103results about "Tar working-up by distillation" patented technology

The invention relates to a method for preparing spinnable mesophase pitch and carbon fibers from coal tar fractions, and belongs to the technical field of carbon materials. The method comprises the following steps: distilling and extracting aromatic hydrocarbon fractions in different distillation ranges from coal tar, activating the aromatic hydrocarbon fractions in one or more distillation ranges as raw materials, and carrying out non-catalytic polymerization reaction on one or more activated coal tar fractions and one or more non-activated coal tar fractions at a low temperature, and performing high-temperature polymerization reaction to obtain matrix asphalt, and performing reduced pressure distillation treatment, solvent extraction or inert gas purging to obtain the spinnable mesophase asphalt. The spinnable mesophase pitch has wide-area streamline optical texture distribution, good directional arrangement and orderliness, the mesophase content can reach 100%, the softening point is low, the coking value is high, the ash content is low, and the structure is controllable. The carbon fiber prepared based on the mesophase pitch is short in required oxidation time and has excellent performance.

The invention belongs to the technical field of new energy battery materials, and particularly relates to coated asphalt for a negative electrode of a new energy battery as well as a preparation method and application of the coated asphalt. The method comprises the following steps: mixing an ethylene tar raw material and a cross-linking agent, and carrying out a first hydroxide cross-linking reaction in an oxygen-containing atmosphere to obtain a reaction liquid after the first hydroxide cross-linking reaction; transferring the reaction liquid after the first hydroxide cross-linking reaction into a protective gas atmosphere, and carrying out a second hydroxide cross-linking reaction to obtain a reaction liquid after a second hydroxide cross-linking reaction; and cooling the reaction liquid after the second hydroxide cross-linking reaction to room temperature, and performing liquid phase volatilization, so that the obtained coated asphalt has the characteristics of high softening point, low quinoline insoluble content, low coating thickness, high integrity, high compactness and high yield, is easy to realize industrial application, and can solve the recycling problem of ethylene tar.

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 utility model discloses a coal tar dehydration device which comprises a distillation flask (3), a reflux condensate water collector (7) connected with the distillation flask (3), a first collection flask (11) connected with the lower part of the reflux condensate water collector (7), and a coiled pipe condenser (10) and a second collection flask (12) which are sequentially connected with the upper part of the reflux condensate water collector (7), and a flow guide fan blade (6) is arranged in the reflux condensate water collector (7). The coal tar dehydration device provided by the utility model has the characteristics of simplicity and convenience in installation and operation, thorough water separation, high dehydration efficiency and no discharge of irritant gas.

To disclose a pitch production system using coal tar or decant oil for coal-based or petroleum-based pitch.SOLUTION: Total pitch production yields are increased by heat treating distillate fractions from a pitch production process. A heat treatment system and process are disclosed in embodiments. A heaviest distillate having a highest molecular weight is subjected to heat treatment, though other embodiments contemplate heat treating a variety of combined distillate fractions. The heat treatment system requires heat soaking distillates at elevated temperatures of 459 to 535°C at a near-constant temperature with near-uniform flow. A fraction of the heat-treated distillate may be re-introduced to the pitch production system as a part of a continuous process.SELECTED DRAWING: Figure 2A

Embodiments of the present disclosure generally relate to extracts of coal, compositions thereof, and uses thereof. Embodiments of the present disclosure also generally relate to processes for extracting coal. In an embodiment is provided a composition that includes a C4 to C28 alcohol extract of coal. In another embodiment, compositions that include a C4 to C28 alcohol extract of coal are utilized in blends, pavement formulations, crack sealants, shingle coatings, adhesives, fuels, and asphalt or bitumen compositions that resist flow at ambient temperature. In another embodiment, compositions that include a C4 to C28 alcohol extract of coal are converted to a reaction product, where the reaction product is utilized in a pavement formulation or an anti-stripping agent.

