. CN 103191697A), metal oxide/activated carbon composite developed by Cherokee and the like (patent No. CN 104028208A), metal oxide mixture developed by Lican and the like (patent No. CN 103721668A), and other novel porous materials (patent No. CN 106000297A). The metal organic framework Materials (MOFs) have special structures, can improve the adsorption performance of sulfur with organic sulfur through acid-base interaction, pi complexation, open metal sites (M-S bonds) and other interactions, and are expected to become excellent desulfurization adsorbents. The improvement of the pore structure of the adsorption material and the regulation and control of the surface adsorption activity of the adsorption material, thereby improving the selective adsorption desulfurization capacity and the adsorption rate, and improving the stability and the regeneration performance of the adsorption material is one of the keys of the adsorption desulfurization technology. The adsorption process adopted at present mainly comprises a fixed bed (patent number: CN104277877A), a fluidized bed (patent number: CN 102839011A) and a new combined mode (patent number: CN 105623733A), has the engineering problems of relatively low energy efficiency, entrainment of fine adsorbent particles of product oil and the like, and has great hidden trouble on the working efficiency of an engine and the like in the subsequent use process of oil products.

The cyclone field can make the absorbent particles and the oil product continuously collide and rotate, thereby strengthening dynamic adsorption, and meanwhile, the cyclone separation can directionally gather fine absorbent particle groups and separate from the oil product. In addition, in view of the high efficiency characteristic of the cyclone for fine particle separation, the adsorbent can adopt fine particles, thereby reducing the mass transfer resistance in the adsorption process and further strengthening the adsorption rate, so the cyclone technology is a novel process with great potential for coupling adsorption and liquid-solid separation. So far, no synergistic system capable of effectively realizing adsorption desulfurization and adsorbent separation has been developed in the art, and therefore, it is urgent to develop a new system for oil desulfurization having high efficiency, practicality and economy.

Disclosure of Invention

The invention provides a system for removing sulfides in an oil product by cyclone reinforcement, which aims to solve the problems in the prior art.

The specific technical scheme of the invention is as follows: a system for removing sulfides in oil products by rotational flow reinforcement comprises the following steps:

step (1), adsorption desulfurization: the absorbent absorbs the sulfide in the oil product; adding the adsorbent and the oil product into a pre-mixing adsorption unit and a liquid-solid suspension conveying unit, and uniformly mixing, wherein the pre-mixing adsorption unit comprises a sealed kettle with a stirrer, and mixing and adsorbing are completed; the adsorbent is fully contacted with the sulfide in the oil product for adsorption; then the mixture is conveyed by a material pump to enter a rotational flow system;

separating the adsorbent in the step (2): separating fine adsorbent particles by a cyclone method; oil containing the adsorbent enters a liquid-solid separation cyclone system unit, and operation parameters such as inlet flow, flow split ratio and the like are regulated and controlled, so that the adsorbent particles rotate and revolve in a micro-cyclone field, the adsorption desulfurization is further enhanced, and meanwhile, the liquid-solid separation of the adsorbent fine particles is realized. Low-sulfur product oil is obtained at the overflow port, a mixture of the high-solid-content adsorbent and the oil product obtained at the underflow port is partially back-mixed and recycled, and a part of the mixture enters a regeneration system;

the liquid-solid separation cyclone system unit comprises a single-stage or two-stage series cyclone; wherein the first cyclone of the series system is provided with an inlet for receiving the outlet mixed liquid of the mixed adsorption unit, an overflow port for discharging the oil product after the first-stage separation, and a bottom flow port for discharging the adsorbent after the first-stage separation; the oil product discharged from the overflow port enters a second cyclone for secondary separation, and an inlet is arranged for receiving the oil product discharged from the overflow port of the first cyclone, an overflow port is arranged for discharging the oil product after the secondary separation, and a bottom flow port is arranged for discharging the adsorbent after the secondary separation;

