TH6489B - Improvements to fluidized polymerization reactors. - Google Patents

Abstract

disclosed the fluidized Beck reactor and reactor operation process, including the distribution plate method for the distribution of flow that passes up into the fluidized bed, the mixing chamber is positioned under the trajectory of the spreader plate The fluid inlet path, ideally located on the reactor panel for the passage of the fluid into the reactor. The deflector trajectory is connected to the inlet trajectory, so that at least there is an ascending and outflow trajectory. fluid along the chamber wall of the mixing chamber to inhibit the accumulation of solids and liquids in the mixing chamber

Claims (16)

1. In a fluidized bed polymerization reactor with a diffuser plate pathway located beneath the fluidized bed area, a mixing chamber is formed. Within this chamber, in the area beneath the diffuser plate pathway, and with one or more inlet pathways for the flow of fluid into the reactor and through the mixing chamber, an improvement is made consisting of at least one flow diverter pathway located beneath the diffuser plate pathway and connecting at least one of the inlet pathways. This flow diverter pathway is optimized to provide at least two fluid flow paths for the fluid to enter the mixing chamber. The first fluid flow path runs along the wall of the mixing chamber, and the second fluid flow path is oriented upwards. During operation, solid particles (if any) in or entering the second flow path are lifted to the surface. The walls of the mixing chamber are then swept away to prevent the accumulation of such solid particles, and fluid accumulation in the mixing chamber is also inhibited. 2. In a fluidized bed polymerization reactor with a diffuser plate located beneath the fluidized bed area, a mixing chamber is formed within the reactor beneath this diffuser plate and one or more inlet pathways at or near the base of the reactor for the passage of fluid into the reactor and through the mixing chamber. An improvement is made by installing at least one flow diverter pathway in the mixing chamber and connecting it to at least one of the inlet pathways. This flow diverter pathway is optimized to provide at least two fluid flow paths for the fluid to enter the mixing chamber. The first flow path runs along the wall of the mixing chamber, and the second flow path is oriented upwards, which during operation carries solid particles (if any) present in or entering the second flow path upwards. The walls of the mixing chamber are then swept away to prevent the accumulation of such solid particles, and fluid accumulation in the mixing chamber is also inhibited. 3. Fluidized bed reactor according to claim 2, in which the diffraction pathway is generally annular and located above the inlet at a distance, where the first fluid flow path passes through the curtain region below the diffraction pathway and the second fluid flow path passes through a hole in the diffraction pathway. 4. Fluidized bed reactor under claim 3, in which the flow diffraction path is generally positioned perpendicular to the reactor axis. 5. Fluidized bed reactor under claim 3, in which the flow diffuser path is installed concave relative to the diffuser plate path. 6. A fluidized bed reactor under claim 3, in which the flow diffraction path is mounted convex relative to the diffuser plate path. 7. A fluidized bed reactor under claim 3, in which the mixing chamber path has a length-to-diameter ratio of approximately 1.5. 8. A fluidized bed reactor under claim 7, where the length-to-diameter ratio is between approximately 0.7 and approximately 10. 9. A fluidized bed reactor under claim 3, where the ratio of the area of the aforementioned vent path (A2) to the area of the curtain (A1) is given by the relationship (chemical formula) where do is the diameter of the annular diffuser, de is the diameter of the aforementioned inlet path, and h is the minimum distance from the lower outer edge of the annular diffuser to the mixing chamber wall, and where during operation HV > 0.345 kPa, where HV is the velocity pressure calculated from the total flow area of the diffuser. 10. A fluidized bed reactor under claim 9, where the A2/A1 ratio is approximately 0.3 and (do - de)/2h is approximately 2, and where the operating HV > 1.379 kPa. 11. In the operation of a fluidized bed polymerization reactor with a diffuser plate pathway installed beneath the bed to provide both fluid distribution and physical support for the bed, an inlet pathway is located at or near the base of the reactor for the passage of fluid into the reactor, and a mixing chamber is situated between the diffuser plate pathway and the inlet pathway, from which a continuous stream of gaseous fluid is introduced into the reactor, rising through the mixing chamber, through the diffuser plate pathway, and through the fluidized bed. Improvements include dividing the inlet stream into at least two streams: the first flows in an outer flow path exiting and rising along the walls of the mixing chamber, and the second flows upward in a fluid flow path generally perpendicular to the diffuser plate pathway. 