Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1989-12-27
1991-01-29
McFarlane, Anthony
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208160, 208161, 208164, 208150, C10G 1120
Patent
active
049884301
ABSTRACT:
The use of lift gas for FCC risers is improved by the direct use of reactor vapors as the source of the 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 processed for use as lift gas. The only processing requirements are the removal of particulate material and the compression of the gas to pressure conditions at the bottom of the riser. Compression of the gas requires a reduction in its temperature to suitable compressor inlet conditions. This invention is readily practiced in the most recent FCC reactor designs that separate the majority of product vapors from the catalyst in a closed riser cyclone 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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Lomas David A.
Myers Daniel N.
Sechrist Paul A.
McBride Thomas K.
McFarlane Anthony
Phan Nhat
Tolomei John G.
UOP
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