The invention discloses a modified pitch production process based on medium and low temperature coal tar heavy components, and relates to the technical field of modified pitch, the modified pitch production process comprises the following steps: raw material pretreatment: filtering and centrifuging medium and low temperature coal tar; hydrotreating: mixing the primary tar and a hydrogen-donor solvent according to the mass ratio of 1: (0.3-0.5), and adding a catalyst for hydrocracking reaction to obtain a hydrogenated product; thermal polycondensation reaction: separating heavy components in the hydrogenation product by adopting reduced pressure distillation, and feeding the heavy components into a two-stage thermal polycondensation reactor to generate a modified pitch intermediate; and gas-liquid separation: enabling the modified pitch intermediate to sequentially pass through a high-temperature cyclone separator, a condensation system and a supercritical extraction tower, and separating out light oil gas, a medium fraction and a modified pitch product. When the production process provided by the invention is adopted to treat the medium and low temperature coal tar, a cross-linking agent does not need to be added, so that the content of quinoline insoluble substances is reduced to 5-12%, and the softening point reaches 240-280 DEG C.

Pitch products produced by systems and processes utilizing coal tar or decant oil for coal or petroleum based pitch are disclosed. Total pitch production yields are increased by heat treating distillate fractions from the pitch production process. A heat treatment system, process and products produced thereby are disclosed. The heaviest distillates having the highest molecular weights are subjected to heat treatment, though other embodiments contemplate heat treating a variety of combined distillate fractions. The heat treatment systems require heat soaking the distillate(s) at elevated temperatures of 459-535° C. at a near-constant temperature with near-uniform flow. A fraction of the heat-treated distillate may be reintroduced to the pitch production system as part of a continuous process.

The top of a first rectifying tower is connected with a first heat exchange unit, the bottom of the first rectifying tower is connected with a second preheater, the first heat exchange unit is connected with a first return tank, the first return tank is connected with the top of the first rectifying tower, and the second preheater is connected with a second rectifying tower. The top of the second rectifying tower is connected with the second heat exchange unit, the bottom of the second rectifying tower is connected with the first reaction kettle, the second heat exchange unit is connected with the second reflux tank, the second reflux tank is connected with the top of the second rectifying tower and the light oil receiving tank, and the upper ends of the first reaction kettle and the second reaction kettle are connected with the cooling unit; the first rectifying tower is respectively connected with the first reaction kettle and the second reaction kettle, the lower end of the second reaction kettle is connected with the short-path molecular distiller, and the short-path molecular distiller is connected with the heavy component receiving tank and the light component receiving tank. By adopting a modular structural design, the process flow can be adjusted as required, and meanwhile, the comprehensive utilization rate of ethylene tar is increased.

The invention discloses a tar distillation process for customized production. A device for the tar distillation process comprises a raw material tar tank, a dehydrating tower, a heating furnace, a main tower, an extraction valve, an extraction pipeline, a purging valve, a purging pipeline, a dephenolization oil tank, a naphthalene oil tank, an oil washing tank, an anthracene oil tank, a carbon black oil tank, an oil distribution tank and a configuration pipeline. The tar distillation process comprises the following steps: carrying out production adjustment by controlling start-stop combination of side-line naphthalene oil, washing oil and anthracene oil extraction, and customizing oil products by configuring pipelines. In the normal production period of the side line of the tar distillation process, flexible adjustment of extraction and extraction stopping aiming at a single component can be realized, and meanwhile, final products of other extracted components are not influenced; according to the requirements of markets or customers, oil is debugged and distributed in proportion, customized production of various oil products is flexibly achieved, and benefit maximization is achieved on the premise that the quality is met.

The invention discloses a green and environment-friendly fuel oil processing method and a waste gas treatment device thereof, and relates to the related field of waste gas treatment devices.The device comprises a fuel oil processing assembly, a combustible waste gas treatment assembly, a circulating waste gas treatment assembly, an amine liquid desulfurization tank assembly and a cooling assembly; the front end of the fuel oil processing assembly is fixedly connected with the combustible waste gas treatment assembly, the front end of the fuel oil processing assembly is fixedly connected with the circulating waste gas treatment assembly, and the right side of the front end of the fuel oil processing assembly is fixedly connected with the cooling assembly. Combustible waste gas treatment, circulating waste gas desulfurization and a cooling assembly are combined, efficient fuel oil production is achieved, gas detection, an electromagnetic valve and a check valve are adopted for enhancing safety, sulfur emission is reduced through amine liquid desulfurization, the resource utilization rate is increased through circulating hydrogen recycling, stable waste gas treatment is ensured through the cooling assembly, environment pollution is integrally reduced, and the environment protection performance is improved.