12. A fluidized bed reactor under claim 2, where the annular diffraction path has dimensions such that HV > 0.345 kPa, where HV is the velocity pressure calculated from the total flow area of the diffraction device. 13. A fluidized bed reactor under claim 12, where HV > 1.379 kPa. 14. In the operation of a fluidized bed reactor with a diffuser plate installed beneath the bed to provide both fluid distribution and physical support, an inlet is located at or near the base of the reactor to allow fluid to enter the reactor. Typically, an annular fluid diffuser is connected to this inlet, and a mixing chamber is positioned between the diffuser plate and the inlet, where a continuous stream of gaseous fluid is introduced into the reactor through the inlet, up through the mixing chamber, through the diffuser plate, and the fluidized bed. An improvement involves dividing the incoming fluid stream into at least two streams. The first stream flows upward and outward in the peripheral fluid path between the annular diffuser and the mixing chamber wall, and the second stream flows in the central fluid path upward through the annular diffuser. The combined velocity and direction of the overall fluid flow path are designed to attract and transport the particles. Solids and liquids exit the mixing chamber through the plate pathways of the distributor and into the fluidized bed. 15. A fluidized bed polymerization reactor consists of: a. A typical cylindrical vessel; b. A diffuser plate pathway installed in the vessel, generally perpendicular to the vessel axis, defining the boundary of the fluidized bed region above the diffuser plate pathway and the mixing chamber region below the diffuser plate pathway; c. An inlet pathway for continuously introducing the polymerized fluid into the mixing chamber at a gas velocity sufficient to maintain the particles in the fluidized bed region in a suspended and fluidized state; d. An outlet pathway for continuously removing the unreacted polymerized gas from the fluidized bed region; e. A catalyst injection pathway for introducing the polymerization catalyst into the fluidized bed region; f. A product discharge pathway for transporting the polymerized product. The solid particles are removed from the fluidized bed area. A flow diffraction pathway connected to the inlet is optimized to divide the polymerized fluid stream flowing through the inlet into two or more streams flowing in at least two fluid paths, at least one of which is directed upward and outward along the walls of the mixing chamber and at least one is generally directed upward along the axis of the mixing chamber. This stream division is such that the velocity of the fluid flowing up the walls of the mixing chamber is sufficient to (1) carry the solid particles and keep them in the carried fluid and (2) inhibit the accumulation of the solid polymer product on the walls of the mixing chamber, and the velocity of the fluid flowing along the axis of the mixing chamber is sufficient to prevent the solid polymer product from falling into the inlet. Fluid accumulation in the mixing bed is also inhibited, and the total velocity and direction of the fluid flowing in the paths This flow is designed to provide sufficient mixing to ensure uniformity and distribution of the polymerized fluid entering the fluidized area. 16. The fluidized bed polymerization process is performed as follows: a. Continuously introducing a stream of polymerized fluid through the inlet into the mixing chamber at a velocity sufficient to keep the particle bed fluidized and suspended. b. Dividing this fluid stream into at least two streams flowing in at least two fluid paths. The fluid is directed up and out of one of these paths along the walls of the mixing chamber and directed up and out of one of these paths along the central axis of the mixing chamber, where sufficient upward flow of the fluid is induced along the walls of the mixing chamber to (1) carry the solid particles and keep them in the carried fluid and (2) inhibit the accumulation of the solid polymer product on the walls of the mixing chamber. Fluid accumulation in the mixing chamber is also inhibited by the upward flow of the fluid along the central axis of the mixing chamber, which is sufficient to prevent the polymer product from accumulating. The solid particles fall into the aforementioned chamber, and the combined velocity and direction of the stream are sufficient to ensure uniform mixing and distribution of the combined stream by the time it reaches the upper part of the mixing chamber. C. The uniform delivery of the combined stream is generally achieved through horizontal gas distribution plates into the fluidized bed zone above the mixing chamber, and the gas distribution plates maintain a sufficient combined velocity to keep the bed of solid polymer particles in a suspended and fluidized state. (Clause 16, page 6, figure 7)