Lummus Technology Inc.

Stone & Webster Engineering Corp.

Abb Lummus Global Inc.

Dalip Singh Soni

Leonce Francis Castagnos, Jr

Rama Rao Marri

Pramod Kumar

Paul Marchant

Leonce F Castagnos, Jr

Paul E Marchant

A fluid catalytic cracking apparatus and process is disclosed, providing for efficient conversion of heavy hydrocarbon feeds to light olefins, aromatics, and gasoline. A countercurrent flow reactor operating in bubbling or turbulent fluidization regimes is integrated with a fluid catalytic cracking riser reactor. A heavy hydrocarbon feed is catalytically cracked to naphtha and light olefins in the riser reactor, a co-current flow reactor. To enhance the yields and selectivity to light olefins, cracked hydrocarbon products from the riser reactor, such as Cand naphtha range hydrocarbons, may be recycled and processed in the countercurrent flow reactor. The integration of the countercurrent flow reactor with a conventional FCC riser reactor and catalyst regeneration system may overcome heat balance issues commonly associated with two-stage cracking processes, may substantially increase the overall conversion and light olefins yield, and/or may increases the capability to process heavier feedstocks.

Fluid catalytic cracking process and apparatus for maximizing light olefins or middle distillates and light olefins

Fluid cracking process and apparatus for maximizing light olefins or middle distillates and light olefins

An apparatus and method for processing different feeds in a fluid catalytic cracking unit are disclosed which result in improved yields of C, Cand gasoline range hydrocarbons as compared to conventional systems. The process comprises injecting a main hydrocarbon feed into a catalyst-containing riser reactor through a plurality of main feed injectors, and injecting a light hydrocarbon feed into the riser reactor at a location upstream from the main feed injectors and downstream from a control valve such as a regenerated catalyst slide valve, the light feed being injected in a region having a high density of catalyst particles. The light feed is injected in a dispersed way such the amount of feed injected corresponds to the density of catalyst particles at that particular point, with greater amounts of feed being injected at locations having a large number of catalyst particles. Also, a heavy hydrocarbon feed or a heavy recycle stream from the same FCC unit can be injected at the same elevation as the main feed injectors but through separate injectors.

Processing of different feeds in a fluid catalytic cracking unit

An apparatus for the countercurrent contacting of a gas and downflowing solid particles includes a housing and a plurality of baffles positioned within the housing. The baffles are arranged in at least first and second vertically spaced levels in successively lower position, each of the first and second levels including a row of at least two baffles oriented parallel to one another and inclined from horizontal so as to facilitate movement of the solid particles and provide the maximum area for flow. Baffles are oriented so as to laterally shift the direction of downflowing particles transversely as the particles move from one level to the next lower level and avoid channeling of the phases. The number of baffles, length and spacing is optimized to provide maximum interfacial area for interaction between the phases.

Apparatus for countercurrent contacting of gas and solids

A process for transferring and regulating the recycle of particulate solids separated from a gas-particulate solids suspension in which an auxiliary vesssel and slanted pipe are provided to transfer and regulate particulate solids flow.

Process for the return of recovered particulate solids by a cyclone

An apparatus and process for transferring and regulating the recycle of particulate solids separated from a gas-particulate solids suspension in which an auxiliary vessel and slanted pipe are provided to transfer and regulate particulate solids flow.

Growing community of inventors

Houston, TX, United States of America

Dalip Singh Soni