23results about "Tar working-up by solvent extraction" patented technology

The present invention discloses a method for extracting phenolic compounds from coal tar in stages, which relates to the technical field of chemical separation. The method comprises the following steps: extractant II is mixed with coal tar through an extraction device to obtain coal tar I and extraction phase II; the extraction phase II is sequentially subjected to deep acidification with CO2 and oil-water separation to obtain a low-grade crude phenol oil product and aqueous phase II; the aqueous phase II enters a regeneration device for regeneration by heating, the obtained CO2 gas is recycled to the deep acidification device, and the regenerated extractant is mixed with supplemented fresh extractant to serve as extractant I. Extractant I is mixed with coal tar I through an extraction device to obtain extraction phase I and a dephenolized oil product; the extraction phase I is subjected to acidification and oil-water separation to obtain extractant II and a high-grade crude phenol oil. The present invention utilizes the selectivity difference of different extractants for different types of phenolic compounds in coal tar to realize the efficient extraction of phenolic compounds in coal tar and the preliminary separation of crude phenol oil, and significantly reduces the cost of subsequent treatment of dephenolized oil and crude phenol oil.

Methods of processing a coal-based feedstock to a high value product are provided. In one embodiment a method of processing a coal-based feedstock to a high value product, the method comprises the steps of: contacting the coal-based feedstock with one or more solvents under non-pyrolytic conditions thereby generating a liquid phase; and fractionating the liquid phase to generate at least two fractions under conditions such that at least one of the fractions is the high value product. The liquid phase may comprise 5 to 25 wt % oxygen and at least 70% of the oxygen in the liquid phase may be in the form of phenolic, carboxylic and ketone functional groups of hydrocarbon-based compounds.

The utility model provides rapid enrichment equipment for light hydrocarbon oil, medium hydrocarbon oil and crude phenol in medium and low temperature coal tar, which adopts five solvent storage tanks to store and take recovered solvents (acetone, carbon disulfide, petroleum ether, methanol and acetonitrile) in each step so as to be recycled in cycles; carrying out deliming treatment on the medium-low temperature coal tar by using an acetone / carbon disulfide mixed solvent; petroleum ether and methanol, petroleum ether and acetonitrile, and methanol and carbon disulfide are used for carrying out step-by-step double-solvent layered extraction on the de-ashed tar. The device disclosed by the utility model realizes rapid enrichment of target components in medium and low temperature coal tar, provides extract oil which is simple in composition and easy to process for subsequent secondary upgrading, and solves the problems of high energy consumption, difficulty in large-scale commercialization and the like in the prior art.

The present invention discloses a method for preparing upgraded tar by co-pyrolysis of lignite and waste plastic (PE). The method comprises the following steps: pre-treating the raw materials lignite and waste plastic (PE), uniformly mixing a certain amount of the treated lignite with the waste plastic (PE) in a mass ratio of 7:3 to obtain a lignite / waste plastic (PE) mixed sample, and adding the sample to a fixed-bed pyrolysis reactor; heating the lignite / waste plastic (PE) mixed sample in the fixed-bed pyrolysis reactor to 440-540°C under an N2 atmosphere for pyrolysis reaction; after the reaction is completed, the gaseous product is passed into a spherical cold trap filled with n-hexane solvent, the spherical cold trap being immersed in an ice-salt bath at 0-5°C to capture the pyrolysis liquid product; filtering the obtained pyrolysis liquid product to remove impurities, and then rotary evaporating to remove the n-hexane solvent to obtain upgraded tar. This method not only achieves the synergy of the pyrolysis processes of the two, but also increases the PE content in the raw materials to 30%, and most importantly, improves the quality of the tar and pyrolysis gas.

The invention relates to a novel high-temperature coal tar fraction separation process and system, and belongs to the technical field of coal tar processing, raw material tar is dehydrated to obtain anhydrous tar, the anhydrous tar is heated to 380 DEG C for reduced pressure distillation, three mixed oil, anthracene oil and maltha are extracted at the same time, the maltha and an organic solvent are mixed and heated to 310-330 DEG C, and the mixture is cooled to the room temperature to obtain the high-temperature coal tar fraction. And then carrying out supercritical extraction to obtain hard asphalt and an extraction mixture, and separating the extraction mixture to obtain an organic solvent and high-performance carbon material raw material asphalt. The high-temperature coal tar fraction separation process disclosed by the invention is simple to operate and stable in operation, and can be used for producing a high-performance carbon material asphalt raw material which contains ultralow QI (Quality Index) and ash content and is uniform and concentrated in molecular weight.

