103 results about "Dispersit" patented technology

The invention relates to the technical field of marine fuel oil additives, and particularly provides a marine fuel oil purification synergist and a preparation method thereof. The marine fuel oil purification synergist comprises the following components in percentage by mass: 8%-12% of a sulfur capturing agent, 15%-20% of a core-shell dispersing agent, 5%-8% of a lubricating agent, 0.5%-1% of an antioxidant, 1%-2% of a pour point depressant and the balance of a solvent. The marine fuel oil purification synergist has the advantages of high flash point, sulfur inhibition, combustion enhancement and dispersion stability. The multi-component synergistic system not only greatly improves the combustion efficiency of the marine fuel oil, but also effectively inhibits the emission of harmful substances, obviously reduces the carbon deposition and wear of an engine, and keeps the cleanliness of a fuel oil system. In practical application, the synergist shows excellent environment-friendly benefits and economic benefits, and a green fuel solution which can meet increasingly strict requirements of environment-friendly laws and regulations and can reduce the operation cost is provided for the ship industry.

This invention relates to the field of special agents for treating air pollution, specifically to a rare earth water-based environmentally friendly urea crystal remover for vehicles and its preparation method. The raw materials for preparing the rare earth water-based environmentally friendly urea crystal remover for vehicles, by weight, include: 0.005-0.2 parts rare earth-based catalyst, 3-10 parts surfactant, 1-3 parts dispersant, 5-10 parts stabilizer, and 80-100 parts deionized water; wherein the rare earth-based catalyst includes at least a cerium-based catalyst. The urea crystal remover provided by this invention has excellent performance, effectively removing urea crystals, and the cerium emission concentration is far below the requirements of the EURO 7 draft (EURO 7 does not require cerium). NOx conversion rate is significantly improved, making it more suitable for vehicles using high-sulfur fuels, and greatly benefiting the control of air pollution from mobile sources. It is also environmentally safe and environmentally friendly.

The invention belongs to the technical field of data center cooling, and discloses a narrow fraction mineral base oil single-phase immersed cooling liquid and a preparation method thereof in order to solve the problem of poor stability of the cooling liquid, and the preparation method comprises the following steps: preparing a dispersant; the preparation method comprises the following steps: adding an antioxidant and nano heat-conducting particles into narrow fraction mineral base oil, and stirring to obtain a product a; heating narrow fraction mineral base oil, adding a dispersing agent and an anti-rust agent, and stirring to obtain a product b; and finally mixing and stirring the product a and the product b. The cooling liquid provided by the invention takes the narrow fraction mineral base oil as a matrix, solves the problems of poor heat dissipation, weak oxidation resistance and low flash point of the traditional mineral oil through the synergistic effect of all the components, has low viscosity, high flash point, excellent electrical insulation and thermal conductivity, good compatibility and low volatilization rate, is suitable for immersed cooling systems such as a large computing power data center, and has wide application prospects. The high-efficiency heat dissipation and safe operation requirements of high-heat-density equipment can be met, the preparation process is simple, the cost is low, and the industrial application value is good.

The invention relates to the field of sealing materials, in particular to a heat-resistant and oil-resistant sealing gasket for an engine and a preparation method of the heat-resistant and oil-resistant sealing gasket. The liquid silicone rubber is prepared from the following raw materials in percentage by weight: 60-80% of a liquid silicone rubber base material, 15-28% of an oil-resistant heat-resistant base material, 0.1-3% of a cross-linking agent, 0.1-0.6% of a catalyst and the balance of a processing aid, the oil-resistant and heat-resistant base material is prepared from an inorganic filler, aramid pulp, polyhedral oligomeric silsesquioxane-alcoholic hydroxyl group, an activation dispersant and a double-active-group-epoxy silane coupling agent; the activation dispersant is a trihydroxymethyl caprolactone cross-linked polymer and / or bis (pinacol) borate; and the inorganic filler is composed of a plurality of components selected from fumed silica powder, nano-scale ceramic powder and zinc borate nano-powder. The oil-resistant and heat-resistant base material obtained by the scheme interacts with the silicone rubber base material, so that the prepared heat-resistant and oil-resistant sealing gasket for the engine has better comprehensive performance.

