Mineral oils: apparatus – Vaporizing – Tubular
Patent
1989-09-07
1991-03-05
Woodard, Joye L.
Mineral oils: apparatus
Vaporizing
Tubular
196116, C10G 920
Patent
active
049975250
ABSTRACT:
The present invention relates to a process for the preparation of olefins by the cracking of hydrocarbons consisting in passing a mixture of hydrocarbons and steam flowing in a cracking tube disposed inside a radiation zone of a furnace. The process is characterized in that an increase of the cracking temperature of the mixture between the inlet and the outlet of the radiation zone is associated to a non-homogeneous distribution of the thermal power of the furnace, greater at the beginning of the cracking tube than at the end, and to a reaction volume which is greater in the second half of the length tube than in the first one. The present invention relates also to a cracking furnace in which between the inlet and the outlet of the radiation zone the diameter of the cracking tube increases and the thermal power of the burners used to heat the cracking tube decreases. The decreasing thermal power may be applied by arranging burners of different sizes spaced along the cracking tube with the burners of larger size disposed nearer the inlet end of the cracking tube than the burners of smaller size.
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Bellet Serge
Martens Andre
Naphtachimie S.A.
Woodard Joye L.
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