357 results about "Polymerization reactor" patented technology

The invention discloses flame-retardant anti-fouling copolymer nylon 6 and a preparation method and application thereof, and the preparation method comprises the following steps: adding a phosphorus-containing flame-retardant monomer, a silicon-containing reaction monomer, lactam, an initiator and a catalyst into a polymerization reaction kettle, and introducing nitrogen to replace air in the kettle; under the protection of nitrogen, firstly raising the temperature to 180-220 DEG C to carry out prepolymerization reaction, and then raising the temperature to 240-260 DEG C to carry out polymerization reaction; and after the polymerization reaction, removing water vapor in the system to react in a normal pressure state, then vacuumizing to react, filling nitrogen to recover to normal pressure after the reaction is finished, and discharging and cooling to obtain the flame-retardant and anti-fouling copolymer nylon 6. The phosphorus-containing comonomer and the silicon-containing comonomer are introduced into the copolymerized nylon, the intrinsic flame-retardant nylon material with high flame-retardant efficiency and permanent flame retardance is prepared through melt copolymerization at a relatively low introduction amount, and the intrinsic flame-retardant nylon material has certain hydrophobic and anti-fouling properties and also retains good mechanical properties and spinnability of the nylon material.

A continuous process for preparing a multimodal polyolefin composition made from or containing one or more antioxidants, including the steps of: preparing a multimodal polyolefin in form of a polyolefin powder, having a mass-median-diameter D50 in the range from 300 μm to 2500 μm, in a series of polymerization reactors; mixing the polyolefin powder and an organic peroxide without melting the polyolefin powder; melting and homogenizing the mixture within an extruder device; adding one or more antioxidants to the molten polyolefin composition; homogenizing the combination of molten polyolefin composition and antioxidant, thereby forming an antioxidant equipped molten polyolefin composition; and pelletizing the antioxidant equipped molten polyolefin composition.

The invention provides a prepolymerization reactor, a continuous bulk polymerization system and method and PMMA resin. The method comprises the following steps: mixing accurately metered polymeric monomers and auxiliaries, sequentially completing a prepolymerization reaction and a polymerization reaction in serially connected polymerization reactors, and then devolatilizing and granulating a polymerization product to obtain PMMA resin, and comprises the following steps: step 1, purifying and mixing reaction materials; step 2, prepolymerization reaction; step 3, polymerization reaction; step 4, devolatilization; and step 5, granulating. The method overcomes the defects that in the prior art, the polymerization conversion rate is low, the solvent usage amount is large, the molecular weight distribution of the product is wide, light transmittance and other properties cannot meet optical-grade application requirements, and the quality is difficult to accurately regulate and control. Through optimization of a formula and process conditions, a special process system design and combination of polymerization reactors, the contradiction between high conversion rate in the polymerization process and narrow molecular weight distribution of a PMMA product is solved; under the conditions of low solvent addition amount or no solvent, the high conversion rate is obtained, the molecular weight distribution of the polymerization product is narrow, the molecular weight is controllable, and the high-quality optical-grade PMMA resin product is obtained.

The invention belongs to the technical field of chemical production reaction equipment, and discloses a polymerization kettle which comprises a polymerization kettle body and an obliquely arranged condenser, the air inlet end of the condenser is communicated with the top of the polymerization kettle body through a pipeline, the polymerization kettle further comprises a driving assembly, the driving assembly comprises two driving discs, the driving discs are arranged in a shell pass of the condenser, and the driving discs are arranged in the shell pass of the condenser. The two driving discs are rotationally arranged at the air inlet end and the air outlet end of the condenser correspondingly, and the two ends of a tube nest of the condenser penetrate through the two driving discs correspondingly and are fixedly connected with the driving discs; the motor is arranged outside the shell pass, and an output shaft of the motor penetrates through the shell pass and is coaxially and fixedly connected with one driving disc; according to the scheme, the driving disc is driven by the motor to drive the tube nests to rotate, so that the tube nests originally located at the upper part and the lower part are alternately contacted with low-temperature circulating water at the water inlet and high-temperature circulating water at the water outlet, and meanwhile, the temperature distribution of the circulating water is more uniform; according to the invention, the problem of insufficient condensation efficiency caused by low top temperature and high bottom temperature of the kettle top condenser is solved.

