Polysulfone purification production line

Abstract

The invention is applicable to the technical field of high polymer material processing, and provides a polysulfone purification production line, which comprises a pretreatment tank for pretreating a polysulfone raw material; the assembly frame is arranged on one side of the pretreatment tank, and a condenser for condensing solvent steam to extract oligomer is arranged on the assembly frame; the first container and the second container are arranged below the assembly frame and are used for containing solvent liquid for polysulfone purification in a classified manner; the grading tower is arranged on one side of the assembly frame, a treatment box is arranged at the top of the grading tower, a flocculation chamber and a pelletizing chamber which are communicated with each other are arranged on the treatment box, and a drawable baffle is arranged between the flocculation chamber and the pelletizing chamber. According to the polysulfone purification production line provided by the scheme, the problem of more polysulfone impurities is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer material processing, and particularly relates to a polysulfone purification production line. Background Art

[0002] Polysulfone polymers (such as PSU, PES, PPSU) are widely used in the fields of medicine, aerospace, membrane separation, etc. due to their high temperature resistance, high transparency and excellent mechanical properties. The synthesis of polysulfone belongs to nucleophilic substitution polycondensation reaction, and the specific steps are as follows: 1. Alkaline condition: In an alkaline environment (such as K 2 CO 3 or NaOH), the hydroxyl group (—OH) of bisphenol is deprotonated to form a phenoxide anion (—O⁻). 2. Nucleophilic attack: The phenoxide anion attacks the halogen atom (Cl or F) in the dihalosulfone, substituting the halogen and forming an ether bond (—O—). 3. Polycondensation chain growth: At the same time, hydrogen halide is released as a by-product. The polycondensation reaction is carried out under the protection of high temperature (150–250 °C) and an inert gas (such as nitrogen) to avoid oxidation. Stir continuously for several hours to dozens of hours to ensure complete reaction and the molecular chain grows to the target molecular weight. During the synthesis process of polysulfone, the heating time is long, and the high temperature will lead to large energy consumption, may cause monomer decomposition or side reactions, thus generating impurities.

[0003] For example, Chinese Patent Grant Publication No. CN117362648B discloses a method for preparing polysulfone resin by segmented polymerization, which divides the polymerization reaction into two parts: pre-polymerization reaction and polymerization reaction after desalting. The pre-polymerization reaction adopts two methods of excessive phenolic monomer and excessive halogenated monomer. The phenolic monomer and the halogenated monomer are desalted after the salt formation reaction is completed in the initial stage of polymerization, but this method still needs to be carried out at high temperature for several hours.

[0004] For example, Chinese Patent Grant Publication No. CN116535648B discloses a method for preparing polysulfone resin, which quickly removes the water generated during the polymerization process by means of stripping and entrainment of an inert protective gas, thereby avoiding the hydrolysis problem of 4,4-dichlorodiphenyl sulfone and the degradation problem of the product in the reaction system. Although the synthesis method of this invention shortens the reaction time, the temperature for carrying out the polymerization reaction is still 160~165 °C.

[0005] After synthesis, post-treatment is required, including purification and drying. The reaction solution is poured into a non-solvent (such as water or methanol) to precipitate the polymer, and after filtration, it is repeatedly washed to remove residual solvents and salts. Drying: Vacuum drying yields white or light yellow granular polysulfone resin. In the purification production process of polysulfone, there are some intractable problems that need to be solved urgently. In the synthesis process of polysulfone, oligomers are inevitably generated, and the molecular weights of these oligomers are usually ≤5000; more seriously, these oligomers will encapsulate inorganic salt impurities, and in the subsequent processing, these encapsulated inorganic salt impurities will slowly precipitate out, which will cause a series of adverse consequences. For example, in the application of membrane materials, it will cause the embrittlement of the membrane materials, greatly reducing the service life and performance of the membranes; in the spinning process, it will cause the clogging of the spinning filter head, seriously affecting the continuity of spinning and the product quality. Summary of the Invention

[0006] The present invention provides a polysulfone purification production line, aiming to solve the problems of long synthesis reaction time of polysulfone and many impurities caused by high temperature.

[0007] To solve the above problems, the present invention is implemented as follows. A polysulfone purification production line includes: a pretreatment tank for pretreating polysulfone raw materials; an assembly rack provided on one side of the pretreatment tank, with a condenser provided on the assembly rack; a guiding mechanism assembled between the pretreatment tank and the condenser for guiding the solvent vapor discharged from the pretreatment tank into the condenser; a first container and a second container respectively communicated with the condenser and provided below the assembly rack; a fractionation tower provided on one side of the assembly rack, with a treatment box provided at the top of the fractionation tower. The treatment box includes a flocculation chamber and a pelletizing chamber that communicate with each other up and down. The flocculation chamber is communicated with the condenser, and a pull-out baffle is provided between the flocculation chamber and the pelletizing chamber; a flocculation mechanism provided in the flocculation chamber for treating oligomer flocs; a pelletizing mechanism provided in the pelletizing chamber for pelletizing the flocculated oligomers.

