51 results about "Polymerization reactor" patented technology

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.

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.

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.

This invention discloses a method and system for the continuous production of long-chain polyamides. The method includes: (1) feeding a diacid and a diamine into a prepolymerization reactor for a prepolymerization reaction, wherein the prepolymerization reactor is a horizontal screw reactor; (2) evaporating and dehydrating the product of the prepolymerization reaction; and (3) the output from step (2) entering a final polymerization reactor for continuous final polycondensation. The long-chain polyamides prepared by this method and system have a narrow molecular weight distribution, low viscosity, and stable performance. In particular, compared with batch methods, the process has a high degree of automation and high production efficiency.

This invention provides a waste heat utilization device and process for the production of long-chain nylon resin. The waste heat utilization device includes a polymerization reactor, an evaporator, a steam manifold, and a hot water circulation system. The hot water circulation system includes a hot water storage tank and a hot water circulation pump. The polymerization reactor is connected to the inlet of the hot water storage tank via an exhaust pipe to the hot water storage tank and to the inlet of the evaporator via an exhaust pipe to the evaporator. The outlet of the evaporator is connected to the steam manifold via an inlet pipe. The steam manifold is connected to the steam user end via a steam pipeline to the steam network. The outlet of the hot water storage tank is connected to the hot water user end via the hot water circulation pump and a hot water pipeline. This invention uses the steam discharged during the polymerization process as a heat medium to heat deionized water to obtain saturated steam and hot water, which are then supplied to the factory's steam and hot water users. This fully utilizes the waste heat from the polymerization process, reduces the factory's steam consumption, and lowers production energy consumption.

The present invention relates to a continuous ultrasonic reactor capable of performing continuous chemical reactions using multiple ultrasonic generators installed in parallel. The reactor body includes a reactant inlet and a product outlet, and the ultrasonic generators are uniformly arranged inside the reactor to induce mixing of reactants and the generation of free radicals through ultrasonic cavitation. As a result, the reaction can be effectively initiated without the use of a chemical initiator, and the reaction speed and efficiency are significantly improved. In addition, a cooling jacket is installed on the exterior of the reactor to stably maintain the reaction temperature, thereby ensuring uniformity of reaction conditions. The operating conditions of the ultrasonic generators can be adjusted via a control panel, allowing for flexible application to various chemical reaction processes. The present invention can be utilized in high-efficiency chemical processes such as polymer polymerization, nanoparticle synthesis, and drug encapsulation, and is an innovative technology that simultaneously provides energy efficiency and eco-friendliness.

The invention relates to process for producing a nucleated polypropylene, comprising the steps of: (i) supplying a reaction stream comprising vinyl cycloalkane into a first reactor; (ii) polymerizing the vinyl cycloalkane in presence of a catalyst system to obtain a product stream, wherein the product stream comprises polyvinyl cycloalkane, unreacted vinyl cycloalkane, and the catalyst system; (iii) supplying the product stream into a second polymerization reactor containing propylene; and (iv) polymerizing the propylene in presence of the product stream and hydrogen to obtain the nucleated polypropylene; The mass ratio of the polyvinyl cycloalkane to the unreacted vinyl cycloalkane present in the product stream is ≤ 0.5. The invention further relates to the nucleated polypropylene obtained from the process and having suitable optical clarity and tensile strength.

The utility model relates to polycarbonate reactor technical field, concretely relates to a kind of polycarbonate final polymerization reactor shaft seal disassembly tool, including fixed base, U-shaped movable plate, reaction shaft main body, lip seal, clamping plate, top plate and first pull plate, the U-shaped movable plate is set in the top of fixed base, the reaction shaft main body is set in the top of U-shaped movable plate, the lip seal is set in the inside of reaction shaft main body, the clamping plate is set in the inside of lip seal;Second screw is installed by the second threaded hole of top plate top, second screw can be stably connected with top plate, then second screw is penetrated first pull plate, when adjusting nut outside second screw is evenly fastened, the height of top plate changes, lip seal is slowly ejected with the spacer ring on it by top plate, it is convenient to disassemble and assemble the spacer ring and lip seal of polycarbonate final polymerization reactor shaft seal, and the outer surface of lip seal and spacer ring is not damaged in disassembly process, and the practicality is higher.

