Coke drum additive injection

• US 9,969,937 B2
• Filed: 09/18/2013
• Issued: 05/15/2018
• Est. Priority Date: 09/21/2012
• Status: Active Grant

• Current Assignee: Lummus Technology Inc.
• Original Assignee: Lummus Technology Inc.
• Inventors: Faegh, Ahmad
• Primary Examiner(s): Turk, Neil N
• Application Number:
  US14/030,219
• Publication Number:
  US 20140082999A1
• Time in Patent Office: 1,700 Days
• Field of Search: None
• CPC Class Codes: C10B 1/04 Vertical retorts
• CPC Class Codes: C10B 55/00 Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material cracking oils C10G
• CPC Class Codes: C10B 55/02 with solid materials
• CPC Class Codes: C10B 57/06 containing additives
• CPC Class Codes: C10G 11/18 according to the "fluidised-bed" technique
• CPC Class Codes: C10G 9/005 Coking (in order to produce liquid products mainly)

Abstract

A process for producing coke that may include: heating a coker feedstock to a coking temperature to produce a heated coker feedstock; feeding the heated coker feedstock to a coking drum; feeding a coking additive, such as at least one hydroconversion or hydrocracking catalyst, to the coking drum; and subjecting the heated coker feedstock to thermal cracking in the coking drum to crack a portion of the coker feedstock to produce a cracked vapor product and produce a coke product.

Claims

1. A process for producing coke, the process comprising:

heating a coker feedstock to a coking temperature to produce a heated coker feedstock;

mixing the heated coker feedstock and a coking additive comprising at least one hydroconversion or hydrocracking catalyst via a mixing tee to produce a mixture, wherein the mixing tee comprises at least two intersecting flow conduits and an injection nozzle extending into a perpendicular intersection of the at least two intersecting flow conduits,

wherein the mixing comprises passing the heated coker feedstock annularly over the injection nozzle and injecting the coking additive via the injection nozzle into the heated coker feedstock;

feeding the mixture to a bottom head of a coking drum;

subjecting the heated coker feedstock to thermal cracking in the coking drum to crack a portion of the coker feedstock to produce a cracked vapor product and produce a coke product.

2. The process of claim 1, wherein the coke product has a VCM concentration in the range from about 5% to about 50% by weight, as measured by ASTM D3175t.

3. The process of claim 1, wherein the coke product comprises at least one of sponge coke, needle coke, and shot coke.

4. The process of claim 1, wherein mixing the heated coker feedstock comprises

feeding the heated coker feedstock to the mixing tee for a selected time period prior to feeding the coking additive to the mixing tee.

5. The process of claim 1, further comprising admixing the coking additive with a carrier medium.

6. The process of claim 5, wherein the carrier medium comprises a hydrocarbon or a mixture of hydrocarbons.

7. The process of claim 6, wherein the carrier medium comprises a mixture including one or more hydrocarbons having a boiling point in the range from about 500°

F. to about 950°

F.

8. A process for producing coke, the process comprising:

heating a coker feedstock to a coking temperature to produce a heated coker feedstock;

mixing the heated coker feedstock and a coking additive comprising at least one hydroconversion or hydrocracking catalyst via a mixing tee to produce a mixture,

wherein the mixing tee comprises at least two intersecting flow conduits and an injection nozzle extending into a perpendicular intersection of the at least two intersecting flow conduits, and

wherein the mixing comprises passing the heated coker feedstock annularly over the injection nozzle and injecting the coking additive via the injection nozzle into the heated coker feedstock;

feeding the mixture to a bottom head of a coking drum; and

subjecting the heated coker feedstock to cracking in the coking drum to crack a portion of the coker feedstock to produce a cracked vapor product and produce a coke product.

9. The process of claim 8, wherein the coking additive is a solid.

10. The process of claim 8, wherein the coking additive is a slurry.

11. The process of claim 8, wherein the mixing tee is immediately upstream of the coking drum proximate the bottom head of the coking drum.