A process for the continuous production of a polyolefin polymer in a gas-phase polymerization reactor in the presence of a polymerization catalyst and an antistatic agent, including the steps of (a) providing a mixture of polyolefin particles and gas, (b) conveying the mixture through a pipe at a gas velocity of greater than or equal to 2 m / s, and (c) introducing an antistatic agent into the mixture.

1. A method for transitioning two different catalysts during the production of a polypropylene homopolymer or copolymer in a sequential multi-stage polymerization reaction, said method comprising: a) polymerizing propylene and optionally a comonomer in the presence of a first catalyst in a multi-stage polymerization reactor system comprising a prepolymerization reactor followed by a slurry reactor and then a gas phase reactor; b) discontinuing the supply of the first catalyst to the prepolymerization reactor; c) subsequently introducing propylene, optionally a comonomer, and a second catalyst into said prepolymerization reactor, and further introducing an aluminum alkyl into said polymerization reactor simultaneously with said introduction of said second catalyst; d) polymerizing propylene and optionally a comonomer in the presence of a second catalyst in said multi-stage polymerization reactor system. The process includes the steps of: wherein the first catalyst is a Ziegler-Natta catalyst and the second catalyst is a single-site catalyst; and wherein the amount of aluminum alkyl supplied in step c) is 0.5 to 10.0 g per ton of total propylene supplied into the prepolymerization reactor and the slurry reactor in steps c) and d). The method.

The invention belongs to the technical field of polyester fibers, and relates to a method for measuring and calculating key parameters based on simulated three-dimensional PET concentration field distribution, which comprises the following steps: firstly, deducing a causal structure in a polyester fiber reactor according to an information theory, secondly, grading and disassembling the causal structure to obtain a disassembled causal structure, and finally, calculating the key parameters of the polyester fiber reactor according to the disassembled causal structure. Driving one stage in the training process through each disassembled causal structure to obtain an output and a sum; the method comprises the following steps of: firstly, carrying out common input, and carrying out weight initialization by using a Caul-guide Init method, constructing a deep neural network (DNN), applying theoretical constraint to a model, and outputting three-dimensional PET concentration field distribution; and finally, measuring and calculating key parameters by utilizing theoretical knowledge of the polyester fibers and combining the output three-dimensional PET concentration field distribution. The method provided by the invention can accurately simulate the three-dimensional PET concentration field in the polyester fiber polymerization reactor, is used for measuring and calculating key parameters, and improves the measurement and calculation precision.

The preparation method is characterized by comprising the following steps: adding D3F and D4 into a polymerization reaction kettle together for dehydration, introducing vinyl by adopting a self-made cross-linking comonomer, adding a vinyl double-end-capping agent for end capping, adding tetramethylammonium hydroxide and an accelerant DMSO (Dimethylsulfoxide), and carrying out polymerization reaction at 120 DEG C for 1-2 hours in a normal-pressure nitrogen environment, so as to obtain the high-molecular-weight fluorosilicone copolymerized raw rubber. And raising the temperature to inactivate the catalyst, and removing the low temperature to obtain the fluorosilicone copolymerized raw rubber. According to the invention, D3F and dimethyl siloxane ring body are copolymerized, so that the cost is saved, vinyl-containing trifluoropropyl siloxane ring body is prepared, vinyl can be effectively connected into the fluorosilicone polymer, the distribution uniformity of vinyl in the main chain of the fluorosilicone polymer is improved, the vulcanization performance is improved, the chain back-bite phenomenon in the polymerization process can be effectively inhibited by adding the accelerant, and the service life of the fluorosilicone polymer is prolonged. The tetramethylammonium hydroxide catalyst is adopted, so that the neutralization step is omitted, polymerization and low molecule removal by heating are carried out in one reaction kettle, the operation is simple, and production and popularization are easier.

