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CN-121972109-A - Multi-kettle serial continuous polymerization system and production method

CN121972109ACN 121972109 ACN121972109 ACN 121972109ACN-121972109-A

Abstract

The present disclosure provides a multi-kettle serial continuous polymerization system and a production method thereof, and relates to the technical field of chemical production equipment. The system comprises a plurality of polymerization kettles which are arranged in series, wherein the polymerization kettles are sequentially connected in series through overflow pipes, at least one overflow pipe is arranged in each polymerization kettle, the overflow pipe extends downwards from the inside of the polymerization kettle and is led out from the bottom or the side wall of the lower part of the polymerization kettle, the overflow pipe of the front-stage polymerization kettle is led to a feed inlet of the next-stage polymerization kettle, the overflow pipe of the last-stage polymerization kettle is led to a post-treatment system, potential differences exist between the adjacent polymerization kettles, and an inclination angle exists between part or all differential pipe sections of a main body section of the overflow pipe in the polymerization kettle and a plumb line. The liquid level stabilizing control and material stable transmission are realized through the pure mechanical overflow pipe structure, an interstage pump and a complex detection control instrument are not needed, the equipment investment, the maintenance cost and the energy consumption are reduced, the material flow direction is naturally downward, the gas-liquid entrainment is reduced, the pressure fluctuation resistance capability is strong, and the operation is stable and reliable.

Inventors

  • ZHANG GUOPING

Assignees

  • 巨化集团有限公司
  • 浙江巨化技术中心有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (13)

  1. 1. A multi-kettle serial continuous polymerization system comprises a plurality of polymerization kettles which are sequentially arranged in series along the flow direction of materials, and is characterized in that, The polymerization kettles are sequentially connected in series through overflow pipes, at least one overflow pipe is arranged in each polymerization kettle, the overflow pipe extends downwards from the inside of the polymerization kettle and is led out from the bottom or the side wall of the lower part of the polymerization kettle, the overflow pipe of the former polymerization kettle is led to the feed inlet of the next polymerization kettle, and the overflow pipe of the last polymerization kettle is led to the aftertreatment system; The potential difference exists between the adjacent polymerization kettles; The overflow pipe has an inclination angle between a part or all of the differential pipe section of the main body section in the polymerization kettle and the plumb line.
  2. 2. The multi-tank serial continuous polymerization system of claim 1, wherein the inclination angle between a portion or all of the differential tube sections of the main section of the overflow tube and the plumb line ranges from 5 degrees to 30 degrees.
  3. 3. The multi-tank serial continuous polymerization system of claim 2, wherein the inclination angle between a portion or all of the differential tube sections of the main section of the overflow tube and the plumb line ranges from 10 degrees to 15 degrees.
  4. 4. The multi-tank serial continuous polymerization system of claim 1, wherein the overflow tube is a straight overflow tube or a curved overflow tube.
  5. 5. The multi-tank serial continuous polymerization system of claim 4, wherein the curvilinear overflow tube is a spiral overflow tube.
  6. 6. The multi-tank serial continuous polymerization system of claim 1, wherein the inlet height of the overflow tube within the polymerization tank is adjustable to set and maintain the liquid level of the corresponding polymerization tank.
  7. 7. The multi-tank serial continuous polymerization system of claim 6, wherein the height of the pipe of the overflow pipe inside the polymerization tank is adjusted by any of changing pipe sections of different lengths, using a liftable sleeve with a locking mechanism, using a bendable pipe fitting positioning member.
  8. 8. The multi-tank serial continuous polymerization system according to claim 1, wherein an anti-vortex device is provided at the inlet end of the overflow pipe and/or in the pipe.
  9. 9. The multi-tank serial continuous polymerization system according to claim 8, wherein the vortex prevention device is a plurality of axial guide fins axially arranged along the inner wall of the overflow pipe, and the guide fins are uniformly distributed along the circumferential direction.
  10. 10. The multi-tank serial continuous polymerization system of claim 8, wherein the vortex breaker is a vortex breaker plate disposed above the inlet end of the overflow tube.
  11. 11. The multi-kettle serial continuous polymerization system according to claim 1, wherein a discharge port which is independent or multiplexing with a feed port is arranged at the bottom of each polymerization kettle, the discharge port is connected with a discharge pump, and a discharge pipe connected with the discharge port is led to the feed port of the next-stage polymerization kettle or directly led to a post-treatment system.
  12. 12. The multi-tank serial continuous polymerization system of claim 11, wherein the discharge pump is a gear pump.
  13. 13. A process for the production of a multi-pot serial continuous polymerization system according to any one of claims 1 to 12, comprising the steps of: determining the set liquid level of each polymerization kettle according to the process requirements; Regulating the height of the inlet end of an overflow pipe in each polymerization kettle according to the set liquid level of each obtained polymerization kettle; continuously introducing reaction materials into a polymerization kettle at the head end of the series connection; When the liquid level of the polymerization kettle rises to the height of the inlet end of the corresponding overflow pipe, the material automatically flows into the next-stage polymerization kettle through the overflow pipe under the action of gravity until the system reaches a stable running state.