The invention discloses a plugging material as well as a preparation method and a use method thereof, and relates to the technical field of plugging of a petroleum engineering technology. Comprising the following components: 3%-5% of starch, 2%-6% of vegetable gum, 16%-25% of a polymeric monomer compound, 5%-8% of a pH regulator, 0.05%-0.1% of a curing agent, 4%-12% of a gelation reagent, 3.2%-9.6% of a gelation auxiliary agent, 1%-4% of a dispersing agent, 0.05%-1% of an initiator, 3%-5% of a capsule gel breaker and the balance of water. The plugging material has good pumping performance on the ground, has certain viscosity, can be kept in a slug flow state in the pumping process, avoids leakage or formation of a half-section slug during waiting for cementing (gelling and curing), can realize rapid plugging after chemical reaction gelling at the bottom of a well, and has the advantages of high plugging efficiency and high plugging efficiency. And after the subsequent operation is completed, the plugging agent can be degraded and dissolved under the combined action of the formation temperature and the capsule gel breaker, so that the plugging purpose is achieved.

The invention belongs to the technical field of heat-conducting silica gel gaskets, and particularly relates to a rebounding heat-conducting silica gel gasket and a preparation method thereof.The rebounding heat-conducting silica gel gasket is prepared from, by weight, 100 parts of vinyl silicone oil; 600 to 1000 parts of a treated heat-conducting filler with a large particle size; 100 to 300 parts of small particle size spherical alumina; 10 to 30 parts of graphene slurry; 5-10 parts of hydrogen-containing silicone oil; and 0.2 to 0.5 part of a catalyst. A high-efficiency heat-conducting network is constructed through graphene, and a combination of a mixture of large-particle-size spherical aluminum nitride and spherical aluminum oxide and small-particle-size spherical aluminum oxide is combined; meanwhile, the gasket is endowed with excellent resilience through a chelating dispersant enhanced cross-linked network, surface elastic coating treatment of the large-particle-size heat-conducting filler and a synergistic effect of graphene, and excellent balance of high heat conductivity and high resilience is realized.

The invention discloses a novel mixed water-based fuel and a processing method thereof, and belongs to the technical field of fuel preparation. The novel mixed water-based fuel is prepared from the following components in percentage by weight: 30% of water, 25% of heavy aromatics, 20% of base oil, 10% of a catalyst, 10% of a dispersing agent, 3% of an environment-friendly detergent and 2% of a combustion improver. The processing method comprises the following steps: putting the purified water into a stirring container, sequentially adding the heavy aromatics, the base oil and the catalyst, and uniformly stirring; heating to 40 + / -5 DEG C, adding a dispersing agent, and stirring; and cooling, adding the combustion improver and the environment-friendly detergent, and uniformly stirring. The formula is scientific and reasonable, the synergistic effect of all the components is remarkable, and the prepared fuel system is stable, full in combustion, low in pollutant emission and outstanding in energy-saving and environment-friendly effect; the processing method is simple and easy to implement, controllable in operation and high in safety, production conditions are easy to realize, dual requirements of laboratory preparation and large-scale industrial production can be met, and the method has a good application prospect.

The application discloses a solid waste-based self-compacting super-waterproof backfill material and a preparation method thereof, and the solid waste-based self-compacting super-waterproof backfill material is formed by mixing and stirring slag and a solid waste-based high-impervious curing agent and water; the solid waste-based high-impervious curing agent comprises steel slag powder, granulated blast furnace slag, fly ash, red mud, industrial by-product gypsum, hydrophobic organic acid salt, alkali metal lactate, high-performance polycarboxylate water reducer and dispersant. Physical-chemical reactions occur in the mixing and stirring, a large amount of cementing bodies are generated in the curing process, the inter-particle pores of soil are filled, the structure is compacted, the strength is high, and the imperviousness is good; the application focuses on the solid waste resource utilization demand, has the advantages of high solid waste utilization rate, low economic cost, high fluidity, good waterproof performance and the like; and the application changes the need of adding cement clinker in traditional backfill materials, and is more economical and environment-friendly.