The present invention relates to a circulating polymerization reactor (1) comprising an annular reaction section intended to circulate a reaction medium in the loop, the reaction section being provided with one or more feed inlets (11) for at least reagents, optionally for catalysts and / or for solvents, and at least one discharge outlet (12), the reactor comprising at least one means (7) for causing movement of the reaction medium in the loop-shaped reaction section, the loop comprising a plurality of pipe sections fluidly connected to each other, the pipe sections including at least one straight section (5, 3) such that the pipe section or at least one of the pipe sections, particularly the straight section or at least one of the straight sections, accommodates an insert extending over at least 50% of the length of the section and over at least 50% of the cross-section of the section.

The invention discloses a polymeric kettle stirrer power supply or energy storage system and method utilizing waste heat, and belongs to the technical field of energy recycling, the system comprises a waste heat conversion module, the energy output end of the waste heat conversion module is connected with the input end of an energy storage module and the input end of a stirring driving module, and the stirring driving module is connected with the energy storage module. The output end of the energy storage module is connected with the input end of the stirring driving module, and the output end of the stirring driving module is in transmission connection with a polymerization kettle stirrer; the waste heat conversion module is used for converting waste heat into mechanical energy and amplifying the output acting force converted from the mechanical energy; the energy storage module is used for storing energy output by the waste heat conversion module; and the stirring driving module is used for receiving the amplified acting force output by the waste heat conversion module or the stored energy output by the energy storage module and driving a stirrer in the polymerization kettle to operate. Effective conversion of waste heat and recovery of tail gas moisture can be achieved, the resource utilization rate is increased, and accident load investment of the stirrer is reduced.

A slurry polymerization process for producing polyethylene in a polymerization reactor at a temperature of 40°C to 150°C and a pressure of 0.1 MPa to 20 MPa to obtain an ethylene-based polymer, wherein the polymerization occurs in the reactor slurry at least in the presence of a catalyst, ethylene and a diluent in the polymerization reactor, wherein the process comprises a shutdown phase in which at least one reactor inlet is closed, the reactor is cooled to a predetermined temperature threshold, the agitator is stopped, the reactor slurry is allowed to settle to the bottom of the internal reactor volume, active cooling of the reactor and heat exchangers is stopped, and the circulation loop pump is stopped.

The present disclosure provides improved methods of hydrocarbon recovery. In some embodiments, the method includes recovering a polyolefin product comprising one or more unreacted components from a polymerization reactor. The method includes contacting the polyolefin product with a purge gas to remove at least a portion of the unreacted components to produce (1) a polymer product having a reduced concentration of unreacted components and (2) a purge gas effluent stream rich in unreacted components. The method includes directing the purge gas effluent stream to a purge gas recovery unit.

Provided is a method for preparing an olefin-based elastomer including: supplying a cycle stream including an unreacted olefin comonomer and a residual solvent, a solvent stream including a solvent, and a comonomer stream including an olefin comonomer to a distillation column; obtaining an upper discharge stream from the distillation column including a low-boiling point component, a lower discharge stream from the distillation column including a high-boiling point component, and a side discharge stream from the distillation column including an olefin comonomer and the solvent, by distillation performed in the distillation column; supplying the side discharge stream from the distillation column and a monomer stream including an olefin monomer to a polymerization reactor and performing copolymerization to obtain a discharge stream from the polymerization reactor including an olefin-based elastomer solution; and supplying the discharge stream from the polymerization reactor including the olefin-based elastomer solution to a flash drum to obtain an olefin-based elastomer.

The application relates to the technical field of reaction kettles, and discloses a polymeric reaction kettle for coated asphalt production, which comprises a kettle body, a top cover, a driver and a power supply machine, the top cover is fixedly connected to the top end of the kettle body, high-pressure gas and rubber annular cylinders are sprayed to the materials at the bottom of the kettle body, the materials are extruded from two sides under the joint action, the materials at the bottom of the kettle body can be pushed to move upwards, cooperating with the feed inlet of the outer wall annular array of the rubber annular cylinder one, the materials in different areas in the kettle can be uniformly guided into the rubber annular cylinder one, the circulation conveying of the materials from the bottom to the top of the kettle body is realized; in addition, when the sleeve ring slides along the connecting rod one, the guide plate drives the annular rod, the limiting block drives the spray head to spray different areas at the bottom of the kettle body, the connecting rod one and the connecting rod two are cooperated to drive the rubber annular cylinder one and the rubber annular cylinder two to expand, the circulation range of the materials is further expanded, and the problem of material deposition at the bottom of the traditional reaction kettle is avoided.

