Search

CN-122006645-A - Polymerization reactor and application thereof

CN122006645ACN 122006645 ACN122006645 ACN 122006645ACN-122006645-A

Abstract

The invention belongs to the field of reactors, and relates to a polymerization reactor and application thereof, wherein the polymerization reactor comprises a cylinder body, an upper sealing head and a lower sealing head; the inner part of the cylinder body is provided with a tube array, the tube array comprises a central guide tube and a downflow tube, a fluid distributor is arranged in the upper end enclosure, and the upper part of the central guide tube extends into the upper end enclosure. The polymerization reactor of the invention has better thermal efficiency and hydraulic efficiency.

Inventors

  • YANG JIANCHUN
  • ZHU RONGXIN

Assignees

  • 北京诺维新材科技有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. The polymerization reactor comprises a barrel, an upper end enclosure and a lower end enclosure, wherein the upper end enclosure is arranged at the top of the barrel, the lower end enclosure is arranged at the bottom of the barrel, a tube array is arranged in the barrel and comprises a central guide tube and a downflow tube, the central guide tube is used as a rising channel after mixing polymer materials, catalyst and the polymer materials returned in the downflow tube, the downflow tube is arranged at the periphery of the central guide tube and used for returning part of the polymer material mixture to the bottom of the reactor, and the polymerization reactor is characterized in that the upper part of the central guide tube extends into the upper end enclosure, a fluid distributor is arranged in the upper end enclosure and is cylindrical, and the fluid distributor is arranged above the downflow tube.
  2. 2. The polymerization reactor according to claim 1, wherein the ratio of the length of the extension of the upper part of the central draft tube into the upper end socket to the height of the upper end socket is (0.1-0.8): 1, and the extension of the central draft tube is obliquely arranged, and the included angle a between the extension and the central line of the reactor cylinder is 0-30 degrees.
  3. 3. The polymerization reactor according to claim 1 or 2, wherein the radius of the bottom end of the cylinder of the fluid distributor is equal to or smaller than the radius of the top end, and the bottom end of the cylinder is connected with the tube plate, wherein the radius of the bottom end of the cylinder is R, the relation between the R value and the inner diameter R 1 of the central guide tube and the inner diameter R 2 of the cylinder is R= [ (R 1 2 +R 2 2 )/2] 1/2 + -20%), the radius of the top end of the cylinder is R 3 , and R 2 ＞R 3 is equal to or larger than R.
  4. 4. A polymerisation reactor according to any of claims 1-3, wherein the angle b between the cylindrical wall of said fluid distributor and the centre line of the reactor cylinder is 0-30 °.
  5. 5. The polymerization reactor according to claim 4, wherein the angle b between the cylindrical wall of the fluid distributor and the center line of the reactor cylinder is 5 to 20 °.
  6. 6. The polymerization reactor of any one of claims 1-5 wherein the angle a between the extension of the central draft tube and the centerline of the reactor bowl is from 5 ° to 20 °.
  7. 7. The polymerization reactor according to any one of claims 1 to 6, wherein a circulation agitator is provided inside the central draft tube, the circulation agitator being provided at a middle lower portion of the central draft tube.
  8. 8. Use of a polymerisation reactor as claimed in any of claims 1 to 7 in a polymerisation reaction.
  9. 9. The use according to claim 8, wherein the polymerization is a cationic polymerization.
  10. 10. The use according to claim 9, wherein the polymerization reactor is used for the cationic polymerization of olefins at-110 ℃ to 0 ℃.

Description

Polymerization reactor and application thereof Technical Field The invention belongs to the field of reactors, relates to a polymerization reactor and application thereof, and in particular relates to a polymerization reactor for olefin cationic polymerization and application thereof in olefin cationic polymerization. Background The cationic polymerization of olefins is one of the important industrial processes for the preparation of synthetic rubber, for example the copolymerization of isobutylene with small amounts of isoprene to form copolymer butyl rubber, the combination of butyl rubber and halogen to form halogenated butyl rubber, both of which are important synthetic rubber varieties, being the main raw materials for the preparation of tires. The cationic polymerization reaction is intense, the heat release amount is large, the heat must be removed in time in the reaction process, the reaction temperature is controlled well, the ideal polymer product can be obtained, and the polymerization reactor for the cationic polymerization reaction used in industry is designed around the purpose. A representative polymerization reactor is disclosed in, for example, patent document RU2097122, the reactor is a vertical tubular reactor, the center of the reactor is provided with a plurality of layers of multileaf stirring, a plurality of groups of tube bundles are arranged in the reactor, liquid ethylene is introduced into the tube bundles and takes away polymerization heat through ethylene vaporization, patent document US5417930 discloses a butyl rubber tubular reactor of Exxon company, the tube side is a polymerization reaction zone, the shell side is introduced with a refrigerant to remove the reaction heat, the tube side is composed of equal-diameter tubes and is divided into two zones, the central tube bundle is an ascending pipeline, the peripheral tube bundles are descending channels, a propeller is arranged at the bottom of the reactor, the reaction materials enter the tube side from the bottom of the reactor for reaction, most of the materials flow from the peripheral tube bundles back to the bottom of the reactor after passing through the propeller, and the top of the reactor is provided with a discharge tube, and patent document CN103608100 discloses an improved tubular reactor, which is different from US5417930 in that a central tube is changed into a single tube with a large-diameter tube as a central flow guide, the reaction materials ascend from the central flow guide, and in order to ensure that the flow velocity of the reaction liquid flows up from the central flow guide to the central flow guide tube is provided with a uniform horn mouth. However, the existing reactor still has the problem of uneven flow rate of reaction materials, and the reactor still has polymer wall built-up scaling caused by unbalanced reaction, thereby influencing the heat transfer efficiency of the refrigerant, and the reaction heat can not be discharged in time, so that the reaction is difficult to continue, and the industrial problem of cleaning has to be stopped. Thus, there remains a need for a cationic polymerization reactor that provides for a uniform flow rate of the reaction mass and thus a prolonged polymerization cycle. Disclosure of Invention The invention provides a polymerization reactor and application thereof, and compared with the disclosed tubular reactor, the reactor has better thermal efficiency and hydrodynamic efficiency. Specifically, the invention provides a polymerization reactor, which comprises a cylinder, an upper seal head and a lower seal head, wherein the upper seal head is arranged at the top of the cylinder, and the lower seal head is arranged at the bottom of the cylinder; The reactor comprises a cylinder body, a catalyst and a reactor, wherein a shell is arranged in the cylinder body, the shell comprises a central guide pipe and a downpipe, the central guide pipe is used as an ascending channel after mixing a polymer material, the catalyst and the polymer material returned in the downpipe, and the downpipe is arranged at the periphery of the central guide pipe and is used for returning part of the polymer material mixture to the bottom of the reactor; The upper part of the central flow guide pipe stretches into the upper sealing head, the ratio of the extending length to the height of the upper sealing head is (0.1-0.8): 1, the extending part of the central flow guide pipe is obliquely arranged, and the included angle a between the extending part and the central line of the reactor cylinder body is 0-30 degrees. According to an embodiment of the invention, preferably said a is 5-20 °. According to the embodiment of the invention, the upper end socket is internally provided with a fluid distributor, and the fluid distributor is cylindrical. According to an embodiment of the invention, the fluid distributor is arranged above the downcomer. According to an embodiment of the invention, the rad