Phenol tar metal impurity removal device

Abstract

The embodiment of the utility model belongs to the field of impurity removal of phenol tar (also called phenol residual oil, hereinafter collectively called phenol tar), and relates to a phenol tar metal impurity removal device. Comprising a dispersing and stirring mechanism, a metal impurity condensing mechanism, a dehydrating mechanism and a filtering mechanism which are sequentially communicated, the dispersing and stirring mechanism is used for dispersing water in the phenol tar into the phenol tar; the metal impurity condensing mechanism is used for condensing metal impurities of the phenol tar into coagulated metal impurities; the dehydration mechanism is used for removing water in the phenol tar coagulated metal impurity mixture; and the filtering mechanism is used for filtering the dehydrated phenol tar coagulated metal impurity mixture to remove coagulated metal impurities so as to obtain pure phenol tar. According to the technical scheme, under the environment that moisture and phenol tar are fully mixed, metal impurities are condensed firstly, then dehydration and impurity removal are conducted, and the impurity removal environment is stable and efficient.

Description

Technical Field

[0001] This application relates to the field of phenol tar impurity removal technology, and more specifically, to a device for removing metallic impurities from phenol tar. Background Technology

[0002] Phenol tar is a byproduct generated during petroleum cracking, reforming, distillation residues, chemical production, and waste treatment. It is a black, viscous liquid with a density of 1.01–1.20 g / cm³ at 20°C under standard conditions. Phenol tar contains benzene, toluene, xylene, phenol, phenolic methylstyrene, acetophenone, cumylphenol, naphthalene, anthracene, phenanthrene, and other components, as well as compounds such as S, N, and O, quinoline-insoluble substances, and metallic impurities mainly including K, Na, Fe, Ca, Mg, Ni, V, Cu, and Zi.

[0003] Phenolic tar is now listed in the National Hazardous Waste Inventory and Exemption List. It can no longer be used as fuel in boilers, heating furnaces, brick kilns, or ships as it was in the past. If it is to be used, it must be disposed of in accordance with hazardous waste management requirements to prevent environmental pollution, especially dioxin pollution. However, phenolic tar contains benzene, toluene, xylene, phenol, phenolic methylstyrene, acetophenone, cumylphenol, naphthalene, anthracene, phenanthrene, and other components. After removing impurities, these components are valuable chemical raw materials. In addition, after removing metallic impurities, phenolic tar is a good source of carbon black. Through hydrocracking, phenolic tar can also produce diesel, kerosene, naphtha, and liquefied petroleum gas. Furthermore, phenolic tar can be used as a raw material in the coatings industry.

[0004] Existing methods for removing metallic impurities from phenol tar involve adding reagents to settle and separate metallic impurities and other quinoline-insoluble substances. However, this method takes 48-72 hours or longer, requires a large amount of storage tanks, and has a yield of only 60-80%. The highly concentrated liquid at the bottom of the tank also requires secondary environmental treatment. Another method is vacuum distillation, which cuts metallic impurities, quinoline-insoluble substances, asphaltenes, gums, and other heavy components at the bottom of the vacuum distillation tower and discharges them from the bottom of the tower. The upper part of the tower produces relatively pure phenol tar. However, this method is complex, energy-intensive, requires large equipment investment, has a yield of only about 85%, and also generates a large amount of hazardous waste that requires secondary environmental treatment. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of this application is to change the existing methods for removing metal impurities from phenol tar from being complex, time-consuming, low-yield, and generating a lot of hazardous waste to being simple, low-energy, high-yield, and reducing the amount of hazardous waste generated to less than 1%, so that phenol tar becomes a useful and economically beneficial industrial product or raw material.

[0006] To solve the above-mentioned technical problems, this application provides a phenol tar metal impurity removal device, which adopts the following technical solution: A phenol tar metal impurity removal device includes a dispersion and stirring mechanism, a metal impurity condensation mechanism, a dehydration mechanism and a filtration mechanism connected in sequence.

[0007] The dispersion and stirring mechanism is used to disperse and mix the moisture in the phenol tar.

[0008] The metal impurity condensation mechanism is used to obtain the phenol tar output by the dispersion and stirring mechanism, and to heat the phenol tar to a first temperature and then fully mix it with the pre-prepared first group of drug solutions. After that, some water is removed by flash evaporation, some metal impurities are periodically discharged, and then it is mixed with the pre-prepared second group of drug solutions. After that, it is heated to a second temperature so that the metal impurities in the phenol tar react with the drugs in the second group of drug solutions and condense the metal impurities into a phenol tar-containing ionized agglomerate metal impurity mixture.

[0009] The dehydration mechanism is used to obtain the phenol tar mixture with ionic agglomerates of metallic impurities output from the metallic impurity condensation mechanism, and to remove moisture.

[0010] The filtration mechanism is used to obtain the dehydrated phenol tar mixture with ionic agglomerates and metal impurities output by the dehydration mechanism, and to filter out the agglomerates and metal impurities to obtain pure phenol tar.