Provided are methods for producing bimodal polyolefins comprising the steps of contacting α-olefin monomers with a catalyst in slurry polymerization conditions in the presence of zero to minimum hydrogen to produce a high molecular weight polyolefin and contacting additional α-olefin monomers in gas phase polymerization conditions and the high molecular weight polyolefin and the catalyst to produce bimodal polyolefin having high stiffness and broad molecular weight distribution. An additional step of polymerizing the bimodal polyolefin with a comonomer in a second gas phase can provide a bimodal impact copolymer having high stiffness and broad molecular weight distribution. Among the advantages of the present methods, bimodal polyolefins can be produced in a continuous process between a slurry polymerization reactor and a gas phase polymerization reactor without a venting step in between and with minimal hydrogen in the slurry polymerization reactor.

The application provides a bimodal molecular weight distribution ethylene-cycloolefin copolymer and a preparation method thereof. The method comprises the following steps: activating a same metallocene compound by using two kinds of cocatalysts, i.e., alkyl aluminum, in a first activation reactor and a second activation reactor respectively to obtain a first metallocene catalyst and a second metallocene catalyst respectively; pre-dissolving a cycloolefin monomer and ethylene respectively to obtain a cycloolefin monomer solution and an ethylene solution respectively; inputting the cycloolefin monomer solution and the ethylene solution into a polymerization reactor respectively; inputting the first metallocene catalyst and the second metallocene catalyst into the polymerization reactor respectively; performing polymerization reaction; sending materials discharged from the polymerization reactor into a reaction termination device to terminate the reaction and obtain a crude polymerization product; and separating to obtain the bimodal molecular weight distribution ethylene-cycloolefin copolymer. The application provides a method for synthesizing a bimodal molecular weight distribution cycloolefin copolymer at low cost.

A slurry polymerization method for producing polyethylene in a polymerization reactor at a temperature of 40°C to 150°C and a pressure of 0.1 MPa to 20 MPa to obtain an ethylene-based polymer, wherein polymerization takes place in a polymerization reactor in the presence of at least a catalyst, ethylene, and a diluent in the reactor slurry, and the method comprises a shutdown step in which at least one reactor inlet is closed, the reactor is cooled to a predetermined temperature threshold, the stirrer is stopped so that the reactor slurry settles to the bottom of the internal volume of the reactor, active cooling of the reactor and heat exchanger is stopped, and the circulation loop pump is stopped.

This utility model discloses a polymerization reactor and system. The reactor includes a polymerization reaction section, an inactivation section, and a discharge section connected in sequence. The polymerization reaction section includes a shell and a meshing screw penetrating the shell, so that the material fed into the polymerization reaction section undergoes a polymerization reaction through the meshing rotation of the screw, and the resulting product is transported to the inactivation section. The inactivation section and the discharge section are hollow structures, with the screw penetrating the inactivation section and extending into the discharge section. The shell of the inactivation section is provided with an injection port for injecting a terminator into the inactivation section to inactivate the polymerization chain end-capping of the polymer product in the resulting product, and the resulting product after polymerization chain end-capping inactivation is transported to the discharge section through the meshing rotation of the screw. The shell of the discharge section is provided with a devolatilization port and a discharge port to remove unreacted materials and by-products from the resulting product and to discharge the polymerization product after polymerization chain end-capping inactivation. This polymerization reactor can improve the quality of the polymerization product.

This invention discloses a neutralization reactor, production system, and preparation process for aramid adhesives. The neutralization reactor is a multi-stage continuous mixing reactor. The interior of the shell, from top to bottom, is equipped with a resin dispersion disc, a primary dispersion chamber, a secondary dispersion chamber, a tertiary dispersion chamber, and a discharge chamber. A rotating shaft is located at the bottom of the shell from bottom to top. The production system includes a solvent storage tank, a polymerization reactor, a neutralization reactor, a neutralization product buffer tank, a filter, and a product buffer tank, connected in sequence. The resin neutralization reactor of this invention employs multi-stage dispersion and high-shear reaction, greatly increasing the gas-liquid contact area, significantly improving the reaction rate, achieving near 100% neutralizer utilization, eliminating waste, and reducing tail gas recovery costs, thus lowering production costs. The production system of this invention effectively solves the problem of low production efficiency in aramid adhesives, providing an effective and feasible solution for mass production.