This invention discloses a tubular heating device for preventing coking of phenylene naphthalene, relating to the field of tubular furnace technology. It includes a furnace body, a waste heat recovery device, an air supply system, and a flue gas exhaust system. The furnace body comprises a radiant chamber and a convection chamber. Radiant furnace tubes are arranged vertically in a circumferential pattern within the radiant chamber, and convection furnace tubes are arranged in the convection chamber. A central burner is vertically mounted at the center of the bottom of the radiant chamber via a bracket. Several side burners are arranged circumferentially around the central burner on the upper surface of the bottom of the radiant chamber. A flame distribution sleeve is fitted over the central burner, with the upper end of the sleeve being an upward-opening trumpet shape and densely covered with distribution holes. This invention uses the central burner to compensate for insufficient heating of the upper radiant furnace tubes by the lower side burners. This results in a more uniform heat distribution within the radiant chamber, thereby avoiding localized overheating and reducing coking problems caused by localized heating of the radiant furnace tubes.

The utility model relates to the technical field of tar treatment, in particular to a tar dehydrating tower structure. In order to solve the problems in the prior art that the cost is higher, the occupied space is larger and the pressure and the temperature of the tower top are easy to fluctuate when separated light oil is conveyed to the tower top by adopting a light oil pump to control the temperature and the pressure of the tower top, the utility model provides a novel tar dehydrating tower structure. Comprising a dehydrating tower, a tar conveying pipeline, an anhydrous tar recovery pipeline, an anhydrous tar circulating pipeline, an anhydrous tar heat exchanger, an oil-gas mixture pipeline, a condenser and an oil-water separator. According to the utility model, the detection instrument is arranged on the pipeline, and the water content and the light oil quantity in the tar serve as the tar treatment capacity of the dehydrating tower, so that the pressure at the top of the tower is ensured to be constant; the water-free tar circulating pipeline is arranged, heat energy needed by the dehydrating tower is derived according to the water content and the light oil amount of tar, temperature control is conducted, and therefore the product quality is stable, the structure is simple, cost is low, and occupied space is small.

The integrated tar distillation method is characterized in that a tar distillation tower, an industrial naphthalene distillation tower and an asphalt reaction kettle are integrally arranged, and the integrated tar distillation method is characterized by comprising the following steps: a, raw material tar pressurized and sent by a raw material tank group through a tar pump is subjected to heat exchange through three-mixed oil, anthracene oil and medium-temperature modified asphalt and then enters a tar dehydration tower; b, the dehydrated anhydrous tar is pumped out from the bottom of the tower by an anhydrous tar pump, and a part of the dehydrated anhydrous tar is subjected to heat exchange through the anhydrous tar and high-temperature modified pitch heat exchanger and then enters a tar dehydrating tower, c, three-mixed oil is distilled out from the top of the tar distillation tower, d, anthracene oil is extracted from the top and the middle of the anthracene tower, and e, in a pitch reaction kettle, the anthracene oil is extracted from the top of the anthracene tower and the middle of the anthracene tower. The medium-temperature modified asphalt is produced from the medium-temperature asphalt through long-time standing polymerization reaction. The integrated tar distillation method has the advantages that energy consumption and carbon emission are reduced, energy consumption is reduced, heat loss is reduced, the occupied area is saved by about 30%, and energy consumption is saved by 46.7% compared with the standard energy consumption.

The utility model relates to the technical field of coal tar distillation, and discloses a coal tar deep processing pressure reducing device which comprises a washing oil buffer tank and a bottom plate, a cooler is fixedly connected to the bottom end of the left side of the washing oil buffer tank, and a connecting pipe is fixedly connected to the left side of the top end of the washing oil buffer tank. A tail gas ejector for pumping gas is fixedly connected to the other end of the connecting pipe, a vacuum pump is fixedly connected to the front end of the tail gas ejector, a residual oil ground groove is fixedly connected to the front side of the top end of the bottom plate, a product receiving tank is fixedly connected to the right side of the top end of the bottom plate, and a reduced pressure distillation tower is fixedly connected to the right side of the top end of the bottom plate. According to the utility model, the vacuum pump and the tail gas ejector are connected in series to work, so that the operation performance of the vacuum pump is improved, the stable suction capacity and vacuum are kept, the cavitation condition in the pump is reduced, and the ultimate vacuum of the vacuum pump is improved.

