Phenol tar grading purification device

Abstract

The invention relates to the technical field of chemical production waste recycling, in particular to a phenol tar grading purification device which comprises a reaction kettle and an auxiliary platform, a stirring and mixing assembly is arranged at the top of the reaction kettle, and a condensation backflow assembly is arranged at the position, at the side end of the stirring and mixing assembly, of the top of the reaction kettle. The top parts of the condensation reflux assemblies are communicated with the tail gas pipe, and the first condensation unit and the second condensation unit are arranged, so that phenol steam in waste gas generated during chemical purification in the reaction kettle in the purification process of phenol tar is recycled; the first condensing unit is used for condensing and recycling standing phenol steam, the second condensing unit is used for emergency phenol steam recycling, and the first condensing unit and the second condensing unit are matched to clean scales and discharge residual phenol liquid from the scales, so that the recycling rate of the phenol steam in the tail gas is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling chemical production waste, and particularly to a device for fractionated purification of phenol tar. Background Art

[0002] The purification of phenol tar often requires prior pretreatment to remove solid impurities, followed by a vacuum distillation process to separate low-boiling components in the phenol tar, and then a chemical purification process to separate neutral oil impurities therein. After that, adsorption and decolorization are carried out to adsorb colored impurities, and finally, crystallization purification is carried out to obtain high-purity phenol, thereby achieving efficient recovery of phenol in phenol tar.

[0003] A formic acid volatilization condensation recovery device and a reaction kettle with Chinese patent application number CN202121315127.4 include a condenser, an input pipe, an output pipe, a through valve and a reflux valve. The condenser includes a housing for mounting on the gas outlet pipe of the reaction kettle and a condensing pipe provided in the housing; the condensing pipe is closely attached to the outer wall of the gas outlet pipe; one end of the condensing pipe is the water inlet end, and the other end of the condensing pipe is the water outlet end; the input pipe is communicated with the water inlet end of the condenser. However, when the device is in use, scale will adhere to the outside of the condensing pipe, resulting in a reduction in heat exchange efficiency.

[0004] During the chemical purification process of phenol tar, it is usually necessary to use a reaction kettle for chemical treatments such as alkali washing and acidification. The material of the reaction kettle is selected from enamel or stainless steel. During this process, phenol vapor and acidic waste gas will be generated. In industrial treatment, the waste gas is usually input into a condensation reflux tank together for the recovery of phenol vapor, and then the recovered phenol vapor is sent back to the reaction kettle for treatment. The process is complex. When a conventional condensation reflux device is equipped at the upper end of the reaction kettle, scale will form inside the device, and regular disassembly and cleaning are required, which affects the continuous purification of phenol tar. Moreover, when the condensation elbow of the conventional condensation reflux device is in direct contact with the waste gas and scale forms on the surface of the elbow, the cleaning is difficult. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a device for fractionated purification of phenol tar.

[0006] A device for fractionated purification of phenol tar according to the present invention includes a reaction kettle and an auxiliary platform. A stirring and mixing assembly is provided at the top of the reaction kettle, and a condensation reflux assembly is provided at the side end of the stirring and mixing assembly at the top of the reaction kettle. A plurality of the condensation reflux assemblies are provided, and the tops of the plurality of condensation reflux assemblies are communicated with a tail gas pipe; The condensation reflux assembly includes a first condensation unit and a second condensation unit. The second condensation unit is a standby emergency condensation unit. The waste gas generated during the purification process of phenol tar is assisted by the condensation reflux assembly to condense and recover phenol in the waste gas.

[0007] Preferably, the first condensation unit includes a first condensation pipe. The lower end of the first condensation pipe is communicated with the upper end of the reaction kettle, the upper end of the first condensation pipe is communicated with the second condensation unit. An elastic filter screen is arranged at the lower part inside the first condensation pipe. The cross-section of the elastic filter screen is in an inverted V shape. The first condensation pipe is provided with a plurality of slag discharge ports corresponding to the elastic filter screen. A collection ring is arranged on the outer side of the first condensation pipe corresponding to the slag discharge ports, and the collection ring is detachable.

[0008] Preferably, an anti-outflow ring is arranged on one side close to the elastic filter screen above the slag discharge port, and a convex ring is arranged on one side close to the elastic filter screen at the lower end of the slag discharge port; After the collection ring is installed, the slag discharge port of the first condensation pipe is no longer communicated with the outside.

