700 results about "Coal Tar Pitches" patented technology

The invention relates to a coal tar pitch refining method, in particular to a method for refining pitch for coal tar pitch needle coke, impregnant and binding agent for manufacturing high-power and ultrahigh-power graphite electrodes and pitch for manufacturing coal tar pitch carbon fibers. The method is characterized in that the method comprises the following steps: diluting coal tar pitch and the liquid containing coal tar pitch with organic solvent at a weight ratio of the organic solvent to coal tar pitch and the liquid containing coal tar pitch of 1:(5 to 30), removing impurities in the pitch solution by the combination of separation by a centrifuge and filtering with an organic film, and distilling and recovering the solvent in the refined mixture solution to obtain the coal tar pitch free of quinoline insoluble materials. The method has the advantages of good continuity of the separation process and high efficiency, and the pitch contains no quinoline insoluble materials.

The invention provides a technology for preparing a needle coke raw material from coal-tar pitch. The technology comprises the following steps of 1, fully mixing asphalt and a solvent, and removing insoluble substances in the mixture by a physical separation method, wherein the solvent is a mixture of coal light oil and coal aromatic oil or is a mixture of BTX and coal aromatic oil; a mass ratio of the coal light oil or the BTX to the coal aromatic oil is in a range of (20: 80) to (95: 5); and a mass ratio of the solvent to the asphalt is in a range of 0.5 to 10, 2, feeding a clear liquor without the insoluble substances into a separator, and separating the light solvent from the clear liquor to obtain a heavy fraction having low QI, and 3, carrying out hydrotreatment on the heavy fraction in the presence of a hydrogenation catalyst at a temperature of 300 to 450 DEG C under the pressure of 5 to 20MPa. The needle coke raw material obtained by the technology has low sulfur content and a small expansion coefficient.

The invention discloses a novel process for eliminating quinoline insoluble substances in a coal tar medium temperature pitch. The invention comprises the following steps: using the coal tar pitch as raw material, mixing with a solvent according to a certain proportion, and continuous extracting and settling separation for the settling separation of the quinoline insoluble substances in the pitch to obtain a clarified liquid and sediments. The invention is characterized in that the coal tar pitch material uses the coal tar medium temperature pitch; the coal tar medium temperature pitch and a mixed solvent of an aromatic hydrocarbon solvent and an aliphatic hydrocarbon solvent according to a certain proportion are preheated and respectively sent to a multi-level static mixer for even mix according to a proportion of 1:0.8-1.2 by weight to produce a mixing oil; and the continuous extracting and settling separation is carried out for eliminating the quinoline insoluble substances in the coal tar medium temperature pitch. Since the technical proposal is used, the invention has low cost and high separation efficiency, and the refine pitch after clarifying fully satisfies the requirement of producing needle coke or as an impregnant pitch.

Provided is a method of producing isolated graphene sheets directly from a carbon/graphite precursor. The method comprises: (a) providing a mass of aromatic molecules wherein the aromatic molecules are selected from petroleum heavy oil or pitch, coal tar pitch, a polynuclear hydrocarbon, or a combination thereof; (b) heat treating this mass and using chemical or mechanical means to form graphene domains dispersed in a disordered matrix of carbon or hydrocarbon molecules, wherein the graphene domains are each composed of from 1 to 30 planes of hexagonal carbon atoms or fused aromatic rings having a length or width from 5 nm to 20 μm and an inter-graphene space between two planes of hexagonal carbon atoms or fused aromatic rings no less than 0.4 nm; and (c) separating and isolating the planes of hexagonal carbon atoms or fused aromatic rings to recover graphene sheets from the disordered matrix.