The present invention relates to a method for purifying a tar containing gas stream. The method comprises the steps of:a) contacting a tar containing gas stream with a washing liquid in a washing unit to obtain a tar containing washing liquid and a purified gas stream;b) adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid;c) cooling the extraction liquid;d) after cooling, separating the tar containing extractant from the regenerated washing liquid, ande) recirculating the regenerated washing liquid to the washing unit.

The invention discloses a method for segmentally extracting phenolic compounds from coal tar, and relates to the technical field of chemical separation. The method comprises the following steps: mixing an extraction agent II with coal tar through an extraction device to obtain coal tar I and an extraction phase II; the extraction phase II is sequentially subjected to CO2 deep acidification and oil-water separation, and a low-grade crude carbolic oil product and a water phase II are obtained; the water phase II enters a regeneration device to be regenerated through heating, obtained CO2 gas is circulated to a deep acidification device, and a regenerated extraction agent and a supplemented fresh extraction agent are mixed to serve as an extraction agent I; mixing the extraction agent I with coal tar I through an extraction device to obtain an extraction phase I and a dephenolized oil product; and carrying out acidification and oil-water separation on the extract phase I to obtain an extractant II and high-grade crude carbolic oil. According to the method, the high-efficiency extraction of the phenolic compounds in the coal tar and the preliminary separation of the crude carbolic oil are realized by utilizing the selectivity difference of different extraction agents on different types of phenolic compounds in the coal tar, and the subsequent treatment cost of the dephenolized oil and the crude carbolic oil is obviously reduced.

The invention discloses a method for separating phenolic substances in coal tar by constructing a deep eutectic solvent based on betaine and organic acid, and belongs to the technical field of deep processing of coal tar. The halogen-free eutectic solvent is synthesized by taking betaine as a hydrogen bond acceptor and organic acid as a hydrogen bond donor. Mixing the eutectic solvent with phenol-containing oil, heating, stirring, cooling and standing to divide a system into a dephenolized oil phase (upper phase) and a phenol-containing eutectic solvent phase (lower phase); and then, a proper back-extraction agent is adopted to perform back extraction on the phenol-containing eutectic solvent phase, after back extraction, rotary evaporation is performed to respectively obtain a phenol product, a regenerated back-extraction agent and a regenerated eutectic solvent, and the regenerated back-extraction agent and the regenerated eutectic solvent can be recycled. According to the method, efficient separation is achieved through hydrogen-bond interaction between the eutectic solvent and the phenolic substances, use of strong acid and strong alkali and generation of phenolic wastewater in a traditional chemical extraction method are avoided, equipment corrosion is prevented through the halogen-free characteristic, the phenol resource recycling rate is increased, and the coal tar quality is improved.

The invention discloses a coal tar component separation and directional upgrading method and system. The method comprises the steps that raw material coal tar and all logistics detection data are collected online, and component fingerprint vectors are constructed; an emulsification state quantity is calculated according to a raw material component fingerprint vector, a pretreatment separation working condition is subjected to closed-loop adjustment, and oil-water-solid collaborative removal and stable breaking of an emulsification system are realized; inputting the fraction component fingerprint vector into a quality prediction model in fractional distillation, generating a cutting point correction amount according to a quality prediction deviation, and adjusting a side-draw temperature set value, a side-draw amount set value and a reflux ratio set value in a linkage manner to stabilize a cutting boundary; according to a fingerprint threshold set and a path selection matrix, each fraction is automatically routed to enter at least two upgrading branches for treatment, upgrading discharged materials are retested, substandard material flows trigger a backflow bypass for retreatment, the backflow material flows must be subjected to recovery cutting and redistribution nodes, and a re-routing closed loop is executed; and high-consistency coal tar fractions and controllable-mass heavy residues which can be stably supplied are output.