and (3) regenerating the adsorbent: adding an oxidant into the adsorbent adsorbing the thiophene sulfur according to an oxidation desulfurization mechanism, oxidizing the thiophene sulfur into sulfone, leaching with water, and dissolving and eluting the sulfone; or according to the extraction principle, dissolving and removing the adsorbed sulfur by adopting an organic solvent; drying to obtain a regenerated adsorbent, and adding the regenerated adsorbent into an adsorbent recovery and regeneration unit for recycling;

the adsorbent recovery and regeneration unit comprises a roller type centrifugal filtration separation kettle with a feed inlet, an oxidant solution or extractant solution storage tank and a solvent recovery tank; separating the adsorbent discharged from the bottom flow port of the cyclone from the oil product, and adding an oxidant solution or an extractant to perform oxidation regeneration or extraction regeneration on the adsorbent.

Further, the liquid-solid suspension conveying unit adopts a slurry pump.

Further, the adsorbent selected in the step (1) is Y-type molecular sieve, 13X molecular sieve, mesoporous molecular sieve, activated carbon, metal organic framework materials MOFs, porous organic polymers POPs, poly-porous ionic liquid PILs and the like.

Further, the adsorbent selected in the step (1) has the adsorption saturation sulfur capacity of 15-40 g/kg.

Further, the specific surface agent of the adsorbent selected in the step (1) is 150-1800m2/g, the pore volume is 0.35-1.1cm3/g, the density is 1.5-2.5g/cm3, and the average particle size is more than 30 um.

Further, the premixing kettle in the step (1) is provided with a stirrer, so that liquid and solid can be uniformly mixed, and the premixing kettle and the conveying system are sealed.

Further, the cyclone separation system in the step (2) can be a single-stage cyclone, and the cone angle is 5-25 degrees.

Further, the cyclone separation system in the step (2) can also combine cyclones in two stages in series. The method is respectively carried out in a mode that the small-angle swirler is connected in series with the large-angle swirler, the large-angle swirler is connected in series with the small-angle swirler, the equiangular swirler is connected in series with the small-angle swirler and the like.

Further, the concentration of the fed adsorbent particles in the adsorption cyclone separation process in the step (2) is 2-10%, the inlet flow is 0.2-1.0m3/h, and the split ratio of the bottom flow port and the overflow port is 5-12%.

Further, the back mixing and regeneration ratio of the high solid content adsorbent and the oil mixture obtained from the underflow port in the step (2) is 1:3-1: 1.

Further, in the adsorption cyclone separation process in the step (2), in order to meet the requirement of throughput, the cyclone system can be adopted to carry out parallel connection of multiple groups.

Further, the regeneration of the adsorbent in the step (3) is carried out in batch mode; filtering and separating the oil product by a centrifugal kettle, and then regenerating by oxidation or extraction; the oil product obtained by separation is low-sulfur finished oil.

Further, in the step (3), the adsorbent is oxidized and regenerated by using H2O2, NaClO or the like as an oxidizing agent, and the dosage of the oxidizing agent is (1-3) times of the dosage of n mol/g of the adsorbent according to the capacity (n mol/g) of the adsorbed sulfur.

Further, the adsorbent in the step (3) is oxidized and regenerated, an oxidant is added into the adsorbent without the oil product for reaction for 5-10 minutes, centrifugal filtration is carried out, then water leaching and filtration are carried out, and the process is repeated for three times.

Further, the adsorbent in the step (3) is extracted and regenerated, and can be extracted and washed by using solvents such as toluene, xylene and petroleum ether. The dosage of the extracting agent is 3-5L/kg of the adsorbent, and the filtering is repeated for three times.

Further, the adsorbent in the step (3) is subjected to oxidation regeneration or extraction regeneration, and then dried at the temperature of 120 ℃ and 150 ℃ for recycling.

Further, the unit two cyclone separation system selects a plurality of second-stage series cyclone units to carry out parallel operation according to the treatment capacity.

Furthermore, the unit of the unit two-cyclone separation system comprises two second-stage separation sections of two cyclones, each section is respectively provided with a flow control valve and a pressure gauge, and an adsorbent outlet is provided with a collector and a liquid level meter.

Furthermore, the three-unit adsorbent recovery and regeneration unit can selectively use the extraction solvent and the washing solvent for secondary purification according to the environmental protection requirement.