This invention relates to the application of hypergravity technology in coordination polymerization, and discloses a method for preparing hyperbranched polyethylene and its application. The method includes: (1) carrying out coordination polymerization of ethylene monomer, solvent, catalyst solution, and auxiliary catalyst solution under hypergravity conditions; and (2) removing the monomer, washing, separating, and drying the reaction product obtained in step (1). By controlling the hypergravity level, reactant ratio, reaction temperature, and pressure, this invention can obtain high-quality hyperbranched polyethylene products with a number-average molecular weight of 1000-1500000 and a molecular weight distribution index of 1.2-2.5. Compared with reactions in ordinary polymerization reactors, the production efficiency is significantly improved, and the product has a higher molecular weight and a narrower molecular weight distribution.

A cooling, condensing and exhausting system of a thermal polymerization reaction kettle comprises a kettle body, an outlet is formed in the middle of the top of the kettle body, an inlet is formed in the top end of the kettle body, one end of a first output pipeline is fixedly installed at the outlet, and the other end of the first output pipeline is communicated with an inlet of a first heat exchanger. An outlet of the first heat exchanger is connected with an inlet of a second heat exchanger through a second output pipeline, an outlet of the second heat exchanger communicates with an inlet of a low-temperature container through a third output pipeline, and an outlet of the low-temperature container communicates with an inlet of a feeding pump through a fourth output pipeline. An outlet of the feeding pump is communicated with an inlet of a high-level tank through a fifth output pipeline, and an outlet of the high-level tank is communicated with the inlet of the kettle body through an input pipeline. Through the heat exchanger and the high-level tank, waste heat carried by the circulating liquid can be eliminated through the heat exchanger, and the high-level tank can ensure that the density of the circulating liquid is uniform and the temperature in the kettle body is maintained within a preset value, so that the yield of finally obtained finished products is effectively improved.

Embodiments of a dual reactor solution polymerization process include: introducing a first feed comprising an ethylene monomer, optionally hydrogen, optionally a C3-C12 alpha-olefin comonomer, and a hydrocarbon solvent into a first polymerization reactor to produce a first reactor product comprising an ethylene-based polymer via solution polymerization at a temperature of 100 DEG C to 225 DEG C; and introducing the first reactor product and a two-phase second feed comprising an ethylene monomer, a hydrocarbon solvent, optionally hydrogen, and optionally a C3-C12 alpha-olefin comonomer to a second polymerization reactor to produce an ethylene-based polymer via solution polymerization, wherein the weight ratio of the sum of hydrocarbon solvent plus comonomer in the two-phase second feed to ethylene monomer is 0.1 to 2.0.

The utility model belongs to the technical field of polymerization reaction kettles, and particularly relates to an anti-yellowing physical foaming PBT copolyester polymerization reaction kettle which comprises a bottom plate, a plurality of supporting frames are symmetrically arranged at the top end of the bottom plate, the supporting frames are L-shaped, mounting rings are arranged at the top ends of transverse frames of the supporting frames, an outer kettle body is arranged in the mounting rings, and the outer kettle body is arranged in the bottom plate. An inner kettle body is arranged in the outer kettle body, a fixing rod is arranged at the top end of the bottom plate, a chassis is arranged at the top end of the fixing rod, a material mixing assembly is arranged in the inner kettle body and comprises a rotating shaft, the rotating shaft is sleeved with a plurality of shaft sleeves, and a plurality of material mixing rods are arranged on the outer side walls of the shaft sleeves in a surrounding mode; a plurality of scrapers are arranged on the top end surface of the chassis, and a plurality of stirring rods are arranged on the outer side walls of the scrapers in parallel, so that materials can be uniformly mixed, the heat of the device can be preserved, and the materials react under proper conditions.