[0008] Preferably, the pretreatment tank comprises a tank body; an outer pipe vertically and fixedly connected to the center of the inner bottom of the tank body; an inner pipe concentrically arranged inside the outer pipe, with a mixing space left between the inner pipe and the outer pipe; spray nozzles spaced axially along the surface of the inner pipe; a driving mechanism installed at the center of the outer bottom of the tank body and drivingly connected to the inner pipe; a valve opened on one side of the bottom of the outer pipe; a first main pipe communicating between the side wall of the tank body and the outer pipe and inclined downward; a first branch pipe branching out from the middle of the first main pipe and communicating with the outer pipe below the first main pipe; a second main pipe symmetrically distributed with respect to the outer pipe with the first main pipe; a second branch pipe symmetrically distributed with respect to the outer pipe with the first branch pipe; a microwave generator installed in the middle of the inner wall of the tank body and its antenna aligned with the area where the first main pipe, the first branch pipe, the second main pipe and the second branch pipe are located on the outer pipe.

[0009] Preferably, the guiding mechanism comprises: a first air duct fixedly connected to the air inlet end of the condenser; a second air duct and a third air duct connected to the first air duct through a three-way joint, the air inlet ends of the second air duct and the third air duct are respectively connected to the first container and the second container; a return pipe and a fourth air duct connected to the liquid outlet end of the condenser through a three-way joint, the liquid outlet end of the return pipe extends into the second container, and the liquid outlet end of the fourth air duct extends into the flocculation chamber.

[0010] Preferably, the flocculation mechanism comprises: a first stirring rod rotatably installed on the processing box through a sealing bearing for flocculation, one end of the first stirring rod extends into the flocculation chamber; a first mounting shell fixedly installed on the processing box; a first speed regulator and a motor arranged in the first mounting shell, the output shaft of the motor is fixedly connected to the input shaft of the first speed regulator through a coupling, and the output shaft of the first speed regulating mechanism is fixedly connected to the first stirring rod through a coupling.

[0011] Preferably, the pelletizing mechanism includes: a round hole plate fixedly installed at the discharge end of the pelletizing chamber, with discharge holes formed on the round hole plate; an adjusting pressing plate arranged in the pelletizing chamber; a second hydraulic cylinder fixedly installed on the outer wall of one end of the pelletizing chamber opposite to the round hole plate through a mounting frame, the output rod of the second hydraulic cylinder extending into the pelletizing chamber and fixedly connected to the pressing plate; a guiding shell fixedly connected to the discharge end of the pelletizing chamber, with a feeding pipe communicating with the classification tower arranged on the guiding shell, and a first material valve arranged on the feeding pipe; a pelletizing knife arranged in the guiding shell and close to the round hole plate, a rotating rod fixedly installed on the pelletizing knife, and the rotating rod rotatably connected to the guiding shell through a bearing; a transition shell fixedly connected between the guiding shell and the first installation shell, a second speed regulator fixedly installed in the transition shell, the input shaft of the second speed regulator extending into the first installation shell and being driven by the output shaft of the motor through mutually meshing first bevel gears; and mutually meshing second bevel gears respectively fixedly installed on the output shaft of the second speed regulator and the rotating rod.

[0012] Preferably, a bracket is fixedly installed on the treatment box, and a first hydraulic cylinder is fixedly installed on the bracket. The output rod of the first hydraulic cylinder is fixedly connected to the baffle through a connecting plate.

[0013] Preferably, a first heating plate and an ultrasonic transducer are arranged in the pretreatment tank, and the first heating plate is used for heating the polysulfone raw material.

[0014] Preferably, second heating plates for heating the raw material liquid are arranged in both the first container and the second container. A plurality of chambers for distillation are arranged in the classification tower, and the plurality of chambers are communicated through a material pipe equipped with an electromagnetic material valve. Moreover, a third heating plate for distillation heating is arranged in the chamber.

[0015] Preferably, the same first feeding pipe is arranged between the chambers, a shunt pipe is fixedly communicated with the first feeding pipe, and a solenoid valve is arranged on the shunt pipe.

[0016] Preferably, a fifth air duct for guiding steam is communicated between the chamber and the first air duct.

[0017] Preferably, a pump body is assembled on the pretreatment tank through a connecting pipe. The discharge end of the pump body is communicated with the first container through a pipeline for conveying the treated polysulfone raw material, and a check valve is arranged on the pipeline; the bottom of the classification tower is fixedly communicated with a discharge pipe for discharging the purified polysulfone material, and a valve is arranged on the discharge pipe.

