# US 4,391,789 A · Carbon black process

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- Number: US 4,391,789 A
- Document ID: US4391789A
- Status: Granted
- Kind: A
- Application number: 06/368,534
- Filed: 1982-04-15
- Granted: 1983-07-05
- Earliest claimed: 1982-04-15
- Assignees: Columbian Chemicals Company
- Inventors: Earl J. Estopinal
- Web page: https://patentgrep.com/patent/US4391789A

## CPC

- C09C 1/50: Furnace black {; Preparation thereof (separation or recovery C09C1/487)}
- B01J 19/00: Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

Disclosed is a method of making a carbon black product having a controllable aggregate particle size distribution comprising forming in a first zone of the carbon black reactor combustion gases at a high temperature and having a gradient of increasing turbulence in the downstream direction, injecting substantially radially into the first zone a carbon black feedstock into more than one of the "zones of increasing turbulence" before the gases reach maximum turbulence, cracking the feedstock to carbon black in a second (reaction) zone, quenching the carbon black reaction, and collecting the carbon black product. Also discussed is a method for making a carbon black product having varying physical characteristics as a result of modifying reaction kinetics at any position of oil injection into the "zones of turbulence".

## Claims

### Claim 1

A method of making a carbon black product comprising:
forming, in a first zone of a Venturi type carbon black reactor wherein the first zone is the converging section of the Venturi type carbon black reactor, combustion gases at a high temperature having a gradient of increasing turbulence in an axial downstream direction, said turbulence resulting from the tangential injection of a fuel and a combustion-supporting gas
injecting, substantially radially into the first zone of the reactor, a carbon black feedstock at more than one of the axial gradient positions before the combustion gases reach maximum turbulence,
cracking the carbon black feedstock into carbon black,
quenching the carbon black reaction in a second zone after said gases have reached maximum turbulence, and
collecting the carbon black product said product having a controlled particle size distribution.

### Claim 2 (depends on 1)

The method of claim 1, wherein an alkaline metal salt is injected into selected feedstock injection positions.

### Claim 3 (depends on 1)

The method of claim 1, wherein oxygen or an oxygen enriched gas is injected into selected feedstock injection positions.