A graphite electrode for an electrothermic reduction furnace is formed from anode grade coke and graphitized at a graphitization temperature below 2700° C. The resulting electrode is particularly suited for carbothermal reduction of alumina. It has an iron content of about 0.05% by weight, a specific electrical resistivity of above 5 μOhm·m, and a thermal conductivity of less than 150 W/m·K. The graphite electrode is manufactured by first mixing calcined anode coke with a coal-tar pitch binder, and a green electrode is formed from the mixture at a temperature close to the softening point of the pitch binder. The green electrode is then baked to carbonize the pitch binder to solid coke. The resultant carbonized electrode, after further optional processing is then graphitized at a temperature below 2700° C. for a time sufficient to cause the carbon atoms in the carbonized electrode to organize into the crystalline structure of graphite.

The invention relates to a high-softening-point coal-tar pitch production method, which is mainly and technically characterized in that the method comprises the following steps of: (1) adding low-QI (Quality Index) purified coal-tar pitch into a stirring tank, continuously feeding air into the stirring tank, carrying out stirring in the process of feeding air, and carrying out air oxidation under the condition of 200-300 DEG C, wherein the oxidation time is 4-12 h; and (2) after the oxidation is completed, adding the pitch into a film evaporator, carrying out thin-film distillation on the pitch at a temperature of 300-350 DEG C and under a vacuum negative pressure of 0.05-0.099 Mpa, removing light components in the pitch, and carrying out distillation treatment on the obtained product for one to four hours so as to obtain high-softening-point coal-tar pitch. The method disclosed by the invention is reasonable in design; and the softening point of high-softening-point coal-tar pitch produced by taking the low-QI purified coal-tar pitch as raw materials reaches 270-290 DEG C, and the high-softening-point coal-tar pitch is low in impurity content, high in purity, simple in production process, energy-saving and environmental-friendly, and can be widely applied to the production of cathode materials jackets for lithium ion batteries and carbon fibers.

The invention relates to a preparation method for purifying pitch, which comprises the steps of completely removing quinoline insolubles (QI) through extracting coal tar pitch with mixed solvent to obtain the purified pitch without QI. The purified pitch produced by the method can meet the requirement of producing carbon fiber and needle coke. The method has simple process, convenient preparation, easy operation, environmental protection and no pollution.

The industrial producing process of coal series needle coke includes the following steps: stepped condensing the flash oil produced in vacuum flashing of coal tar pitch to obtain three, heavy, medium and light, fractions; polycondensating the medium fraction in an improved pitch circulating process to obtain condensed pitch; delay coking the condensed pitch and the heavy fraction and injecting N2 into the un-coked oil in the later coking stage to perform the final heating and coke drawing of the needle coke forming course; and final high temperature calcining to obtain coal series needle coke. Thus produced coal series needle coke has low thermal expansion coefficient and may be used in producing high power and super high power graphite electrode.

The invention relates to a battery cathode material, mainly relates to a lithium ion power battery composite cathode material and its preparation method, and belongs to the lithium battery making field. The lithium ion power battery composite cathode material is characterized in that the lithium ion power battery composite cathode material comprises a core-shell structure composed of a natural graphite matrix and a hard carbon layer coated on the surface of the natural graphite matrix, and a secondary modification layer for modifying the core-shell structure through adopting a modifying agent; the above coating is hard carbon formed through pyrolysis of a thermosetting resin; the thermosetting resin is at least one selected from a phenolic resin, an epoxy resin and a furan resin; and the modifying agent is at least one selected from coal tar pitch and petroleum asphalt. The lithium ion power battery composite cathode material having good electrochemical performances comprising capacity, first efficiency, cycle, rate and the like is prepared through adopting the primary coating and secondary modifying method.

The invention relates to a catalyst used for coal tar pitch hydrocracking lightening reaction. The preparation method of the catalyst comprises the following steps: taking an inorganic porous material as a carrier; selecting at least one of alumina, silica gel containing alumina, MCM-41 (mobile crystalline material-41) and SBA-15 (santa barbara amorphous-15); loading one or two of metal elements Fe, Ni, Co and Mo of active components onto the carrier in the form of metallic oxide or metallic sulphide by adopting a vacuum immersion method, wherein the metallic oxide or metallic sulphide content of the active components is 1-20wt% of the catalyst; then drying for 1-14 hours under the conditions that nitrogen is used for protection, normal pressure is kept and the temperature is 70-120 DEG C; and then roasting at the temperature of 500 DEG C for 3 hours. The catalyst in the invention has the advantages of simple preparation process, high catalytic activity, less reaction coking and high cracked light oil yield, thus being especially applicable to hydrocracking lightening of heavy component and pitch in coal tar, and the catalyst in the invention can cause conversion per pass of coal bar pitch to reach more than 70%.