[0018] Compared with the related art, the polysulfone purification production line provided by the present invention has the following beneficial effects: Compared with the prior art, the polysulfone purification production line provided by the present solution effectively reduces the oligomer content in polysulfone and improves the purity by utilizing the linkage between the first container, the second container and the condensing device and combining the reflux pipe circulation extraction; by controlling the gradient addition rate of the precipitant in the classification tower and the linkage with the temperature, a narrow distribution product with a low molecular weight distribution coefficient is produced, and the precipitant can be accurately added through the first feeding pipe and the diversion pipe to obtain the graded product and realize precise classification; the first heating plate and the ultrasonic transducer of the pretreatment tank cooperate with the temperature controller and the ultrasonic generator to improve the pretreatment effect; the condenser, the first container, the second container, the classification tower, the treatment box and other components and their internal devices work closely together to ensure stable and efficient operation of the entire process and produce high-quality polysulfone products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a polysulfone purification production line provided by the present invention; Figure 2 It is a schematic diagram of the main cross-sectional structure of a polysulfone purification production line provided by the present invention; Figure 3 for Figure 2 An enlarged structural diagram of part A shown in FIG. Figure 4 for Figure 2 An enlarged schematic diagram of the structure of part B shown in FIG. Figure 5 for Figure 2 An enlarged schematic diagram of the structure of part C shown in FIG. Figure 6 for Figure 2 An enlarged structural diagram of part D shown in FIG. Figure 7 for Figure 2 An enlarged structural diagram of part E shown in FIG. Figure 8 for Figure 2 An enlarged structural diagram of part F shown in FIG. Figure 9 It is a schematic diagram of the structure of the bracket in the present invention; Figure 10 It is a structural schematic diagram of the assembly rack in the present invention; Figure 11 is a schematic diagram of the interior of a pretreatment tank of the present invention; Reference Numerals: 1, pretreatment tank; 2, assembly rack; 3, first container; 4, second container; 5, condenser; 6, treatment box; 7, fractionating tower; 8, outer pipeline; 9, microwave generator; 10, pump body; 11, second heating plate; 12, first air duct; 13, second air duct; 14, third air duct; 15, reflux pipe; 16, fourth air duct; 17, first stirring rod; 18, first speed regulator; 19, first mounting shell; 20, motor; 21, baffle; 22, connecting plate; 23, bracket; 24, first hydraulic cylinder; 25, round hole plate; 26, pressing plate; 27, second hydraulic cylinder; 28, pelletizing knife; 29, second speed regulator; 30, first bevel gear; 31, second bevel gear; 32, feeding shell; 33, blanking pipe; 34, first material valve; 35, fifth air duct; 36, discharge pipe; 37, first feeding pipe; 38, shunt pipe; 39, solenoid valve; 40, third heating plate; 41, second stirring rod; 42, second mounting shell; 43, transmission rod; 44, third bevel gear; 45, rotating rod, 46, inner pipeline, 47, nozzle, 48, driving mechanism, 49, valve, 50, first main pipe, 51, first branch pipe, 52, second main pipe, 53, second branch pipe. Detailed Embodiment

[0020] As used herein, the mention of "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0021] An embodiment of the present invention provides a polysulfone purification production line, as Figure 1-10 shown, the polysulfone purification production line includes: a pretreatment tank 1 for pretreating polysulfone raw materials; an assembly rack 2 disposed on one side of the pretreatment tank 1, and a condenser 5 is disposed on the assembly rack 2; a guiding mechanism assembled between the pretreatment tank and the condenser 5 for guiding the solvent vapor discharged from the pretreatment tank into the condenser; a first container 3 and a second container 4 respectively communicated with the condenser and disposed below the assembly rack 2; a fractionating tower 7 disposed on one side of the assembly rack 2, a treatment box 6 is disposed at the top of the fractionating tower 7, the treatment box 6 includes a flocculation chamber and a pelletizing chamber that communicate up and down, the flocculation chamber is communicated with the condenser, and a drawable baffle 21 is disposed between the flocculation chamber and the pelletizing chamber; a flocculation mechanism disposed in the flocculation chamber for treating the oligomer flocs; a pelletizing mechanism disposed in the pelletizing chamber for pelletizing the flocculated oligomers.

[0022] In this embodiment, in the pretreatment tank 1, the polysulfone raw material is pretreated; the solvent and steam generated by the pretreatment tank 1 enter the condenser 5 through the guiding mechanism on the assembly rack 2 for condensation treatment to extract oligomers. The condensed solvent liquid is classified and stored in the first container 3 and the second container 4 to realize the cyclic extraction of oligomers by the solvent steam. In the fractionation tower 7, a precipitant (such as acetone / methanol) is added in batches and gradients, and the polysulfone is fractionally precipitated through the molecular weight difference. In the flocculation chamber of the treatment tank 6, a flocculant (water / NMP mixture) is added through the adding pipe at the top, and the morphology of the precipitated polymer is controlled by stirring. Then, the drawable baffle 21 between the flocculation chamber and the granulation chamber is opened, and the polymer is transferred to the granulation chamber for granulation treatment; the entire polysulfone purification production line operates continuously according to the full process of pretreatment → purification → fractionation → drying; the oligomer treatment effect is good: a double-container (the first container 3 contains the polymer, and before the polymer is transported to the first container 3, the same solvent as in the pretreatment stage (i.e., ethanol) is injected into the first container 3 in advance through the feeding equipment and the feeding pipe, which is beneficial to the subsequent purification process. Ethanol can dissolve part of the oligomers or other impurities, thus helping them to separate from the polymer during the condensation process; ethanol is easy to volatilize and is convenient to remove in the subsequent drying process without leaving residues that are difficult to remove. The second container 4 contains a cyclic ether solvent such as crown ether) is linked with the condensation device, and combined with the solvent reflux extraction and the induction precipitation of the flocculant, the residual amount of oligomers can be effectively reduced, and the residual amount of oligomers is ≤0.5 wt%; the molecular weight fractionation control is accurate: through the linkage adjustment of the gradient addition rate of the precipitant and the temperature, a narrow-distribution product with a molecular weight distribution coefficient (PDI) ≤1.5 can be produced, realizing accurate molecular weight fractionation control; through the design of continuous operation of the full process, the single-line production capacity is increased by 300% compared with before, improving the production efficiency; the pretreatment tank 1 provides the preliminarily treated raw material for the entire purification process; the condenser 5, the first container 3 and the second container 4 on the assembly rack 2 cooperate to realize the cyclic extraction of oligomers by the solvent steam; the fractionation tower 7 and the treatment tank 6 cooperate to realize the fractional precipitation and particle forming of polysulfone by adding the precipitant and the flocculant; and the guiding mechanism arranged on the condenser 5, the flocculation mechanism on the treatment tank 6 and the granulation mechanism in the granulation chamber play roles in the solvent steam guiding, the oligomer flocculation treatment and the granulation treatment respectively, and all parts cooperate closely to jointly realize the high-efficiency purification, accurate fractionation and continuous production of polysulfone.

