# US 5,330,970 A · Composition and method for inhibiting coke formation and deposition during pyrolytic hydrocarbon processing

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- Number: US 5,330,970 A
- Document ID: US5330970A
- Status: Granted
- Kind: A
- Application number: 07/861,729
- Filed: 1992-04-01
- Granted: 1994-07-19
- Earliest claimed: 1991-03-27
- Assignees: Betz Laboratories, Inc.
- Inventors: Dwight K. Reid; Daniel E. Fields
- Web page: https://patentgrep.com/patent/US5330970A

## CPC

- C10G 9/16: Preventing or removing incrustation
- 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

Methods and compositions are provided for inhibiting the formation and deposition of pyrolytic coke on metal surfaces in contact with a hydrocarbon feedstock undergoing pyrolytic processing. Coke inhibition is achieved by adding a coke inhibiting amount of a combination of a boron compound and a dihydroxybenzene compound.

## Claims

### Claim 1

A composition for inhibiting the formation and deposition of coke on the heated metal surfaces in contact with a hydrocarbon feedstock which is undergoing pyrolytic processing to produce lower hydrocarbon fractions and said metal surfaces having a temperature of about 1600.degree. F. or higher, which improvement comprises a synergistic combination of a boron compound and dihydroxybenzene compound selected from the group consisting of hydroquinone, resorcinol, catechol, and 4-tert-butyl resorcinol.

### Claim 2 (depends on 1)

A composition as claimed in claim 1 wherein said boron compound is an ammonium borate.

### Claim 3 (depends on 2)

A composition as claimed in claim 2 wherein said ammonium borate is ammonium biborate.

### Claim 4 (depends on 2)

A composition as claimed in claim 2 wherein said ammonium borate is ammonium pentaborate.

### Claim 5 (depends on 1)

A composition as claimed in claim 1 wherein said boron compound is boron oxide.

### Claim 6 (depends on 1)

A composition as claimed in claim 1 wherein said boron compound is sodium borate.

### Claim 7

A composition for inhibiting the formation and deposition for coke on the heated metal surfaces in contact with a hydrocarbon feedstock which is undergoing pyrolytic processing to produce lower hydrocarbon fractions and said metal surfaces having a temperature of about 1600.degree. F. or higher, which improvement comprises a synergistic combination of a boron compound and a dihydroxybenzene compound selected from the group consisting of hydroquinone, resorcinol, catechol, and 4-tert-butyl resorcinol, wherein said boron compound is contained in a glycolic carrier selected from the group consisting essentially of ethylene glycol, propylene glycol, glycerol, hexylene glycols and polyethylene glycols.

### Claim 8

A composition for inhibiting the formation and deposition of coke on the heated metal surfaces in contact with a hydrocarbon feedstock which is undergoing pyrolytic processing to produce lower hydrocarbon fractions and said metal surfaces having a temperature of about 1600.degree. F. or higher, which improvement comprises a synergistic combination of a boron compound and a dihydroxybenzene compound selected from the group consisting of hydroquinone, resorcinol, catechol, and 4-tert-butyl resorcinol, wherein said dihydroxybenzene compound is contained in a co-solvent carrier selected from the group consisting of water:diethylene glycol monobutyl ether and water:ethylene glycol.