This invention belongs to the field of needle coke preparation technology, and relates to a method and system for preparing needle coke by medium- and low-temperature coal tar extraction distillation-carbonization. The method includes: 1) extraction distillation, in which a mixed solvent and medium- and low-temperature coal tar are distilled and extracted to obtain circulating oil, circulating solvent, and refined pitch; 2) pitch carbonization, using a non-isothermal method and a combination of steam and circulating oil for coking, to carbonize the refined pitch to obtain semi-coke; 3) calcination of the semi-coke to obtain needle coke. This invention can obtain refined pitch with low heteroatom content and low quinoline insoluble content; the semi-coke obtained through non-isothermal static settling results in a uniform component distribution in the reaction system, good needle coke fiber structure, stable product quality, and high yield; the combined coking process effectively controls the molecular reactivity in the system, obtaining high-quality needle coke.

This invention discloses a polymeric ionic liquid for phenol adsorption and its preparation method, belonging to the field of functional polymer materials and environmental adsorption technology. The polymeric ionic liquid is formed by chemical bonding of a porous polymer framework (formed by polymerization of styrene and stilbene) with quaternary ammonium salt groups. The preparation method of the polymeric ionic liquid includes the following steps: First, using 4-vinylbenzyl chloride and 4-vinylbenzyl bromide as monomers and divinylbenzene as a crosslinking agent, a halogen-containing porous precursor is obtained under the action of an initiator. Second, the halogen-containing porous precursor is quaternized with 1,4-diazabicyclo[2.2.2]octane in ethanol to obtain the polymeric ionic liquid. The polymeric ionic liquid prepared by this invention has microporous, mesoporous, and macroporous structures, with a BET specific surface area of ​​400-800 m². 2 ・g ‑1 This invention is suitable for the efficient and selective adsorption and separation of phenols in coal tar. The preparation method of this invention is simple, operates under mild conditions, uses readily available raw materials, and is easily scalable for large-scale production.

To provide low CTE and low puffing needle coke more stably while dealing with changes in the properties of a feedstock. The low CTE and low puffing needle coke is obtained by mixing and coking a needle coke main feedstock of a coal tar-based heavy oil or petroleum-based heavy oil having a weak hydrogen donating property with a PDQI value expressed by equation (1) of less than 5.0, with a secondary feedstock having a strong hydrogen donating property with a PDQI value expressed by equation (1) of 5.0 or more, and calcining the obtained raw coke. [Equation (1)] PDQI=H %×10×(HNβ / H), wherein H % is a hydrogen amount (% by weight) obtained by elemental analysis, and HNβ / H is a ratio of β naphthenic hydrogen to total hydrogen measured by 1H-NMR.

The invention discloses a composite flocculant for deeply removing asphaltene and colloid in carbon black raw oil, which mainly adopts 1-vinyl-3-butylimidazolium tetrafluoroborate as a main flocculant, cocamidopropyl hydroxysulfobetaine as a first synergist and salicylaldoxime as a second synergist to form the composite flocculant, after carbon black raw oil is subjected to flocculation pretreatment by using the composite flocculant, the obtained purified oil is subjected to furfural refining, so that high-purity refined carbon black raw oil can be obtained, the dependence of high-end carbon black production on anthracene oil can be broken through, and high-performance carbon black can be stably produced by using cheap ethylene tar; therefore, the method has good industrial value and application prospect.

The invention discloses a tar residue treatment method, and belongs to the technical field of coking waste treatment, and the tar residue treatment method comprises the following steps: S1, pretreating and tempering tar residues to disperse large-particle blocks and preliminarily dissociate wrapped organic matters; s2, gradient solvent extraction and separation: adopting a two-stage extraction process, namely recycling light oil products and phenols through first-stage extraction and recycling medium tar and asphaltene through second-stage extraction; and S3, low-temperature catalytic pyrolysis of the raffinate residues: carrying out catalytic modification, low-temperature pyrolysis and heavy metal solidification on the raffinate residues subjected to two-stage extraction. S4, resource oriented utilization of the product; comprising the following steps: condensing and separating pyrolysis oil gas, and recovering pyrolysis oil; and after the pyrolysis carbon residue / ash is extracted and pyrolyzed, the total amount of polycyclic aromatic hydrocarbon in the final solid residue reaches the harmless standard. The tar residue can be efficiently separated and recycled at a high value, hazardous waste is completely converted into marketable products and safe building raw materials, and the win-win situation of environment and economic benefits is achieved.