The invention belongs to the technical field of reaction kettles, and discloses a high-efficiency polymerization reaction kettle for producing a polycarboxylic acid water reducer, the high-efficiency polymerization reaction kettle comprises a reaction kettle body, a stirring plate I and a stirring plate II, a composite rotating part is rotatably mounted in the reaction kettle body, the stirring plate I and the stirring plate II are fixedly connected to the outer surface of the composite rotating part, and the stirring plate I and the stirring plate II are fixedly connected to the outer surface of the composite rotating part. A midway injection mechanism is arranged in the composite rotating part, the composite rotating part rotates around the midway injection mechanism in the composite rotating part, and the midway injection mechanism is used for injecting the material liquid into the mixed liquid in the stirring reaction period. According to the invention, the key additive is directly sprayed to the specified depth in the reaction liquid instead of being only added on the liquid surface, so that the problem of over-high local concentration is avoided, the material can be instantly and uniformly dispersed in the reaction system, the stability and controllability of the reaction are greatly improved, the high consistency of the product performance is ensured, and the product quality is improved. Accurate, multi-point and deep injection of materials in the reaction process is achieved.

The application discloses an ethylene and alpha-olefin copolymerization evaluation test device, which comprises an olefin mixed gas distribution device, a polymerization reactor, a temperature control unit, a pressure control unit and a stirring device. The polymerization reactor is connected with the olefin mixed gas distribution device, the temperature control unit is connected with the polymerization reactor, and the pressure control unit is connected with the polymerization reactor. The stirring device comprises a stirring shaft and a stirring paddle. The stirring shaft is a hollow structure with a gas flow pipeline inside. One end of the stirring shaft penetrates through a cover of the polymerization reactor and is provided with a gas inlet. The other end of the stirring shaft is connected with the stirring paddle. The stirring paddle is arranged at the bottom of the polymerization reactor. At least one gas outlet is arranged on the stirring paddle. The ethylene and alpha-olefin copolymerization evaluation test device can increase the contact amount of ethylene and alpha-olefin with a catalyst. The ethylene and alpha-olefin copolymerization evaluation test device can be used for evaluating ethylene polymerization, and the catalyst activity can be accurately evaluated.

The invention relates to the technical field of olefin catalyst polymerization, in particular to a preparation method of ethylene propylene diene monomer. The method comprises the following steps: carrying out anhydrous oxygen operation treatment on a polymerization reaction kettle by using a vacuum-gas raw material replacement method, introducing a gas raw material prepared in proportion into the polymerization reaction kettle to achieve the required polymerization original pressure, continuously introducing a main catalyst, a cocatalyst, a hexane solvent and ethylidene norbornene into the polymerization reaction kettle at the same time, starting a polymerization reaction; and introducing circulating cooling water into an outer jacket of the polymerization reaction kettle in the reaction process to maintain the stability of the polymerization reaction temperature, inactivating the polymerization system after the polymerization reaction is finished, removing the solvent, and drying to obtain the ethylene propylene rubber. The prepared ethylene propylene diene monomer is high in stability, the molecular mass of the product is controllable, and the molecular mass distribution is obviously narrowed.

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

This invention provides a polymerization reactor for polyimide preparation, belonging to the field of polymerization reactor technology. It includes a reactor body, with an integrally cast reactor bottom and a integrally cast reactor top. A motor mounting slot is provided at the center of the bottom of the reactor bottom. Eight drainage holes are evenly spaced circumferentially on the outer wall of the reactor body. The reactor body and reactor bottom are equipped with up-and-down and in-and-outward churning components. This invention uses high-speed centrifugal force to throw the solution from the lower interior of the reactor body and guide it to different circumferential trajectories on the upper interior of the reactor body. This achieves both up-and-down churning of the solution and redistribution of the solution from the outside to the inside of the reactor body, ensuring efficient subsequent mixing and uniform mass and heat transfer.