[0009] Preferably, a cooling pipe is spirally wound around the outer side of the first condensation pipe. The cooling pipe is divided into upper and lower parts. A connector is arranged between the upper and lower parts of the cooling pipe. An elastic ball is arranged inside the connector. A limiting rod is arranged at the side end of the elastic ball. A water passage is arranged inside the connector. A limiting hole is arranged on the inner wall of the connector at the side end of the water passage. The limiting rod slides in the limiting hole, and a heat-expandable liquid is arranged in the limiting hole. An elastic ball placement groove is arranged on the inner wall of the connector at the side end of the water passage. The elastic ball is located in the elastic ball placement groove, and the elastic ball placement groove is located on the opposite side of the limiting hole.

[0010] Preferably, the second condensation unit includes a second condensation pipe. The upper end of the second condensation pipe is communicated with the tail gas pipe, the lower end of the second condensation pipe is communicated with the first condensation unit. A circular limiting groove is arranged at the lower end of the second condensation pipe. A circular shell slides up and down in the circular limiting groove. A nylon brush ring is arranged on one side close to the outside of the second condensation pipe at the lower end of the circular shell.

[0011] Preferably, a cooling inner pipe is arranged inside the circular shell. The arrangement of the cooling inner pipe in the circular shell is in an S shape. A piston ring is arranged at the upper end of the circular shell. A water inlet is arranged on the piston ring. An electric control pressure valve is arranged inside the water inlet. One end of the cooling inner pipe is communicated with the water inlet, and the other end of the cooling inner pipe passes through the piston ring. A spring is arranged between the lower end of the piston ring and the orifice of the circular limiting groove.

[0012] Preferably, a drain channel is provided at the upper part of the annular limiting groove of the second condenser tube. The drain channel is L-shaped. One end of the cooling inner tube passing through the piston ring slides in the drain channel. A drain pipe is provided outside the drain channel of the second condenser tube.

[0013] Preferably, a water inlet branch pipe is provided on the second condenser tube. The lower end of the water inlet branch pipe is communicated with the cooling pipe, and the upper end of the water inlet branch pipe is communicated with the upper part of the annular limiting groove.

[0014] Preferably, a plurality of feed ports are further provided at the top of the reaction kettle, and a discharge port is provided at the lower end of the reaction kettle. The stirring and mixing assembly includes a driving motor, a driving shaft and stirring blades. Among them, the stirring blades are located inside the reaction kettle. The driving shaft is rotationally and sealingly matched with the reaction kettle, and the driving motor provides power for the rotation of the driving shaft.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: By setting the first condensation unit and the second condensation unit, during the purification of phenol tar, the phenol vapor in the waste gas generated during chemical purification in the reaction kettle is recovered. The first condensation unit is for the regular condensation and recovery of phenol vapor, and the second condensation unit is for the standby emergency recovery of phenol vapor. When it is indirectly judged through the structure in the connector that the fouling in the first condensation unit is serious, the annular shell in the second condensation unit descends. Under the cooperation of the nylon brush ring and the elastic filter screen, the fouling in the first condenser tube is cleaned. And the cooling inner tube in the annular shell will subsequently be filled with cooling water, so that the inner wall of the annular shell replaces the inner wall of the first condenser tube for the condensation and recovery of phenol vapor. After the inner wall of the first condenser tube is cleaned, the equipment will return to the regular phenol vapor condensation and recovery posture. When the annular shell descends and cooperates with the elastic filter screen, it can also extrude the residual phenol liquid in the fouling to improve the recovery rate of phenol vapor in the tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the reaction kettle of the present invention; Figure 3 is a schematic structural diagram of the condensation and reflux assembly of the present invention; Figure 4 is the Figure 3 enlarged structural diagram of part A in the present invention; Figure 5 is the Figure 3 enlarged structural diagram of part B in the present invention; Figure 6 is the Figure 3 enlarged structural diagram of part C in the present invention; Figure 7It is a schematic internal structure diagram after the annular shell of the present invention is unfolded; Figure 8 It is a schematic structural diagram of the connector of the present invention.