[0023] A preferred embodiment of the present invention is as Figure 11As shown, the pretreatment tank includes a tank body; an outer pipe 8 vertically fixed to the center of the inner bottom of the tank body; an inner pipe 46 concentrically arranged in the outer pipe, and a mixing space is left between the inner pipe and the outer pipe; a nozzle 47, which is distributed at intervals along the axial direction on the surface of the inner pipe; a driving mechanism 48, which is installed in the center of the outer bottom of the tank body and is transmission-connected to the inner pipe, and the driving mechanism can be a motor; a valve 49, which is opened on one side of the bottom of the outer pipe; a first main pipe 50, which is connected between the side wall of the tank body and the outer pipe and is inclined downward; a first branch pipe 51, which is branched from the middle part of the first main pipe and connected to the inner pipe located at The outer pipeline below the first main pipe is connected; the second main pipe 52, the second main pipe and the first main pipe are symmetrically distributed with respect to the outer pipeline; the second branch pipe 53, the second branch pipe and the first branch pipe are symmetrically distributed with respect to the outer pipeline; of course, there can be more branch pipes such as the third branch pipe and the fourth branch pipe, the area where the first main pipe and the second main pipe are connected with the outer pipeline corresponds to the height of one of the nozzles of the inner pipeline, the area where the first branch pipe and the second branch pipe are connected with the outer pipeline corresponds to the height of one of the nozzles of the inner pipeline, and the microwave generator 9, the microwave generator is installed in the middle of the inner wall of the tank body and its antenna is aimed at the area where the first main pipe, the first branch pipe, the second main pipe and the second branch pipe are located on the outer pipeline.

[0024] When in use, inject polar solvent (such as DMSO) and catalyst (such as K 2 CO 3 ), accurately measured bisphenol monomers such as bisphenol A are injected into the first trunk, and accurately measured dihalosulfone monomers such as DCDPS are injected into the second trunk, and then the driving mechanism is started to drive the inner pipeline to rotate. The bisphenol monomers are divided into two streams through the first branch pipe, and the same dihalosulfone monomers are divided into two streams through the second branch pipe. The two streams of bisphenol monomers and dihalosulfone monomers are mixed in the mixing space, which greatly increases the contact area. At the same time, they are mixed with the polar solvent and catalyst sprayed from the nozzle to ensure homogenization. The microwave generator emits microwaves to directly act on the polar solvent, and the reaction rate is increased by more than 10 times, which greatly shortens the reaction time. It only takes 10min-30min, and the temperature is also reduced to 80℃-120℃, thereby reducing energy consumption. It also eliminates impurities generated by long-term high-temperature heating, reducing the burden for subsequent purification. After the reaction is completed, the valve is opened, the solution enters the tank, and is finally pumped into the first container by the pump body.

[0025] In a further preferred embodiment of the present invention, the guiding mechanism includes: a first gas duct 12 fixedly connected to the intake end of the condenser 5; a second gas duct 13 and a third gas duct 14 connected to the first gas duct 12 through a three-way joint, the intake ends of the second gas duct 13 and the third gas duct 14 being respectively connected to the first container 3 and the second container 4; a return duct 15 and a fourth gas duct 16 connected to the liquid outlet end of the condenser 5 through a three-way joint, the liquid outlet end of the return duct 15 extending into the second container 4, and the liquid outlet end of the fourth gas duct 16 extending into the flocculation chamber.

[0026] In this embodiment, the solvent in the first container 3 and the second container 4 is heated to generate steam, which enters through the first gas duct 12 fixedly connected to the intake end of the condenser 5. With the help of the three-way joint, the steam is respectively introduced through the second gas duct 13 and the third gas duct 14, so that the second gas duct 13 is connected to the first container 3 and the third gas duct 14 is connected to the second container 4, and then the steam is smoothly introduced into the condenser 5 for condensation treatment; After the condenser 5 condenses the steam, the return duct 15 and the fourth gas duct 16 connected to the liquid outlet end of the condenser 5 through the three-way joint start to function. The valve on the return duct 15 is opened, and the liquid outlet end of the return duct 15 extends into the second container 4 to return the condensed and mixed solution to the second container 4, where it is continuously heated and circulated for extraction four times; after four cycles of extraction are completed, the corresponding valve is opened, and the solution is introduced into the flocculation chamber through the fourth gas duct 16 for flocculation processing.

