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CN-224208030-U - Ultra-high purity polyethylene slurry process production system

CN224208030UCN 224208030 UCN224208030 UCN 224208030UCN-224208030-U

Abstract

The utility model relates to an ultra-high purity polyethylene slurry method production system which comprises a reaction kettle, a flash tank, a drum filter unit and a solvent collecting tank, wherein the reaction kettle is provided with a slurry discharge hole, the flash tank is connected with the slurry discharge hole of the reaction kettle, a gas circulation pipeline is arranged at the top of the flash tank to circulate a flashed gas component to the reaction kettle, the drum filter unit is connected with the discharge hole of the flash tank and is used for sequentially filtering, washing and drying flashed slurry, a filtrate outlet of the drum filter unit is connected with the solvent collecting tank, and the solvent collecting tank is communicated with the reaction kettle through the pipeline to circulate the solvent to the reaction kettle. Compared with the prior art, the reaction kettle, the flash tank and the rotary drum filter unit in the system are connected with each other efficiently, and the solvent and the unreacted gas raw materials are recycled to form a closed-loop material circulation system, so that raw material waste and emission are reduced. The drum filter unit integrates the traditional scattered filtering, washing and drying processes into an integrated process, so that the number of equipment and the occupied area are greatly reduced, and the operation and maintenance cost is reduced.

Inventors

  • WANG YANLI
  • SHAO QINGNAN
  • SUN XUHUI
  • JIANG PENGXIANG
  • ZHU YUFEI
  • ZHANG WENLONG

Assignees

  • 朴烯晶新能源材料(上海)有限公司
  • 龙朴科技(衢州)有限公司
  • 璞烯晶新材料(上海)有限公司

Dates

Publication Date
20260508
Application Date
20250530

Claims (10)

  1. 1. An ultra-high purity polyethylene slurry process production system, comprising: A reaction kettle (200) provided with a slurry discharge port; The flash tank (300) is connected with a slurry discharge port of the reaction kettle (200), and a gas circulation pipeline is arranged at the top of the flash tank to circulate the flashed gas components to the reaction kettle (200); The rotary drum filter unit (100) is connected with a discharge port of the flash tank (300) and is used for sequentially filtering, washing and drying the slurry subjected to flash evaporation, a filtrate outlet of the rotary drum filter unit is connected with the solvent collecting tank (400), and the solvent collecting tank (400) is communicated with the reaction kettle (200) through a pipeline to circulate the solvent to the reaction kettle (200).
  2. 2. The ultra-high purity polyethylene slurry process production system according to claim 1, wherein the reaction kettle (200) is a kettle-type stirred reactor provided with a cooling jacket; One or more reaction kettles (200) are arranged, and a plurality of reaction kettles (200) are arranged in parallel or in series.
  3. 3. The ultra-high purity polyethylene slurry process production system according to claim 1, wherein a compressor (500) is provided on the gas circulation line of the flash tank (300).
  4. 4. The ultra-high purity polyethylene slurry process production system according to claim 1, wherein a slurry shear pump is provided on a transfer line between the reaction vessel (200) and the flash tank (300); And/or a dilution tank is further arranged between the reaction kettle (200) and the flash tank (300), and a gas phase outlet of the dilution tank is communicated with the reaction kettle (200) through a gas phase balance pipeline.
  5. 5. The ultra-high purity polyethylene slurry process production system according to claim 1, wherein the raw material feed port of the reaction vessel (200) is connected to a raw material purifying unit (700) and a catalyst configuring unit (600), respectively; the raw material purifying unit (700) comprises a packed adsorption tower; the catalyst deployment unit (600) includes a catalyst tank.
  6. 6. An ultra-high purity polyethylene slurry process production system according to claim 1, wherein the drum filtration unit (100) comprises a housing (1), a drum (2) rotatably provided in the housing (1), a plurality of isolation seals (3) circumferentially spaced along the housing (1), a plurality of compartments (4) provided on the surface of the drum (2), and a draft tube (5) communicating with the compartments (4); Along the rotation direction of the rotary drum (2), the isolation sealing piece (3) sequentially separates the annular chamber between the shell (1) and the rotary drum (2) into an independent sealed filtering process section (A), a washing process section (B), a drying process section (C) and a discharging process section (D).
  7. 7. The ultra-high purity polyethylene slurry process production system according to claim 6, wherein the filtration process section (a) is provided with a slurry feed port (8) connected to the flash tank (300) by a pipe; The washing process section (B) is provided with a washing liquid inlet (9) which is connected with a washing liquid storage tank (11) through a pipeline; the drying process section (C) is provided with a drying gas inlet (10) and is connected with a drying gas storage tank (12) through a pipeline.
  8. 8. The ultra-high purity polyethylene slurry process production system according to claim 6, wherein the discharge process section (D) is provided with a doctor blade mechanism (6) and a rinse nozzle (7).
  9. 9. The ultra-high purity polyethylene slurry process production system according to claim 6, wherein the isolation sealing member (3) is a pneumatic isolation sealing member and comprises an isolation plate, the isolation plate is made of chemical corrosion resistant plastic, a filter plate is arranged on the surface of the rotary drum (2), and a support net and filter cloth are sequentially paved on the filter plate.
  10. 10. The ultra-high purity polyethylene slurry process production system according to claim 6, wherein the bottom of the compartment (4) is provided with a through-flow hole (13), the inside of the rotary drum (2) is provided with a control head, one end of the through-flow pipe (5) is connected with the through-flow hole (13) at the bottom of the corresponding compartment (4), the other end is connected to the control head, and the control head is used for independently discharging media of different process sections.