[0011] Furthermore, the dispersing and stirring mechanism includes a storage tank and a feed pump. The feed end of the storage tank is connected to an external pipeline for obtaining phenol tar containing metallic impurities. The discharge end of the storage tank is connected to the feed end of the feed pump, and the discharge end of the feed pump is connected to the feed end of the first shell-and-tube heat exchanger.

[0012] Furthermore, the metal impurity condensation mechanism includes a first shell-and-tube heat exchanger, a first mixing assembly, a flash tank, a first booster pump, a second mixing assembly, and a second shell-and-tube heat exchanger. The feed end of the first shell-and-tube heat exchanger is connected to the discharge end of the feed pump. One feed end of the first mixing assembly is connected to the discharge end of the first shell-and-tube heat exchanger, and the other feed end of the first mixing assembly is connected to the outside to obtain a pre-prepared first set of pharmaceutical solutions. The feed end of the flash tank is connected to the discharge end of the first mixing assembly, and one discharge end of the flash tank is connected to the feed end of the oil-water recovery system for discharging flash liquid. The distilled light component oil and water vapor are connected to the outside via another outlet of the flash tank for periodic discharge of solid metal impurities. The third outlet of the flash tank is connected to the inlet of the first booster pump. One inlet of the second mixing assembly is connected to the outlet of the first booster pump, and the other inlet of the second mixing assembly is connected to the outside to obtain a pre-prepared second set of pharmaceutical solutions. The inlet of the second shell-and-tube heat exchanger is connected to the outlet of the second mixing assembly, and the outlet of the second shell-and-tube heat exchanger is connected to the inlet of the super gyratory tube, for outputting a mixture of phenol tar with ionic agglomerated metal impurities.

[0013] Furthermore, the first mixing assembly includes a first liquid tank, a first volumetric pump, a first heat exchange box, and a first static mixer. The first liquid tank, the first volumetric pump, and the first heat exchange box are sequentially connected to one inlet of the first static mixer, and the other inlet of the first static mixer is connected to the outlet of the first shell-and-tube heat exchanger. The outlet of the first static mixer is connected to the inlet of the flash tank. The second mixing assembly includes a second liquid tank, a second volumetric pump, a first heat exchange box, and a first static mixer.

[0014] The second volumetric pump, the second heat exchange box, and the second static mixer are connected in sequence. The second liquid tank, the second volumetric pump, the second heat exchange box, and the second static mixer are connected at one inlet end. The other inlet end of the second static mixer is connected to the outlet end of the first booster pump. The outlet end of the second static mixer is connected to the inlet end of the second shell-and-tube heat exchanger.

[0015] Furthermore, in the phenol tar metal impurity removal device, the bending radius of the pipe bend is 2 to 4 times the nominal diameter of the bend; the inner surfaces of the pipes, bends, and shell-and-tube heat exchangers through which the phenol tar flows are all coated with a layer of wear-resistant, corrosion-resistant, and low-friction coefficient polytetrafluoroethylene coating.

[0016] Furthermore, the dehydration mechanism includes a super gyratory tube, a second booster pump, and an oil and water recovery system. The feed end of the super gyratory tube is connected to the discharge end of the second shell-and-tube heat exchanger. One discharge end of the super gyratory tube is connected to the feed end of the oil and water recovery system to discharge the water vapor discharged from the central area of ​​the super gyratory tube. The discharge end of the second booster pump is connected to the feed end of the horizontal screw (or vertical screw) sedimentation centrifuge.

[0017] Furthermore, the filtration mechanism includes a horizontal spiral (or vertical spiral) sedimentation centrifuge, an intermediate tank, a third booster pump, a plate and frame pressure filter (or a closed diatomaceous earth filter), and a pure phenol tar output pipeline connected in series. The feed end of the horizontal spiral (or vertical spiral) sedimentation centrifuge is connected to the discharge end of the second booster pump. One discharge end of the horizontal spiral (or vertical spiral) sedimentation centrifuge is connected to the outside for discharging solid metal impurities. The liquid phase discharge end of the horizontal spiral (or vertical spiral) sedimentation centrifuge is connected to the feed end of the intermediate tank. The discharge end of the intermediate tank is connected to the feed end of the third booster pump. The discharge end of the third booster pump is connected to the feed end of the plate and frame pressure filter (or the closed diatomaceous earth filter). The discharge end of the plate and frame pressure filter (or the closed diatomaceous earth filter) is connected to the pure phenol tar output pipeline. When the pressure difference between the feed end and the discharge end of the plate and frame pressure filter (or the closed diatomaceous earth filter) reaches the set value, the machine body is disassembled to remove solid metal impurities in front of the stainless steel wire mesh (or the pre-coated membrane of the closed diatomaceous earth filter).

[0018] Furthermore, the filtration mechanism also includes a solid discharge end sealing box for a horizontal spiral (or vertical spiral) sedimentation centrifuge, a body sealing box for a plate and frame pressure filter, and a vacuum pump. The discharge end of the solid discharge end sealing box of the horizontal spiral (or spiral) sedimentation centrifuge and the discharge end of the body sealing box of the plate and frame pressure filter are connected in parallel by a pipeline and then connected to the feed end of the vacuum pump. The discharge end of the vacuum pump is connected to the feed end of the toxic and harmful gas absorption and separation unit, which is used to collect the toxic and harmful gases generated during the production process and then transport them to the toxic and harmful gas absorption and separation unit for harmless treatment through the matching pipeline.