Advantageous effects

The adsorption and separation system adopted by the system disclosed by the invention is firstly based on the strong adsorption effect of the adsorption material and the organic sulfide, and can quickly and efficiently adsorb sulfide in an oil product under the strengthening effect of the rotational flow field; meanwhile, the adsorbent can be quickly and efficiently separated from the oil in the cyclone; the separated adsorbent is recycled through oxidation or extraction regeneration. In a preferred embodiment, when 5 percent of HKUST-1 by mass is used for carrying out adsorption desulfurization-cyclone separation on oil containing thiophenic sulfur, the sulfur content in the outlet oil is lower than 10ppm, the separation efficiency of the adsorbent HKUST-1 particles is over 99 percent, and the treatment period is less than 1 minute.

The system has the characteristics of quick adsorption and high-efficiency separation, the regenerated adsorbent is simple to operate, the equipment is simple to operate, the occupied area is small, the problems of complex process, high cost, high control requirement and the like of the traditional hydrodesulfurization high-temperature high-pressure and subsequent amine absorption desulfurization are solved, and the system can be widely applied to the oil product desulfurization treatment process.

Drawings

FIG. 1 is a schematic diagram of a system for desulfurization of oil products by swirl reinforcement.

Description of the symbols:

1 stirring a premixing kettle; 2, a first-stage swirler; 3, a secondary cyclone; 4, centrifuging and filtering the kettle;

5 an oxidant or extractant storage tank; 6, a buffer tank; 7, a slurry pump; 8 liquid delivery pump.

Detailed Description

Factors influencing the adsorption desulfurization efficiency are many, such as the type of the adsorbent, the pore structure and the surface composition of the adsorbent, the sulfur concentration in the oil product, the dosage of the adsorbent, the adsorption time, the adsorption temperature and the like; factors influencing the cyclone separation comprise cyclone structure, cyclone series mode, inlet flow velocity, split ratio, density difference of the adsorbent and oil, size distribution of adsorbent particles, temperature and the like; factors that affect the regeneration of the adsorbent include the type of oxidant (extractant), the amount of oxidant (extractant) added, the oxidation (extraction) time, the oxidation (extraction) temperature, and the like. The present invention will be described in detail below with reference to specific embodiments. The examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention. The method and the device for absorbing and removing the sulfide in the oil product and separating the adsorbent by cyclone have similar treatment methods and principles for different adsorbents and different oil products. Therefore, for the convenience of description, the specification mainly provides a brief description by taking the novel porous organic framework material HKUST-1 as an example for adsorbing and removing dibenzothiophene sulfur in oil products. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions.

Example 1 analysis of the Sulfur content

1 microliter of oil containing a certain amount of dibenzothiophene sulfur is added into a gas chromatograph, the detector is a Flame Photometric Detector (FPD), and the chromatographic column is a capillary column (HP-5,15m multiplied by 0.53mm multiplied by 1.5 mu m). The carrier gas is nitrogen, the column temperature is 200 ℃, the gasification temperature is 340 ℃, the FPD temperature is 340 ℃, the column pressure is 0.1MPa, the air flow is 50 ml/min, and the hydrogen flow is 40 ml/min. The desulfurization amount can be calculated by the formula (1):

wherein q is_tRepresents the amount of sulfur adsorbed by the adsorbent (unit: g S/kg adsorbent, gS/kg), V represents the model oil volume (mL, mL), M represents the mass of the adsorbent (g, g), M represents the mass of the adsorbent_WADenotes the molecular weight, M, of dibenzothiophene_WSDenotes the molecular weight of sulfur, and C₀And C_i(mgS/L ) represents the sulfide concentration in the model oil before and after adsorption, respectively.

