111results about "Tar working-up by water removal" patented technology

The invention relates to a method and a device for purifying coal tar through coupling rotational flow, wherein the method for purifying the coal tar through coupling rotational flow comprises the following steps: (a) mixing coal tar feed with a trapping agent sufficiently so as to extract out saline matters dispersed in the coal tar; (b) performing liquid-liquid rotational flow separation on thecoal tar in which the dispersed saline matters are extracted out for separating out the saline matters so as to obtain desalinated coal tar; (c) keeping stand and depositing the desalinated coal tar so as to remove the moisture therein and obtain dehydrated coal tar; (d) performing solid-liquid rotational flow separation on the dehydrated coal tar so as to remove solid particles therein and obtain the coal tar without the solid particles; and (e) performing micro rotational flow separation on the coal tar without the solid particles so as to remove the micro moisture therein. The invention also provides a device for purifying the coal tar through the coupling rotational flow.

The invention discloses a process and complete equipment for pretreating coal tar. The complete equipment are an integrated pretreatment system jointly formed by a coal tar raw material storage tank (1), a three-phase centrifugal machine (3), an automatic back wash filter (5), a primary high-voltage electric field knockout drum (6), a secondary high-voltage electric field knockout drum (7) and the like. The process and complete equipment provided by the invention are suitable for the process requirements for large-scale deep pretreatment desalination, dehydration and impurity removal in a modern coal tar deep processing industry. The processing effects of the two-stage electric field knockout drums are greatly improved by using a high-voltage impulse power supply.

The invention provides a demulsification, neutralization and dehydration method of acidic emulsified tar. A certain proportion of demulsification agent, such as a nonionic surfactant, is added to the acidic emulsified tar for mixing, stirring, heating and standing to change performances of an tar-water interface and ensure that water drops in the W/O type emulsified tar are condensed, thereby achieving preliminary demulsification and preliminary separation of the tar from water; alkali is added for neutralization; waste heat of heat conduction oil for producing modified pitch is used to heat the preliminarily demulsified tar to 110-140 DEG C; pressure is increased to 0.2-0.4Mpa; the tar is subjected to flash evaporation and dehydration in a primary evaporator; the moisture is further reduced; the tar is neutral; and the dehydrated tar is prepared for use and can satisfy the distillation production.

The invention relates to a method used for producing bunker fuel oil by blending low-temperature carbonization coal tar. The method is to respectively measure the properties of the part over water and the part below water of the low-temperature carbonization coal tar, a blending experiment of the part over water and the part below water of coal tar is practiced according to the measurement result and bunker fuel oil standards and the main indexes of the blend oil are determined to obtain proper blending ration and polypropylene higher alcohols ester additive is added to get qualified bunker fuel oil.

The invention relates to a pretreatment method for deep processing of coal tar. A technology for carrying out deslagging, ammonia water removing, dephenolizing and desalting separation on the coal tar through centrifugal separation, gas backwashing filtering, distilling and high-voltage electric field is adopted, the pretreatment method is applicable to the pretreatment of high-temperature coat tar, medium-temperature coal tar and low-temperature coat tar, the separated ammonia water can be recycled, and phenols are sold as a chemical raw material directly or after the phenols are refined, so that the problems that wastewater containing ammonia and phenol is discharged, a hydrogen source of energy is wasted due to phenol hydrogenation, and the like are avoided, and the added value of the coal tar is increased.