The invention provides a hydrophilic oleophobic fluorinated ethylene propylene resin preparation device which is characterized in that a stirrer (4) is positioned in the middle of a polymerization reaction kettle (1), a heating device is arranged at the bottom of the polymerization reaction kettle (1), the polymerization reaction kettle (1) is connected with a vacuumizing device (6), and the polymerization reaction kettle (1) is communicated with a dryer (9) through a condensation barrel (7), a demulsification device and a rinsing bath (8); the dryer (9) is connected with a powder vibrating screen (10); and the powder vibrating screen (10) is communicated with a finished product storage tank (11). According to the method disclosed by the invention, a functional monomer introduced with a hydrophilic group is added into a polymerization reaction kettle to react, tetrafluoroethylene and hexafluoropropylene are added to participate in copolymerization, and finally the fluororesin powder coating is prepared by the method and the device. The fluorinated ethylene propylene resin powder coating prepared by the method and the device has hydrophilic and oleophobic characteristics, the preparation process is simple and convenient, and the production cost is low.

The utility model discloses a polymerization system for dehydration condensation reaction, which belongs to the technical field of polymer production and comprises a polymerization reaction kettle, a through hole is arranged at the top of the polymerization reaction kettle, a tower column is vertically arranged on the through hole, the tower column comprises a plurality of tower sections which are sequentially communicated from top to bottom, and fillers are arranged in the tower sections. A tower cap is arranged at the top end of the tower section located at the uppermost end of the tower column, a cooling jacket and a thermometer are arranged on the tower cap, a gas phase outlet is formed in the upper portion of the tower cap and connected with a water removal tank, a gas outlet in the top of the water removal tank is connected with a recovery device, and a vacuum pump is connected to the tail end of the recovery device in the running direction of the recovery device; the vacuum pump is connected with a PLC. By utilizing the tower column, a solvent and a monomer with high boiling points are condensed, and water and impurities with lower boiling points leave the tower column, so that the raw material waste is reduced while the reaction is promoted; a water removal tank is arranged to absorb moisture in gas, so that the moisture in the gas is prevented from condensing when residual solvents and monomers are condensed in the recovery device, and the separation effect is not influenced.

This utility model discloses a polyvinyl chloride suspension polymerization reactor, relating to the field of polymerization reactor technology. It includes an outer reactor body with a connecting frame on its annular side. A right-angle gear is rotatably connected inside the connecting frame, and a connecting block is fixedly connected to the lower surface of the connecting frame. An inner reactor body is rotatably connected inside the outer reactor body. During the stirring process, the output shaft of a servo motor drives the fixed right-angle gear to rotate. The rotation of the right-angle gear causes the inner reactor body, which is engaged with it, to rotate as well. The inner reactor body is rotatably mounted inside the outer reactor body via two fixed connecting rings. At this time, the rotation direction of the inner reactor body is opposite to that of the stirring rod. This interaction allows the materials to be subjected to forces in different directions, resulting in more thorough mixing and effectively improving the polymerization reaction effect.

The invention provides a polymerization reaction kettle. The polymerization reaction kettle comprises a kettle body; the stirring mechanism is arranged in the kettle body; the stirring mechanism comprises a stirring shaft and at least two stirring groups, the stirring shaft comprises at least two sleeve shafts which are sequentially connected in the axial direction of the kettle body, the rotating directions of every two adjacent sleeve shafts are opposite, and each sleeve shaft is at least connected with one stirring group; the stirring group comprises at least two stirring blades, and the stirring blades are arranged on the two sides of the sleeve shaft at intervals; the cooling assembly comprises at least one cooling pipe, and the cooling pipes are annularly arranged on the periphery of the stirring shaft and staggered with the stirring blades. According to the polymerization reaction kettle, the coaxial positive and negative rotation stirring groups are arranged, so that materials in the reaction kettle are more violently turbulent and are more uniformly mixed, the cooling pipes are distributed at all positions in the polymerization reaction kettle and are mutually staggered with the stirring groups, heat generated by polymerization reaction in the kettle can be effectively absorbed, the stability and the uniformity of products are ensured, and the production efficiency is improved. And the production efficiency is improved.