[0019] Furthermore, the filter screen used in the plate and frame pressure filter is a stainless steel wire mesh with a specification of 20 μm to 1 μm.

[0020] Furthermore, the aforementioned phenol tar metal impurity removal device is a stationary device, but it can also be manufactured as a [type of device].

[0021] A skid-mounted device consisting of one or more skids.

[0022] Compared with the prior art, the phenol tar metal impurity removal device of this application embodiment has the following advantages: by dispersing the water in the phenol tar containing metal impurities to be treated and mixing it evenly with the phenol tar, the uneven temperature distribution caused by the evaporation of water due to its high specific heat capacity during subsequent reactions is avoided; the metal impurities are condensed in an environment where water and phenol tar are evenly mixed, followed by water removal, filtration of ionized agglomerated metal impurities, and treatment of toxic and harmful gases. The entire metal impurity removal reaction environment is stable and efficient, which can effectively remove metal impurities from phenol tar and avoid problems such as long separation time between phenol tar and metal impurities, which requires a lot of storage tanks, complex processes, large equipment investment, low yield, and the generation of a lot of hazardous waste that requires secondary harmless treatment. Attached Figure Description

[0023] To more clearly illustrate the solution of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the phenol tar metal impurity removal device in one embodiment of the present invention; Figure 2 Figure 1 shows a schematic diagram of the metal impurity condensation mechanism.

[0025] Figure 3 is a schematic diagram of the structure of the first drug mixing component in Figure 2;

[0026] Figure 4 is a schematic diagram of the structure of the second drug mixing component in Figure 2;

[0027] Figure 5 is a schematic diagram of the dehydration mechanism in Figure 1;

[0028] Figure 6 is a schematic diagram of the filter mechanism in Figure 1;

[0029] Figure 7 is a schematic diagram of the installation of the stainless steel wire mesh in Figure 6;

[0030] Figure 8 is a schematic diagram of the dispersion and stirring mechanism in Figure 1.

[0031] Figure label:

[0032] 100 – Dispersion and stirring mechanism; 101 – Storage tank; 1011 – Mechanical stirrer; 1012 – Liquid flow stirrer; 102 – Feed pump; 200 – Metal impurity condensation mechanism; 201 – First shell-and-tube heat exchanger; 202 – First mixing assembly; 2021 – First liquid tank; 2022 – First volumetric pump; 2023 – First heat exchange chamber; 2024 – First static mixer; 203 – Flash tank; 204 – First booster pump; 205 – Second mixing assembly; 2021 – Second liquid tank; 2022 – Second volumetric pump; 2023 – Second heat exchange chamber; 2024 – Second static mixer; 206 – Second shell-and-tube heat exchanger; 300 – Dehydration mechanism; 301 – Super gyratory tube; 302 – Second booster pump; 400 – Filtration mechanism. 401 – Horizontal spiral (or vertical spiral) sedimentation centrifuge; 402 – Intermediate tank; 403 – Third booster pump; 404 – Plate and frame pressure filter (or closed diatomaceous earth filter); 405 – Pure phenol tar output pipeline; 406 – Solid phase discharge end sealing box of horizontal spiral (or vertical spiral) sedimentation centrifuge; 407 – Plate and frame pressure filter body sealing box; 4041 – Stainless steel wire mesh; 408 – Vacuum pump.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," "third," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0036] Please refer to Figures 1 to 8. A phenol tar metal impurity removal device includes a dispersion and stirring mechanism 100, a metal impurity condensation mechanism 200, a dehydration mechanism 300, and a filtration mechanism 400.

[0037] The dispersion and stirring mechanism 100 is used to disperse and mix the moisture in the phenol tar.

[0038] The metal impurity condensation mechanism 200 is used to obtain the phenol tar output by the dispersion and stirring mechanism 100, and to heat the phenol tar to a first temperature and then mix it thoroughly with the pre-prepared first group of drug solutions. After that, some water is removed by flash evaporation and some metal impurities are periodically discharged. Then it is mixed with the pre-prepared second group of drug solutions and then heated to a second temperature so that the metal impurities in the phenol tar react with the drugs in the second group of drug solutions and condense the metal impurities into a phenol tar-containing ionized agglomerate metal impurity mixture.

[0039] The dehydration unit 300 is used to obtain the phenol tar ion-agglomerated metal impurity mixture output by the metal impurity condensation unit 200, and remove water to become a dehydrated phenol tar ion-agglomerated metal impurity mixture.

[0040] The filtration mechanism 400 is used to obtain the dehydrated phenol tar mixture with ionic agglomerates and metal impurities output by the dehydration mechanism 300, and to filter out the ionic agglomerates and metal impurities to obtain pure phenol tar.

[0041] Specifically, the phenol tar to be processed inevitably becomes contaminated with water during production and transportation. Since the density of phenol tar is similar to that of water, under normal conditions, water and phenol tar form an oil-in-water or water-in-oil emulsion. Therefore, it is difficult to separate the water by simply letting it stand. The presence of these oil-in-water or water-in-oil emulsions can affect the operating temperature.