[0017] Reference numerals: 1, reaction kettle; 2, auxiliary platform; 3, stirring and mixing assembly; 4, condensation and reflux assembly; 5, tail gas pipe; 6, first condensation unit; 7, second condensation unit; 8, feed inlet; 601, first condensation pipe; 602, elastic filter screen; 603, slag discharge port; 604, collection ring; 605, anti-outflow ring; 606, convex ring; 607, cooling pipe; 608, connector; 609, elastic ball; 610, limiting rod; 611, limiting hole; 701, second condensation pipe; 702, annular limiting groove; 703, annular shell; 704, nylon brush ring; 705, cooling inner pipe; 706, piston ring; 707, water inlet; 708, electric control pressure valve; 709, drainage channel; 710, drain pipe; 711, water inlet branch pipe; 712, spring. Specific embodiments

[0018] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0019] Embodiment 1 The purification of phenol tar often requires first removing solid impurities through pretreatment, and then performing the process of vacuum distillation to separate the low-boiling components in the phenol tar. After that, a chemical purification process is carried out to separate the neutral oil impurities therein. Then, adsorption and decolorization are carried out to adsorb colored impurities. Finally, crystallization purification is carried out to obtain high-purity phenol, thereby completing the efficient recovery of phenol in the phenol tar.

[0020] When carrying out the chemical purification process, a reaction kettle 1 is usually used for chemical treatments such as alkali washing and acidification. The material of the reaction kettle 1 is selected as enamel or stainless steel. During this process, phenol vapor and acidic waste gas will be generated. In industrial treatment, the waste gas is usually input into a condensation and reflux tank together to recover the phenol vapor, and then the recovered phenol vapor is sent back to the reaction kettle 1 for treatment. The process is complex. When a conventional condensation and reflux device is equipped at the upper end of the reaction kettle 1, scale will form inside the device, and regular disassembly and cleaning are required, which affects the continuous purification of phenol tar. Moreover, when the condensation elbow of the conventional condensation and reflux device is in direct contact with the waste gas and scale forms on the surface of the elbow, the cleaning is difficult.

[0021] Therefore, as Figures 1 to 8As shown in the figure, the present invention provides a device for fractional purification of phenol tar, which includes a reaction kettle 1 and an auxiliary platform 2. A stirring and mixing assembly 3 is arranged at the top of the reaction kettle 1. A condensation and reflux assembly 4 is arranged at the side end of the stirring and mixing assembly 3 at the top of the reaction kettle 1. There are multiple condensation and reflux assemblies 4, and the tops of the multiple condensation and reflux assemblies 4 are communicated with an exhaust pipe 5. On the one hand, the auxiliary platform 2 can assist in fixing the reaction kettle 1, and on the other hand, it can supply the operating workers to conveniently repair the components of the reaction kettle 1, or understand the situation inside the reaction kettle 1 through the observation window of the reaction kettle 1. Its stirring and mixing assembly 3 assists in the chemical purification inside the reaction kettle 1 to make the chemical purification proceed fully. The gas generated during the chemical purification stage inside the reaction kettle 1 passes upward through the condensation and reflux assembly 4 and enters the exhaust pipe 5. The condensation and reflux assembly 4 is used to assist in condensing and recovering the phenol vapor in the gas. The condensed and recovered phenol directly falls downward and re-enters the reaction kettle 1 for recovery, reducing the content of phenol vapor in the tail gas and reducing the amount of phenol vapor to be treated by subsequent condensation and recovery. Moreover, since there are multiple condensation and reflux assemblies 4, the recovery rate of phenol vapor is increased.

[0022] As Figure 2 shown, multiple feed ports 8 are also arranged at the top of the reaction kettle 1, and a discharge port is arranged at the lower end of the reaction kettle 1. The stirring and mixing assembly 3 includes a driving motor, a driving shaft and stirring blades. Among them, the stirring blades are located inside the reaction kettle 1, the driving shaft is rotationally and sealingly matched with the reaction kettle 1, and the driving motor provides power for the rotation of the driving shaft. Different feed ports 8 correspond to different material additions, so that different materials will not be affected by each other due to residues in the pipeline during addition. After the chemical purification in the reaction kettle 1 is completed, it is discharged through the discharge port at the lower end of the reaction kettle 1 and transported to the next process through a pipeline. Using the driving motor to provide power, the driving shaft rotates, and the rotation of the driving shaft will drive the rotation of the stirring blades inside the reaction kettle 1. The rotation of the stirring blades can ensure the full progress of the chemical purification inside the reaction kettle 1 and improve the chemical purification effect inside the reaction kettle 1.

[0023] As Figure 3 shown, the condensation and reflux assembly 4 includes a first condensation unit 6 and a second condensation unit 7. The second condensation unit 7 is a standby emergency condensation unit. The waste gas generated during the purification process of phenol tar is assisted by the condensation and reflux assembly 4 to condense and recover the phenol in the waste gas. The first condensation unit 6 is used under normal conditions. When the first condensation unit 6 has a fault or is seriously fouled, the second condensation unit 7 will be started, so that the second condensation unit 7 conducts emergency condensation and reflux of phenol vapor.

