Patent EP-1967261-A1 (EP)
Inventor: DE BROQUEVILLE AXEL
IPC: B01J8/14
Filed: 2007-03-02
Abstract: The device with rotating fluidized bed useful in a polymerization process, comprises a feeding device of fluids, gases/liquids and solid particles laid around a circular outer wall of a circular chamber, a device for evacuating the fluids and solid particles, a fixed feeding chamber placed in the interior of circular chamber, a device for recycling a portion of the fluids towards the fluid feeding device, an annular disc, a helical coil, a compressor or turbine, a controlling ring, an element, and two circular chambers. The device with rotating fluidized bed useful in a polymerization process, comprises a feeding device of fluids, gases/liquids and solid particles laid around a circular outer wall of a circular chamber, a device for evacuating the fluids and solid particles, a fixed feeding chamber placed in the interior of circular chamber, a device for recycling a portion of the fluids towards the fluid feeding device, an annular disc, a helical coil, a compressor or turbine, a controlling ring, an element, two circular chambers and a device for spraying a liquid inside of the rotating tube or fixed concentric tube. The feeding device comprises openings for injecting the fluid traversing the circular outer wall in a direction of which a component is tangent to the circular wall. The evacuation device comprises a central rotating tube (7) traversing or entering longitudinally interior to the circular chamber. The central rotating tube comprises evacuation opening (9). An external circular wall of the chamber is fixed in the rotating tube delimiting a rotating annular chamber, and is rotated in the same direction of the tube and at rotational speed lower than the rotation speed of the tube. The openings comprise longitudinal slits separated by a distance less than twice of an average distance between the circular wall and the central tube wall. The evacuation openings are delimited by hollow blades, which are supplied by fluids through a central tube to serve transmission shaft. The hollow blades comprise openings for injecting the fluid in rotational direction in the rotating tube. An inner and outer surface of external and internal ends of the blades have an inclination/incidence angle of higher than 45[deg] . The outer surface of a middle part of the blades has an inclination/incidence angle of (17.2) less than 30[deg] . A distance separating the external end of blade is less than a distance between the outer end and the circular outer wall. Cross-sections of the circular chamber and the rotating tube are in a form of circles, polygons, ellipses and other forms of varying curvatures. The inner surface of the circular outer wall is polygonal. The cross-sections of the circular chamber have a constant surface, a gradually varying surface and a step by step varying surface. A diameter of the central rotating tube is maximum in sides where the fluids can be evacuated from central rotating tube. The central rotating tube comprises paddles, blades or vanes to pull out a fluid layer in a rotating movement around the central rotating tube, and is prolongated beyond the circular chamber by expanded rotating tube to turn inside a separating chamber making cyclonic center. The fixed feeding chamber is divided into two fluid feedable annular zones separately. The circular chamber is divided into two separate annular zones by partitions equipped with openings through which the solid particles can pass. The central rotating tube is divided into two zones connected with the separated fluid evacuation device. The fluid evacuation device comprises the central rotating tube fitted with paddles, blades or vanes, and a concentric fixed tube traversing the annular section of the circular chamber and equipped with an opening to evacuate the fluids centrally and separately from the annular section. The paddles, blades or vanes are extended to turn around and outside of the fixed tube thus allowing turning the fluid layer surrounding the fixed tube. The compressor or turbine is connected to the rotating tube by a transmission axis passing through the tube and by a portion of the evacuated fluids. The fluid evacuation device comprises a turbine wheel or a rotating compressor. An inlet of the tube is placed at a distance of the circular inner wall lower than a half of the average distance between the circular outer wall and inner wall of the central rotating tube. The feeding and evacuation device of the solid particles injects and evacuates the particles on one side of the circular chamber or in the central part of the chamber or at both ends of the circular chamber respectively. The controlling ring is fixed along the circular wall near the solid particle evacuation device. An inner diameter of the controlling ring is greater than a diameter of the desired surface of the fluidized bed. The element allows the solid particles to move longitudinally from the deflectors, coils or fractions of helical coils, which is fixed along the circular wall or rotating tube. The rotational axis of the fluidized bed and the tube forms an angle of less than 45[deg] and comprises a set of separating rings or helical coils of which the inner diameter is greater than the desired diameter of the rotating fluidized bed. The separating ring or the helical coils are hollow and are fed with fluid by the fluid feeding device, where the fluid is injected in a rotational direction of the rotating fluidized bed. The controlling/separating rings or the helical coils comprise a passage for solid particles located on the circular wall. A catalytic conversion involves a change of distribution of the olefin molecular weight and dehydrogenation for transforming ethylbenzene into styrene. The solid particles having components are reacted with hydrogen obtained from the dehydrogenation to reduce concentration of the components in the fluid or mixture of fluids, where the components are regenerated outside of the rotating annular chamber. The solid particles are formed of grains, powder or other fragments of organic origin. An independent claim is included for a catalytic polymerization process.