Disclosed is a process to polymerize olefins in a gas phase polymerization reactor. The process comprises adding ethylene, a comonomer, hydrogen, and a polymerization catalyst to a reaction zone of the gas phase polymerization reactor under first polymerization conditions to produce a first polyethylene having a first density and a first melt index. The first polymerization conditions comprise a first hydrogen addition rate (HA1), a first ethylene addition rate (EA1), and a first comonomer addition rate (CA1). A first comonomer addition ratio (C AR1) is defined as CA1 / EA1, a first total hydrogen ratio (THR1) is defined as (HA1+HG1) / EA1, and HG1 is a first rate of hydrogen generated in the reaction zone from a kinetic pathway associated with CA1. In some embodiments, the process further comprises implementing second polymerization conditions to produce a second polyethylene having a second density and a second melt index while reducing off-spec material produced when transitioning from first to second polymerization conditions.

This invention discloses a bio-based nylon fiber with antistatic function and its preparation method. The preparation method includes the following steps: S1: Under inert gas protection, bio-based 1,5-pentanediamine and diacid are added to deionized water in a certain proportion and stirred to form a uniform nylon salt solution; S2: The nylon salt solution, catalyst, and antioxidant are added to a polymerization reactor and heated to 200-230℃ under an inert gas atmosphere for polymerization reaction; then the temperature is raised to 240-260℃, polyethylene glycol is added, vacuum is applied, and the reaction is carried out for 1-2 hours; after the reaction is completed, inert gas is introduced, the material is discharged, cooled, drawn into strands, pelletized, and dried to obtain modified bio-based nylon resin particles; S3: The modified bio-based nylon resin particles are melt-spun to obtain the bio-based nylon fiber. The bio-based nylon fiber prepared by this invention has a long-lasting antistatic effect, excellent spinnability, and good environmental performance. In addition, the preparation process is simple and controllable, and easy to promote industrially.

This invention discloses a method for preparing low-film suspension PVC resin, belonging to the field of polymer chemical raw material technology. The technical solution includes the following steps: 1) coating the polymerization reactor with an anti-sticking agent; 2) adding water, initiator, dispersant, and microspheres to the polymerization reactor; 3) stirring, evacuating the reactor, and then adding 100 parts of vinyl chloride monomer; 4) continuing stirring, heating, and initiating the polymerization reaction; adding a terminator after the pressure in the polymerization reactor drops to the process control point; 5) continuing stirring, recovering the monomer, discharging the slurry, and sieving it through a sieve. The slurry passing through the sieve is then subjected to air stripping, centrifugation, and drying to obtain low-film suspension PVC resin. This invention adds non-polar or VCM monomer-repellent microspheres during the polymerization process, which act as an isolation agent, reducing the probability of PVC particle aggregation during formation, thereby preparing low-film suspension PVC resin.

The utility model belongs to the field of polymerization reaction, concretely relates to a kind of bulk polymerization reactor, reaction tank, the top of the reaction tank is provided with tank cover, the inner wall of the tank cover is rotatably connected with rotating shaft, adjusting assembly is provided on the tank cover, stirring paddle is provided on the adjusting assembly, the adjusting assembly includes threaded seat, the bottom of the tank cover is fixedly connected with threaded seat, the inner wall of the threaded seat is threadedly connected with threaded rod, the top of the threaded rod is fixedly connected with rotating block.This bulk polymerization reactor is accurately lifted on threaded seat by rotating rotating block, drives arc clamping seat, synchronous disc and sliding long board to move cooperatively, the angle of stirring paddle can be adjusted quickly, the design can flexibly change stirring paddle angle according to different material characteristics and reaction stage, compared with traditional fixed-angle stirring paddle, material mixing efficiency is improved, effectively avoid the problem of insufficient or excessive reaction in local reaction.