The invention relates to a coal tar alkali-free normal/reduced-pressure distillation process and a coal tar alkali-free normal/reduced-pressure distillation device. In the process, raw material coal tar is subjected to heat exchange and delivered into a dehydrating tower, and light oil distillate and water are collected from the top of the dehydrating tower; the coal tar at the bottom of the dehydrating tower is subjected to heat exchange and delivered to a main tower, and a carbolic oil distillate is collected from the top of the main tower; a mixed oil distillate is collected from a lateralline; carbon black oil or soft asphalt is collected from the bottom of the tower; bottom material of the main tower is pumped out; part of soft asphalt is pumped out from the bottom of the main towerand delivered to an asphalt tower for distillation under a negative pressure, a heavy oil distillate is collected from a lateral line of the tower, and asphalt is produced at the bottom of the tower;and the main tower is a normal-pressure low-temperature distillate tower, the asphalt tower is a low-temperature reduced-pressure asphalt tower, and all distillates are not added with alkali in the whole flow. In the device, the bottom of the dehydrating tower is connected with the middle of the main tower through a pipe, and the bottom of the main tower is connected with the middle of the asphalt tower through a pipe. The internal circulation at bottom of the main tower is realized through a heating furnace, and internal circulation at the bottom of the asphalt tower is realized through a heating furnace. The process and the device have the advantages that: all distillates are not added with alkali; distillates are cut according to market demands and temperature gradient; direct super-heated steam is not used; new process waste water is avoided; the energy consumption is low; the product quality is high; and the like.

The invention provides a preparation method of low-ash high-property mesophase pitch. The method comprises the steps that the raw material coal tar is purified, a fraction is put into a reaction kettle, temperature programming and heat preservation are conducted in sequence, and purified coal tar pitch is obtained. The purified coal tar pitch and a co-carbonization agent are mixed, the mixture is added into a high pressure reactor, under certain pressure condition, the temperature is increased to a certain temperature, then heat preservation is conducted, and the mesophase pitch is obtained. According to the method, a series of physical methods such as gravity settlement centrifugation and circulating filtration are adopted to purify the coal tar, the very good effect of removing ash impurities is achieved, quinoline insoluble matter formed by mesophase is especially hindered, the content of the mesophase pitch ash is lower than 50 ppm, the content of mesophase reaches up to 100%, and carbon fibers with excellent properties can be prepared continuously; meanwhile, by mixing the pitch with the co-carbonization agent, the rheological property of the mesophase pitch is improved. Compared with a coal tar pitch purification process, the coal tar purification technology is simple, the cost is low, and the high-purity purified coal tar pitch can be obtained through preparation, so that the low-ash high-property mesophase pitch is obtained.

The invention discloses a method for carrying out treatment and regenerative cyclic utilization on semi-coke wastewater and recycling resources. The method comprises the steps of (1) coarse filtration, (2) membrane filtration, (3) coal tar recovery, (4) phenol recovery, (5) ammonia recovery, (6) anaerobic treatment, (7) aerobic treatment, (8) electrolysis, (9) secondary anaerobic treatment, (10) membrane treatment or biochemical reaction of a biological aerated filter, and (11) desalting. According to the method, through a combined treatment process of the membrane filtration, the coal tar recovery, the phenol recovery, the ammonia recovery, the anaerobic treatment, the aerobic treatment, the electrolysis, the desalting and the like, the semi-coke wastewater is deeply treated, so that the resources such as coal tar, phenol and ammonia are recycled, and the treatment cost of the semi-coke wastewater is greatly reduced.

The invention provides a method of separating components of coal tar. The method comprises the steps of: adding the coal tar to a separation column; sequentially eluting the separation column by using a first solvent, a second solvent, a third solvent and a fourth solvent so as to respectively obtain a saturated hydrocarbon component, an aromatic component, a light polar substance component with the average molecular weight of 302-333 and a heavy polar substance component with the average molecular weight of 425-525; the elution terminal point of the first solvent is judged by an indicator; and the elution terminal points of the second solvent, the third solvent and the fourth solvent are judged through refractive indexes; the first solvent is selected from normal hexane, pentane or butane; the second solvent is selected from methylbenzene, benzene or xylene; the third solvent is selected from methyl alcohol or ethyl alcohol; and the fourth solvent is selected from tetrahydrofuran. The method has the advantages that the different components are eluted by adopting the simple separation on the column through different elution solvents, each component can be obtained by using the aromatic hydrocarbon indicator and the refractive index for separation, and the method is simple and convenient to operate and convenient for determining the property and quantity of the coal tar components, and the solvents are easy to obtain.