Example 2 adsorption Performance of HKUST-1 on Dibenzothiophene

The HKUST-1 is synthesized in an autonomous scale mode and is used as an adsorbent. The main property parameters are as follows: the specific surface area is 1500m²g^-1Pore volume of 0.5cm³g^-1The average pore diameter is 1.2 nm; the average grain diameter is about 30 um; the skeleton density was about 2.10g cm^-3. The adsorbent HKUST-1 powder is placed in a 150-degree oven to be activated for 4 hours, and impurities and moisture adsorbed in pores of the adsorbent HKUST-1 powder are removed. Adding the activated HKUST-1 powder into a sealed container containing oil product, stirring, and mixing to obtain a mixture with oil product density of 0.75g cm^-3(ii) a The viscosity was 1.43 cp. After a certain time of adsorption at 25 ℃, the adsorbent HKUST-1 is centrifugally separated from the oil product, 1 microliter of the upper layer clear oil product is taken out, and the gas chromatography is injected, and a flame photometric detector is used for analyzing the sulfur content. The results are shown in Table 1, in which the adsorption rate is very high and the adsorption equilibrium is reached within 1 minute. The initial dibenzothiophene concentration (10ppm-500ppm) in the oil product is changed to obtain the change of the adsorption quantity with the equilibrium concentration, and the result is shown in Table 2, and the equilibrium saturation adsorption quantity of the HKUST-1 is calculated to be up to 33gS/kg adsorbent.

TABLE 1.25 degree adsorption vs. time

TABLE 2.25 degree adsorption as a function of equilibrium concentration

Example 3 determination of solid-liquid separation efficiency and optimum working area of single-stage cyclone system having cone angle of 8 degrees

The solid-liquid separation efficiency and the optimal working area of the cyclone system are determined by a clear water experiment, a simulated solid-liquid system with glass powder as a solid phase and water as a liquid phase is adopted, wherein the average density of the glass powder is about 2.3g cm^-1And an average particle size of about 35 microns.

And (3) correctly assembling each interface and valve of the single-stage cyclone separation system with the cone angle of 8 degrees, cleaning and emptying the system for many times before testing, and performing formal testing after confirming drying. The feed tank was filled with water in excess of 1/3 volumes to adjust the various valve nodes required for the operating conditions. And starting the slurry pump, adjusting the inlet pressure of a valve as an adjusting parameter, and keeping other working condition parameters (including temperature, flow splitting ratio and the like) stable.

Adding 2 percent, 4 percent and 8 percent of glass powder into a feed chute according to the mass fraction, uniformly mixing, and preheating the system until the material temperature is constant at 25 ℃. And starting the pump to operate, adjusting each valve according to the required working condition, and conveying the glass powder-water mixed liquid into the cyclone separation system by a slurry pump. And when the system runs stably, sampling is carried out through an inlet, an overflow port and a bottom flow port of the cyclone, and the solid content of the liquid mixture of each sample is analyzed respectively. Wherein, the solid content analysis adopts a gravimetric analysis method: the sample suspension was vacuum filtered through a Nylon (Nylon) disk filter (0.22 μm pore size). And (4) drying the collected solid sample, and calculating the solid content of the outlet under each working condition.

The control of the feeding concentration, the inlet flow and the split ratio of the cyclone system has obvious influence on the separation efficiency of the 8-degree single-stage cyclone. For low concentrations of solids, e.g. 2%, the inlet flow rate in the optimum working space is 0.8-1.0m³h^-1The split ratio is 8-12%, and the separation efficiency is 71.2%. The greater the concentration, the lower the separation efficiency.

Example 4 determination of solid-liquid separation efficiency and optimum working area of single-stage cyclone system with cone angle of 22 degrees

Separation efficiency and optimum operating region of a single stage cyclonic system with a cone angle of 22 degrees were examined in a similar manner to example 3. Adding 4 percent, 8 percent and 10 percent of glass beads into a feeding groove according to the mass fraction. Mixing evenly, and preheating the system until the material temperature is constant at 25 ℃. The pump is started to run, and the inlet, the overflow port and the underflow port of the cyclone are used for sampling. The influence of the regulation and control of the feeding concentration, the inlet flow and the flow dividing ratio of the cyclone system on the separation efficiency of the 22-degree single-stage cyclone is inspected, the solid content is 8 percent, and the flow in the optimal working interval is 0.5-0.6m³h^-1The separation efficiency is 65% with a split ratio of 12%. Low concentration, separationThe efficiency is greater, whereas the separation efficiency is reduced.