The present invention belongs to the field of metal surface treatment and relates to a composite boronizing agent and a solid boronizing method for oil pipes. The composite boronizing agent comprises a boronizing agent and graphite. Calculated on the basis of mass percentage, the graphite is 10-14% of the mass of the boronizing agent. The boronizing agent comprises the following raw materials in mass percentages: boron source: 10-15%, catalyst: 12-20%, activator: 8-10%, dispersant: 4-6%, filler: 50-55%, and flow aid: 8-12%, and the dispersant is triethanolamine borate. In the composite boronizing agent of the present invention, the triethanolamine borate can remove impurities from an inner surface of an oil pipe, improve the boronizing effect and boronized layer quality, and form a protective film to prevent carburization, promote boronizing, and enhance boronized layer bonding strength. In addition, through the combined action of triethanolamine borate and graphite, the boronizing agent can be prevented from agglomerating or adhering to the inner surface of the oil pipe after boronizing treatment, and the uniformity of boronizing can further be improved.

The invention discloses carboxyalkylated lignin as well as a preparation method and application thereof in coal gasification wastewater coal slurry, and belongs to the technical field of coal water slurry. The carboxyalkylated lignin with a three-dimensional structure is obtained by introducing a carboxyalkyl branched chain into a lignin structure through a graft copolymerization method. The preparation method comprises the following steps: dissolving lignin in deionized water or isopropanol, adjusting the pH value to 11-12, adding a reaction reagent with a carboxyl functional group and an alkyl chain, and reacting in a water bath at 60-80 DEG C for 2-4 hours; then adjusting the pH value to 6-7; and washing, centrifuging and purifying to obtain the carboxyalkylated lignin. Carboxyalkylated lignin is used as a dispersing agent to be applied to a system for preparing coal water slurry from coal gasification wastewater, coal particles can be fully dispersed and stabilized in a complex coal gasification wastewater system by using fewer adsorption sites, and the carboxyalkylated lignin can be used as the dispersing agent to remarkably improve the slurrying performance and long-term stability of coal gasification wastewater coal slurry.

The invention relates to the field of engine oil, in particular to long-life high-efficiency dynamic equilibrium air compressor oil and a preparation method thereof. The invention relates to long-life high-efficiency dynamic equilibrium air compressor oil, which is prepared from the following raw materials in parts by mass: 90 to 120 parts of base oil system, 1 to 2 parts of antioxidant, 2 to 6 parts of extreme pressure anti-wear agent, 0.3 to 0.6 part of metal deactivator, 0.5 to 1.5 parts of anti-rusting agent, 0.2 to 0.3 part of defoaming agent, 0.5 to 1.2 parts of purification dispersant and 3 to 8 parts of functional auxiliary agent. The finally prepared air compressor oil not only has the effects of long service life, high energy efficiency and the like, but also can keep comprehensive properties such as oxidation resistance, detergency and anti-foaming property at the same time so as to meet the increasing application requirements of air compressors.

The invention discloses a fifth-generation gasoline detergent and a preparation method and application thereof.The detergent is prepared from, by mass, 5.1%-16% of azole polynitrogen compounds with the carbon atom number being 6-12 and the nitrogen atom number being 3-6, 40.1%-48% of Mannich base detergent dispersants with the number containing C8-14, 5.1%-12% of organic acid R6-12 hydrazine catalytic auxiliaries, 1.4%-3% of antioxidants and 30%-49.5% of C8-12 straight-chain alkane. The preparation method comprises the following steps: mixing the components according to the proportion, and filtering through a 1-1.5 mu m filter screen. The additive amount of the cleaning agent is 200-220 mL / m < 3 >, sufficient combustion of gasoline can be promoted, the emission amounts of CO, HC and NOx in tail gas are reduced by 30%, 33% and 19% respectively, the fuel saving rate reaches 10.24-14.01%, the power of an engine can be improved, and an automobile is assisted to meet the strict emission standard.