[0024] As Figure 3 and Figure 6As shown, the first condensation unit 6 includes a first condensation pipe 601. The lower end of the first condensation pipe 601 is communicated with the upper end of the reaction kettle 1. A cooling pipe 607 is spirally wound around the outside of the first condensation pipe 601. The cooling medium is sent into the cooling pipe 607 by means of pumping, so that the cooling medium flows in the cooling pipe 607. When the phenol vapor passes through the first condensation pipe 601, due to the decrease in temperature, the phenol vapor will liquefy and condense on the inner wall of the first condensation pipe 601 and flow downward, and then return to the reaction kettle 1 again. Among them, the cooling medium is water, and a scale inhibitor is added to the water to reduce the scaling in the cooling pipe 607, and the temperature at the first condensation pipe 601 is controlled to be ≤ 25 °C to ensure the full liquefaction of the phenol vapor. The spiral winding method of the cooling pipe 607 reduces the processing difficulty, is easy to implement, and avoids the scaling of impurities in the tail gas on the surface of the cooling pipe 607, which is difficult to clean up.

[0025] As Figure 6 shown, the upper end of the first condensation pipe 601 is communicated with the second condensation unit 7. An elastic filter screen 602 is arranged at the lower part inside the first condensation pipe 601. The cross section of the elastic filter screen 602 is in an inverted V shape. A plurality of slag discharge ports 603 are arranged at the corresponding position of the first condensation pipe 601 for the elastic filter screen 602. A collection ring 604 is arranged at the corresponding position of the outside of the first condensation pipe 601 for the slag discharge ports 603. The collection ring 604 is detachable. When the tail gas flows upward in the first condensation pipe 601, there will be a phenomenon that impurities adhere and condense on the inner wall of the first condensation pipe 601. When the materials in the reaction kettle 1 are added by pumping, the equipment will inevitably generate slight vibration, and the loose scale on the inner wall of the first condensation pipe 601 will fall off. To prevent the scale from falling into the reaction kettle 1, the elastic filter screen 602 is used to assist in collecting the falling scale, and by using the inclined plane, the falling scale can slide into the collection ring 604 through the slag discharge ports 603, while the condensed phenol can pass through the elastic filter screen 602 and enter the reaction kettle 1.

[0026] An anti-outflow ring 605 is arranged on one side close to the elastic filter screen 602 above the slag discharge ports 603. A convex ring 606 is arranged on one side close to the elastic filter screen 602 at the lower end of the slag discharge ports 603. When the condensed phenol liquid on the inner wall of the first condensation pipe 601 flows downward, with the assistance of the anti-outflow ring 605, it is prevented that the phenol liquid enters the collection ring 604 through the slag discharge ports 603. And when the phenol liquid falling on the elastic filter screen 602 does not have time to pass through the elastic filter screen 602, with the assistance of the convex ring 606, the amount of phenol liquid entering the slag discharge ports 603 is reduced, and the recovery rate of the phenol vapor is increased.

[0027] After the collection ring 604 is installed, the slag discharge ports 603 of the first condensation pipe 601 are no longer communicated with the outside. After the installation of the collection ring 604 is completed, the outer ends of the slag discharge ports 603 of the first condensation pipe 601 are in a closed state, preventing the gas in the first condensation pipe 601 from leaking and causing environmental pollution.

[0028] As Figure 3 and Figure 8 shown, the cooling pipe 607 is divided into upper and lower parts. A connector 608 is provided between the upper and lower parts of the cooling pipe 607. An elastic ball 609 is arranged inside the connector 608. A limiting rod 610 is arranged at the side end of the elastic ball 609. A water passing channel is arranged inside the connector 608. A limiting hole 611 is arranged at the side end of the inner wall of the connector 608 in the water passing channel. The limiting rod 610 slides in the limiting hole 611, and a heat-expandable liquid is arranged inside the limiting hole 611. An elastic ball placement groove is arranged at the side end of the inner wall of the connector 608 in the water passing channel. The elastic ball 609 is located in the elastic ball placement groove. The elastic ball placement groove is located on the opposite side of the limiting hole 611. When the inner wall of the first condensing pipe 601 is scaled and thickened, the heat diffused outward by the first condensing pipe 601 will decrease. Therefore, the water temperature in the cooling pipe 607 will drop. After the temperature drops, the heat-expandable liquid in the limiting hole 611 will cool down and its volume will decrease, causing the limiting rod 610 to move into the limiting hole 611, and then causing the elastic ball 609 to enter the water passing channel, reducing the downward flow rate of the water in the cooling pipe 607. When the pumping pressure remains unchanged, the pressure in the upper cooling pipe 607 increases, enabling the second condensing unit 7 to start.

