35 results about "Coal tar preparation" patented technology

The invention discloses a method for preparing diesel oil from coal tar. In the method, the coal tar and a catalyst are added into a reactor; after the reactor is closed, the temperature of the reactor is heated to 320-400 DEG C and the temperature is maintained for 0 to 20 minutes; after the temperature is reduced to the room temperature, a reactor product is taken out from the reactor; then distilling and separating are carried out; the cut fraction of 80 to 280 DEG C is taken out, thus obtaining the diesel oil. The method provided by the invention has the advantages of simple technique, low requirements to devices and high conversion rate. The invention belongs to the field of preparing diesel oil from coal tar.

The invention relates to a system and method for preparing coal tar, gas and semi-coke by activating coal gas and flash pyrolysing coal with a solid heat carrier. The system comprises a raw coal primary processing apparatus, a pyrolytic reaction separator, a semi-coke heating separator, a recycling apparatus, a coak tar recovering apparatus and a semi-coke cooling apparatus; a part of semi-coke powder discharged from the pyrolytic reaction separator enters the semi-coke heating separator, high-temperature smoke discharged from the semi-coke heating separator enters the recycling apparatus, the coal tar recovering apparatus produces coal tar and coal gas, and the semi-coke cooling apparatus produces semi-coke. In the existing coal tar preparation method, the coal pyrolytic optimization of the coal is not good, so that the existing coat tar preparation method has the technical problems of low oil yield, high investment and high energy consumption. The system for preparing the coal tar, gas and semi-coke by activating the coal gas and flash pyrolysing the coal with the solid heat carrier is rapid in pyrolysis, rapid in output and rapid in cooling.

The invention provides a method for manufacturing ultrahigh-modulus graphite fiber continuous filament from coal tar, belonging to a manufacture method of a graphite fiber. The method comprises the following steps of: extracting coal tar step by step with an organic solvent to obtain a pure pitch component; polymerizing the pure pitch component at a high temperature and high pressure to obtain a mesophase pitch with a moderate softening point, mesophase content not less than 98% and excellent spinnability; and performing fusion and continuous spinning on the mesophase pitch, and performing continuous oxidation, carbonization and graphitizing treatment to obtain the ultrahigh-modulus graphite fiber continuous filament with modulus not less than 600GPa. According to the method, the raw materials are readily available, the cost is low, the process is simple, the energy consumption is low, and the industrialization is facilitated.

The invention belongs to the technical field of preparation of needle coke and specifically relates to a process for preparing needle coke by utilizing coal tar. The process comprises the following steps: 1, a mixing and settling unit, mixing the coal tar and the fraction lower than 210 DEG C, and performing heating, standing and settling; 2, a filtering unit, pressurizing and filtering the supernatant liquid so as to obtain filtrate; 3, a fractionation unit, fractionating the filtrate in a fractionating tower to obtain four fractions; 4, a hydrocracking unit, performing hydrocracking on the fraction of 210-230 DEG C to obtain hydrocracked fraction; 5, a 1# pressurized polycondensation unit, reacting the fraction of 230-300 DEG C in a 1# pressurized polycondensation device to obtain 1# polycondensate; 6, a 2# pressurized polycondensation unit, carrying out a reaction of the fraction of higher than 300 DEG C in a 2# pressurized polycondensation device to obtain 2# polycondensate; 7, a coking unit, coking the 1# polycondensate and 2# polycondensate to obtain green needle coke; 8, a calcination unit, performing high-temperature calcination on the green needle coke, thereby obtaining the finished needle coke. Therefore, comprehensive utilization of the coal tar is realized.

The invention discloses a device and a process for preparing phenolic resin from coal tar. The process includes: taking methyl benzene or benzene as a solvent, taking acid or alkaline as a catalyst, subjecting the coal tar or distillation fractions thereof to phenolic polymerization reaction with formaldehyde, benzaldehyde, paraformaldehyde and furfural under certain conditions, filtering reaction products through a closed rotary drum vacuum filter to obtain the phenolic resin as well as solvent-containing dephenolized coal tar, rectifying the solvent-containing dephenolized coal tar to realize separation of water and the solvent, and recover the solvent to realize solvent recycling. Cheap medium-and low-temperature coal tar high in phenol content is adopted for phenolic polymerization reaction with aldehydes to prepare the phenolic resin, and phenolic substances in the medium-and low-temperature coal tar can be completely removed by further reaction. Therefore, phenol removal steps are simple, solvent recycling is realized, economy and environment friendliness are achieved, and a novel coal tar processing method simple in process, low in production operation cost, remarkable in economic benefit and easy for industrialization is provided.

The invention relates to a method for preparing active carbon by the use of semicoke and coal tar and the active carbon obtained by the method. The method of the invention comprises the following steps: (1) pretreatment: crushing semicoke until D95 of particles is less than or equal to 0.15 mm; (2) moulding: uniformly mixing the particles obtained in the step (1) and medium and low temperature coal tar and water, and carrying out extrusion moulding on the mixture to obtain an active carbon precursor, wherein weight ratio of the particles to the medium and low temperature coal tar is within therange of 1.5-3.0:1; and (3) charing: carrying out air pre-oxidation on the active carbon precursor at the temperature of 150-200 DEG C, charing at 780-920 DEG C, and cooling to obtain the active carbon. The method of the invention has the following characteristics: production technology is simplified; production efficiency is raised; production cost is reduced; and the prepared active carbon hasvery good mechanical strength and adsorptive property.