The utility model relates to a kind of polyester final polymerization reactor even heating system, belong to polyester production technical field, including gas phase heat medium collection tank, gas phase heat medium degassing pipeline, gas-liquid separator, vacuum pump, vacuum pump's input pipeline, partition valve and vacuum pump's output pipeline;Gas phase heat medium collection tank is connected with gas-liquid separator by gas phase heat medium degassing pipeline, and connecting point A and connecting point B are equipped on gas phase heat medium degassing pipeline, and partition valve is arranged between connecting point A and connecting point B;Vacuum pump's input pipeline is connected with connecting point A in one end, and the other end is connected with the input end of vacuum pump;Vacuum pump's output pipeline is connected with connecting point B in one end, and the other end is connected with the output end of vacuum pump;Valve IV is equipped on vacuum pump's input pipeline, and valve V is equipped on vacuum pump's output pipeline;The polyester final polymerization reactor even heating system of using the utility model can be more uniform in the initial stage in the heating process of polyester final polymerization reactor, and temperature rises.

This invention relates to the field of polymer material synthesis technology, and discloses a method for preparing a styrene-isoprene block copolymer for medical hot-melt pressure-sensitive adhesive, comprising the following steps: under anhydrous and oxygen-free conditions and under high-purity nitrogen protection, a refined mixed solvent is added to a polymerization reactor, and after impurity removal titration with alkyl lithium, an alkyl lithium initiator is added; refined styrene is added to carry out a polymerization reaction to obtain active polystyrene segments; a composite polarity modifier is added, and then refined isoprene is added to carry out a polymerization reaction to obtain an active styrene-isoprene diblock copolymer; medical-grade epoxidized soybean oil is added to the system as a halogen-free coupling agent to carry out a coupling reaction to obtain a star-shaped styrene-isoprene block copolymer; an antioxidant terminator is added to terminate the reaction, and after coagulation, dehydration, and hot air drying, a medical-grade finished product is obtained. Using the method of this invention, a medical-grade copolymer with regular structure, excellent performance, and safety and non-toxicity can be obtained.

The invention relates to process for producing an ethylene copolymer in a high pressure polymerization reactor (T), comprising the step of polymerizing an ethylene monomer with a vinyl based monomer (D) in presence of an inhibitor compound to obtain the ethylene copolymer, wherein the inhibitor compound is represented by the chemical formula I wherein the substituents R1 to R9 are as defined in the disclosure. The invention further relates to an ethylene copolymer obtained from the process of the present invention.

The utility model relates to a polymerization reaction device for PVC (polyvinyl chloride) resin production, which comprises a polymerization kettle, a circulating pump, a pipeline reactor and a circulating port, the pipeline reactor consists of a plurality of straight pipe sections, bent pipe sections connected between two adjacent straight pipe sections, and temperature adjusting jackets arranged on the outer sides of the straight pipe sections; according to the technical scheme, the bent pipe section is provided with an inflection point, the inlet section is provided with a side cleaning short pipe, the side cleaning short pipe is tangentially connected with the outer edge of the inflection point, the side cleaning short pipe is provided with a control valve close to the bent pipe section, the outlet end of the straight pipe section is provided with a flow meter, and an outlet pipeline of the circulating pump is connected with an inlet pipeline of the buffer tank. A material taking pipe extending to the bottom of the buffer tank is additionally arranged at the top of the buffer tank, and a pressurizing feeding assembly is arranged between the upper end of the material taking pipe and the side cleaning short pipe. The device can monitor the flow of the slurry in the pipeline in real time, and can clean the slurry adhered to the bent part of the pipeline in time, so that the normal and stable operation of polymerization reaction is ensured.

This invention relates to the field of polystyrene devolatilization technology, and particularly to a supercritical-supergravity coupled deep devolatilization device and method for polystyrene. The device includes a five-reactor polymerization reactor, a devolatilization preheater, a supercritical fluid system, a first devolatilizer, an intermediate gear pump, a second devolatilizer, a discharge gear pump, and an independent vacuum system. The five-reactor polymerization reactor, the devolatilization preheater, the first devolatilizer, the intermediate gear pump, the second devolatilizer, and the discharge gear pump are connected sequentially. The supercritical fluid system is connected before the first devolatilizer. The second devolatilizer includes a sealed shell and a rotatable annular packed rotor, with a packing layer inside the annular packed rotor. The independent vacuum system is connected to both the first and second devolatilizers. This invention has the following advantages: it couples the plasticizing and diffusion-enhancing characteristics of supercritical fluids with the forced film-forming and renewing characteristics of supergravity to polystyrene devolatilization, solving the mass transfer bottleneck that is difficult to overcome by a single method.