[0029] As Figures 3 to 5 shown, the second condensing unit 7 includes a second condensing pipe 701. The upper end of the second condensing pipe 701 is connected to the tail gas pipe 5, and the lower end of the second condensing pipe 701 is connected to the first condensing unit 6. A circular limiting groove 702 is arranged at the lower end of the second condensing pipe 701. A circular shell 703 is slidably arranged up and down in the circular limiting groove 702. A nylon brush ring 704 is arranged at the side of the lower end of the circular shell 703 close to the outside of the second condensing pipe 701. The circular shell 703 can slide up and down in the circular limiting groove 702. During the sliding process, the nylon brush ring 704 can clean the inner wall structure of the first condensing pipe 601, and the inner wall structure of the circular shell 703 itself can be scraped through the mouth of the circular limiting groove 702, thereby increasing the heat exchange efficiency.

[0030] A cooling inner tube 705 is arranged inside the annular shell 703. The arrangement of the cooling inner tube 705 inside the annular shell 703 is in an S shape. A piston ring 706 is arranged at the upper end of the annular shell 703. A water inlet 707 is arranged on the piston ring 706. An electronically controlled pressure valve 708 is arranged inside the water inlet 707. One end of the cooling inner tube 705 is communicated with the water inlet 707. The other end of the cooling inner tube 705 passes through the piston ring 706. The second condenser tube 701 is provided with a drain channel 709 above the annular limiting groove 702. The drain channel 709 is in an L shape. The end of the cooling inner tube 705 passing through the piston ring 706 slides inside the drain channel 709. The second condenser tube 701 is provided with a drain pipe 710 outside the drain channel 709. The second condenser tube 701 is provided with a water inlet branch pipe 711. The lower end of the water inlet branch pipe 711 is communicated with the cooling tube 607. The upper end of the water inlet branch pipe 711 is communicated with the upper part of the annular limiting groove 702. A spring 712 is arranged between the lower end of the piston ring 706 and the mouth of the annular limiting groove 702. A limiting ring is arranged at the lower port of the piston ring 706. The spring 712 is located between the limiting ring and the piston ring 706. When the pressure in the upper part of the cooling tube 607 increases, the water flow will enter the upper end of the annular limiting groove 702 along the water inlet branch pipe 711, so that the piston ring 706 moves downward against the action of the spring 712, and the annular shell 703 moves downward. During this process, the nylon brush ring 704 cleans the scale on the inner wall of the first condenser tube 601. And when the piston ring 706 descends, the liquid in the upper part of the cooling tube 607 enters the annular limiting groove 702, so that the pressure in the upper part of the cooling tube 607 tends to be stable or rise slowly. When the piston ring 706 descends to the limit, the annular limiting groove 702 no longer plays a pressure-dividing effect, and the pressure in the upper part of the cooling tube 607 continues to rise, that is, the pressure in the annular limiting groove 702 rises. When the pressure is greater than the electronically controlled pressure valve 708, the electronically controlled pressure valve 708 opens for a set time, and the water in the annular limiting groove 702 will enter the cooling inner tube 705. At this time, the inner wall of the annular shell 703 will start to liquefy and condense the phenol vapor.

[0031] During the use of the present invention, when purifying phenol tar, at the beginning of the chemical purification stage in the reaction kettle 1, the cooling tube 607 is supplied with cooling water in a pumping manner, so that the cooling water flows in from the upper end of the cooling tube 607 and out from the lower end.

[0032] When chemical purification is carried out in the reactor 1, waste gas is generated. The waste gas enters the condensation reflux assembly 4 upward and is then guided by the tail gas pipe 5 to the subsequent process for treatment. When the waste gas passes through the condensation reflux assembly 4, the flow of cooling water in the cooling pipe 607 will reduce the temperature at the first condenser pipe 601. The phenol vapor in the waste gas will liquefy on the inner wall of the first condenser pipe 601. As the liquefied phenol accumulates on the inner wall of the first condenser pipe 601, the phenol will slide down along the inner wall of the first condenser pipe 601 and re-enter the reactor 1, thus completing the recovery and utilization of the phenol vapor and improving the chemical purification effect in the reactor 1.