[0042] Significant fluctuations make product quality difficult to control, thus requiring water dispersion. This application pre-stirs the phenol tar to be processed using a dispersion and stirring mechanism 100, ensuring thorough mixing of the phenol tar with its own water content. Then, a metal impurity condensation mechanism 200 reacts the solid metal impurities of the phenol tar with the first and second sets of pharmaceutical solutions to condense the solid metal impurities into a mixture of phenol tar containing ionic aggregates of metal impurities. Next, a dehydration mechanism 300 removes the water from the mixture of phenol tar containing ionic aggregates of metal impurities. Finally, a filtration mechanism 400 filters out the aggregated metal impurities from the dehydrated mixture of phenol tar containing ionic aggregates of metal impurities, yielding pure phenol tar. This phenol tar metal impurity removal device condenses metal impurities in an environment where water and phenol tar are thoroughly mixed, followed by water removal and filtration of aggregated metal impurities. The reaction environment of this phenol tar metal impurity removal device is stable and efficient.

[0043] The dispersion and stirring mechanism 100 includes a storage tank 101 and a mechanical stirrer 1011, a liquid flow stirrer 1012, and a feed pump 102. Since phenol tar is completely soluble in water above 65°C, the temperature of the storage tank 101 is controlled within the range of 65 to 80°C for stirring to disperse the accumulated water. After the water is dispersed and fully mixed with the phenol tar, it is transferred by the feed pump 102 to the feed end of the first shell-and-tube heat exchanger 201. In the subsequent reaction process between the phenol tar metal impurities and the drug, because the water and phenol tar are fully mixed, the high specific heat capacity of water will not cause a temperature depression in a local area, affecting the reaction depth. When the water evaporates, it will not take away a large amount of heat due to the large amount of water evaporating in a local area, causing uneven temperature distribution. In this way, the temperature of each part of the phenol tar can be regulated, which is conducive to the coagulation reaction of metal impurities and drugs at an ideal temperature.

[0044] It should be noted that the storage tank 101 is an atmospheric pressure vertical storage tank or an atmospheric pressure horizontal storage tank. The tank is made of metal or plastic and is equipped with a heating coil to heat the phenol tar to be treated with steam.

[0045] Furthermore, the metal impurity condensation mechanism 200 includes a first shell-and-tube heat exchanger 201, a first mixing assembly 202, a flash tank 203, a first booster pump 204, a second mixing assembly 205, and a second shell-and-tube heat exchanger 206. The inlet end of the first shell-and-tube heat exchanger 201 is connected to the outlet end of the feed pump 102. One inlet end of the first mixing assembly 202 is connected to the outlet end of the first shell-and-tube heat exchanger 201, and the other inlet end of the first mixing assembly 202 is connected to a first liquid tank 2021 to obtain a pre-prepared first set of liquids. The inlet end of the flash tank 203 is connected to the outlet end of the first mixing assembly 202, and one outlet end of the flash tank 203 is connected to the inlet end of the oil-water recovery system for discharging the flashed light component oil and water vapor. Another discharge end of the flash tank 203 is connected to the outside to periodically discharge solid metal impurities. The third discharge end of the flash tank 203 is connected to the inlet end of the first booster pump 204. One inlet end of the second mixing assembly 205 is connected to the discharge end of the first booster pump 204, and the other inlet end of the second mixing assembly 205 is connected to the second liquid tank 2051 to obtain the pre-prepared second set of liquid. The inlet end of the second shell-and-tube heat exchanger 206 is connected to the discharge end of the second mixing assembly 205, and the discharge end of the second shell-and-tube heat exchanger 206 is connected to the inlet end of the super gyratory tube 301, for outputting a mixture of phenol tar with ionic agglomerated metal impurities.

[0046] Specifically, after the phenol tar is fully mixed with its own water content, it is transferred to the first shell-and-tube heat exchanger 201. In the first shell-and-tube heat exchanger 201, it is heated for the first time with steam or other heat medium to reach a first temperature. At the first temperature, it is transferred to the first static mixer 2024, where the drug is mixed. In one embodiment, the first temperature is set to 110 to 130°C. Mixing the drug at the first temperature ensures good fluidity of both the drug solution and the phenol tar, good dispersibility of the phenol tar, and at this temperature, the drug solution will not evaporate or thermally decompose, and the reaction rate is slow, ensuring that the properties of the phenol tar and the drug solution are stable during the mixing process. This ensures the mixing effect. Moreover, the temperature range of 110 to 130°C also facilitates the vaporization and separation of water in the flash tank. After the phenol tar undergoes a first heating and mixing process, the non-ionic metallic impurities in the phenol tar are fully mixed with the first group of pharmaceutical solutions to obtain a first pharmaceutical solution phenol tar mixture. This first pharmaceutical solution phenol tar mixture is then transferred to the flash tank for dehydration and precipitation separation, with some solid metallic impurities periodically discharged to obtain a pre-purified phenol tar mixture. Subsequently, to completely remove the solid metallic impurities from the phenol tar, the pre-purified phenol tar mixture is transferred to a second static mixer for a second mixing process. This allows the metallic ions in the pre-purified phenol tar mixture to fully contact with the second group of pharmaceutical solutions, forming a second pharmaceutical solution phenol tar mixture. This mixture is then heated to 150 to 180°C with steam or other heat media to allow the pharmaceutical solution to fully react with the solid metallic ions, resulting in a phenol tar mixture containing ionic aggregates of metallic impurities. This method, through two mixing and two heating processes, improves the efficiency of mixing and reaction, resulting in higher efficiency in the coagulation of metallic impurities and a more thorough reaction. The pressure around the phenol tar in the shell-and-tube heat exchanger environment is 1 to 1.6 MPa.