The invention provides a resourceful treatment process of tar residue. The resourceful treatment process is characterized in that demulsification dehydration, solvent extraction and centrifugal separation are taken as the core, distillate oil, obtained at the temperature of 200-230 DEG C, of coal tar is used as a main extracting agent, a small amount of crude benzene and industrial naphthalene areadded so as to form a composite extracting agent, and the proportion of all the components used in the process is as follows: 90-95wt/% of the distillate oil, obtained at the temperature of 200-230 DEG C, of the coal tar, 4.1-9.7wt/% of the crude benzene and 0.3-0.9wt/% of the industrial naphthalene; a technology of combining heat extraction and centrifugation is adopted under the conditions thatthe temperature of the demulsification dehydration is 35-55 DEG C, extraction temperature is 55-60DEG C, the pressure is 101.325kPa, the pump circulating flow rate is 15-20m<3>/h, the extraction timeis 3-4h, the centrifuge rotating speed is 2500-3000r/min, and the like, so that the recovery rate of tar in the tar residue reaches up to 95% or above. The resourceful treatment process is verified to be capable of well adapting to the raw material tar residue with water content of 20-60% in the aspect of raw material adaptability; the extracting agent used in the process does not need to be recovered after oil-water-residue separation is finished, can be directly used as an oil product component in the oil so as to be stored and utilized, and does not need to be recycled, so that the separation link is simplified, waste is avoided, and energy is saved; the resourceful treatment process effectively solves the problems of the tar residue in the aspects of energy utilization and environment-friendly treatment.

The invention relates to a method for processing low-temperature pyrolyzed coal tar. The method comprises the following steps of: pressurizing and standing low-temperature coal tar to be pyrolyzed, dehydrating initially by changing surface tension, adding a demulsifying agent to form azeotropic water through light oil circulation and performing final dehydration; extracting crude phenate from the dehydrated low-temperature coal tar by alkaline washing; purifying the extracted crude phenate through oil-water mixed gas and decomposing through carbon dioxide so as to obtain crude phenol; and dehydrating the obtained crude phenol, deslagging and rectifying so as to obtain a target product. By the method, the phenol extraction rate of the low-temperature pyrolyzed coal tar is over 95 percent, the problem of difficult oil and water separation can be solved and the dehydration rate after processing is between 0.5 and 1 percent. The method is a processing method which has low cost and reasonably utilizes a low-temperature coal tar resource.

The invention discloses a coal tar deep processing technology based on four mixed fractions. The coal tar deep processing technology comprises the following steps: heating raw material tar by a coke tar heat exchanger to 105-130 DEG C and then entering into a dehydrating tower with 4-12 layers of trays; separating out water and partial light oil from the tower top of the dehydrating tower, and separating out anhydrous tar from the tower bottom of the dehydrating tower; processing the dehydrated tar through a conductive oil heat exchanger and heating to 240 DEG C-300 DEG C by a tubular heating furnace, and then entering into the lower middle part of a main tar tower which is provided with 15-35 layers of trays and is provided with 2-10 layers of trays in a stripping section; performing heating circulation by using the tubular heating furnace at the tower bottom; washing four mixed fractions with light phenol naphthalene cut at the tower top, cooling the four mixed fractions and dephenolizing to obtain a phenol product and a washed fraction, and processing the washed fraction in an industrial naphthalene processing device so as to obtain dephenolized phenol oil, an industrial naphthalene product and high-quality absorber oil; and obtaining mixed oil from the tower bottom, wherein the mixed oil can be directly used for producing high-quality carbon black or mesothermal pitch according to the market conditon.