The invention relates to the technical field of nylon resin, and particularly provides nylon resin and a preparation method thereof. The preparation method comprises the following steps: adding a lactam monomer, an end-capping reagent, a catalyst and water into a polymerization reactor for ring-opening polymerization, and releasing pressure to normal pressure; the polymerization reactor is purged until the water content of the purged gas is smaller than 500 ppm, then an antioxidant is added, for example, the sum of the mass ratio of the end-capping reagent to the catalyst to the lactam monomer is not larger than 0.0045, the mass ratio of the lactam monomer to the antioxidant is 1: (0.0001-0.005), and otherwise, the mass ratio of the end-capping reagent to the catalyst to the antioxidant is 1: (0.0001-0.002); vacuumizing, discharging after staying, and dicing; the obtained nylon resin has few impurities, a yellow value as low as-8 to-6, molecular weight distribution of 4-5, high notch impact strength, strong toughness and excellent low temperature resistance, and can be used for automobile oil pipes and gas transportation pipelines in cold regions.

The present invention relates to a reactor for the continuous vapor phase polymerization of one or more monomers, and in particular provides a reactor which is a horizontal mechanically stirred polymerisation reactor and which includes, disposed within the reactor, an agitator which comprises a central shaft and a plurality of stirring paddles, wherein the central shaft has a diameter of 300 to 1750mm and a length of 9 to 25 meters, and each stirring paddle a) extends radially from the shaft, b) has a first surface with an area of 0.1 to 1.5 m2, and c) has a cross-section which comprises either i. a triangular cross-section, or ii. a partial ellipsoidal cross-section, or iii. a three-dimensional cross-section other than a triangular or partial ellipsoidal cross-section and which is such that in use there is no stagnant zone behind the first surface.

The utility model discloses a polyreactor for preparing polyester yarn production raw materials, which comprises a conveying driving structure, a reactor body structure is fixedly mounted above the conveying driving structure, the conveying driving structure comprises a conveying box, connecting columns are fixedly mounted on two sides of the conveying box, and a connecting block is fixedly mounted above the conveying box. A through hole is formed between the connecting blocks in a penetrating mode, a discharging pipe with a control valve is fixedly installed at the bottom of the conveying box in an inlaid mode, an auger rod is rotatably installed in the conveying box in the mode of penetrating through the connecting column, a driving gear is fixedly installed at one end of the auger rod, and a bearing frame is fixedly installed above the connecting column; and a driving motor is fixedly installed above the connecting column, meanwhile, a driving gear is installed at the output end of the driving motor in a penetrating mode, the driving gear is connected with the driving gear in a meshed mode through a chain, and according to the polymerization reaction kettle for preparing the polyester yarn production raw materials, the auger rod is arranged, so that rotary conveying is achieved.

The present disclosure provides a process. In an embodiment, the process includes introducing an antifoulant into an ethylene feed of a reactor system. The reactor system includes the ethylene feed, a hyper-compressor, a preheater and a polymerization reactor. The ethylene feed is located upstream of the hyper-compressor. The antifoulant consists of an inhibitor, molecular oxygen, and optionally a solvent. As the ethylene feed is located upstream of the hyper-compressor, the process includes introducing the antifoulant into the ethylene feed upstream of the hyper-compressor. The process further includes adding a free radical initiator to the polymerization reactor. The process further includes polymerizing the ethylene in the polymerization reactor under high pressure free-radical polymerization conditions, and forming an ethylene-based polymer.