[0033] When the liquid phenol on the inner wall of the first condenser pipe 601 slides down, with the assistance of the anti-outflow ring 605, it is avoided that the phenol liquid enters the collection ring 604 through the slag discharge port 603. And when the phenol liquid falling on the elastic filter screen 602 has no time to pass through the elastic filter screen 602, with the assistance of the convex ring 606, the amount of phenol liquid entering the slag discharge port 603 is reduced, increasing the recovery rate of the phenol vapor.

[0034] As the chemical purification in the reactor 1 progresses, it is inevitable that impurities in the waste gas will scale and adhere to the inner wall of the first condenser pipe 601. When the materials in the reactor 1 are added by pumping, the equipment will inevitably generate slight vibrations, and the loose scale on the inner wall of the first condenser pipe 601 will fall off. To prevent the scale from falling into the reactor 1, the elastic filter screen 602 is used to assist in collecting the fallen scale, and with the help of the inclined plane, the fallen scale can slide into the collection ring 604 through the slag discharge port 603, while the condensed phenol can pass through the elastic filter screen 602 and enter the reactor 1.

[0035] As the scale layer further thickens, the heat exchange efficiency between the first condenser pipe 601 and the cooling pipe 607 will decline. Therefore, the water temperature of the cooling water in the cooling pipe 607 will drop. After the water temperature in the cooling pipe 607 drops, the heat-expandable liquid in the limit hole 611 will cool down and its volume will decrease, causing the limit rod 610 to move into the limit hole 611, and then the elastic ball 609 enters the water passage, reducing the downward flow of water in the lower part of the cooling pipe 607. When the pumping pressure remains unchanged, the pressure in the upper part of the cooling pipe 607 increases.

[0036] After the pressure in the upper cooling pipe 607 increases, the water pressure entering the annular limiting groove 702 through the water inlet branch pipe 711 also increases. As the amount of water entering the annular limiting groove 702 increases, under the action of the water pressure, the piston ring 706 will move downward against the action of the spring 712, causing the annular shell 703 to move downward. During this process, the nylon brush ring 704 cleans the scale on the inner wall of the first condensing pipe 601. And when the piston ring 706 descends, the liquid in the upper part of the cooling pipe 607 enters the annular limiting groove 702, thereby making the pressure in the upper part of the cooling pipe 607 tend to be stable or rise slowly. When the piston ring 706 descends to the limit, the annular limiting groove 702 no longer plays a pressure-dividing effect. The scale cleaned off will fall on the elastic filter screen 602, and with the assistance of the inclined surface of the elastic filter screen 602, the scale will pass through the slag discharge port 603 and enter the collection ring 604. And when the annular shell 703 descends and contacts the elastic filter screen 602, the residual phenol liquid in the scale between the two can be extruded to improve the recovery rate of phenol vapor.

[0037] When the piston ring 706 descends to the limit, as the water continues to enter the annular limiting groove 702, the pressure in the annular limiting groove 702 will continue to rise. When the pressure is greater than the electric control pressure valve 708, the electric control pressure valve 708 opens for a set time, and the water in the annular limiting groove 702 will enter the inner cooling pipe 705, thereby reducing the water pressure in the annular limiting groove 702. At this time, the inner wall of the annular shell 703 will start to liquefy and condense the phenol vapor. And as the water pressure in the annular limiting groove 702 decreases, with the assistance of the spring 712, the piston ring 706 moves upward, causing the annular shell 703 to retract into the annular limiting groove 702. During this process, the lower port part of the annular limiting groove 702 will clean the phenol liquid and scale on the inner wall of the annular shell 703.

[0038] As the annular shell 703 rises, the thickness at the first condensing pipe 601 returns to the initial thickness, and its heat exchange efficiency will increase, causing the water temperature in the cooling pipe 607 to rise, thereby making the elastic ball 609 in the connector 608 return to the initial state, thus completing the cleaning of the scale on the inner wall of the first condensing pipe 601 and returning to the initial condensation state.

[0039] The main functions achieved by the present invention are as follows: By setting the first condensation unit 6 and the second condensation unit 7, during the purification of phenol tar, the phenol vapor in the waste gas generated during chemical purification in the reaction kettle 1 is recovered. The first condensation unit 6 is for the regular condensation and recovery of phenol vapor, and the second condensation unit 7 is for the standby emergency recovery of phenol vapor. When it is indirectly determined through the structure in the connector 608 that the fouling in the first condensation unit 6 is serious, the annular shell 703 in the second condensation unit 7 descends. With the cooperation of the nylon brush ring 704 and the elastic filter screen 602, the fouling in the first condensate pipe 601 is cleaned. And then, cooling water is introduced into the cooling inner pipe 705 in the annular shell 703, so that the inner wall of the annular shell 703 replaces the inner wall of the first condensate pipe 601 for the condensation and recovery of phenol vapor. After the cleaning of the inner wall of the first condensate pipe 601 is completed, the device returns to the regular state of phenol vapor condensation and recovery. When the annular shell 703 descends and cooperates with the elastic filter screen 602, the residual phenol liquid in the fouling can also be extruded to improve the recovery rate of phenol vapor in the tail gas.