Example 5 measurement of solid-liquid separation efficiency of two-stage series cyclone System

The single cyclones are connected in series to form a two-stage cyclone separation system of a large-angle cone cyclone connected in series with a small-angle cone cyclone (for example, 22-8), or a small-angle cone cyclone connected in series with a large-angle cone cyclone (8-22). The liquid discharged from the overflow port of the first cyclone flows into the second cyclone for secondary separation, and the liquid obtained from the overflow port of the second cyclone is a separation product. And respectively sampling the overflow port and the underflow port of the two cyclones, and analyzing the solid content of the liquid mixture of each sample. Determining the efficient working interval of the 22-8 series mode cyclones as follows: flow rate of 0.8m³h^-1The first-stage split ratio is 12%, the second-stage split ratio is 12%, and the separation efficiency is 80%. The separation efficiency of 8-22 series cyclones is 75%.

Example 6 measurement of adsorption desulfurization efficiency of two-stage series cyclone System

And (3) correctly connecting each interface and valve of the secondary cyclone separation system in a 20-6 series connection mode, cleaning and emptying the system for many times before testing, and performing formal testing after confirming drying. Injecting an oil product containing 50ppm of sulfur into the feed tank, wherein the volume of the oil product exceeds 1/3; 5 w.t% of HKUST-1 adsorbent was added to the system using a 1:20 ratio of solvent to oil. Adjusting each valve node required by the working condition, starting a slurry pump, keeping the temperature constant, adjusting the inlet pressure, the flow and the split ratio, collecting materials at an underflow outlet and an overflow outlet, filtering, analyzing the solid content, and analyzing the sulfur content of an oil product by adopting the method of the embodiment 1.

When the flow rate is 0.8m³h^-1The first-stage split ratio is 12 percent, the second-stage split ratio is 8 percent, the separation rate of adsorbent particles exceeds 99.5 percent, and the sulfur content in the finally clarified oil product is less than 10 ppm.

EXAMPLE 7 adsorbent solvent extraction regeneration

Toluene is selected as a solvent, and the HKUST-1 adsorbent adsorbing sulfur is subjected to solvent extraction regeneration.

25 liters of toluene solvent was added to 5 kg of used adsorbent HKUST-1 powder, stirred well, and after about 10 minutes, filtered to obtain a solid powder. The extraction was repeated 3 times. And (3) putting the extracted solid powder into a vacuum oven at 150 ℃ for drying, and removing the solvent. And (3) carrying out adsorption desulfurization on the regenerated HKUST-1 again, and recycling for 20 times, wherein the adsorption performance is basically maintained unchanged.

Similarly, when the solvent is selected from dimethylbenzene and petroleum ether, the extraction effect is similar.

EXAMPLE 8 oxidative regeneration of adsorbent

Hydrogen peroxide is selected as an oxidant to oxidize dibenzothiophene sulfur absorbed in the HKUST-1 adsorbent to generate dibenzothiasulfone, and the sulfone is easily dissolved in water and is regenerated by the adsorbent after being washed by water.

5l of a 3% aqueous solution containing hydrogen peroxide were added to 5 kg of used adsorbent HKUST-1 powder, stirred well and, after about 10 minutes, washed with water. The washing was repeated 3 times. And putting the solid powder obtained after separation into a vacuum oven for drying at 150 ℃. And (3) carrying out adsorption desulfurization on the regenerated HKUST-1 again, and recycling for 20 times, wherein the adsorption performance is basically maintained unchanged.

And similarly, sodium hypochlorite is used as an oxidant, and can be oxidized and regenerated, and the effect is similar.

