Sequential thermal cracking process
AssigneeStone & Webster Engineering Corp.
InventorsAxel R. Johnson, Herman N. Woebcke
Life of this patent
Estimating the term…
Abstract
A process and system for sequentially cracking hydrocarbons in a TRC system. A first hydrocarbon feed is cracked at high severity low residence times and the cracked effluent is quenched by a second hydrocarbon feed which is coincidentally cracked at low severity.
Claims11
In a TRC process wherein the temperature in the reaction chamber is between 1300.degree. and 2500.degree. F. and wherein the hydrocarbon fluid feed or the hydrosulfurized residual oil along with the entrained inert solids and the diluent gas are passed through the reaction chamber for a residence time of 0.5 to 2 seconds, the improvement wherein the step of cracking hydrocarbon feed to produce olefins comprises:
- a. delivering hydrocarbon feed to a first zone;
- b. thermally cracking the hydrocarbons in the first zone at temperatures above 1,500.degree. F.;
- c. discharging the cracked effluent from the first zone to a second zone;
- d. delivering a second hydrocarbon feed to the entry of the second zone;
- and
- e. mixing the cracked effluent from the first zone and the second hydrocarbon feed in the second zone;
- whereby the cracked effluent from the first zone is quenched and the second hydrocarbon feed is cracked at low severity.
Dependencies are inferred from the claim text.