# US 4,394,250 A · Delayed coking process

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- Number: US 4,394,250 A
- Document ID: US4394250A
- Status: Granted
- Kind: A
- Application number: 06/341,338
- Filed: 1982-01-21
- Granted: 1983-07-19
- Earliest claimed: 1982-01-21
- Assignees: Chevron Research Company
- Inventors: Arnold L. Grossberg
- Web page: https://patentgrep.com/patent/US4394250A

## CPC

- C10B 57/06: containing additives
- C10B 55/00: Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material (cracking oils C10G)
- C10G 47/00: Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions (C10G15/00 takes precedence; destructive hydrogenation of non-melting solid carbonaceous or similar materials C10G1/06)
- C10B: DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS (cracking oils C10G; underground gasification of minerals E21B43/295)
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

A catalytic delayed coking process is disclosed that gives increased distillate yield and reduced coke make. The process involves adding small amounts of cracking catalyst and hydrogen to the hydrocarbon feedstock before it is charged to the coking drum. The catalyst settles out in the coke and does not affect the utility of the coke.

## Claims

### Claim 1

In a delayed coking process comprising heating a hydrocarbon feedstock to cracking temperatures and thereafter introducing the heated feedstock into a coking drum under delayed coking conditions wherein the heated feedstock soaks in the drum in its contained heat which is sufficient to convert the feedstock to cracked vapors and coke, the improvement comprising adding a cracking catalyst in an amount in the range of about 0.1 to about 3% by weight based on the hydrocarbon feedstock and hydrogen in an amount in the range of about 50 to about 500 SCF per barrel of the hydrocarbon feedstock to the feedstock thereby causing an increase in the distillate yield from the process.

### Claim 2 (depends on 1)

The process of claim 1 wherein the catalyst is added to the feedstock before the feedstock is heated and the hydrogen is added to the feedstock after the feedstock is heated.

### Claim 3 (depends on 1)

The process of claim 1 wherein the feedstock is heated to 850.degree. F. to 1100.degree. F. and the delayed coking conditions are 20 to 200 psig and 800.degree. F. to 1200.degree. F.

### Claim 4 (depends on 2)

The process of claim 2 wherein the feedstock is heated to 850.degree. F. to 1100.degree. F., the delayed coking conditions are 20 to 200 psig and 800.degree. F. to 1200.degree. F., and the catalyst is fluid catalytic cracking fines.