[0047] Furthermore, the first mixing assembly 202 includes a first liquid tank 2021, a first volumetric pump 2022, a first heat exchange box 2023, and a first static mixer 2024. One inlet of each of the first liquid tank 2021, the first volumetric pump 2022, the first heat exchange box 2023, and the first static mixer 2024 is sequentially connected. The other inlet of the first static mixer 2024 is connected to the outlet of the first shell-and-tube heat exchanger 201. The outlet of the first static mixer 2024 is connected to the inlet of the flash tank 203. The second mixing assembly 205 includes a second liquid tank 2051, a second volumetric pump 2052, a second heat exchange box 2053, and a second static mixer 2054. These components are also connected in sequence. One of the feed ends of the second static mixer 2054 is connected in sequence, and the other feed end of the second static mixer 2054 is connected to the discharge end of the first booster pump 204. The discharge end of the second static mixer 2054 is connected to the feed end of the second shell-and-tube heat exchanger 206.

[0048] Specifically, the first batch of prepared drug solution is pressurized by the first volumetric pump 2022, and then transferred to the first heat exchange box 2023. In the first heat exchange box 2023, the first batch of drug solution is heated to 70 to 80°C with steam. Because the first batch of drug solution has much stronger fluidity than phenol tar and the amount of the first batch of drug solution is relatively small, the temperature can be adjusted through various existing methods. Then, the first batch of drug solution at the mixing temperature is transferred to the first static mixer 2024 to allow the first batch of drug solution to be fully mixed with phenol tar. This scheme can fully mix the first batch of drug solution with phenol tar to improve the mixing efficiency of the drug solution. The concentration of the first batch of drug solution is 1% to 60%, and the first batch of drug solution is pressurized to 0.5 to 5.0 MPa. Similarly, the second batch of prepared reagents is pressurized by the second volumetric pump 2052, and then transferred to the second heat exchanger 2053. In the second heat exchanger 2053, the second batch of reagents is heated to 70-80°C with steam. Because the second batch of reagents has much higher fluidity than the initially purified phenol-tar mixture, and the volume of the reagent is relatively small, the temperature can be adjusted using various existing methods. The second batch of reagents at 70-80°C is then transferred to the second static mixer 2054 to fully mix with the initially purified phenol-tar mixture. This method effectively mixes the second batch of reagents with the initially purified phenol-tar mixture, improving the mixing efficiency of the second batch of reagents. The concentration of the second batch of reagents is 1% to 60%, and all second batches of reagents are pressurized to 0.5-5.0 MPa.

[0049] Furthermore, the bending radius of the bends in the pipes of the phenol tar metal impurity removal device is 2 to 4 times the nominal diameter of the bend. The inner surfaces of the pipes, bends, and shell-and-tube heat exchangers through which the phenol tar flows are all coated with a layer of wear-resistant, corrosion-resistant, and low-friction coefficient polytetrafluoroethylene coating.

[0050] Specifically, the inner surfaces of pipes, pipe bends, and equipment through which the phenol tar flows will be corroded and eroded by the phenol tar. The asphaltene, colloids, quinoline insolubles, and other metallic impurities carried by the phenol tar will also settle in pipe bends and dead corners of equipment. Excessive settlement of metallic impurities will clog pipe bends and equipment. To solve this problem, this application sets the bending radius of the pipe bend to 2 to 4 times the nominal diameter of the bend. In addition, a layer of wear-resistant, corrosion-resistant, and low-friction coefficient polytetrafluoroethylene coating is applied to the inner surfaces of the pipes, bends, and shell-and-tube heat exchangers through which the phenol tar flows. This can ensure that the pipes, bends, and equipment do not clog or are less clogged, and do not corrode, thus ensuring long-term production of the equipment.

[0051] Furthermore, the dehydration mechanism 300 includes a super gyratory tube 301, a second booster pump 302, and an oil and water recovery system connected in series. The feed end of the super gyratory tube 301 is connected to the discharge end of the second shell-and-tube heat exchanger 206. One discharge end of the super gyratory tube 301 is connected to the feed end of the oil and water recovery system to discharge water vapor discharged from the central region of the super gyratory tube. The other discharge end of the super gyratory tube 301 is connected to the feed end of the second booster pump 302. The discharge end of the second booster pump 302 is connected to the feed end of the horizontal screw (or vertical screw) sedimentation centrifuge 401.