The invention discloses a tin-zinc-copper powder ultrafine powder batch preparation process, and relates to the technical field of metal powder preparation, and the tin-zinc-copper powder ultrafine powder batch preparation process comprises the following steps: dissolving tin salt, zinc salt and copper salt in deionized water, adding a complexing agent, and uniformly mixing to obtain a mixed metal salt aqueous solution; dissolving a rosin-based polyamine hyperbranched dispersant in an organic solvent to serve as an oil phase; slowly adding a mixed metal salt aqueous solution into the oil phase, and uniformly dispersing to obtain a water-in-oil microemulsion system; dropwise adding a reducing agent solution, and continuously carrying out heat preservation reaction for 0.5-3 hours after dropwise adding is finished, so as to obtain slurry containing alloy particles; and carrying out demulsification treatment, centrifugal separation, repeated washing and drying to obtain the surface-modified tin-zinc-copper superfine powder. Superfining of particles is achieved through confinement growth, synchronous co-deposition of multi-component elements is guaranteed, a homogeneous alloy phase is formed, component segregation is avoided, and a protective layer formed on the surface of the powder in situ endows the material with excellent oxidation resistance and good weld-aid wettability.

The invention discloses a preparation method of modified hydrotalcite lubricating oil with high dispersion performance, and relates to the technical field of lubricating oil, the method comprises the following steps: dropwise adding an alkali solution into a salt solution to obtain a suspension; aging and separating the suspension to obtain a reaction product; the reaction product is washed, dried, ground and sieved, and the ZnMgAl LDH nanosheet is obtained; the preparation method comprises the following steps: modifying a ZnMgAl LDH nanosheet to obtain modified hydrotalcite; and adding the modified hydrotalcite into the base oil to prepare the modified hydrotalcite lubricating oil. The calcium-magnesium-aluminum hydrotalcite is subjected to surface modification through the dispersing agent, on one hand, the compatibility of the hydrotalcite and the lubricating oil base oil is enhanced through the long-chain alkane structure of oleic acid, and the dispersion problem caused by hydrophilicity of the hydrotalcite is solved; on the other hand, by means of a hexagonal layered crystal structure of hydrotalcite, a low-shear-force lubricating film is formed on a friction interface, so that the lubricating performance of the lubricating oil is synergistically improved; in addition, the modified hydrotalcite has good thermal stability at the temperature of about 230 DEG C or below, and is suitable for high-temperature use scenes of the lubricating oil.

To provide a dispersant capable of enhancing dispersibility of a carbonate-blended cement composition.SOLUTION: The present invention provides a dispersant for carbonate-blended cement compositions, such as calcium carbonate, comprising a polycarboxylic acid copolymer containing 1 to 99 wt.% of a composition unit (I) derived from a monomer represented by a general formula (1) and 1 to 99 wt.% of a composition unit (II) derived from a monomer represented by a general formula (2). It is preferable that an average particle size of the carbonate be 1.0 to 100 μm. It is preferable that a weight average molecular weight of the polycarboxylic acid copolymer be 5,000 to 100,000.SELECTED DRAWING: None

The invention discloses a solid-waste-based green nano-composite seed crystal early strength agent and a preparation method thereof, and relates to a green and environment-friendly seed crystal early strength agent. The solid-waste-based green nano composite seed crystal early strength agent is prepared from the following raw materials in parts by weight: 200 to 300 parts of deionized water, 100 to 150 parts of dispersing agent, 200 to 300 parts of Ca (NO3) 2 solution, 100 to 200 parts of Na2CO3 solution, 50 to 100 parts of steel slag powder and 50 to 140 parts of waste concrete recycled micro powder. The solid-waste-based green nano-composite seed crystal early strength agent disclosed by the invention takes the steel slag powder and the waste concrete recycled micro powder as raw materials, is low in cost, reduces the pollution of solid wastes to the environment, is green and environment-friendly, and is simple in process.

