Process and apparatus for fluidized bed hydrocarbon conversion
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United States of America Patent
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Nov 23, 1993
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N/A
app pub date -
Dec 23, 1991
filing date -
Dec 30, 1987
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Abstract
The invention relates to a process for the conversion of petroleum hydrocarbons in the presence of catalyst particles in a fluidized phase in an essentially upflow or downflow tubular reaction zone, said process comprising at least one stage of steam cracking of at least one light hydrocarbon fraction and a stage of catalytic cracking of at least one heavy hydrocarbon fraction. The steam cracking is carried out by contacting the light hydrocarbons and a quantity of steam equal to at least 20 percent by weight in a fluidized bed of the catalyst particles, the resulting temperature ranging from 650.degree. to 850.degree. C. The catalytic cracking of the heavy hydrocarbons is carried out by contacting them with the effluents from the upstream section of the reaction zone and the catalyst suspension in such a way that the temperature of the mixture ranges from 500.degree. to 650.degree. C. and is then reduced to a temperature ranging from 475.degree. to 550.degree. C.
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