Patent EA-000692-B1 (EA)
Title: Method for increasing yield of liquid products in a delayed coking process
Inventor: ROTH JIM R
IPC: C10G9/14
Filed: 1997-02-07
Abstract: 1. A delayed coking process in which a liquid coking feedstock is heated to an elevated temperature and is charged to a coking drum under delayed coking conditions wherein such liquid feedstock soaks in its contained heat which is sufficient to convert the feedstock to cracked vapors, which cracked vapors upon cooling are condensed to liquid products, and coke, the improvement which comprises introducing to the coking drum a non-coking hydrocarbon diluent having a heat content which is sufficient to increase the temperature level of the liquid feedstock in the coking drum whereby liquid products from the coking process are increased and coke product is decreased. 2. A process as described in claim 1 wherein the temperature increase in the coke drum contents is at least 0,56 degree C (1 degree F). 3. A process as described in claim 2 wherein the temperature increase is at least 5,6 degree C (10 degree F). 4. The process of claim 3 in which one of the liquid products from the coking process is a heavy gas oil which may be recycled at least in part to the coking process. 5. The process of claim 4 in which the coking feedstock is combined with a non-coking hydrocarbon diluent which is a non-coking hydrocarbon diluent having a boiling range which at least in part is less than the boiling range of the heavy gas oil. 6. The process of claim 5. in which the non-coking hydrocarbon diluent at least in part is one of the liquid products from the coking drum. 7. The process of claim 5 in which heavy gas oil is recycled to the coking process to form at least a part of the heated non-coking diluent. 8. The process of claim 5 in which heavy gas oil and non-coking hydrocarbon diluent are recycled at least in part as heated non-coking hydrocarbon diluent to the coking process. 9. The process of claim 5 in which no recycle is used in the coking process and all heated non-coking hydrocarbon diluent is obtained outside of the coking process. 10. A delayed coking process in which a heavy liquid hydrocarbon oil is heated to between about 441 to about 593 degree C (825 degree F and about 1100 degree F) and introduced to a coking drum wherein such liquid feedstock soaks in its contained heat at a temperature between about 427 to about 538 degree C (800 degree F and about 1000 degree F) and a pressure between about 10 psig and about 200 psig to convert the feedstock to vapors, which upon cooling are condensed substantially to liquid products, and coke, and wherein one of the liquid products is a heavy gas oil, at least a portion of which is recycled to the process, the improvement which comprises introducing to the coking drum a non-coking hydrocarbon diluent which has been heated to provide a heat content which is sufficient to increase the temperature of the liquid feedstock in the coking drum at least 0,56 degree C (1 degree F) whereby liquid products from the coking process are increased and coke product is decreased. 11. The process of claim 10 in which the non-coking hydrocarbon diluent is at least in part obtained from one of the liquid products from the coking process. 12. The process of claim 1 in which the non-coking hydrocarbon diluent is heated to a temperature between about 5,6 to about 167 degree C (10 degree F and about 300 degree F)above the temperature of the liquid in the coke drum. 13. The process of claim 12 in which the non-coking hydrocarbon diluent has a boiling range which at least in part is less than the boiling range of the heavy gas oil. 14. The process of claim 13 in which the boiling range of the non-coking hydrocarbon diluent is between about 168 to about 454 degree C (335 degree F and about 850 degree F).