[0040] Finally, it should be noted that the main function of the convex ring 606 is to reduce the amount of phenol liquid entering the slag discharge port 603. At the same time, there will be fouling between the convex ring 606 and the inclined surface of the elastic filter screen 602 that cannot pass through the slag discharge port 603 and enter the collection ring 604. The amount of residual fouling between the convex ring 606 and the inclined surface of the elastic filter screen 602 depends on the height of the protruding part of the convex ring 606. The higher the protruding part of the convex ring 606, the more the corresponding residual fouling. By reasonably setting the height of the protruding part of the convex ring 606, the amount of residual fouling between the convex ring 606 and the inclined surface of the elastic filter screen 602 is controlled. Therefore, the setting of the convex ring 606 has more advantages than disadvantages.

[0041] Embodiment 2 The present invention also provides a processing method for the condensation reflux assembly in the above Embodiment 1, including the following steps: Step 1: Process the slag discharge port 603 on the first condensate pipe 601, the installation groove of the elastic filter screen 602, and the buckle groove of the collection ring 604, and install a sealing gasket in the buckle groove. Install the collection ring 604 on the outside of the first condensate pipe 601 in a buckling manner to ensure the seal of the first condensate pipe 601 outside the slag discharge port 603. Then, embed the elastic filter screen 602 into the installation groove on the inner wall of the first condensate pipe 601 through elastic deformation, and then wind and install the cooling pipe 607 on the outside of the first condensate pipe 601; Step 2: Process the annular limiting groove 702 on the second condensate pipe 701, and process the insertion holes of the drainage channel 709 and the water inlet branch pipe 711. Among them, the insertion hole of the water inlet branch pipe 711 can be directly connected to the upper end of the annular limiting groove 702 in an inclined manner through drilling, while the drainage channel 709 forms an L-shaped hole through the cooperation of vertical drilling and horizontal drilling; Step 3: Place the elastic S-shaped cooling inner tube 705 into the U-shaped annular shell 703, and form the annular shell 703 into a ring sleeve shape by bending. Then, fix the piston ring 706 at the upper end of the annular shell 703 by welding, and install the nylon brush ring 704 on the outer side of the annular shell 703 in the form of patching or welding. Insert the processed annular shell 703 as a whole into the annular limiting groove 702, so that the cooling inner tube 705 is inserted into the drainage channel 709 for positioning and limiting. Finally, install the limiting ring by welding at the lower port of the annular limiting groove 702; Step 4: After the first condensation unit 6 and the second condensation unit 7 are processed, connect them by welding. Among them, the outer diameters of the first condenser tube 601 and the second condenser tube 701 are the same, and the inner diameter of the first condenser tube 601 is larger than the inner diameter of the second condenser tube 701; Step 5: Install the assembled condensation reflux assembly 4 at the corresponding position on the upper end of the reactor 1, and install the remaining components in the condensation reflux assembly 4 in the pipeline installation manner of the existing technology; Step 6: When processing the connector 608 in Step 1, the connector 608 is divided into left and right parts. After the two parts are machined, after the internal elastic ball 609 is installed, the left and right parts are connected and sealed by welding, and a heat-expandable liquid is injected into the limiting hole 611 by micro-drilling, and then sealed later.

[0042] For the phenol-tar fractional purification device of the present invention, its installation method, connection method or setting method are all common mechanical methods, and any implementation that can achieve its beneficial effects can be carried out.

[0043] All technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A phenol tar fractional purification device, comprising a reaction kettle (1) and an auxiliary platform (2), characterized in that, A stirring and mixing assembly (3) is provided at the top of the reactor (1). A condensation and reflux assembly (4) is provided at the side of the stirring and mixing assembly (3) at the top of the reactor (1). A plurality of the condensation and reflux assemblies (4) are provided, and the tops of the plurality of the condensation and reflux assemblies (4) are communicated with an exhaust pipe (5). The condensation and reflux assembly (4) includes a first condensation unit (6) and a second condensation unit (7). The second condensation unit (7) is a standby emergency condensation unit. The waste gas generated during the purification process of phenol tar is assisted by the condensation and reflux assembly (4) for the condensation and recovery of phenol in the waste gas.

