Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1990-11-13
1992-08-25
Myers, Helane E.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208120, 208150, 208160, 208161, 208164, C10G 1120
Patent
active
051416255
ABSTRACT:
The use of lift gas for FCC risers is improved by the direct use of stripping vapors from a second stage of catalyst stripping as a lift gas. Reactor vapors recovered primarily from the stripping section of an FCC reactor/regenerator section provide an excellent source for lift gas material. These reactor vapors contain high concentrations of light paraffinic materials often with an equal weight percent amount of steam. The recovery of the stripping vapors independent from the product stream allows such gaseous mixtures to be readily used as lift gas. The lift gas material is obtained from a stripping section located subadjacent to a regenerator section so that it will have adequate pressure for use as a lift gas stream. The relatively high pressure of the lift gas stream eliminates processing requirements that would otherwise be necessary for the removal of particulate material and the compression of the gas to the pressure conditions at the bottom of the riser. This invention is readily practiced in the most recent FCC reactor designs that separate the majority of product vapors from the catalyst in a first or preliminary stripping arrangement. This invention is particularly suited for use in conjunction with hot catalyst stripping. Hot catalyst stripping produces a high concentration of very low molecular weight gas components in the effluent from the hot stripping zone which are highly suitable for use as lift gas material.
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McBride Thomas K.
Myers Helane E.
Tolomei John G.
UOP
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