[0027] By introducing the steam generated by heating the solvent into the condenser 5 for condensation, and making the condensed and mixed solution return to the second container 4 through the return duct 15 for four cycles of heating and extraction, the oligomer removal rate is ≥92%, effectively reducing the content of oligomers in polysulfone and improving the purity of polysulfone; the guiding mechanism plays a key connecting role in the polysulfone purification production line. It is connected to the first container 3 and the second container 4, and timely introduces the steam generated by heating the solvent in the containers into the condenser 5 to ensure the start of the oligomer extraction process; it cooperates with the condenser 5 to achieve the condensation of steam and the reasonable distribution of the condensate, and improves the oligomer removal effect through the cyclic return of the return duct 15; and it is connected to the flocculation chamber of the treatment tank 6 through the fourth gas duct 16 to smoothly introduce the solution after oligomer extraction into the next treatment link, and cooperate with other parts of the production line to jointly ensure the efficient and stable operation of the polysulfone purification production line from raw material treatment to final product shaping.

[0028] In a further preferred embodiment of the present invention, the massing mechanism includes: a first stirring rod 17 rotatably mounted on the treatment tank 6 through a sealed bearing for massing, with one end of the first stirring rod 17 extending into the massing chamber; a first mounting shell 19 fixedly mounted on the treatment tank 6; a first speed regulator 18 and a motor 20 disposed in the first mounting shell 19, an output shaft of the motor 20 being fixedly connected to an input shaft of the first speed regulator 18 through a coupling, and an output shaft of the first speed regulating mechanism 18 being fixedly connected to the first stirring rod 17 through a coupling.

[0029] In this embodiment, the motor 20 installed in the first mounting shell 19 fixedly mounted on the treatment tank 6 is turned on. The output shaft of the motor 20 drives the input shaft of the first speed regulator 18 to rotate through a coupling. The output shaft of the first speed regulator 18 is fixedly connected to the first stirring rod 17 through a coupling, thereby driving the first stirring rod 17 rotatably mounted on the treatment tank 6 through a sealed bearing to rotate. One end of the first stirring rod 17 extends into the massing chamber to perform a massing operation on the substances entering the massing chamber. The setting of the first speed regulator 18 enables the operator to adjust the rotation speed of the first stirring rod 17 according to actual needs, thereby precisely controlling the massing process and meeting the requirements of different polysulfone products for the polymer form (such as dough-like), which helps to produce products with stable quality and meeting the standards. The motor 20 is connected to the first speed regulator 18 and the first stirring rod 17 in sequence through couplings. This connection method transmits power stably, and the use of a sealed bearing ensures the smoothness and sealing of the rotation of the first stirring rod 17, reducing the interference of external factors on the massing operation and ensuring the stable and reliable operation of the massing mechanism.

[0030] The massing mechanism is an indispensable part of the polysulfone purification production line. It closely cooperates with other links of the entire production line. After polysulfone undergoes processes such as pretreatment, purification, and grading, when the solution containing the polymer is introduced into the massing chamber of the treatment tank 6, the massing mechanism starts to function. Through the stirring and massing operation of the first stirring rod 17, the polymer is processed into a suitable form, preparing for the particle forming of the subsequent granulating mechanism, and jointly completing the transformation from raw materials to the final product with other parts of the production line, ensuring that the entire polysulfone purification production line can operate efficiently and orderly and produce polysulfone products meeting the quality requirements.

[0031] In a further preferred embodiment of the present invention, the pelletizing mechanism includes: a round hole plate 25 fixedly installed at the discharge end of the pelletizing chamber, with discharge holes formed on the round hole plate; an adjusting pressure plate 26 disposed in the pelletizing chamber; a second hydraulic cylinder 27 fixedly installed on the outer wall of the pelletizing chamber at the end opposite to the round hole plate through a mounting frame, the output rod of the second hydraulic cylinder 27 extending into the pelletizing chamber and fixedly connected to the pressure plate 26; a conveying shell 32 fixedly connected to the discharge end of the pelletizing chamber, a feeding pipe 33 communicating with the classification tower 7 being provided on the conveying shell 32, and a first material valve 34 being provided on the feeding pipe 33; a pelletizing knife 28 disposed in the conveying shell and close to the round hole plate, a rotating rod 45 being fixedly installed on the pelletizing knife 28, and the rotating rod 45 being rotatably connected to the conveying shell through a bearing; a transition shell fixedly connected between the conveying shell and the first installation shell, a second speed regulator 29 fixedly installed in the transition shell, the input shaft of the second speed regulator 29 extending into the first installation shell and being driven by the output shaft of the motor 20 through mutually meshing first bevel gears 30; and second bevel gears 31 respectively fixedly installed on the output shaft of the second speed regulator 29 and the rotating rod 45 and meshing with each other.