The utility model provides a marine spilled oil chemical dispersion device, which comprises a double-shaft motor, the output end of the double-shaft motor is respectively and fixedly connected with a turntable and a stirring paddle, the upper surface of a rotating shaft is fixedly connected with a cam block, during separation, the double-shaft motor can be turned on and simultaneously drives the output shafts at the upper end and the lower end to rotate, and the cam block is fixedly connected with the rotating shaft. In the rotating process, the rotating disc and the stirring paddle are driven to rotate at the same time, the stirring paddle drives the dispersing agent to be mixed with spilled oil in the sea in the rotating process, the dispersing agent is promoted to make better contact with the spilled oil, emulsification and dispersion of the spilled oil are accelerated, micro-particles are formed, and finally the micro-particles enter the sea to be biodegraded and purified by a water body. The rotation of the turntable drives the cam block to abut against and separate from the connecting rod, so that the cover plate moves up and down, the feeding channel is opened and closed, and the dispersing agent is fed in real time.

The present application relates to the field of oil and gas well cementing engineering, and particularly relates to an oil-based drilling debris cementing slurry system, a preparation method and application thereof. The oil-based drilling debris cementing slurry system includes, in terms of weight parts, cement 100 parts, oil-containing drilling debris 25-45 parts, anti-pollution agent 0.5-5 parts, density adjusting agent 0-40 parts, expansion agent 0-5 parts, early strength agent 0-5 parts, dispersing agent 0-3 parts, suspending agent 0-3 parts, fluid loss reducer 1-10 parts, and water 50-70 parts. The oil-containing drilling debris is selected from oil-extracted drilling debris with a particle size of 0.3-20 microns, and more than 90% of the particles have a particle size of less than or equal to 9.44 microns. The oil-based drilling debris cementing slurry system provided by the present application can adjust the density of the oil-based drilling debris cementing slurry system, prolong the thickening time and increase the compressive strength, thereby ensuring the long-term integrity of the cement sheath. Meanwhile, the problem of oil-containing drilling debris waste treatment is solved, and the waste oil-containing drilling debris is reused.

The treated articles include fibers, sizing agents, and retention aids. The sizing agents include waxes or components thereof having an acid number of 10 mg to 220 mg KOH / g as measured in accordance with USP 401. The retention aids include nitrogen-containing polymers independently selected from the group consisting of (i) a nitrogen-containing polymer of Formula I, (ii) polyethyleneimine, (iii) a polyaminoamide, (iv) a copolymer formed from the reaction product of epichlorohydrin and dimethylamine, and (v) combinations thereof.

The invention relates to the technical field of petrochemical engineering, and particularly discloses an asphalt inhibitor and a preparation method and application thereof.According to the asphalt inhibitor, strong pi-pi conjugate interaction can be generated between aromatic rings in molecules and asphaltene aromatic lamellas, so that the molecules of a dispersing agent can be like an'anchor '; the particles are firmly adsorbed on the surfaces of asphaltene particles; a long alkyl chain of octadecyl methacrylate is a strong hydrophobic group and can be further inserted into a hydrophobic region of asphaltene through strong hydrophobic interaction, so that the asphalt inhibitor can be firmly adsorbed on the surface of the asphaltene and is not easy to desorb; a polyethylene glycol chain of polyethylene glycol methacrylate is a polar flexible long chain, after the dispersing agent is anchored on the surface of asphaltene, the flexible long chain can fully extend into a surrounding oil phase medium, asphaltene particles are effectively prevented from approaching through a steric hindrance effect, the dispersity of asphaltene is improved, and the dispersion of asphaltene is improved. The purpose of reducing the viscosity of the high-condensation-point thick oil is achieved.