The invention provides double-component epoxy resin anticorrosive paint and a preparation method thereof. Component A comprises the compositions by weight percentage of 15-25 percent of epoxy resin, 10-20 percent of modified petroleum resin, 30-40 percent of pigment, 2-5 percent of fillers, 5-6 percent of promoter and 10-20 percent of solvent. Component B comprises the compositions by weight percentage of 50-60 percent of polyamide curing agent, 10-20 percent of modified cashew oil curing agent and 30-40 percent of solvent. The viscosity of the component A is 3.0-8.0Pa.s. The weight ratio of component A to component B is 2-6 to 1. The paint contains no coal tar pitch. Damages to human bodies and the environment are greatly reduced. One-time thick membrane spraying construction can be implemented. And the paint has good chemicals resistance and corrosion resistance, can be used as paint for ballast water tank and accords with requirements of IMO convention. The process method has the advantages of convenience, simplicity, energy saving performance and low cost. Good membrane forming performance and good storing stability can be shown at room temperature.

The invention discloses long-acting metal anticorrosive paint used in metal member and equipment and preparing method, which is made by stirring and grinding coal tar pitch, organic polymolecularity resin, antirusting agent and auxiliary agent and then adding curing agent after adjusting viscosity. The metal anticorrosive paint possesses good weatherability and corrosion resistance, and can be used in metal member, metal member, building, underground engineering, ship and other preservative engineering.

The invention discloses a preparation method of isostatic pressing formed graphite. The preparation method comprises the following steps of: preliminarily grinding, grinding coal tar pitch and mixing the coal tar pitch powder with coke powder aggregate. According to the preparation method disclosed by the invention, the coke powder aggregate and the coal tar pitch powder are sufficiently mixed, so that the coal tar pitch powder is molten, sufficiently permeates into the air holes of the aggregate particle fine powder and can be uniformly coated on the surface of the particle fine powder during the next heating and kneading process, thereby achieving the purpose of homogenizing the material structure. The isostatic isotropic graphite material prepared by the preparation method disclosed by the invention is fine and compact in structure, good in uniformity, excellent in mechanics performance, wearable and isotropous.

The invention relates to a preparation method of an isostatic pressing microcrystalline graphite product. The isostatic pressing microcrystalline graphite product comprises the following components by weight: 35-50% of microcrystalline graphite, 10-25% of artificial graphite, 10-25% of electrically calcined pitch coke and 30-40% of modified coal tar pitch. The isostatic pressing microcrystalline graphite product is obtained by the steps of pretreating raw material, burdening, kneading, rolling, fragmenting and pulverizing, preforming, performing isostatic compaction, roasting, dipping, performing heat treatment under high temperature and the like. The unique part in the method is the usage of the natural microcrystalline graphite as a main aggregate, the resource can be used in a reasonable mode, high temperature graphitization heat treatment at more than 2500 DEG C on the product is not required, so that preparation period can be shortened, and the energy consumption is greatly reduced. The prepared isostatic pressing microcrystalline graphite has the advantages of high volume density, mechanical strength, low resistivity, fine and compact structure, and isotropy.

