A process and reactor for contacting a feed stream with a catalyst stream comprises a reaction chamber comprising two spent catalyst inlets for delivering two spent catalyst streams to the reaction chamber and at least one regenerated catalyst inlet for delivering a regenerated catalyst stream to the reaction chamber. The reaction chamber may also include a second regenerated catalyst inlet for delivering a second regenerated catalyst stream to the reaction chamber. The second spent catalyst inlet enables thorough mixing of catalyst streams.

Bubble column reactor assemblies are provided, an assembly (100) comprising: a reactor vessel (102) comprising a bottom end and a top end. A pre-distributor plate (114) having a bottom surface and a top surface, disposed in the 5 reactor vessel (102) such that the bottom surface faces the bottom end of the reactor vessel (102). A gas distributor (106) is disposed below the pre-distributor plate (114) to receive and inject gas into a liquid prior to distribution of gas and liquid by the pre-distributor plate (114). The gas distributor (106) comprises: a common manifold (108) and a plurality of ring-shaped pipes disposed along a length of the 10 common manifold (108); and a plurality of nozzles disposed along an outer circumference of each ring-shaped pipe of the plurality of ring-shaped pipes to inject gas and create vortexes for uniform distribution of the gas in the liquid.

A method and device for building an oligonucleotide on a solid phase resin within a filter reactor, wherein the method and device as used as a solid phase synthesis system. As part of the solid phase synthesis process, a protecting group will be removed from the 5′ position of an oligonucleotide that is attached to the solid phase resin and then an activated amidite (phosphoamidite) solution is added. The activated amidite solution flows up and down, or fluidizes and mixes with the resin beads within the bed reactor and reacts at the 5′ position of the oligonucleotide, wherein the phosphorous linkage found within the amidite comprises a P atom that is in an oxidation state of III. Once the activated amidite solution has been reacted, the P atom is converted from an oxidation state of III to an oxidation state of V. Any of the reactions including deblocking, coupling, oxidation, sulfurization, or capping can be fluidized or mixed to get complete contacting between the reagents and the resin. Reagents drain from the reactor out the filter bottom before washing. The resin bed is flat and channel free because of the fluidization or mixing prior to the washes and can be re-fluidized during any of the washes. A spray cone or other distributor evenly spreads reagents or wash solvents onto the top of the resin bed without disrupting the flat even spread of resin in the radial direction. Washing after any given reaction can be divided into several individual segments. The cleaner portion of washes after a particular reaction in one cycle, can be collected in a holding vessel and used as the first washes after reaction in the next cycle. In-process integrated multi-pass washing can be used to enable more efficient use of the wash solvent. Excess reagent solution used for deblocking reaction is recycled and reused from one phosphoramidite cycle to the next, making the use of deblocking more efficient.

A fluidized bed processing system include a vessel having a vessel wall and a plurality of chemical feed distributors coupled to the vessel wall and extending into an internal volume of the vessel. Each of the chemical feed distributors includes a distributor body forming a chemical feed flow path and a plurality of chemical feed outlets. The fluidized bed processing system further includes at least one intermediate beam having at plurality of slots spaced apart along a beam length. That intermediate beam is coupled to the vessel wall at both ends, each chemical feed distributor passes through one slot of the intermediate beam, and the intermediate beam provides vertical support for each of the plurality of chemical feed distributors. The fluidized bed processing system can include lateral guides. The intermediate beams and lateral guides support the chemical feed distributors vertically and laterally.

Disclosed are a reaction tower, a production system, and a production method for producing potassium manganate. The reaction tower includes a reaction tower body and a bubble generator. The reaction tower body has a reaction chamber. The bubble generator includes an outer housing. The outer housing is disposed in the reaction chamber and has a gas flow channel therein. The outer housing is configured to direct an external reactant gas into the gas flow channel. The outer housing is provided with multiple first pores each having a diameter less than 10 mm, via which the gas flow channel communicates with the reaction chamber. The reaction tower is used in the production system. The reactant gas is introduced into the reaction chamber in the form of small bubbles by the action of the bubble generator, to increase the area of contact of the reactant gas with manganese ore powder and lye.

The present disclosure relates to methods for controlling gas phase polymerization reactors. A method for controlling a fluidized bed reactor can include forming a fluidized bed in a reactor followed by discharge of polymer product from the reactor to a product discharge tank. The polymer product can then be discharged from the product discharge tank to a blow tank and the pressure of the blow tank is measured. The pressure measured in the blow tank can then be used to control the reactor by changing one or more reactor operating inputs based on the measured blow tank pressure.

A system and a method for catalytically cracking hydrocarbons. The system includes a fluidized bed riser reactor, and a separation zone configured to separate the effluent from the riser reactor to produce a product stream and a spent catalyst. A stripping zone is fluidly coupled to the outlet of the separation zone such that the spent catalyst is stripped to remove the hydrocarbons adsorbed thereon. The stripping zone encompasses at least a portion of the riser reactor such that stripping internals in the stripping zone are used to provide reaction heat to the riser reactor.

A multi-zoned fluidized bed reactor system may include a multi-zoned fluidized bed reactor and at least one catalyst regeneration loop. The multi-zoned fluidized bed reactor comprising a housing, a fluid bed distributor plate positioned at the bottom of the housing, a fluidized catalyst bed disposed vertically above the fluid bed distributor plate and a condensation zone disposed vertically above the fluidized catalyst bed. The at least one catalyst regeneration loop may be fluidly coupled to the stripping zone and a reaction zone. The at least one catalyst regeneration loop may be operable to withdraw a portion of spent catalyst from the stripping zone, regenerate the portion of spent catalyst to produce regenerated catalyst, and return the regenerated catalyst to the reaction zone. A method of regenerating catalyst in a multi-zoned fluidized bed reactor may include passing a portion of spent catalyst from a stripping zone to a catalyst regeneration loop.

In the present invention, only low-growth carbon nanotubes are selectively separated among solid particles discharged during a reaction and then re-input to a reactor, so that it is possible to improve the quality of a carbon nanotube product to be produced and the productivity of a carbon nanotube production process.

The instant disclosure provides a composition for fluid catalytic cracking of petroleum based feedstock into useful short chain olefins. The composition comprising: 76-86% of a non-zeolitic material; and 2-30% of at least one zeolite material, the percentage being based on weight of the catalyst composition, wherein one of the zeolites has been modified with 0.1-2.5 wt % metal. The said catalyst was found to be selective in enhancing the usable propylene gas content, while reducing the undesirable dry gas content of the cracked olefinic products. The present disclosure also provides a process for the preparation of the composition. The present disclosure also provides an apparatus (100) and process (200) for fluid catalytic cracking to obtain light olefins. The apparatus comprises a second riser (33) that includes a lower dense riser (2) and upper dilute riser (3). Further, the lower dense riser (2) has a diameter that is 1.1 to 2 times that of the upper dilute riser (3).