[0032] In this embodiment, the working process of the pelletizing mechanism is as follows: First, the pressure plate 26 is pushed to move in the pelletizing chamber by the second hydraulic cylinder 27, so that the agglomerated polymer can be pushed to fit with the round hole plate 25, and the agglomerated polymer is extruded through the holes on the round hole plate 25. The motor 20 is started, and its output shaft drives the second speed regulator 29 through the first bevel gear 30. The output shaft of the second speed regulator 29 then drives the rotating rod 45 to rotate through the second bevel gear 31, thereby driving the pelletizing knife 28 to cut the agglomerated polymer extruded from the holes. The cut particles fall into the conveying shell 32. By opening the first material valve 34, the particles enter the classification tower 7 through the feeding pipe 33 for further processing. Through the design of the second hydraulic cylinder 27 and the movable and adjustable pressure plate 26 of the present invention, the flexible adjustment of the size of the cut particles is realized, and the adaptability and flexibility of the equipment are enhanced. In addition, the combination of the motor 20, the second speed regulator 29 and the bevel gear transmission ensures the stable and efficient rotation of the pelletizing knife 28, improves the cutting efficiency and the uniformity of the particles; the design of the conveying shell 32 and the feeding pipe 33, combined with the use of the first material valve 34, not only effectively guides the cut particles into the classification tower 7, but also facilitates the control of the conveying speed and flow rate of the particles, ensuring the smoothness and high efficiency of the entire production line. At the same time, this structural design is also convenient for maintenance and cleaning, reducing the production cost and downtime.

[0033] In a further preferred embodiment of the present invention, a bracket 23 is fixedly installed on the treatment box 6, and a first hydraulic cylinder 24 is fixedly installed on the bracket 23. The output rod of the first hydraulic cylinder 24 is fixedly connected to the baffle 21 through a connecting plate 22.

[0034] In this embodiment, the bracket 23 fixedly installed on the processing box 6 provides support for the first hydraulic cylinder 24. The first hydraulic cylinder 24 is installed on the bracket 23, and its output rod is fixedly connected to the baffle 21 through the connecting plate 22, being in the initial state waiting for work.

[0035] When the polymer and the mass in the flocculation chamber are completed, start the first hydraulic cylinder 24. The output rod of the first hydraulic cylinder 24 extends, drives the baffle 21 to move through the connecting plate 22, thereby opening the baffle 21, enabling the mass polymer to fall from the flocculation chamber into the pelletizing chamber, waiting for subsequent pushing and pelletizing operations; precisely control the material transfer: Through the precise control of the first hydraulic cylinder 24, the baffle 21 can be opened at the exact moment when the polymer and the mass are completed, realizing the precise transfer of the mass polymer from the flocculation chamber to the pelletizing chamber, ensuring the coherence and accuracy of the production process, and avoiding the adverse effects on production caused by premature or late material transfer; the bracket 23 provides a stable support structure for the first hydraulic cylinder 24, ensuring the stability of the first hydraulic cylinder 24 during the working process. The fixed connection method of the first hydraulic cylinder 24 and the baffle 21 through the connecting plate 22 makes the power transmission stable and reliable, ensuring that the baffle 21 can be opened and closed according to the expected action, and improving the reliability of the entire device.

[0036] In a further preferred embodiment of the present invention, second heating plates 11 for heating the raw material liquid by raising the temperature are provided in both the first container 3 and the second container 4. A plurality of chambers for distillation are provided in the fractionating tower 7, and the plurality of chambers are communicated through a material pipe equipped with an electromagnetic material valve, and a third heating plate 40 for distillation heating is provided in the chamber.

[0037] In this embodiment, when it is necessary to heat the raw material liquid in the first container 3 and the second container 4 by raising the temperature, turn on the second heating plate 11 provided in the container. The second heating plate 11 starts to work and heats the raw material liquid to make the raw material liquid reach a suitable temperature to meet the subsequent processing requirements; the plurality of chambers in the fractionating tower 7 are communicated through a material pipe equipped with an electromagnetic material valve. First, according to the distillation requirements, use the third heating plate 40 to heat each chamber to make the materials in the chambers reach the corresponding distillation temperature. Then, by controlling the opening and closing of the electromagnetic material valve, the transfer of materials between different chambers is realized to complete the fractional distillation operation; The first container 3 and the second heating plate 11 in the second container 4 can accurately heat up the raw material liquid, ensuring that the raw material liquid is in a suitable temperature state, which is beneficial to improving the extraction efficiency of the solvent for the oligomer, and further enhancing the purification effect of the polysulfone; the arrangement of multiple chambers with the third heating plate 40 and the electromagnetic material valve in the fractionation tower 7 enables the fractionation tower to achieve multi-stage precipitation integrated distillation. By controlling the temperature of different chambers and the transfer of materials, when adding the precipitant in batches and gradients, the polysulfone can be more effectively fractionated and precipitated according to the molecular weight difference, improving the accuracy and efficiency of fractionation.

[0038] In a further preferred embodiment of the present invention, the same first feeding pipe 37 is provided between the chambers, a shunt pipe 38 is fixedly connected to the first feeding pipe 37, and a solenoid valve 39 is provided on the shunt pipe 38.

[0039] In this embodiment, when the chambers in the fractionation tower 7 need to add the precipitant, the solenoid valve 39 is opened according to actual requirements. The precipitant flows in through the first feeding pipe 37, and after being shunted by the shunt pipe 38, it is injected into each chamber, thereby realizing the operation of adding the precipitant into the chamber to carry out the fractionation and precipitation process of the polysulfone; Through the first feeding pipe 37 and the shunt pipe 38 with the solenoid valve 39, the timing and flow rate of adding the precipitant to different chambers can be flexibly controlled. The appropriate amount of precipitant can be accurately added according to the specific conditions of each chamber in the fractionation tower 7, which helps to more accurately achieve the fractionation and precipitation of the polysulfone and improve the fractionation effect; through this feeding method, the addition of the precipitant can be effectively controlled, so as to obtain a fractionated product with PDI = 1.2 - 1.8, meeting the specific requirements for the molecular weight distribution of the polysulfone product and providing a guarantee for the subsequent production of high-quality polysulfone products.