Description

Ultra-high purity polyethylene slurry process production system Technical Field The utility model relates to the technical field of ultra-high-purity polyethylene preparation, in particular to an ultra-high-purity polyethylene slurry method production system. Background Polyolefin is used as a core basic raw material in the field of high polymer materials and is widely applied to the manufacturing fields of injection molding, film preparation, pipe production and the like. Wherein, the high-end polyolefin represented by ultra-clean high purity belongs to polyolefin products with high technical content, high application performance and high market value, and is applied to various high-value fields including medical fields, new energy battery diaphragm materials, high-end filter materials and the like. For example, ultra-high purity polyethylene has important applications in the fields of semiconductor packaging, medical implant materials, high-end optics, etc., where purity and impurity content are required to meet stringent standards. The slurry process is a mature process for producing polyolefin, and is characterized by dispersing aliphatic hydrocarbon inert solvent and monomer in solvent, forming polymer under the action of catalyst, suspending polymer particles in solvent, and separating out polyolefin synthesized by slurry process in form of fine dispersion so as to make the whole polymerization system be slurry-like. The process is a current mainstream production process due to the advantages of simple design, mild operation conditions, easy temperature control, uniform mixing, high monomer conversion rate, relatively easy treatment and the like. In the slurry process synthesis process, the reacted polymer slurry (containing the target product, solvent, oligomers, residual catalyst, and other impurities) needs to be separated to obtain the final product. At present, a centrifuge is adopted to remove part of solvent, and then nitrogen is utilized to remove and recycle residual solvent in a step-by-step drying mode, for example, the method for producing ultra-high molecular weight polyethylene by using a Seranis slurry method is adopted, but the centrifuge has the advantages of high energy consumption, low productivity, high failure rate and high nitrogen recycling cost, and seriously influences the technical and economic indexes of a slurry method production device. In order to obtain a high purity polymer product, it is often necessary to perform steps such as washing, filtering, drying, etc., to remove impurities therefrom. However, in order to realize the steps, a plurality of sets of process devices such as a washing kettle/washing tank, a vacuum centrifuge, a dryer/drying kettle and the like are required to be combined, auxiliary equipment such as a conveying pump, a fan and the like and matched pipelines, pipe fittings, valves and the like are required to be arranged between the devices, the process flow is long, the redundant operation is numerous, the solvent leakage is easy to occur, and great potential safety hazards exist. In addition, the devices are large in size, large in occupied area and high in energy consumption, and the more the devices are used, the greater the risk brought by the failure rate of the devices is, the long-period continuous and stable operation of the process production is difficult to ensure, and the process improvement is still needed. Disclosure of utility model The utility model aims to solve the problems and provide an ultra-high purity polyethylene slurry method production system. The aim of the utility model is achieved by the following technical scheme: An ultra-high purity polyethylene slurry process production system comprising: The reaction kettle is provided with a slurry discharge port; The flash tank is connected with a slurry discharge port of the reaction kettle, and a gas circulation pipeline is arranged at the top of the flash tank for circulating the flashed gas components to the reaction kettle; The rotary drum filter unit is connected with a discharge port of the flash tank and is used for sequentially filtering, washing and drying the slurry subjected to flash evaporation, a filtrate outlet of the rotary drum filter unit is connected with the solvent collecting tank, and the solvent collecting tank is communicated with the reaction kettle through a pipeline and circulates the solvent to the reaction kettle. As a preferable technical scheme of the utility model, the reaction kettle is a kettle type stirring reactor and is provided with a cooling jacket, and preferably, the cooling jacket is an inner jacket; The reaction kettles are arranged in one or more than one reaction kettles, and a plurality of reaction kettles are arranged in parallel or in series. As a preferable technical scheme of the utility model, a compressor is arranged on a gas circulation pipeline of the flash tank. As an optimal technical scheme, a slurry shearing pump is arranged