Claims

1. A system for removing sulfides in oil products by rotational flow reinforcement comprises the following steps:

step (1), adsorption desulfurization: the absorbent absorbs the sulfide in the oil product; adding the adsorbent and the oil product into a pre-mixing adsorption unit and a liquid-solid suspension conveying unit, and uniformly mixing, wherein the pre-mixing adsorption unit comprises a sealed kettle with a stirrer, and mixing and adsorbing are completed; the adsorbent is fully contacted with the sulfide in the oil product for adsorption; then the mixture is conveyed by a material pump to enter a rotational flow system; the selected adsorbent is Y-type molecular sieve, 13X molecular sieve, mesoporous molecular sieve, active carbon, metal organic framework material MOFs, porous organic polymers POPs or poly-porous ionic liquid PILs;

separating the adsorbent in the step (2): separating fine adsorbent particles by a cyclone method; oil containing the adsorbent enters a liquid-solid separation cyclone system unit, and operation parameters such as inlet flow, flow split ratio and the like are regulated and controlled, so that the adsorbent particles rotate and revolve in a micro-cyclone field, the adsorption desulfurization is further enhanced, and meanwhile, the liquid-solid separation of the adsorbent fine particles is realized; low-sulfur product oil is obtained at the overflow port, a mixture of the high-solid-content adsorbent and the oil product obtained at the underflow port is partially back-mixed and recycled, and a part of the mixture enters a regeneration system;

the liquid-solid separation cyclone system unit comprises a single-stage or two-stage series cyclone; wherein the first cyclone of the series system is provided with an inlet for receiving the outlet mixed liquid of the mixed adsorption unit, an overflow port for discharging the oil product after the first-stage separation, and a bottom flow port for discharging the adsorbent after the first-stage separation; the oil product discharged from the overflow port enters a second cyclone for secondary separation, and an inlet is arranged for receiving the oil product discharged from the overflow port of the first cyclone, an overflow port is arranged for discharging the oil product after the secondary separation, and a bottom flow port is arranged for discharging the adsorbent after the secondary separation; the sulfur content of the separated oil product is lower than 10 ppm;

and (3) regenerating the adsorbent: adding an oxidant into the adsorbent adsorbing the thiophene sulfur according to an oxidation desulfurization mechanism, oxidizing the thiophene sulfur into water-soluble sulfone, leaching with water, and dissolving and eluting the sulfone; or according to the extraction principle, dissolving and removing the adsorbed sulfur by adopting an organic solvent; drying to obtain a regenerated adsorbent, and adding the regenerated adsorbent into an adsorbent recovery and regeneration unit for recycling;

2. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein the adsorbent selected in step (1) has an adsorption saturation sulfur capacity of 15-40 g/kg.

3. The system for removing sulfides in oil by cyclone reinforcement as claimed in claim 1, wherein the adsorbent selected in step (1) has a specific surface area of 150- "1800 m2/g, a pore volume of 0.35-1.1cm3/g, a density of 1.5-2.5g/cm3, and an average particle size of greater than 30 μm.

4. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein said cyclone separation system in step (2) is a single-stage cyclone with a cone angle of 5 ° to 25 °.

5. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein the cyclone separation system in step (2) combines the cyclones in series in two stages, which are respectively performed in series by a small-angle cyclone series-large-angle cyclone, a large-angle cyclone series-small-angle cyclone and an angle cyclone.

6. The system for removing sulfides in oil through cyclone reinforcement in accordance with claim 1, wherein the concentration of the adsorbent particles fed in the adsorption cyclone separation process in the step (2) is 2% -10%, the inlet flow rate is 0.2-1.0m3/h, and the split ratio of the underflow port and the overflow port is 5% -12%.

7. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein the back-mixing and regeneration ratio of the mixture of the high-solid-content adsorbent and the oil obtained at the underflow port in step (2) is 1:3-1: 1.

8. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein said adsorption cyclone separation process of step (2) is parallel and parallel.

9. The system for removing sulfides in oil products by cyclone reinforcement as claimed in claim 1, wherein said adsorbent in step (3) is regenerated by oxidation with H₂O₂NaClO as an oxidizing agent, oxidation depending on the adsorption sulfur capacity (n mol/g)The dosage of the additive is (1-3) times of n mol/g of adsorbent.

10. The system for removing sulfides in oil through cyclone reinforcement as claimed in claim 1, wherein the adsorbent in step (3) is regenerated by extraction, and the extraction and washing are carried out with toluene, xylene and petroleum ether solvent, wherein the dosage of the extractant is 3-5L/kg of adsorbent, and the process is repeated three times.