The invention discloses a method for preparing spinnable asphalt and asphalt-based carbon fibers from ethylene tar. The spinnable asphalt and the asphalt-based carbon fiber are prepared by adopting an ethylene tar catalytic cross-linking reaction process, compared with a traditional process, the yield of the spinnable asphalt is increased by 5-10%, various high-added-value byproducts exist, the ethylene tar is used as a raw material, the diversity of the raw material is enriched, and the production cost is reduced. The method for preparing spinnable asphalt and carbon fiber series products from ethylene tar is high in economic benefit.

The invention relates to the technical field of chemical engineering, in particular to a method and a system for recovering phenolic tar through enhanced rectification, and the method comprises the following steps: step 1, carrying out magnetization pretreatment on the phenolic tar to obtain magnetized phenolic tar; 2, pumping the magnetized phenol tar oil to a scraper film evaporator, adjusting the internal temperature of the scraper film evaporator to 220-250 DEG C, and adjusting the internal pressure of the scraper film evaporator to 4.0-5.5 kPa to obtain a first light component of the phenol tar oil and a first heavy component of the phenol tar oil; step 3, the first light component of the phenol tar enters a coarse distillation tower through a pipeline to be rectified, a second light component and a second heavy component are extracted, the second light component enters a phenol tower through a pipeline to be rectified, and phenol and a third heavy component are extracted; a magnetization technology is introduced as a pretreatment technology, and a molecular distillation technology is introduced as a secondary recovery technology, so that the separation process is greatly enhanced, the blocking risk is reduced, and effective separation and efficient recovery of the phenol tar are realized.

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 utility model discloses a pressurizing device for preparing washing oil from coal tar, and relates to the technical field of chemical separation. Comprising a preheating tank, a fixedly-connected feeding electromagnetic valve is arranged on the upper middle portion of the preheating tank, a fixedly-connected first heating device is arranged in the preheating tank, a preheating electromagnetic valve is arranged at the bottom of the preheating tank, a fixedly-connected material conveying pipe is arranged at the other end of the preheating electromagnetic valve, and a fixedly-connected material conveying electromagnetic valve is arranged at the other end of the material conveying pipe; the other end of the material conveying electromagnetic valve is provided with a fixedly connected fraction tank, the middle upper part of the fraction tank is provided with an oil conveying electromagnetic valve, the fraction tank is internally provided with a fixedly connected second heating device, the other side of the oil conveying electromagnetic valve is fixedly connected with an oil conveying pipe, and the other side of the oil conveying pipe is fixedly connected with an oil storage tank. The utility model aims to solve the technical problems that the content of methylnaphthalene in the produced washing oil is low, and the index of the washing oil is lower.

The invention belongs to an anthracene oil refining technology, and particularly relates to a process for refining anthracene oil from coal tar. An extraction agent A is injected in a liquid form and is mixed with anthracene oil fractions in a first refining chamber, the extraction agent A and the anthracene oil fractions enter a second refining chamber in a mixed liquid form through a filter screen plate, cooling water is continuously introduced into the second refining chamber through a circulating water jacket to complete crystallization, and an extraction phase is returned to the first refining chamber through the filter screen plate; the method comprises the following steps: introducing an extraction agent A into a first refining chamber, introducing an extraction agent B into a second refining chamber to carry out secondary extraction on an extraction residual phase, after secondary extraction, introducing a secondary extraction phase into the first refining chamber through a filter screen plate to obtain a mixed phase, and carrying out fraction treatment in a separation tower to obtain the extraction agent A, the extraction agent B, phenanthrene-containing oil and carbazole-containing oil, so that the separation efficiency can be greatly improved; the one-tower double-separation operation is completed in the refining tower, so that the process steps are greatly simplified, the system is greatly simplified, and the energy consumption is also effectively reduced.

The utility model belongs to the technical field of chemical equipment, and discloses a device for producing asphalt used as a raw material of a lithium battery cathode material, which comprises a matching groove, and the matching groove is sequentially communicated to a tar light oil heat exchanger, a tar naphthalene oil heat exchanger, a maltha tar heat exchanger, a tar preheater and a tar dehydrating tower through a tar pump; an oil-gas outlet is formed in the top of the tar dehydrating tower, and a dehydrated tar outlet is formed in the bottom of the tar dehydrating tower and sequentially communicated with the tar / maltha heat exchanger, the heating furnace and the atmospheric tower through pipelines; the atmospheric tower is sequentially provided with a clear oil outlet, a carbolic oil outlet, a naphthalene oil outlet, a tar washing oil outlet and a maltha outlet from top to bottom; the maltha outlet is sequentially communicated with the dehydrated tar / maltha heat exchanger, the maltha / tar heat exchanger and the maltha storage tank, the maltha storage tank is communicated with the reaction kettle through a pump, and a discharge port at the bottom of the reaction kettle is communicated with the asphalt collecting box. Products produced by the device can meet market requirements, and enterprise revenue is improved.