Description

Multi-kettle serial continuous polymerization system and production method Technical Field The disclosure relates to the technical field of chemical production equipment, in particular to a multi-kettle serial continuous polymerization system and a production method. Background In a multi-kettle serial continuous polymerization process, the realization of stable transmission of materials among kettles and precise control of liquid level are key. In the related art, two main ways are relied on, namely, an active control system is formed by adopting a pump, a regulating valve and a complex detecting instrument, equipment investment is large, maintenance cost is high and control logic is complex, and a kettle top overflow or siphon mode is adopted, so that the method is easily influenced by system pressure fluctuation, and materials flow upwards to easily entrain gas, so that operation stability is poor, and particularly, the method is prominent when driving or working conditions are changed. Therefore, there is a need for a simple, stable inter-tank transfer and control scheme. Disclosure of Invention The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. To this end, an embodiment of a first aspect of the present disclosure provides a multi-pot serial continuous polymerization system, including a plurality of polymerization pots sequentially arranged in series along a material flow direction; The polymerization kettles are sequentially connected in series through overflow pipes, at least one overflow pipe is arranged in each polymerization kettle, the overflow pipe extends downwards from the inside of the polymerization kettle and is led out from the bottom or the side wall of the lower part of the polymerization kettle, the overflow pipe of the former polymerization kettle is led to the feed inlet of the next polymerization kettle, and the overflow pipe of the last polymerization kettle is led to the aftertreatment system; The potential difference exists between the adjacent polymerization kettles; The overflow pipe has an inclination angle between a part or all of the differential pipe section of the main body section in the polymerization kettle and the plumb line. In some embodiments of the present disclosure, the angle of inclination between a portion or all of the differential tube section of the main section of the overflow tube and the plumb line ranges from 5 to 30 degrees. In some embodiments of the present disclosure, the angle of inclination between a portion or all of the differential tube section of the main section of the overflow tube and the plumb line ranges from 10 to 15 degrees. In some embodiments of the disclosure, the overflow tube is a straight overflow tube or a curved overflow tube. In some embodiments of the disclosure, the curved overflow tube is a spiral overflow tube. In some embodiments of the present disclosure, the overflow pipe is adjustable in inlet height within the polymerizer to set and maintain the liquid level of the corresponding polymerizer. In some embodiments of the present disclosure, the height of the pipe of the overflow tube inside the polymerizer is adjusted by either changing pipe sections of different lengths, using a liftable sleeve with a locking mechanism, using a bendable pipe fitting positioning member. In some embodiments of the disclosure, an anti-vortex device is disposed at the inlet end of the overflow tube and/or within the tube. In some embodiments of the disclosure, the vortex-preventing device is a plurality of axial guide fins axially arranged along the inner wall of the overflow pipe, and the guide fins are uniformly distributed along the circumferential direction. In some embodiments of the disclosure, the anti-vortex device is an anti-vortex baffle disposed above an inlet end of the overflow tube. In some embodiments of the disclosure, a discharge port which is independent or multiplexing with a feed port is arranged at the bottom of each polymerization kettle, the discharge port is connected with a discharge pump, and a discharge pipe connected with the discharge port is communicated with the feed port of the next-stage polymerization kettle or directly communicated with a post-treatment system. In some embodiments of the disclosure, the discharge pump is a gear pump. Embodiments of the second aspect of the present disclosure provide a method for producing a multi-tank serial continuous polymerization system according to the first aspect, comprising: determining the set liquid level of each polymerization kettle according to the process requirements; Regulating the height of the inlet end of an overflow pipe in each polymerization kettle according to the set liquid level of each obtained polymerization kettle; continuously introducing reaction materials into a polymerization kettle at the head end of the series connection; When the liquid level of the polymerization kettle rises to