# US 4,395,326 A · Treatment of coal tar emulsions

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,395,326 A
- Document ID: US4395326A
- Status: Granted
- Kind: A
- Application number: 06/342,210
- Filed: 1982-01-25
- Granted: 1983-07-26
- Earliest claimed: 1980-10-29
- Inventors: Samuel Cukier
- Web page: https://patentgrep.com/patent/US4395326A

## CPC

- C10G 33/04: with chemical means
- 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

The present invention relates to a process for the treatment of stable emulsions of water and quinoline insolubles in coal tar comprising thoroughly mixing the coal tar with at least one of a specific class of surface-active compositions, followed by a separation of water and quinoline insoluble components from the mixture. The invention also relates to a method of eliminating or minimizing the build-up of coal tar-derived deposits on surfaces in contact with the coal tar.

## Claims

### Claim 1

A process for treating a stable emulsion of coal tar material containing water and quinoline insolubles, comprising mixing a surface active composition with said material, so as to facilitate the segregation of at least a portion of at least one of said water and said quinoline insolubles from said mixture, where said surface active composition is chosen from the class of compounds having the general formula CH.sub.3 (CH.sub.2).sub.x CH.sub.2 (OCH.sub.2 CH.sub.2).sub.y OSO.sub.3.sup.- M.sup.+ where the average value of x is in the range 6.5 to 13, y is at least 1.5, and M.sup.+ represents one of sodium and ammonium ions.

### Claim 2 (depends on 1)

A process as defined in claim 1, wherein said segregated portion of at least one of said water and said quinoline insolubles is separated from said mixture.

### Claim 3 (depends on 1)

A process as defined in claim 1, wherein y is at most 6.

### Claim 4 (depends on 1)

A process as defined in claim 1, wherein the average value of x is about 10.

### Claim 5 (depends on 2)

A process as defined in claim 2 wherein said separation is carried out by decantation of said mixture.

### Claim 6 (depends on 2)

A process as defined in claim 2 wherein said separation is carried out by centrifugation of said mixture.

### Claim 7 (depends on 2, 3, 4)

A process as defined in claim 2, 3 or 4 wherein said separation is carried out at a temperature greater than 70.degree. C.

### Claim 8 (depends on 2, 3, 4)

A process as defined in claim 2, 3 or 4 wherein said surface-active composition is added to said coal-tar material in an amount which constitutes between 0.001 and 1% of said coal-tar material.

### Claim 9 (depends on 1)

A process as defined in claim 1, wherein the adhesion of constituents of said coal tar material to contacting surfaces is significantly reduced.

### Claim 10 (depends on 1, 3)

A process as defined in claim 1 or 3, wherein said surface-active composition comprises compounds having branched chain alkyl groups.

### Claim 11 (depends on 1, 3)

A process as defined in claim 1 or 3, wherein said surface-active composition comprises compounds having straight chain alkyl groups.

### Claim 12 (depends on 3)

A process as defined in claim 3, wherein the average value of x is about 10.