A method for forming mesophase pitch can include applying a stimulus to a first amount of coal tar to form a first amount of mesophase pitch. The stimulus can include one or more of an electromagnetic field (“EMF”) or a magnetic field. The method can further include evaluating a characteristic of the first amount of mesophase pitch, changing a parameter of the stimulus in response to evaluating the characteristic of the first amount of mesophase pitch, and applying the stimulus exhibiting the changed parameters to a second amount of coal tar to form mesophase pitch.

The invention discloses a high-anthraquinone anthracene oil preparation system, which comprises a raw material pretreatment unit, which is used for receiving crude anthracene oil and carrying out tempering, demulsification, filtration, dehydration and adsorption treatment on the crude anthracene oil; the separation and purification unit is configured to perform distillation separation on the purified anthracene materials; the refining and purifying unit is configured to perform oxidation reaction, crystallization, separation and drying treatment on the anthracene fraction; the tail gas and waste liquid treatment unit is configured to collect and treat tail gas, waste liquid and solid waste residues generated by each process unit; the control system comprises a controller, an execution component, a sensor and a valve, the execution component, the sensor and the valve are electrically connected with the controller, and the controller is configured to control actions of the execution component and the valve according to technological parameters collected by the sensor. According to the invention, the raw material pretreatment unit is used for carrying out whole-process fine treatment of tempering, demulsification, filtration, dehydration and adsorption on crude anthracene oil.

The invention relates to the technical field of chemical production, in particular to a separation system and a recovery method for carbonylation synthesis of acetic anhydride tar, and aims to solve the problem of waste of effective components. The invention provides a tar separation system for carbonylation synthesis of acetic anhydride. The tar separation system comprises a tar tower, a condenser, a gas-liquid separator, a liquid seal tank and an unqualified product tank, the tar tower, the condenser and the gas-liquid separator are sequentially connected, gas flowing out of the gas-liquid separator enters the liquid seal tank, and liquid flowing out of the gas-liquid separator enters the tar tower and the unqualified product tank; acetic anhydride is contained in the liquid seal tank, and the liquid seal tank is communicated with the unqualified product tank; and tar and methanol are introduced into the tar tower, so that the methanol reacts with acetic anhydride in the tar. According to the tar separation system for carbonylation synthesis of acetic anhydride, methanol is continuously introduced to react with tar, generated acetic acid and methyl acetate can be effectively recycled and used as raw materials to be reused for production of acetic anhydride, and waste of effective components is reduced.

The utility model discloses a coal tar distillation device, which relates to the technical field of deep processing of coal tar, and comprises a bottom plate, the top of the bottom plate is fixedly connected with a mounting plate, the top of the bottom plate is fixedly connected with a fractionation barrel, and the top of the bottom plate is provided with an evaporation mechanism. Through the mutual cooperation of the motor, the evaporation barrel, the heater and other components of the evaporation mechanism, when the evaporation mechanism needs to be used, an operator pulls the cover plate through the grip, so that coal tar is added into the evaporation barrel through the feeding hole of the evaporation barrel; then a motor is started to press the trigger end of a start button in the process that a pressing plate moves downwards to start a heater, when the heater is heated to 120-130 DEG C, coal tar in the evaporation barrel is evaporated, evaporated steam enters the fractionation barrel through a steam conveying pipe, and the effect of evaporating the coal tar is achieved through the design; coal tar is effectively converted into steam.

According to the tar filtering device with the pouring function, in the device, a shell is of a hollow interlayer structure; the deflection baffle is arranged in the interlayer of the shell and is communicated with the steam inlet to slow down the flow speed of steam in the steam inlet; the filter screen is arranged at a tar inlet in the top of the shell to filter tar guided into the inner layer of the interlayer of the shell; the tar outlet is formed in one end, far away from the filter screen, of the shell and communicated with the interlayer inner layer of the shell to lead out tar; the first isolation retaining wall and the second isolation retaining wall are arranged on the inner layer of the interlayer of the shell and extend upwards; the running track is arranged on one side of the shell, the running track comprises a lifting part vertically extending upwards and a bending part which bends and extends from the top end of the lifting part and is used for turning and dumping, the tar collecting barrel supporting plate is movably arranged between a lower running limit and an upper running limit, and the lifting oil cylinder is in driving connection with the tar collecting barrel supporting plate. The device is used for filtering impurities in the waste tar and removing moisture in the waste tar.