The invention provides a polymerization reaction kettle, and belongs to the technical field of reaction kettles.The polymerization reaction kettle comprises a kettle body and a stirring shaft rotationally arranged in the kettle body, the interior of the stirring shaft is hollow, and a sleeve is arranged on the stirring shaft in a sliding mode; the material mixing mechanism comprises a plurality of groups of stirring rods arranged on the stirring shaft, the stirring rods are horizontally arranged, cavities are formed in the stirring rods, and the stirring rods are communicated with the cavities in the stirring shaft to form circulation channels; by arranging the stirring adjusting mechanism, the angle and position of the stirring component can be automatically adjusted according to the material viscosity, and when the material viscosity is increased, the vertical stirring area is automatically increased; meanwhile, the posture of the stirring component is changed through linkage of pressure change of cooling liquid, and the heat exchange area and the stirring range are enlarged. According to the design, the stirring action can sense the real-time state and spatial difference of materials in the kettle, and the problems of mixing dead angles and non-uniform heat transfer caused by a fixed stirring mode of a traditional reaction kettle are solved.

A high-pressure polymerization system having a) a polymerization reactor and b) a reactor blow down system having b1) a reactor blow down vessel, having a circular design over a major portion P having a L / D-ratio in the range from 1.75 to 10.0 and containing an aqueous quenching medium, b2) a release line connecting the polymerization reactor with the reactor blow down vessel and having an outlet located above a maximum level for the aqueous quenching medium, b3) a first emergency valve in the release line to open and close fluid communication between the polymerization reactor and the reactor blow down system, and wherein the release line outlet has a joining piece having an angle (α) between the central axis and a tangent at the reactor blow down vessel in the range from 5° to 70° and the reactor blow down vessel has a vent stack containing a constricted section.

This invention provides a polymerization reactor for vinyl polyolefin elastomers and its application. The polymerization reactor includes a reaction vessel and a heat exchange jacket fitted onto the outer wall of the reaction vessel. The inner wall of the reaction vessel is provided with continuous spiral ribs or continuous spiral grooves, and its surface has a smooth transition structure without sharp corners or dead angles. This invention also discloses the application of this polymerization reactor in the polymerization of vinyl polyolefin elastomers. This invention significantly improves heat transfer efficiency by increasing the heat exchange area through the continuous spiral structure, disrupting the near-wall thermal boundary layer, and inducing local vortices. The spiral structure, together with the guide tube, guide holes, and baffles, forms a multi-stage synergistic system, optimizing the flow field inside the reactor and achieving beneficial effects such as improved heat transfer efficiency, reduced cooling water consumption, stable temperature control, and excellent anti-sticking effect. It is suitable for continuous or batch polymerization production of vinyl polyolefin elastomers.

The utility model relates to the technical field of chemical equipment, in particular to a stirring paddle for a polymeric kettle, which comprises a connecting shaft, a transverse plate, a plurality of first connecting plates, a plurality of second connecting plates and a plurality of plough type shovel plates, one end of the connecting shaft is connected with an external power source, the connecting shaft is provided with a groove, and the transverse plate is fixedly connected with the groove. The first connecting plates and the second connecting plates are fixedly connected with the transverse plate and located below the transverse plate, the second connecting plates are located at the positions where the first connecting plates rotate by 180 degrees along the axial center line of the connecting shaft, and the lengths of the first connecting plates are sequentially decreased from the middle point of the transverse plate to one end of the transverse plate. The lengths of the plurality of second connecting plates are sequentially reduced from the middle point of the transverse plate to one end far away from the first connecting plate, so that the technical problem that the product performance is influenced due to low efficiency and non-uniform mixing caused by simple stirring when a stirring paddle is used for treating high-viscosity materials in the prior art is solved.

A slurry flow valve may be used to control flow in a gas phase polymerization reactor. For example, a system may include at least three injection nozzles in fluid connection with a gas phase polymerization reactor, where the at least three injection nozzles are configured to carry a modified catalyst slurry; at least three lines connected to the at least three injection nozzles, wherein the at least three lines include a first line connected to a first injection nozzle, a second line connected to a second injection nozzle, and a third line connected to a third injection nozzle; and at least three slurry flow valves in contact with the at least three lines, wherein the at least three slurry flow valves include a first slurry flow valve, a second slurry flow valve, and a third slurry flow valve. Preferably, each valve may be independently controlled to regulate flow therethrough.