Back to results
US 5,258,115 AGranted
Delayed coking with refinery caustic
AssigneeMobil Oil Corporation
InventorsRoland H. Heck, Tom Reischman, Gerald J. Teitman, Salvatore T. M. Viscontini
Life of this patent
Estimating the term…
Abstract
A refinery derived spent caustic is recycled by introducing the spent caustic to a delayed coking drum while conducting delayed coking of a hydrocarbon feedstock. The alkali metal containing material accelerates coking, induces production of shot coke, alleviates the problem of a hot drum and reduces drum cooling time.
Claims15
A delayed coking process comprising the steps of
- a) introducing a residuum hydrocarbon fraction coker feed to a coker heater which elevates the temperature of the coker feed to a temperature ranging from about 800.degree. F. to 930.degree. F. necessary to carry out coking of the feed;
- b) adding a spent caustic to the heated coke feed to produce a coker feedstock, the spent caustic is added at a temperature ranging from 70.degree. F. to the temperature of the heated coker feed;
- and
- c) carrying out coking of the coker feedstock in a coker drum at an elevated coking temperature and a slight superatmospheric pressure from which solid coke comprising shot-grade solid coke and liquid coker products are removed.
1 more element
A method of accelerating coking of a residuum hydrocarbon fraction substantially free of excess alkali metals, comprising:
- introducing the residuum hydrocarbon fraction as a coker feed to a coker heater which elevates the temperature of the coker feed to a temperature ranging from about 800.degree. F. to 930.degree. F. necessary to carry out coking of the feed;
- separating a spent caustic from a caustic-treated refined hydrocarbon product by phase separation and water wash to produce a spent caustic which is substantially free of hydrocarbon coke precursors;
- elevating the temperature of the spent caustic to an elevated coking temperature;
- introducing the spent caustic to the heated coker feed to produce a coker feedstock;
- and
- carrying out coking of the coker feedstock in a coker drum at an elevated coking temperature and a slight superatmospheric pressure to produce a highly porous solid coke product comprising shot-grade solid coke.
3 more elements
Dependencies are inferred from the claim text.