A fluidized-bed reactor (1A) includes a reaction vessel (10A) configured to contain metallurgical grade silicon powder and a hydrogen chloride gas, and a portion of a side wall (w) which portion extends along at least 80% of a height extending from a gas feed opening (21), which is provided in a lower part of the reaction vessel (10A), to a top face of a fluid bed (40) has such a tapered shape that a cross section of the reaction vessel (10A) which cross section is taken perpendicular to a height direction of the reaction vessel (10A) increases in area in an upward direction.

A new process for the decomposition of hydrocarbon feed stream(s) that achieves the conversion of a hydrocarbon feed stream to hydrogen and filamentous carbon, with minimal resulting production of carbon oxides is described herein. In this invention it is proposed to achieve the hydrocarbon conversion by the use of dual fluidized bed reaction zones, fluidly connected, for (i). hydrocarbon reaction (the reactor) and (ii). catalyst regeneration and heating (the regenerator) and to use a transition metal supported catalyst to achieve high hydrocarbon conversion and to produce high quality filamentous carbon.

A feed injector may have a body having an outer wall and an inner wall with a first conduit formed between the outer wall and the inner wall. The first conduit is configured to receive a atomizing gas. Additionally, a second conduit may be formed by the inner wall, and the second conduit is configured to receive a liquid. The first conduit and the second conduit are separated by the inner wall. Further, a mixing chamber may be provided at an outlet of the first conduit and an outlet of the second conduit. The atomizing gas from the first conduit and the liquid from the second conduit hit and/or mix together in the mixing chamber to form liquid droplets and a mixture of the atomizing gas and the liquid. Furthermore, a flow cone may have a first end in the second conduit and a second end in the mixing chamber.

A method and a device for preparing a carbon nanotube and a prepared carbon nanotube. The method includes: adding iron pentcarbonyl and nickel tetracarbonyl into a multi-stage series fluidized bed and performing decomposition to obtain a catalyst, and discharging the carbon monoxide generated; adding a carbon source and injecting an inert gas into the series fluidized bed for reaction under heating at 600-800 C. for 40-90 min, the ratio of the mass of carbon in the carbon source to the mass of the catalyst being 5-7:3-5. Further provided are a device for preparing a carbon nanotube according to the above method and a carbon nanotube prepared by the above method.

An aspect of the present invention provides an internal and the like. The internal is easily handled and is capable of yielding a satisfactory defoaming effect. An internal (50) is used in a fluidized bed reaction device (1), in which a first material and a second material are brought into contact with each other and reacted with each other. The internal (50) is attached to a ceiling part of the fluidized bed reaction device (1), and includes a plurality of chains (21).

In a method for gas-flow carrying a solid particle, the solid particle includes a solid substance generating a dissociation equilibrium reaction that dissociates at least one type of gas component, and the solid particle is carried by a gas flow containing the gas component. The average particle diameter of the solid particle is preferably 0.1-1.0 mm. The solid particle is preferably carried by the gas flow in the state of a suspended flow, a fluidized flow, or a plug flow. The solid particle preferably includes a solid substance to generate a dissociation equilibrium reaction that dissociates at least one gas component and at least one solid component, and the solid particle is preferably carried by the gas flow in a carrying pipe and the solid particle or the solid component that has adhered to the interior surface of the carrying pipe is removed by the gas flow.

This present disclosure relates to apparatuses for methylation of aromatics in an aromatics complex for producing a xylene isomer product. More specifically, the present disclosure relates to the use of riser slip reduction technology to improve the methanol feed and catalyst contacting which will improve the product yield rate.

A coupling reaction apparatus for heavy oil cracking-gasification, including a cracking section and a gasification section communicated with each other, and the cracking section is located above the gasification section; the cracking section is provided with a heavy oil raw material inlet and a fluidizing gas inlet, and an upper part of the cracking section is provided with an oil-gas outlet; and the gasification section is provided with a gasification agent inlet.

Techniques and systems for reducing fouling in a polymerization system are described. The polymerization system includes a reactor coupled to a recycle system. The recycle system includes at least one fouling-susceptible unit. The technique includes inducing polymerization of a reactant, for example, at least one olefin monomer reactant, with a catalyst in the reactor. The technique may further include circulating a fluidizing stream through the reactor and the at least one fouling-susceptible unit. The fluidizing stream may include entrained particles tending to foul the at least one fouling-susceptible unit. The technique can further include contacting the fluidizing stream with a catalyst poison at at least one location upstream of the at least one fouling-susceptible unit in the recycle system.

According to one or more embodiments disclosed herein, a reactant gas may be converted by a method comprising introducing the reactant gas to a fluidized bed reactor. The main reactor vessel of the fluidized bed reactor may be tapered such that the upstream portion of the main reactor vessel comprises a lesser cross-sectional area than the downstream portion of the main reactor vessel.