[0040] In a further preferred embodiment of the present invention, a fifth air duct 35 for guiding steam is connected between the chamber and the first air duct 12.

[0041] In this embodiment, during the distillation heating process of each chamber in the fractionation tower 7, steam is generated in the chamber. These steams start to be guided through the fifth air duct 35 of each chamber; the fifth air duct 35 guides the steam generated in the chamber of the fractionation tower 7 to the connection with the first air duct 12, so that the steam converges into the first air duct 12 and enters the subsequent process together with the steam in the first air duct 12, such as entering the condenser 5 for condensation treatment.

[0042] The steam generated in the chamber of the classification tower 7 is connected to the first air duct 12 through the fifth air duct 35, realizing the integration of steam resources. This enables the originally scattered steam to be centrally processed, improving the utilization efficiency of steam and avoiding waste of steam resources; this connection method optimizes the process coherence of the entire polysulfone purification production line. The smooth flow of steam between different devices and links enables better connection of multiple links from raw material pretreatment to classification, ensuring the stable and efficient operation of the production process.

[0043] In a further preferred embodiment of the present invention, a pump body 10 is assembled on the pretreatment tank 1 through a connecting pipe. The discharge end of the pump body 10 is connected to the first container 3 through a pipeline for transporting the treated polysulfone raw material, and a check valve is provided on the pipeline; the bottom of the classification tower 7 is fixedly connected with a discharge pipe 36 for discharging the purified polysulfone material, and a valve is provided on the discharge pipe.

[0044] In this embodiment, when the polysulfone raw material in the pretreatment tank 1 is completed with pretreatment, the pump body 10 is started. The pump body 10 sucks the treated polysulfone raw material from the pretreatment tank 1 through the connecting pipe and transports it to the first container 3 through the pipeline. During this process, the check valve on the pipeline prevents the polysulfone raw material from flowing back into the pretreatment tank 1.

[0045] After the classification tower 7 completes the purification and classification of polysulfone, the valve on the discharge pipe 36 is opened, and the purified polysulfone material is discharged from the bottom of the classification tower 7 through the discharge pipe 36 for subsequent processing or storage operations; the pump body 10 can efficiently transport the pretreated polysulfone raw material to the first container 3, ensuring the continuity of raw material supply in the production process. The setting of the check valve prevents the backflow of raw materials, avoiding contamination or influence on the raw materials in the pretreatment tank 1, and ensuring the stability and safety of the entire production process; the setting of the discharge pipe 36 and the valve at the bottom of the classification tower 7 enables the purified polysulfone material to be discharged conveniently and controllably. The operator can open the valve for discharging in a timely manner according to the actual production needs, facilitating the further processing of the purified polysulfone material and improving the flexibility and efficiency of production.

[0046] In order to further improve the use effect of this device, in addition to the above-mentioned solutions, this solution also has the following embodiments: In another embodiment of the present invention, a second stirring rod 41 is rotatably installed in the chamber through a sealed bearing; a second installation shell 42 is fixedly installed on one side of the classification tower 7, and a transmission rod 43 is rotatably installed in the second installation shell 42 through a bearing seat. The output shaft of the transmission rod 43 is fixedly connected to the output shaft of the second speed regulator 29 through a coupling; third bevel gears 44 that are fixedly installed on the transmission rod 43 and the second stirring rod 41 and mesh with each other.

[0047] In this embodiment, the second stirring rod 41 rotates in the chamber, which can fully stir the materials in the chamber of the fractionation tower 7, making the precipitant and the polysulfone raw material more evenly mixed. This helps to more accurately achieve the fractional precipitation of polysulfone according to the molecular weight difference, improve the accuracy and effect of fractionation, and thus improve the quality of the polysulfone product; Through the transmission structure composed of the second mounting shell 42, the transmission rod 43, the second speed regulator 29 and the meshing third bevel gears 44, the power can be stably transmitted to the second stirring rod 41. This structural design enables the rotation speed of the second stirring rod 41 to be flexibly adjusted by the second speed regulator 29 to adapt to different production requirements, while ensuring the stable and reliable operation of the entire stirring process.

[0048] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict, make combinations, additions, deletions or other adjustments to the features in the embodiments of the present invention according to the situation without making creative efforts, so as to obtain different technical solutions that are essentially not divorced from the concept of the present invention, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A polysulfone purification production line, characterized in that: include: A pretreatment tank, the pretreatment tank is used for pretreatment of polysulfone raw materials; an assembly rack arranged at one side of the pretreatment tank, the assembly rack is provided with a condenser; a guiding mechanism installed between the pretreatment tank and the condenser for guiding the solvent vapor discharged from the pretreatment tank into the condenser; a first container and a second container arranged below the assembly rack and connected to the condenser respectively; a grading tower arranged at one side of the assembly rack, the top of the grading tower is provided with a processing box, the processing box includes a flocculation chamber and a pelletizing chamber connected up and down, the flocculation chamber is connected to the condenser, and a retractable baffle is provided between the flocculation chamber and the pelletizing chamber; a flocculation mechanism arranged in the flocculation chamber for flocculating oligomers; a pelletizing mechanism arranged in the pelletizing chamber, the pelletizing mechanism is used for pelletizing the oligomers after flocculation.