The invention provides an oil extraction and slag removal method and system for a vertical tar-ammonia water separating process. The system comprises a mechanical slag scrapping tank, a tar-ammonia water separating tank used for receiving a mixture of tar, ammonia water and small-granule tar slag obtained in primary separation, a tar slag pump used for extracting the small-granule tar slag and the tar at the bottom of the tar-ammonia water separating tank, a secondary slag removal apparatus used for receiving the small-granule tar slag and the tar extracted from the bottom of the tar-ammonia water separating tank through the tar slag pump and carrying out secondary separation on the small-granule tar slag and the tar, a tar slag bucket used for receiving large granule tar slag obtained in primary separation and small-granule tar slag obtained in secondary separation and a tar intermediate tank used for receiving tar discharged from the secondary slag removal apparatus and having undergone secondary separation. The system has the advantages of convenience in extraction of the tar, good tar slag removal effects and capacity of thorough discharge of the small-granule tar slag from the system, so blockage of the system is avoided and production of the system is continuous and stable.

The invention relates to a reclaimed rubber plasticizer and a preparation method thereof, and belongs to the fields of environmental protection and chemical industry. All the reclaimed rubber plasticizers in the region adopt high-temperature coal tar. Due to the adjustment of raw materials of a coking plant and a process, the quality stabilization of the reclaimed rubber plasticizer is influenced. In a rubber product made of the reclaimed rubber, due to the sublimation of naphthalene, a layer of white sublimated naphthalene is condensed on the surface of the product so as to influence the quality of the product. Coal tar slag in the coking plants in the region is dumped out of the plants as rubbish, so that resources are wasted and environments are polluted. In order to solve the problems, the invention provides the reclaimed rubber plasticizer and the preparation method thereof. The preparation method comprises the following steps of: separating the coal tar from coke powder in the coal tar slag by an anthracene oil extracting process to obtain the coal tar with lower naphthalene content; dehydrating the coal tar with lower naphthalene content; and adjusting the viscosity of the dehydrated coal tar to prepare the reclaimed rubber plasticizer with stable quality. When the produced reclaimed rubber plasticizers are conveyed to a plurality of reclaimed rubber manufacturing plants to be used, the using amount is low, the quality is stable, and no white sublimated naphthalene is on the surface of the product.

The invention belongs to the field of coking chemical products in metallurgical coking industry and particularly relates to a technique and a device for preventing deposition and blockage of tar residues of a tar system. The technique is characterized in that fluid dredging devices are arranged at positions liable to generate deposition and blockage in a tar-ammonia water separating tank and a tar storage tank, and the fluid dredging devices are controlled by controllers to periodically work so as to eliminate the blockage phenomenon caused by the deposition of tar residue. The device comprises a first fluid dredging device and a second fluid dredging device, wherein the first fluid dredging device is of a hollow tubular structure and is arranged along the bottom part of a conical groove of the tar-ammonia water separating tank in parallel, and the second fluid dredging device is of a multi-branch tubular structure and is arranged at the bottom part of the tar storage tank in parallel. Compared with the prior art, the technique and the device have the advantages that (1) the tar residue deposition and pipeline blockage phenomena of the equipment are greatly improved; (2) the operation continuity is improved and the maintenance time is greatly decreased; (3) the operation of an ultracentrifuge is stable and the separating effect is greatly improved; and (4) the operating environment is obviously improved and the safety is high.

The invention relates to a method for treating coal chemical industry sewage, which is a breakthrough in coking industry sewage treatment and mainly solves the problem that macromolecular substances in coking sewage can not be easily degraded. In the development process, the formation structure of the substances is analyzed: the larger the molecular weight is, the stronger the intermolecular power is, and the higher the boiling point of the substance is. Since nondegradable substances and degradable substances have different boiling points, the nondegradable substances in the coking sewage can be separated by a technical line of concentration by evaporation; and since the condensed sewage containing micromolecular substances, which is separated by evaporation, has strong biochemical quality and low salinity, the condensed sewage can easily reach the standard when being subjected to biochemical sewage treatment, and the treated water can be directly used as compensation water of circulating water, thereby recycling the sewage. The technology is mainly used in high-concentration coking sewage treatment industry, and can also extend to nondegradable-substance-containing sewage treatment in coal chemical industry.