The invention provides a method for preparing mesocarbon microbeads by copolycondensation, which belongs to the technical field of deep processing of coal and is characterized by comprising the following process procedures of: mixing coal tar pitch with coal liquefaction residue pitch in proportion, further heating the mixture at 300-350 DEG C till a low velocity state is obtained, reacting at 390-450 DEG C under a pressure of 0.2-2MPa for 5-12h after stirring uniformly to generate pitch containing the mesocarbon microbeads, subsequently washing with light fraction of coal tar and an organic solvent to obtain the mesocarbon microbeads. According to the invention, the coal tar pitch and the coal liquefaction residue pitch are used as raw materials in copolycondensation reaction; the problems that a large quantity of nucleation promoter needs to be added in preparation of MCMB (mesocarbon microbeads) by using the coal liquefaction residue as the raw material, especially in industrial scale, and the addition of the large quantity of nucleation promoter results in homodisperse are solved; furthermore, no compatilizer needs to be added. The prepared MCMB is narrower in particle size distribution, the yield can reach 30% and the product has good sphericity.

The invention relates to a method for production of purified coal tar pitch from high temperature coal tar. The method includes: mixing the high temperature coal tar with a hydrogenation heavy solvent and deionized water, and then removing salt to obtain salt removed high temperature coal tar; mixing the salt removed high temperature coal tar with an aliphatic solvent, and then removing quinoline insolubles to obtain clarified oil; distilling the clarified oil to obtain the aliphatic solvent, phenol oil, naphthalene oil, purified coal tar pitch and mixed oil of light oil, washing oil, anthracene oil and the hydrogenation heavy solvent, and taking the mixed oil as catalytic hydrogenation feed oil; subjecting the catalytic hydrogenation feed oil to catalytic hydrofining to obtain hydrofined oil; distilling the hydrofined oil to obtain a naphtha component, a gasoline blending component, a diesel oil blending component and the hydrogenation heavy solvent. The method greatly enhances the added value of products processed from high temperature coal tar, and the purified asphalt has low content of quinoline insolubles and metals.

The invention relates to the field of carbon brush technology, in particular to a carbon brush used for a low-abrasion motor and mixed with nanocopper and a preparation method thereof. In the carbon brush, middle-temperature coal tar pitch, conductive silica gel and epoxy resin are mixed and used as a bonding agent. The composite bonding agent has higher comprehensive performance and electrical conducting performance, and is anti-abrasion and not liable to crack. Via the mixed nanocopper, oxidized grapheme and nanocarbon sol, electrical conductivity of materials is effectively improved, frictional coefficient is reduced, and flexibility of materials is improved. The prepared carbon brush has high electrical conducting performance, is low in abrasion rate, operates stably, generates low noise and small sparks, has stable size, and will not damage a rotator and a stator.

The invention belongs to the technical field of brown coal quality improving, and relates to a large-scale brown coal quality-improving process and a large-scale brown coal quality-improving apparatus. According to the invention, an interrelated large-scale continuous brown coal quality-improving system is composed of three modules which are a tunnel internal-heat drying module, an external-heating microwave destructive distillation module, and a powdery brown coal molding and drying module. Because of large-amount water discharging, a brown coal block large-capillary framework is collapsed, so that the brown coal is naturally broken into small blocks and powder without mechanical disruption. The small-block brown coal is subjected to destructive distillation under high-temperature hot wind external heating and microwave coupling, until the blocks turn into semi-coke; water-containing coal gas, water-containing coal tar, anhydrous gas, and anhydrous coal tar are respectively obtained by destructive distillation. With a binder of the water-containing coal tar and coal tar pitch (one or a mixture thereof), the powdery brown coal is subjected to kneading and aging; the material is processed into granules by using a vacuum extrusion granulator; and the particles are processed by using a low-temperature microwave drying device, so that high-quality brown coal particles with high strength, low moisture absorption, and high heat value are obtained. The brown coal particles can endure long-distance transportation.

Petroleum or coal tar pitch-based cellular or porous products having a density of preferably between about 0.1 g/cm3 and about 0.8 g/cm3 are produced by the controlled heating of mesophase carbon materials derived from coal tar or petroleum pitch having a softening point in excess of about 300° C. and preferably between about 300 and about 400° C. in a "mold" and under a non-oxidizing atmosphere. The porous product thereby produced, preferably as a net shape or near net shape, can be machined, adhered and otherwise fabricated to produce a wide variety of low cost, low density products.