Integrated two stage coking and steam cracking process and appar

Details Integrated two stage coking and steam cracking process and appar Integrated two stage coking and steam cracking process and appar

1981-06-11

1983-04-05

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208127, 208164, 208160, 422145, 422147, C10G 5102, C10G 932, F27B 1508

Patent

active

043790461

ABSTRACT:
The invention relates to an improvement in an integrated, two stage coking and steam cracking process for the production of unsaturated light hydrocarbons. A heavy hydrocarbonaceous oil is first coked in a fluid coking zone. High temperature cracking in the presence of steam is carried out on the vaporous coker conversion product by injecting into the vapors a stream of hot coke particles at a sufficient temperature and in sufficient amount to raise the coker vapors to steam cracking temperature and supply the endothermic heat of reaction. Solids are separated from gas in a gas-solids separation zone such as one or more cyclones and sent to the fluid coking zone and the gas is quenched to stop olefin degradation reactions. According to the improvement, a portion of the separated solids is diverted from entering the fluid coking zone so that the amount of separated solids it receives is only sufficient to satisfy its heat requirement. Solids may be diverted via the cyclone dipleg. An internal standpipe connected to the cyclone dipleg and having a valve and associated riser may be used to regulate the amount of separated solids permitted to enter the fluid coking zone.

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