Abstract:
A method is disclosed for fluidizing a spent catalyst in a regenerator during a combustion process. The combustor includes a vessel and an air distributor. The air distributor includes an air grid and a plurality of first nozzles extending from the air grid. Spent catalyst is introduced into the vessel. Air is provided to the vessel via the plurality of first nozzles at a base combustion air rate. Additional air is provided to the vessels via a plurality of second nozzles of a fluffing air distributor at a fluffing air rate that is between 0.5 wt% and 10 wt% of the base combustion air rate to fluidize the catalyst. The second nozzles have outlets that are disposed below the air grid and above a bottom head of the vessel.
Abstract:
The present invention relates to a process for the continuous preparation of a polyolefin in a reactor from one or more α-olefin monomers of which at least one is ethylene or propylene, wherein the reactor comprises a fluidized bed, an expanded section located at or near the top of the reactor, a distribution plate located at the lower part of the reactor and an inlet for a recycle stream located under the distribution plate, wherein the process comprises - feeding a polymerization catalyst to the fluidized bed in the area above the distribution plate - feeding the one or more α-olefin monomers to the reactor - withdrawing the polyolefin from the reactor - circulating fluids from the top of the reactor to the bottom of the reactor, wherein the circulating fluids are cooled using a heat exchanger, resulting in a cooled recycle stream comprising liquid, and wherein the cooled recycle stream is introduced into the reactor using the inlet for the recycle stream wherein a stream comprising a thermal run away reducing agent (TRRA-containing stream) is introduced into the expanded section during at least part of the polymerization process, wherein said TRRA-containing stream is brought into contact with at least part of the interior surface of the expanded section.
Abstract:
A spray nozzle assembly 10 to use multi-stages atomization of liquid feed for fluidized catalytic cracking process is described. The assembly comprises an inner conduit 50 comprising a liquid inlet 22 to let liquid feed flow to enter there through and a passageway to provide a passage to the liquid feed flow. The inner conduit comprises a plurality of sets of discharge orifices disposed at specific locations of the inner conduit to discharge droplets of the liquid feed flow. The assembly 10 further comprises an outer conduit 17 comprising a gas inlet 21 to let a gas stream to enter into the outer conduit. The outer conduit defines a mixing zone 20 where the liquid feed and the gas stream are mixed to achieve the atomization. The mixed flow is discharged through orifices 26 of the spray nozzle tip.
Abstract:
Gegenstand der Erfindung sind ein Wirbelschichtreaktor zur Herstellung von polykristallinem Siliciumgranulat sowie ein Verfahren zur Montage eines solchen Wirbelschichtreaktors, umfassend nachfolgende Schritte in der angegebenen Reihenfolge: Bodenplatte (4) aufbauen und mit Gaszufuhrleitungen für Fluidisierungsgas und Reaktionsgas und Produktabzugsleitung (20) verbinden; Bodenplatte (4) mit wenigstens einer Fluidisierungsdüse (6) und mit wenigstens einer Reaktionsgasdüse (5) bestücken; Untere Reaktorrohrdichtung (7) einsetzen; Reaktorrohr (8) mit Heizer (10), Elektroden (1 1 ) und Isolationen (12, 13) auf untere Reaktorrohrdichtung (7) aufbauen; Aufstellen des Reaktorschusses (1 ) über dem Reaktorrohr (8); Obere Reaktorrohrein- spannung (14) mit oberer Reaktorrohrdichtung (15) aufbauen; Montage des Reaktorkopfes (16); Montage Seedzufuhreinrichtung (17); Montage Abgasrohrleitung (18).
Abstract:
The invention relates to a gas distribution device for producing a fluidized bed (10), comprising a wind box (1) and, arranged above it, a double-bottom nozzle base (2) having a base plate (4) provided with a plurality of nozzles (3) and a distributor plate (5) on top thereof, which define between them a gas chamber, characterized in that the double-bottom nozzle base (2) is a continuous nozzle base having a porous or perforated distributor plate (5) and the gas chamber of the nozzle base (2) is subdivided into a plurality of compartments (7) by means of a plurality of walls (6) between the base plate (4) and the distributor plate (5).
Abstract:
The invention relates to synthesis of methyl carbamate (MC) and dimethyl carabonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.
Abstract:
Die Erfindung betrifft eine Gasverteilerdüse (25), umfassend einen senkrecht nach oben gerichteten Gaszulauf (1) sowie einen Schwebekörper (13), mit dem eine Austrittsöffnung aus dem Gaszulauf (1) verschließbar ist, wenn kein Gas strömt, wobei der Schwebekörper (13) einen Schwerpunkt aufweist, der unterhalb eines Kraftangriffspunktes der Gasströmung liegt. Weiterhin umfasst die Erfindung einen Reaktor mit einem Festkörperbett und mindestens einer Gasverteilerdüse (25).
Abstract:
The invention relates to synthesis of methyl carbamate (MC) and dimethyl carabonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.
Abstract:
Reactor vessel and a feed nozzle assembly (1) for feeding a gas and a liquid into such reactor vessel. The feed nozzle assembly comprises an outer tube (3) supplying a first liquid feed, such as oil, an inner tube (2) supplying a dispersion gas, such as steam, a third tube (23) supplying a second liquid feed, such as biomass, and a nozzle end. A catalytic cracking process wherein two or more hydrocarbon liquids are jointly dispersed into a dispersion gas and jetted via the same feed nozzle assembly (1) into a catalytic cracking reactor (30).