The utility model discloses a tar modifying and extracting device, which belongs to the technical field of tar processing and extracting equipment and comprises a fixed seat for connection, an electric heating device for heating is embedded in the fixed seat, and four support legs for fixing are further connected to the bottom of the fixed seat. Square plates used for increasing the contact area are welded to the bottoms of the supporting feet. The distillation barrel is used for modifying and extracting coal tar, the bottom of the distillation barrel is connected with an annular storage groove, the storage groove is formed in the top of the fixed seat, and the bottom of the storage groove is provided with a round hole connected with a discharge port in the bottom of the distillation barrel; the four fixing boxes are symmetrically arranged, the side walls of the fixing boxes are communicated with the side wall of the distillation barrel, a controller capable of being opened and closed is arranged in each fixing box, and the bottom of each fixing box is detachably connected with a collecting bottle used for collecting tar. According to the utility model, the tar collecting bottle can be replaced without interrupting the work of the distillation equipment, so that the practicability of the device is improved.

The invention discloses a raw gas dust and oil removal washing and gas water purification coupling device and process. The device comprises a high-pressure washing tower and a normal-pressure washing tower which are respectively provided with a filtering basket, a flow guide ring component, a herringbone heat exchange baffle plate, a filter, a defoaming wire mesh and a superheated steam stripping pipeline, high-temperature raw gas enters the high-pressure washing tower, and tar and pulverized coal particles are condensed and leached by a lower spraying structure and a purification auxiliary agent; the upper spraying structure is used for further chilling medium oil and water vapor carried by the raw gas and collecting the medium oil and water vapor into a liquid collector of the high-pressure washing tower, and qualified raw gas is extracted from the tower top; and then, further settling and separating the mixture of the oil and the water in the normal-pressure washing tower, and meanwhile, escaping a small amount of raw gas carried by the liquid, and purifying and recycling again under the spraying of a purifying auxiliary agent. The separation process not only recovers heat, but also efficiently cleans the raw gas, increases the yield of tar and medium oil, and reduces the COD value in the gas water and the load of a subsequent sewage treatment device.

The invention provides a system and a method for preparing mesophase pitch, the system for preparing mesophase pitch comprises a prepolymerization reactor and a continuous condensation separation reactor, the middle upper part of the continuous condensation separation reactor is provided with a feed inlet, an extraction port and an overflow port, the overflow port is positioned above the feed inlet, and the extraction port is communicated with the prepolymerization reactor. A lead-in port and a discharge port are respectively formed in the lower part and the bottom of the shell; the discharge port of the prepolymerization reactor is communicated with the feed port of the continuous condensation separation reactor through a pipeline, the overflow port is communicated with the feed inlet of the prepolymerization reactor through a pipeline, and the extraction port is communicated with the introduction port through a pipeline. According to the system and the method for preparing the mesophase pitch, the problem that continuous refining is difficult in the mesophase pitch preparation process can be solved, and the uniform quality of the obtained mesophase pitch product can be ensured.

The application relates to the technical field of chemical equipment, and provides a two-stage evaporator of a tar distillation device and a distillation process method.The two-stage evaporator comprises a shell, an overflow plate assembly, the overflow plate assembly is sequentially and alternately provided with a first overflow plate, a second overflow plate, a third overflow plate and a fourth overflow plate from bottom to top along the inner wall of the shell to form an S-shaped rising airflow path, wherein the first overflow plate is a meniscus structure and comprises an outer arc segment fixedly connected with the inner wall of the shell and an inner arc segment recessed towards the outer arc segment, a plurality of rectangular overflow weirs are arranged on the inner arc segment and uniformly distributed along the arc line direction of the inner arc segment, the second overflow plate, the third overflow plate and the fourth overflow plate are all semicircular structures and comprise a circular arc segment fixedly connected with the inner wall of the shell and a straight line segment away from the inner wall of the shell, and a plurality of streamline overflow weirs are arranged on the straight line segment and uniformly distributed along the length direction of the straight line segment.The application solves the problems of serious coking, low separation efficiency and short operation cycle of the traditional equipment.