2. The phenol tar fractional purification device according to claim 1, characterized in that, The first condensation unit (6) includes a first condensation pipe (601). The lower end of the first condensation pipe (601) is communicated with the upper end of the reactor (1). The upper end of the first condensation pipe (601) is communicated with the second condensation unit (7). An elastic filter screen (602) is provided at the lower part inside the first condensation pipe (601). The cross section of the elastic filter screen (602) is in an inverted V shape. A plurality of slag discharge ports (603) are provided at the corresponding position of the first condensation pipe (601) with respect to the elastic filter screen (602). A collection ring (604) is provided at the outside of the first condensation pipe (601) at the corresponding position of the slag discharge port (603). The collection ring (604) is detachable.

3. The phenol tar fractionation and purification device according to claim 2, characterized in that, An anti-outflow ring (605) is provided at one side close to the elastic filter screen (602) above the slag discharge port (603). A convex ring (606) is provided at one side close to the elastic filter screen (602) at the lower end of the slag discharge port (603). After the collection ring (604) is installed, the slag discharge port (603) of the first condensation pipe (601) is no longer communicated with the outside.

4. The phenol tar fractionation and purification device according to claim 2, characterized in that, A cooling pipe (607) is spirally wound around the outside of the first condensation pipe (601). The cooling pipe (607) is divided into upper and lower parts. A connector (608) is provided between the upper and lower parts of the cooling pipe (607). An elastic ball (609) is provided inside the connector (608). A limiting rod (610) is provided at the side end of the elastic ball (609). A water passing channel is provided inside the connector (608). A limiting hole (611) is provided at the inner wall of the connector (608) at the side end of the water passing channel. The limiting rod (610) slides in the limiting hole (611), and a heat-expandable liquid is provided inside the limiting hole (611). An elastic ball placement groove is provided at the inner wall of the connector (608) at the side end of the water passing channel. The elastic ball (609) is located in the elastic ball placement groove. The elastic ball placement groove is located on the opposite side of the limiting hole (611).

5. The phenol tar fractionation and purification device according to claim 4, characterized in that, The second condensation unit (7) includes a second condensation pipe (701). The upper end of the second condensation pipe (701) is communicated with the tail gas pipe (5), the lower end of the second condensation pipe (701) is communicated with the first condensation unit (6), a circular limiting groove (702) is arranged at the lower end of the second condensation pipe (701), a circular shell (703) is arranged to slide up and down in the circular limiting groove (702), and a nylon brush ring (704) is arranged on one side of the lower end of the circular shell (703) close to the outside of the second condensation pipe (701).

6. The phenol tar fractionation and purification device according to claim 5, wherein A cooling inner pipe (705) is arranged in the circular shell (703). The arrangement of the cooling inner pipe (705) in the circular shell (703) is in an S shape. A piston ring (706) is arranged at the upper end of the circular shell (703), a water inlet (707) is arranged on the piston ring (706), an electric control pressure valve (708) is arranged in the water inlet (707), one end of the cooling inner pipe (705) is communicated with the water inlet (707), the other end of the cooling inner pipe (705) passes through the piston ring (706), and a spring (712) is arranged between the lower end of the piston ring (706) and the mouth of the circular limiting groove (702).

7. The phenol tar fractional purification device according to claim 6, characterized in that, A drainage channel (709) is arranged at the upper part of the circular limiting groove (702) of the second condensation pipe (701). The drainage channel (709) is in an L shape. The end of the cooling inner pipe (705) passing through the piston ring (706) slides in the drainage channel (709), and a drainage pipe (710) is arranged on the outside of the second condensation pipe (701) at the drainage channel (709).

8. The phenol tar fractionation and purification device according to claim 6, characterized in that, A water inlet branch pipe (711) is arranged on the second condensation pipe (701). The lower end of the water inlet branch pipe (711) is communicated with the cooling pipe (607), and the upper end of the water inlet branch pipe (711) is communicated with the upper part of the circular limiting groove (702).

9. The phenol tar fractional purification device according to claim 1, characterized in that, A plurality of feed inlets (8) are further arranged at the top of the reaction kettle (1). The lower end of the reaction kettle (1) is provided with a discharge outlet. The stirring and mixing assembly (3) includes a driving motor, a driving shaft and stirring blades. The stirring blades are located inside the reaction kettle (1). The driving shaft is rotationally and sealingly matched with the reaction kettle (1), and the driving motor provides power for the rotation of the driving shaft.

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