The invention relates to the field of coal chemical industry, and discloses a method for preparing hard asphalt by solvent extraction of coal tar. The method comprises the following steps: mixing a first solvent with coal tar, heating and stirring, standing for a period of time, separating a first extract liquor on the upper layer, adding the first solvent into the raffinate again, heating, stirring, standing and circularly extracting to obtain a first raffinate, wherein the first solvent is selected from methanol or ethanol; and mixing a second solvent with the first raffinate, heating, stirring, standing, and separating an upper-layer second extract, the raffinate being the hard asphalt component, and the second solvent being selected from toluene or xylene. According to the method, high-quality hard asphalt is obtained by extracting coal tar step by step through two solvents, the softening point of the high-quality hard asphalt is high, and the content of toluene insoluble substances and quinoline insoluble substances is relatively high; the selected solvent is low in toxicity, low in boiling point and good in extraction effect, the extraction process is simple, the extraction temperature is low, and the solvent can be recycled; the method has the advantages of low energy consumption, less investment, stable quality of the hard asphalt product and less discharge of three wastes.

The invention relates to equipment for improving the raw material utilization rate of a needle coke solvent extraction pretreatment device, and belongs to the technical field of needle coke production, the equipment comprises a blanking main body, the bottom surface of the blanking main body is fixedly provided with a falling vertical pipe for separated material falling, and the bottom surface of the falling vertical pipe is fixedly provided with a mixing spherical shell for diluting and mixing; conveying connecting pipes used for conveying raw materials are fixedly mounted on the left side and the right side of the surface of the discharging body correspondingly, a conversion assembly used for converting falling is arranged on the left side of the surface of a falling vertical pipe, and an oil supplementing pipe used for supplementing oil is fixedly mounted on the upper side of the left face of the mixing spherical shell. According to the solvent extraction pretreatment device, the problem of continuous operation after the separation capacity of a solvent extraction pretreatment device of a needle coke device is broken through is solved, and the asphalt recovery rate of a coal tar device is increased while the environmental protection problem of waste residue treatment is solved.

To provide a method for obtaining low CTE, low puffing needle coke further consistently while adapting to changes in the properties of a raw oil.SOLUTION: The low CTE, low puffing needle coke is characterized by mixing a main raw oil for needle coke, which is a coal tar-based or petroleum-based heavy oil with low hydrogen donating ability having a PDQI value of less than 5.0 as shown in formula (1), with a secondary raw oil having high hydrogen donating ability with a PDQI value of 5.0 or more as shown in the formula (1), coking the mixture, and calcining the obtained raw coke. Formula (1) is expressed as PDQI=H%×10×(HNβ / H), where H% is the hydrogen content (wt.%) determined by elemental analysis, and HNβ / H is the ratio of β-naphthene hydrogen to total hydrogen measured by 1H-NMR.SELECTED DRAWING: None

The present invention relates to a method and system for recovering a polymerization inhibitor from styrene tar. First, styrene tar and a depolymerization solvent are mixed in a mixer and then fed into a separator. After standing and stratification, the upper layer liquid is fed into an inhibition filter, a sedimentation agent is added, and after sufficient reaction and filtration, a filtered solid and a filtrate are obtained. The filtered solid is fed into a solvent recovery device to remove the solvent to obtain a solid. The solid is fed into a premixing tank and mixed with water. The mixed liquid enters an impeller-type high-gravity reaction device and is introduced with carbon dioxide for reaction. The obtained solid is dried to obtain the recovered polymerization inhibitor. The present invention can efficiently recover the polymerization inhibitor from styrene tar without affecting the quality of the recovered solvent oil. Moreover, the overall cost is low and there is no problem of secondary pollution.