[0052] Specifically, solid metal impurities in phenol tar react with the drug in the first group of solutions and condense into agglomerated metal impurities. These agglomerated metal impurities are then transferred to a series-connected flash tank 203. In flash tank 203, the phenol tar agglomerated metal impurities...

[0053] The pressure of the impurity mixture suddenly decreases, causing it to rapidly boil and vaporize. Water, with a lower boiling point than phenol tar, vaporizes first. The lighter components, oil and water vapor, are discharged from the top of flash tank 203 and transferred to the oil and water recovery system. At this point, although the water content of the preliminarily purified phenol tar mixture discharged from the third outlet of flash tank 203 has been significantly reduced, it is still insufficient. It needs to undergo a second mixing, heating, and reaction to become a phenol tar mixture with ionic agglomerates and metallic impurities. This mixture is then transferred to a supercyclone tube 301 for deep dehydration. In the supercyclone tube 301, the mixture experiences a gravitational acceleration greater than a preset threshold through the inner wall region. Due to the density difference among the components in the mixture, water vapor, being less dense, is swirled to the central region of the supercyclone tube 301 and exits from the tube. The phenol tar mixture with ionic agglomerates and metallic impurities, due to its higher density, is spun into the inner region of the supercyclone tube 301 and discharged from the bottom of the supercyclone tube 301. The phenol tar mixture with ionic agglomerates and metallic impurities achieves oil-water separation, becoming a dehydrated phenol tar mixture with ionic agglomerates and metallic impurities. Then, the second booster pump 302 transfers the dehydrated phenol tar mixture with ionic agglomerates and metallic impurities to the filtration unit 400 for filtration.

[0054] In one embodiment, the phenol tar mixture with ionic agglomerates and metallic impurities enters the super gyrotube 301 at a temperature of 150 to 180°C, a pressure of 0.5 to 1.0 MPa, a fluid velocity of 1.2 to 1.8 m / s, and a gravitational acceleration greater than 500 g (preset threshold). The pressure difference between the feed end and the bottom discharge end is 0.15 to 0.35 MPa, the pressure difference between the feed end and the top discharge end is 0.15 to 0.25 MPa, and the density difference between the phenol tar mixture with ionic agglomerates and metallic impurities and water vapor is 0.2 to 0.50 g / cm³.

[0055] Furthermore, the filtration mechanism 400 includes a horizontal spiral (or vertical spiral) sedimentation centrifuge 401, an intermediate tank 402, a third booster pump 403, a plate and frame pressure filter (or a closed diatomaceous earth filter) 404, and a pure phenol tar output pipe 405 connected in series. The feed end of the horizontal spiral (or vertical spiral) sedimentation centrifuge 401 is connected to the discharge end of the second booster pump 302. The solid phase discharge end of the horizontal spiral (or vertical spiral) sedimentation centrifuge 401 is connected to the outside environment for discharging solid metal impurities. The liquid phase discharge end of the horizontal spiral (or vertical spiral) sedimentation centrifuge 401 is connected to the feed end of the intermediate tank 402. The discharge end of the intermediate tank 402 is connected to the feed end of the third booster pump 403. The discharge end is connected to the plate and frame pressure filter (or closed diatomaceous earth filter).

[0056] The feed end of 404 is connected to the discharge end of the plate and frame pressure filter (or closed diatomaceous earth filter) 404, which is connected to the pure phenol tar output pipe 405.

[0057] When the pressure difference between the feed end and the discharge end of the plate and frame pressure filter (or the closed diatomaceous earth filter) reaches the set value, the machine body is disassembled to remove solid metal impurities in front of the stainless steel wire mesh (or the pre-coated membrane of the closed diatomaceous earth filter).

[0058] Specifically, after dehydration, the phenol tar becomes a dehydrated mixture of ionic agglomerated metal impurities. In the filtration unit 400, a horizontal screw (or vertical screw) sedimentation centrifuge 401 separates the dehydrated phenol tar mixture of ionic agglomerated metal impurities. The ionic agglomerated metal impurities of the first particle size in the mixture are discharged from the solid discharge end of the horizontal screw (or vertical screw) sedimentation centrifuge 401. Immediately afterwards, a plate and frame pressure filter (or a closed diatomaceous earth filter) 404 further refines the mixture. The filter screen used in the plate and frame pressure filter is a stainless steel wire mesh with a density of 20 μm to 1. The stainless steel wire mesh, with its small pore size (μm), effectively traps the second-sized ionic agglomerated metal impurities in the dehydrated phenol tar mixture before it reaches the mesh, forming a filter cake that is easy to remove periodically. The short pores of the stainless steel wire mesh prevent the formation of a labyrinthine path, allowing fluid to pass through easily, resulting in a large flow rate. It is also rust-free and has low resistance, making it a superior filter element. In this case, the first-sized ionic agglomerated metal impurities in the dehydrated phenol tar mixture are larger than the second-sized ionic agglomerated metal impurities. Similarly, the closed-loop diatomaceous earth filter uses a diatomaceous earth layer as the filter element. Utilizing the labyrinthine path within the diatomaceous earth layer, it traps the second-sized ionic agglomerated metal impurities in the dehydrated phenol tar mixture before the pre-coating layer. The pure phenol tar is then output through the pure phenol tar output pipe 405. This method effectively filters agglomerated metal impurities in phenol tar. In one embodiment, the pressure difference of phenol tar inside the plate and frame pressure filter (or closed diatomaceous earth filter) is 0.01 MPa to 1.2 MPa, and the temperature of the phenol tar agglomerate and metal impurity mixture before the stainless steel wire mesh or pre-coating is 90°C to 135°C, so as to ensure the fluidity and filtration effect of phenol tar.