2. The polysulfone purification production line according to claim 1, characterized in that: The pretreatment tank comprises a tank body; an outer pipe vertically fixed to the center of the inner bottom of the tank body; an inner pipe concentrically arranged in the outer pipe, with a mixing space left between the inner pipe and the outer pipe; a nozzle, the nozzles are distributed at intervals along the axial direction on the surface of the inner pipe; a driving mechanism, the driving mechanism is installed in the center of the outer bottom of the tank body and is transmission-connected with the inner pipe; a valve, the valve is opened on one side of the bottom of the outer pipe; a first main pipe, the first main pipe is connected between the side wall of the tank body and the outer pipe and the first main pipe is arranged downwardly inclined; a first branch pipe, the first branch pipe is branched from the middle part of the first main pipe and is connected to the outer pipe located below the first main pipe; a second main pipe, the second main pipe and the first main pipe are symmetrically distributed with respect to the outer pipe; a second branch pipe, the second branch pipe and the first branch pipe are symmetrically distributed with respect to the outer pipe; a microwave generator, the microwave generator is installed in the middle of the inner wall of the tank body and its antenna is aimed at the area where the first main pipe, the first branch pipe, the second main pipe and the second branch pipe are located on the outer pipe.

3. The polysulfone purification production line according to claim 1, characterized in that: The guiding mechanism includes: a first air duct fixedly connected to the air inlet end of the condenser; a second air duct and a third air duct connected to the first air duct via a three-way joint, the air inlet ends of the second air duct and the third air duct are respectively connected to the first container and the second container; a reflux pipe and a fourth air duct on the liquid outlet end of the condenser are connected via a three-way joint, the liquid outlet end of the reflux pipe extends into the second container, and the liquid outlet end of the fourth air duct extends into the flocculation chamber.

4. The polysulfone purification production line according to claim 3, characterized in that: The flocking mechanism comprises: a first stirring rod for flocking and flocculation rotatably mounted on the processing box through a sealed bearing, one end of the first stirring rod extending into the flocking chamber; A first mounting shell fixedly mounted on the processing box; a first speed regulator and a motor arranged in the first mounting shell, wherein the output shaft of the motor is fixedly connected to the input shaft of the first speed regulator via a coupling, and the output shaft of the first speed regulating mechanism is fixedly connected to the first stirring rod via a coupling.

5. The polysulfone purification production line according to claim 4, characterized in that: The pelletizing mechanism comprises: a circular hole plate fixedly mounted on the discharge end of the pelletizing chamber, the circular hole plate being provided with a discharge hole; an adjusting pressure plate arranged in the pelletizing chamber; a second hydraulic cylinder fixedly mounted on the outer wall of the pelletizing chamber at one end opposite to the circular hole plate through a mounting frame, the output rod of the second hydraulic cylinder extending into the pelletizing chamber and fixedly connected to the pressure plate; a guide shell fixedly connected to the discharge end of the pelletizing chamber, the guide shell being provided with a feed pipe connected to the grading tower, the feed pipe being provided with a first material valve; a pelletizing knife arranged in the guide shell and close to the circular hole plate, a rotating rod fixedly mounted on the pelletizing knife, the rotating rod being rotatably connected to the guide shell through a bearing; a transition shell fixedly connected between the guide shell and the first mounting shell, a second speed regulator fixedly mounted in the transition shell, the input shaft of the second speed regulator extending into the first mounting shell and transmitting with the output shaft of the motor through mutually meshing first bevel gears; and second bevel gears respectively fixedly mounted on the output shaft of the second speed regulator and the rotating rod and meshing with each other.

6. The polysulfone purification production line according to claim 1, characterized in that: A bracket is fixedly mounted on the processing box, a first hydraulic cylinder is fixedly mounted on the bracket, and an output rod of the first hydraulic cylinder is fixedly connected to the baffle through a connecting plate.

7. The polysulfone purification production line according to claim 3, characterized in that: The first container and the second container are both provided with a second heating plate for heating the raw material liquid. The grading tower is provided with a plurality of chambers for distillation, and the plurality of chambers are connected by a material pipe equipped with an electromagnetic material valve, and a third heating plate for distillation heating is provided in the chamber.

8. The polysulfone purification production line according to claim 7, characterized in that: A common first feeding pipe is arranged between the chambers, the first feeding pipe is fixedly connected with a shunt pipe, and the shunt pipe is provided with a solenoid valve.

9. The polysulfone purification production line according to claim 7, characterized in that: A fifth air duct for conveying steam is connected between the chamber and the first air duct.

10. The polysulfone purification production line according to claim 1, characterized in that: The pretreatment tank is equipped with a pump body through a connecting pipe. The discharge end of the pump body is connected to the first container through a pipeline for conveying the treated polysulfone raw material. A check valve is arranged on the pipeline. The bottom of the grading tower is fixedly connected with a discharge pipe for discharging the purified polysulfone material, and a valve is arranged on the discharge pipe.

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