The invention belongs to the technical field of coal pitch and ethylene tar processing, and relates to an extraction separation method for supercritical fluid extraction separation of a coal pitch and ethylene tar mixture (hereinafter referred to as coal tar B), and the method comprises the following steps: preparing coal tar B and a liquid medicine, and mixing the coal tar B and the liquid medicine to form a mixed liquid; providing a supercritical fluid, respectively inputting the mixed solution and the supercritical fluid into two ends of an extractor, enabling the mixed solution and the supercritical fluid to reversely flow, extracting to obtain a first extracting solution, a first extract and a residual fluid mixture, and discharging the first extracting solution from the upper part of the extractor, discharging the first extract and residual fluid mixture from the lower part of the extractor; and carrying out separation treatment on the first extraction liquid for at least five times to obtain five or more extracts. According to the technical scheme provided by the invention, each component of the coal B tar can be accurately extracted and separated, and the value of each extract is improved.

To provide a method for producing a carbon fiber.SOLUTION: The method for producing a carbon fiber, comprises the steps of: contacting a coal-derived material with a mixture of a supercritical fluid solvent and a first cosolvent to remove at least some of a soluble component from the coal-derived material from and obtain an insoluble coal-derived fraction; separating the mixture of the supercritical fluid solvent and the first cosolvent from the insoluble coal-derived fraction; mixing the insoluble coal-derived fraction with the supercritical fluid to obtain a mixture of the supercritical fluid and an insoluble fraction; and separating the supercritical fluid from the insoluble fraction to obtain the carbon fiber.SELECTED DRAWING: Figure 8

The utility model discloses a tar separation device, which belongs to the technical field of tar separation and comprises a separation tank, a plurality of support columns are arranged at the bottom of the separation tank, the top of the separation tank is open and is provided with a sealing top, an outer ring plate is arranged in the separation tank, and a connecting plate is connected between the periphery of the outer ring plate and the inner wall of the separation tank. A baffle filter plate is embedded and clamped in the lower half part of the inner circumference of the outer ring plate, a rotating rod is arranged in the center of the outer ring plate, a plurality of stirring blades are connected to the outer circumference of the rotating rod, concave parts are arranged at the top end and the bottom end of the outer ring plate, and telescopic outer sleeves capable of stretching out and drawing back are arranged on the concave parts; a threaded rod driving the telescopic outer sleeve to stretch out and draw back is arranged on the telescopic outer sleeve. According to the tar separation device, carbon tetrachloride, water liquid and tar can be subjected to uniform internal circulation mixing, auxiliary rapid reaction and separation, and the tar and the water liquid can be discharged through the design of up-down discharging.

The present invention relates to a device for improving the raw material utilization rate of a needle coke solvent extraction pretreatment device, which belongs to the technical field of needle coke production. The device comprises a drop body, a drop vertical pipe for dividing and dropping materials is fixedly installed on the bottom surface of the drop body, and a mixing spherical shell for diluting and mixing is fixedly installed on the bottom surface of the drop vertical pipe. Delivery connecting pipes for raw material delivery are fixedly installed on the left and right sides of the surface of the drop body. A conversion component for converting the drop is provided on the left side of the surface of the drop vertical pipe. An oil replenishment pipe for oil replenishment is fixedly installed on the upper left side of the mixing spherical shell. A plurality of liquid level gauges for liquid level control are provided on the top surface of the mixing spherical shell. The present invention solves the problem of continuous operation of a needle coke solvent extraction pretreatment device after the separation capacity is broken through, and while solving the environmental protection problem of waste residue treatment, it also improves the asphalt recovery rate of the coal tar device.

The invention belongs to the field of coal tar processing, and particularly relates to a method for producing a crude phenol product by using coal tar as a raw material. The method comprises the following steps: by taking formamide as an extracting agent, separating phenol from raw material coal tar by adopting a multi-stage countercurrent extraction method to obtain first primary crude phenol; extracting the first primary crude phenol to remove neutral oil to obtain second primary crude phenol; separating phenol and formamide in the second primary crude phenol by adopting a reactive distillation method to obtain a crude phenol product and a mixed gas which is formed by decomposing the formamide and consists of CO and NH3; and separating the mixed gas by using a water washing method to obtain CO gas and ammonia water. According to the method, the purity of the crude phenol product is remarkably improved at low cost, and the method is suitable for a real coal tar system and has relatively high comprehensive utilization rate and economic benefit of coal tar.