The invention relates to a method for preparing clean fuel oil from coal tar, belonging to the field of coal tar reprocessing. The method comprises the following steps: mixing coal tar and a specific solvent, holding the mixture in a high-pressure autoclave at constant temperature for several hours, cooling to room temperature, separating the reaction liquid, and extracting to obtain the fuel oil. In the coal tar supercritical extraction process, the solvent has the functions of both extraction and hydrogenation, and the coal tar is lightened under the condition of no need of high-temperaturehigh-pressure catalyst, thereby saving abundant energy sources and hydrogen resources.

The invention relates to a method for producing naphthenic base refrigerating machine oil base oil by using coal tar oil. The method comprises the following steps of: (1) carrying out first-stage hydrofining on the coal tar oil; (2) carrying out fractional distillation on a first-stage hydrofining product; (3) carrying out secondary-stage hydrofining on residual oil fractions; (4) carrying out fractional distillation on secondary-stage hydrofining oil; (5) carrying out clay refining on refrigerating machine oil distillate oil, thus obtaining high-additional value products such as the naphthenic base refrigerating machine oil base oil, naphtha oil, diesel oil and refrigerating machine oil base oil. The method has the advantages that the hydrogenation industrial chain of the coal tar oil is extended, the utilization value of the coal tar oil is increased, and the refrigerating machine oil base oil with the high quality is obtained.

The invention discloses a method for preparing diesel through coal tar. Hydrogen and the coal tar are distilled and mixed and then enter a reactor with the hydrogen and oil volume ratio of 850:1100. The reaction temperature is 290-365 DEG C, the reaction pressure is 2-9 MPa, and the air speed is 2-4/h. A reaction is conducted under the action of catalyst, and a liquid product is obtained after gas-liquid separation.

The invention relates to the technical field of asphalt modifiers, in particular to a method of preparing an asphalt modifier with waste lubricant, gear oil and coal tar. The method includes: mixing waste lubricant, gear oil and coal tar, using concentrated sulfuric acid as a catalyst to carry out intermolecular dewatering reaction under heating, flocculating, precipitating, filtering, and dryingto obtain the asphalt modifier. The waste lubricant, the gear oil and coal tar are used as raw materials; the concentrated sulfuric acid is used as the catalyst; the raw materials are low in price andeasy to attain; the production process is simple, convenient to perform and control and low in production cost. The asphalt modifier prepared herein helps improve strength and toughness of asphalt, improve pavement performance of an asphalt mixture at a high temperature, reduce permanent deformation at the high temperature, and improve the properties of the asphalt, such as rut resistance, fatigue resistance, aging resistance, resistance to low temperature cracking, and ability to resist low temperature fatigue.

The invention relates to preparation of activated carbon, in particular to a method for coal-tar-free preparation of desulfurization and denitrification activated carbon. The method comprises the following steps: 1) preparation of an adhesive solution: mixing sodium/calcium lignosulfonate with water, conducting standing in a water bath, and obtaining the adhesive solution after the sodium/calcium lignosulfonate is completely dissolved; and 2) preparation of desulfurization and denitrification activated carbon: mixing the adhesive solution obtained in the step 1) with pulverized coal and water in proportion to form coal paste, conducting molding by a granulator, conducting carbonizing and activating, conducting discharging, and conducting cooling and screening to obtain the desulfurization and denitrification activated carbon. The adhesive used in the invention is non-toxic and odorless, and can effectively reduce occupational health hazards to field operators. The adhesive is low in price and small in dosage, adhesive powder is dissolved in water to be prepared into a solution for use, and the preparation cost of the desulfurization and denitrification activated carbon is effectively reduced. In the using process of the adhesive, no organic matter volatilizes, and the problem of environmental pollution in the production process of desulfurization and denitrification activated carbon is solved.

A method for preparing a porous carbon material by using coal tar generated in a coke oven gas (COG) process is provided. The method includes: removing quinoline insoluble (QI) by mixing tetrahydrofuran (THF) with coal tar generated in a COG purification process; distilling coal tar by adding a phenolic resin to the QI-removed coal tar, and heating the same at a temperature of 100° C. to 330° C.; carbonizing the distilled coal tar by heating the same at 350° C. to 600° C.; mixing a carbide after the carbonization step and the coal tar, which has been distilled before the carbonization, and grinding/granulating the same; mixing the ground/granulated carbide and the coal tar, which has been distilled before the carbonization, with a pore forming agent, and heat treating the same at 300° C. to 500° C.; and forming pores by making the heat treated carbon material come into contact with water vapor at 700° C. to 1000° C.

The invention provides a method for preparing a negative electrode material by using medium and low temperature dry distillation coal tar. The medium and low temperature coal tar is used as a raw material, and the negative electrode is controlled by adjusting the content of quinoline insoluble matter, carbonization conditions, and graphitization conditions in the negative electrode material precursor preparation raw material. The structure of the material is used to prepare the negative electrode material. Compared with the existing technology, the beneficial effects of the present invention are: 1) The negative electrode material prepared by the present invention has high charging and discharging efficiency of the battery for the first time, stable battery performance, excellent cycle performance, outstanding anti-attenuation ability, and a gram specific capacity of up to 360mAh above. 2) The process method of the present invention is simple and feasible, easy to realize industrial production, provides a new way for the deep processing of medium and low temperature dry distillation coal tar, and significantly improves the added value of medium and low temperature dry distillation coal tar. 3) Conform to the country's call for efficient use of energy and alleviate the energy shortage.

The invention relates to a method for preparing vehicle fuel from light coal tar. According to the method, the light coal tar is subjected to fractionation, different isomerization treatment processesare adopted for different fractionation products, the vehicle fuel with the high octane number is obtained, and coal tar resources are fully utilized. The method has the advantages of being high in product purity, high in yield, simple in process and wide in application range.