[0059] Furthermore, the filtration mechanism 400 also includes a solid discharge end sealing box 406 of the horizontal spiral (or vertical spiral) sedimentation centrifuge 401, a plate and frame pressure filter body sealing box 407, and a vacuum pump 408. The discharge end of the solid discharge end sealing box 406 of the horizontal spiral (or vertical spiral) sedimentation centrifuge and the discharge end of the body sealing box 407 of the plate and frame pressure filter are connected in parallel by a pipeline and then connected to the inlet end of the vacuum pump 408. The discharge end of the vacuum pump 408 is connected to the inlet end of the toxic and harmful gas absorption and separation unit, which is used to collect the toxic and harmful gases generated during the production process, and then transport them through the matching pipeline to the toxic and harmful gas absorption and separation unit for harmless treatment before being discharged into the atmosphere.

[0060] Specifically, in actual production, when solid metal impurities are continuously extruded from the solid discharge end of the horizontal screw (or vertical screw) sedimentation centrifuge 401, they inevitably carry toxic and harmful gases. If these gases are allowed to volatilize and disperse into the atmosphere, they will inevitably pollute personnel and the atmosphere. Therefore, a sealed box 406 must be installed at the solid discharge end of the horizontal screw (or vertical screw) sedimentation centrifuge 401 to collect the toxic and harmful gases. Then, the vacuum pump 408 is used to pump the collected toxic and harmful gases to the toxic and harmful gas absorption and separation unit for harmless treatment. Only after passing the treatment can the gases be discharged into the atmosphere. Similarly, the plate and frame pressure filter 404 has a layer of stainless steel wire mesh 4041 sandwiched between the filter plate and the filter frame. Due to the presence of this mesh, the seal between the filter plate and the filter frame cannot be completely leak-free. Therefore, during the production process, a small amount of toxic and harmful gases inevitably leaks from between the filter plate and the filter frame and escapes into the air, polluting the atmosphere. To solve this problem, this application provides a detachable sealed housing 407 at the body of the plate and frame pressure filter 404 to collect the toxic and harmful gases leaking from the body of the plate and frame pressure filter 404 during the production process. The collected toxic and harmful gases are then pumped by a vacuum pump 408 to a toxic and harmful gas absorption and separation unit for harmless treatment. Only after passing the treatment can the gases be released into the atmosphere.

[0061] Furthermore, the filter screen used in the plate and frame pressure filter 404 is a stainless steel wire mesh 4041, and the specifications of the stainless steel wire mesh are 20 μm to 1 μm.

[0062] Obviously, the embodiments described above are merely some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A phenolic tar metal impurity removal apparatus, characterized by: It includes a dispersion and stirring mechanism, a metal impurity coagulation mechanism, a dehydration mechanism, and a filtration mechanism connected in sequence; The dispersion and stirring mechanism is used to disperse and mix the moisture in the phenol tar. The metal impurity condensation mechanism is used to obtain the phenol tar output by the dispersion and stirring mechanism, and to heat the phenol tar to a first temperature and then mix it thoroughly with the pre-prepared first group of drug solutions. After that, some water is removed by flash evaporation and some metal impurities are periodically discharged. Then, it is mixed with the pre-prepared second group of drug solutions and then heated to a second temperature so that the metal impurities in the phenol tar react with the drugs in the second group of drug solutions and condense the metal impurities into a phenol tar-containing ionized agglomerate metal impurity mixture. The dehydration mechanism is used to obtain the phenol tar mixture with ionic agglomerates and metal impurities output by the metal impurity condensation mechanism, and to remove moisture. The filtration mechanism is used to obtain the dehydrated phenol tar mixture with ionic agglomerates and metal impurities output by the dehydration mechanism, and to filter out the agglomerates and metal impurities to obtain pure phenol tar.

2. A phenol tar metal impurities removal device according to claim 1, characterized in that: The dispersing and stirring mechanism includes a storage tank and a feed pump. The feed end of the storage tank is connected to an external pipeline for obtaining phenol tar containing metal impurities. The discharge end of the storage tank is connected to the feed end of the feed pump, and the discharge end of the feed pump is connected to the feed end of the metal impurity condensation mechanism.

