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US 7,972,498 B2Granted
Resid processing for steam cracker feed and catalytic cracking
AssigneeExxonMobil Chemical Patents Inc.
InventorsJohn S. Buchanan, Paul F Keusenkothen, Stephen H. Brown, Julian A. Wolfenbarger, James E. Graham, James N. McCoy
Life of this patent
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Abstract
The invention concerns integration of hydroprocessing and steam cracking. A feed comprising crude or resid-containing fraction thereof is treated by hydroprocessing and visbreaking and then passed to a steam cracker to obtain a product comprising olefins.
Claims34
A process for producing olefins comprising:
- (i) hydroprocessing a feed comprising crude comprising resid or a crude fraction comprising resid in a hydroprocessing unit at a temperature sufficient to promote incipient thermal cracking of the resid, wherein the resid includes 1050° F.+(565° C.+) resid;
- (ii) obtaining hydrogenated C2+ effluent from a resid hydroprocessing unit, wherein the effluent comprises resid;
- (iii) separating the effluent in a separator that comprises at least one of a visbreaker, a flash drum, a high pressure separator, and a vapor liquid separator wherein the effluent in the separator is heated at visbreaking conditions to a temperature of at least about 850° F. (454° C.), into an overhead stream and a bottoms stream, the bottoms stream comprising hydroprocessed resid including 1050° F.+ (565° C.+) resid;
- (iv) feeding the overhead stream as vapor to a steam cracker;
- (v) steam cracking the overhead stream and obtaining a steam cracker effluent from the steam cracker comprising olefins;
- (vi) feeding the bottoms stream to a catalytic cracking unit;
- and
- (vii) cracking the bottoms stream in the catalytic cracking unit to obtain a catalytically cracked stream comprising at least one of gas oil and olefins;
- and further comprising flashing the effluent through at least one pressure drop to reduce the pressure of the effluent, prior to or during the step of separating the effluent.
6 more elements
A process for making olefins from a hydrocarbon feed comprising:
- (i) feeding a resid-containing hydrocarbon feed into a hydroprocessing apparatus and hydroprocessing the resid-containing hydrocarbon material to form a hydroprocessed C2+ effluent comprising resid, wherein the resid includes 1050° F.+ (565° C.+) resid;
- (ii) reheating the hydroprocessed effluent in a convection section of a steam cracker;
- (iii) separating a vapor fraction at visbreaking conditions that include a temperature of at least about 850° F. (454° C.) from the reheated effluent of step (ii) in a vapor liquid separator, providing a liquid fraction that comprises resid, including 1050° F.+ (565° C.+) resid;
- (iv) steam cracking the vapor fraction in a steam cracker to create a steam cracker effluent comprising olefins;
- (v) separating the steam cracker effluent to recover at least one of a C2-C6 olefin and a single ring aromatic species;
- (vi) feeding the liquid fraction to a catalytic cracker;
- (vii) cracking the liquid fraction in the catalytic cracker to create a catalytic cracker effluent comprising at least one of olefins and gas oil;
- and
- (viii) separating the catalytic cracker effluent to recover at least one of a C2-C6 olefin and a single ring aromatic species;
- and further comprising flashing the reheated effluent through at least one pressure drop to reduce the pressure of the reheated effluent, prior to or during the step of separating the vapor fraction from the reheated effluent.
7 more elements
Dependencies are inferred from the claim text.