The invention discloses an alcohol-soluble demulsifier and a preparation method thereof. The demulsifier is composed of a polyether polymer, an organic dispersant, a stabilizer, an auxiliary flocculant, an alcohol solvent, a surfactant and deionized water, and has excellent oil-water separation performance and storage stability. All the components are fully mixed through stirring and ultrasonic-assisted dispersion to form a uniform transparent liquid; experiments show that the stabilizer significantly prolongs the storage period of the agent, and the auxiliary flocculant effectively shortens the oil-water separation time, reduces the effluent turbidity and improves the oil sludge sedimentation rate; when the optimal formula is applied to marine oily sludge wastewater treatment, the oil-water separation time can be shortened to about 12 minutes, the effluent turbidity is lower than 50 NTU, the separated oily sludge can be directly recycled, the water is clear and transparent, and the discharge or cyclic utilization standard is met; the preparation process is simple, environment-friendly, efficient and suitable for the field of industrial wastewater treatment.

The invention belongs to the technical field of coatings, and discloses an oily matte silica gel hand feeling coating and a preparation method thereof.The coating is composed of a component A, a component B and a diluent, the component A is prepared from the following raw materials in parts by weight: 40 to 50 parts of polysiloxane, 5 to 6 parts of a curing agent, 0.1 to 0.2 part of a dispersing agent, 0.1 to 0.2 part of a silane coupling agent, 30.3 to 46.7 parts of heptane, 3 to 5 parts of a matting agent, 5 to 8 parts of particle powder and 0.1 to 0.3 part of an inhibitor; the component B is prepared from the following raw materials in parts by weight: 30-35 parts of a platinum catalyst and 65-70 parts of analytically pure ethyl acetate; the diluent is prepared from the following raw materials in parts by weight: 20 to 30 parts of heptane and 70 to 80 parts of n-butane. According to the invention, the raw materials are combined according to a proper ratio, the particle powder adopts spherical silicon dioxide ATA-60 and has the characteristics of good transparency and high hardness, and the appearance, hand feeling and weather resistance of a paint film can be considered by adding a proper amount of particle powder.

This invention discloses an oil-based phase change microcapsule suspension, comprising: base oil, dispersant, antioxidant, and phase change microcapsules. The phase change microcapsules are controlled at a preset particle size and uniformly dispersed in the base oil. Each phase change microcapsule includes at least a phase change core material and a wall material, with the wall material coating the phase change core material. The phase change core material is a material that undergoes a solid-liquid phase change at a preset critical temperature. The wall material can exchange heat with the phase change core material and also with the base oil. This invention can improve the heat exchange performance of immersed liquid cooling fluids.

The invention relates to the technical field of water-based radiation refrigeration coatings, and discloses a water-based radiation refrigeration coating composition and a preparation process thereof, the water-based radiation refrigeration coating composition comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 10 to 15 parts of a water-based substrate, 8 to 12 parts of a multi-effect cosolvent, 55 to 65 parts of radiation refrigeration functional filler, 10 to 20 parts of emulsion, 0.1 to 0.8 part of a hydrophobic auxiliary agent, 0.1 to 0.8 part of a wetting agent and 0.3 to 1 part of a thickening agent, and the multi-effect cosolvent is prepared from a dispersing agent, a defoaming agent and a first solvent; and the component B comprises the following raw materials in parts by weight: 65-75 parts of a curing agent and 25-35 parts of a second solvent. The water-based radiation refrigeration coating composition has good cooling performance, weather resistance and protection performance.