3. A phenol tar metal impurities removal device as claimed in claim 1, wherein: The metal impurity condensation mechanism includes a first shell-and-tube heat exchanger, a first mixing assembly, a flash tank, a first booster pump, a second mixing assembly, and a second shell-and-tube heat exchanger. The feed end of the first shell-and-tube heat exchanger is connected to the discharge end of the dispersion and stirring mechanism. One feed end of the first mixing assembly is connected to the discharge end of the first shell-and-tube heat exchanger, and the other feed end of the first mixing assembly is connected to the outside to obtain a pre-prepared first set of medicine solution. The feed end of the flash tank is connected to the discharge end of the first mixing assembly. One discharge end of the flash tank is connected to the feed end of the oil-water recovery system to discharge the light component oil and water vapor generated during flashing. The other discharge end of the flash tank is connected to the outside to periodically discharge solid metal impurities. The third discharge end of the flash tank is connected to the feed end of the first booster pump. One feed end of the second mixing assembly is connected to the discharge end of the first booster pump, and the other feed end of the second mixing assembly is connected to the outside to obtain the pre-prepared second set of drug solutions. The feed end of the second shell-and-tube heat exchanger is connected to the discharge end of the second mixing assembly, and the discharge end of the second shell-and-tube heat exchanger is connected to the feed end of the dehydration mechanism, for outputting a mixture of phenol tar with ionic agglomerates and metallic impurities.

4. A phenol tar metal impurities removal device according to claim 3, characterized in that: The first mixing assembly includes a first liquid tank, a first volumetric pump, a first heat exchange box, and a first static mixer. The first liquid tank, the first volumetric pump, the first heat exchange box, and one inlet of the first static mixer are connected in sequence, and the other inlet of the first static mixer is connected to the outlet of the first shell-and-tube heat exchanger. The outlet of the first static mixer is connected to the inlet of the flash tank. The second mixing assembly includes a second liquid tank, a second volumetric pump, a second heat exchange box, and a second static mixer. The second liquid tank, the second volumetric pump, the second heat exchange box, and the second static mixer are connected in sequence, and the other inlet of the second static mixer is connected to the outlet of the first booster pump. The outlet of the second static mixer is connected to the inlet of the second shell-and-tube heat exchanger.

5. A phenol tar metal impurities removal device as claimed in claim 1, wherein: The bending radius of the pipe bend in the phenol tar metal impurity removal device is 2 to 4 times the nominal diameter of the bend; the inner surfaces of the pipes, bends, and shell-and-tube heat exchangers through which the phenol tar flows are all coated with a layer of wear-resistant, corrosion-resistant, and low-friction coefficient polytetrafluoroethylene coating.

6. A phenol tar metal impurities removal device as claimed in claim 1, wherein: The dehydration mechanism includes a super gyratory tube, a second booster pump, and an oil and water recovery system. The feed end of the super gyratory tube is connected to the discharge end of the metal impurity condensation mechanism. One discharge end of the super gyratory tube is connected to the feed end of the oil and water recovery system to discharge water vapor discharged from the central region of the super gyratory tube. The other discharge end of the super gyratory tube is connected to the feed end of the second booster pump, and the discharge end of the second booster pump is connected to the feed end of the filtration mechanism.

7. A phenol tar metal impurities removal device as claimed in claim 1, wherein: The filtration mechanism includes a horizontal or vertical spiral sedimentation centrifuge, an intermediate tank, a third booster pump, a plate and frame pressure filter or a closed diatomaceous earth filter, and a pure phenol tar output pipeline connected in series. The feed end of the horizontal or vertical spiral sedimentation centrifuge is connected to the discharge end of the dewatering mechanism. The solid phase discharge end of the horizontal or vertical spiral sedimentation centrifuge is connected to the outside environment for discharging solid metal impurities. The liquid phase discharge end of the horizontal or vertical spiral sedimentation centrifuge is connected to the feed end of the intermediate tank. The discharge end of the intermediate tank is connected to the feed end of the third booster pump. The discharge end of the third booster pump is connected to the feed end of the plate and frame pressure filter or the closed diatomaceous earth filter. The discharge end of the plate and frame pressure filter or the closed diatomaceous earth filter is connected to the pure phenol tar output pipeline. When the pressure difference between the feed end and the discharge end of the plate and frame pressure filter or the closed diatomaceous earth filter reaches the set value, the machine body is disassembled to remove solid metal impurities in front of the stainless steel wire mesh or the pre-coated membrane of the closed diatomaceous earth filter.

8. A phenol tar metal impurities removal device as claimed in claim 7, characterized in that: The filtration mechanism also includes a solid discharge end sealing box for a horizontal or vertical spiral sedimentation centrifuge, a body sealing box for a plate and frame pressure filter, and a vacuum pump. The discharge end of the solid discharge end sealing box of the horizontal or vertical spiral sedimentation centrifuge and the discharge end of the body sealing box of the plate and frame pressure filter are connected in parallel by a pipeline and then connected to the feed end of the vacuum pump. The discharge end of the vacuum pump is connected to the feed end of the toxic and harmful gas absorption and separation unit, which is used to collect the toxic and harmful gases generated during the production process and then transport them to the toxic and harmful gas absorption and separation unit for harmless treatment through the matching pipeline.

9. A phenol tar metal impurities removal device as claimed in claim 7, wherein: The filter screen used in the plate and frame pressure filter is a stainless steel wire mesh with a size of 20μm to 1μm.

10. A phenol tar metal impurities removal device as claimed in claim 1, wherein: The phenol tar metal impurity removal device is a fixed device, but it can also be made into a skid-mounted device consisting of one or more skids.

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