Process for the manufacture of olefins by a pyrolysis furnace with an internally finned U shaped radiant coil
AssigneeExxonMobil Chemical Patents Inc.
InventorsArthur R. Di Nicolantonio, David B. Spicer, Victor K. Wei
Life of this patent
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Abstract
The present invention is directed towards a fired heater for heating a process fluid that uses U tubes provided with increased internal heat transfer surface to reduce tube metal temperatures and coking. and at the same time is not prone to plugging from coke. The fired heater comprises a radiant section enclosure with a number of U tubes in the radiant section. The U tubes are formed by connecting one or more tubular sections, and the U tubes are provided with internal generally longitudinal fins. The invention also is directed towards a process utilizing a fined heater with U tubes as disclosed for producing olefins from hydrocarbon feedstocks.
Claims28
A process for the manufacture of olefins comprising:
- (a) introducing a hydrocarbon feedstock into a radiant section comprising a plurality of U tubes, wherein each U tube has internal generally longitudinal fins over its entire length and an inside diameter of from about 125 inches to about 3.0 inches;
- and
- (b) heating the radiant section to convert the hydrocarbon feedstock to a thermally cracked product.
A process for the manufacture of olefins comprising:
- (a) preheating a hydrocarbon feedstock;
- (b) introducing a hydrocarbon feedstock into a radiant section comprising a plurality of U tubes, wherein each U tube has internal generally longitudinal fins over its entire length and an inside diameter of from about 1.25 inches to about 3.0 inches;
- (c) heating the radiant section to convert the hydrocarbon feedstock to a thermally cracked product;
- (d) collecting the thermally cracked product from the radiant section;
- (e) cooling the thermally cracked product;
- and
- (f) recovering at least one olefin from the thermally cracked product.
Dependencies are inferred from the claim text.