The present invention provides a movement part-free low-consumption and high-efficiency ammonia water, tar and tar residue separation dewatering integration tank, which comprises a tank, a mixing liquid inlet pipe, an ammonia water outlet pipe, a tar outlet pipe, a tar residue outlet pipe, a heating coil pipe, a tar residue separator, a tar residue dewatering device and a cleaning pipe. The working principle is that: a mixing liquid entering the tank is separated through a tar residue separator centrifugal force effect to obtain tar residue, the tar residue is dewatered through the tar residue dewatering device, different specific gravities of hot ammonia water and tar are adopted to separate ammonia water and tar, and heat energy of hot ammonia water in the heating pipe is adopted to dewater the tar. A main purpose of the present invention is to achieve purposes of no movement part operation during an ammonia, tar and tar residue separation and dewatering process, material cost reduction, tar residue water content reduction, separation effect improvement and energy consumption reduction.

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 resourceful treatment system of coking distillation residues. The system comprises a horizontal-flow type sedimentation tank, a coal tar tank, a coal tar residue tank, a series-connected centrifugal separator, a distillation tower, a pulverizer, a charging hopper, a discharging hopper, a uniformly-mixing bucket, a drying kiln, a ball crusher, a pelletizer and a vertical furnace. The invention also discloses a treatment method of the coking distillation residues in the system. The method comprises the following steps of: primarily separating ammonia water, coal tar and coal tar residues by virtue of the horizontal-flow type sedimentation tank; separating coarse coal tar and coarse tar residues which are obtained by primary separation for twice by virtue of the series-connected centrifugal separator; feeding the separated coal tar to the distillation tower to distill; feeding the separated tar residues to the pulverizer to pulverize and uniformly mixing with pellet raw materials; drying, pulverizing and pelletizing; and feeding to the vertical furnace to incinerate. According to the system, the coal tar and the tar residues are effectively separated by using a repeatedly-separating device, the coal tar is distilled into fractions with different boiling points through the distillation tower, and the tar residues and the pellet raw materials are fed to the vertical furnace to incinerate after being uniformly mixed, dried, pulverized and pelletized, so that resource recycling is realized while environment protection is realized at the same time.

The invention relates to a coal tar alkali-free short-flow normal/reduced-pressure distillation process and a coal tar alkali-free short-flow normal/reduced-pressure distillation device. In the process, raw material coal tar is subjected to heat exchange and delivered to a dehydrating tower, and light oil distillate and water are collected from the top of the dehydrating tower; coal tar at the bottom of the dehydrating tower is subjected to heat exchange and delivered to a main tower, and a carbolic oil distillate is collected from the top of the main tower; a mixed oil distillate is collected from a lateral line; soft asphalt or carbon black oil is collected from the bottom of the tower; and the bottom material of the main tower is pumped out, heated and returned to the bottom of the main tower to serve as a heat source for the main tower. Normal-temperature operation is adopted in the dehydrating tower, normal-pressure or reduced-pressure operation is adopted in the main tower, and all distillates are not added with alkali in the whole flow. The device comprises the dehydrating tower, the main tower and a heating furnace, wherein the bottom of the dehydrating tower is connected with the middle of the main tower through a pipe; the bottom of the main tower is connected with a soft asphalt or carbon black oil pipe; the middle of the main tower is connected with a mixed oil pipe; and the top of the main tower is connected with a carbolic oil pipe. The process and the device have the advantages that: the flow is short; alkali is not added; direct super-heated steam is not used; new process waste water is avoided; energy consumption is low; product quality is high; and the like.