The application discloses a high-temperature release agent and a preparation method thereof, and relates to the field of metal forming auxiliary materials. The release agent is composed of pure water, nano aluminum sol powder, boron nitride powder, zirconium oxide powder, water-soluble silicone oil and special additives (dispersants, wetting agents and suspending agents) and is prepared through a specific process. The release agent has a Brookfield viscosity of 900-1100 cps, a pH of 2-5, and a total proportion of boron nitride and zirconium oxide of greater than or equal to 82% after combustion, and the boron nitride and the zirconium oxide are nano-level superfine powder. The release agent is stable at a high temperature of 1300 DEG C or above, does not produce toxic by-products, is easy to wash with water, is suitable for full atmosphere, solves the problem of metal high-temperature forming demolding, improves production efficiency and quality, has environmental protection and economic value, and is suitable for forming of complex metal parts such as engine pistons.

The application discloses a kind of low temperature heat conducting oil based on ionic liquid and preparation method, including: ionic liquid eutectic component 90-98 parts by weight, cleaning dispersant 2-10 parts;Ionic liquid eutectic component is the eutectic of binary or multi-ion liquid mixture.Formed.The application has higher safety, product toxicity is small, can obtain raw material is wide, low in price;Prepared heat conducting oil thermal stability is good, freezing temperature can be as low as-100 DEG C, low temperature viscosity is small, vapor pressure is extremely low, thermal efficiency is high, and cold quantity transmission efficiency is excellent, and low temperature performance is excellent.In addition to the above performance advantages, it also has the advantages of more than 10 years of service life, not easy to coke, and can reduce pollutant emissions, energy saving and environmental protection, widely used, can also be used as ultra-low temperature electrolyte and other low temperature working fluid, etc..

The invention relates to the field of scale inhibitors, in particular to an oil slurry scale inhibitor for a catalytic cracking unit and a production process of the oil slurry scale inhibitor, which are used for solving the problems that the existing scale inhibitor is poor in scale inhibition effect and poor in high-temperature stability, and is often difficult to meet the prevention and control requirements of the oil slurry scaling problem in a high-temperature environment. The dispersing agent in the oil slurry scale inhibitor adsorbs insoluble solid particles in oil slurry to prevent the insoluble solid particles from gathering and precipitating, efficient operation of a catalytic cracking device is guaranteed, the anti-aging agent can resist free radicals generated by the oil slurry under high-temperature and oxidation conditions, the aging process of the oil slurry is slowed down, the service life of equipment is prolonged, and the oil slurry scale inhibitor is suitable for industrial production. The polycarboxylic sulfonic acid pyridine compound can form a stable chelate with inorganic salt ions in the oil slurry due to a plurality of carboxylic acid groups and sulfonic acid groups, the oil slurry scaling is effectively inhibited, the organic phosphorus silicon compound has good thermal stability under a high temperature condition, and the effect of the oil slurry scale inhibitor under an extreme working condition is enhanced.

The present application belongs to the technical field of coal chemical industry, and relates to a method for preparing needle coke by adopting a two-stage extraction process, comprising the following steps: 1) cutting the washing oil of a 230-300 DEG C fraction section and the coal tar pitch component of a >350 DEG C fraction section of a medium-low temperature coal tar by a conventional pressure reduction cutting; 2) obtaining hydrogenated tail oil by hydrogenating the medium-low temperature coal tar; and then cutting to obtain fraction oil of 230-350 DEG C; 3) two-stage extraction refining, compounding the product after the first-stage extraction of the coal tar pitch component with the fraction oil, and then performing the second-stage extraction by using the washing oil to obtain refined pitch, and cutting to obtain a >300 DEG C fraction section; and 4) thermal nucleation of the >300 DEG C fraction section and a naphthalene-based interfacial dispersant, and then performing a two-stage temperature and pressure process, calcining and cooling to obtain needle coke. By the two-stage extraction and compounding, the present application can fully remove heteroatoms and improve the efficiency of the refined pitch; and the large-basin mesophase pitch with high anisotropy content is obtained, and the needle coke with high fiber structure content is prepared.