# US 6,284,806 B1 · Water emulsions of Fischer-Tropsch waxes

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- Number: US 6,284,806 B1
- Document ID: US6284806B1
- Status: Granted
- Kind: B1
- Application number: 08/928,237
- Filed: 1997-09-12
- Granted: 2001-09-04
- Earliest claimed: 1997-09-12
- Assignees: Exxon Research & Engineering Co.
- Inventors: Tapan Chakrabarty; Robert J. Wittenbrink; Paul J. Berlowitz; Loren L. Ansell
- Web page: https://patentgrep.com/patent/US6284806B1

## CPC

- C10L 1/32: consisting of coal-oil suspensions or aqueous emulsions {or oil emulsions}
- Y10S 516/924: Significant dispersive or manipulative operation or step in making or stabilizing colloid system
- Y10S 516/928: Mixing combined with non-mixing operation or step, successively or simultaneously, e.g. heating, cooling, ph change, ageing, milling
- Y10T 137/0391: Affecting flow by the addition of material or energy
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Hydrocarbon in water emulsions comprising Fischer-Tropsch process water, at least 20 to about 90 weight percent of a Fischer-Tropsch wax, a first nonionic surfactant having an HLB of at least 11 and a second nonionic surfactant having an HLB less than 11. Said emulsions are liquid at room temperature and pour by ordinary gravity. Also disclosed are methods of making said hydrocarbon in water emulsions.

## Claims

### Claim 1

A hydrocarbon in water emulsion comprising:
Fischer-Tropsch process water;
at least 20 to about 90 weight % of a Fischer-Tropsch derived wax;
from about 2.25 to 5 weight % based on the weight of wax and water of a first nonionic surfactant having an HLB of at least 11; and
from about 0.05 to 5 weight % based on the weight of wax and water of a second nonionic surfactant having an HLB of less than 11; and
wherein said emulsion is liquid at room temperature and pours by ordinary gravity.

### Claim 2 (depends on 1)

The emulsion of claim 1 wherein the first and second surfactants are selected from mono- and dialkyl ethoxylated phenols having from 2 to 20 carbon atoms in the alkyl groups.

### Claim 3

A method of forming a wax in water emulsion having greater than 20 to about 90 wt % Fischer-Tropsch wax comprising:
melting a Fischer-Tropsch wax by heating;
mixing at least 20 to about 90 wt % of the melted Fischer-Tropsch wax with Fischer-Tropsch process water and a first nonionic surfactant having an HLB of at least 11 to produce a pre-emulsion; and
mixing said pre-emulsion with a second nonionic surfactant having an HLB of less than 11 to form a wax on water emulsion; and
wherein said emulsion is liquid at room temperature and pours by ordinary gravity.

### Claim 4 (depends on 3)

The method of claim 3 wherein the first surfactant has an HLB of about 11-15.

### Claim 5 (depends on 3)

The method of claim 3 wherein the second surfactant has an HLB of 8 to less than 11.

### Claim 6 (depends on 3)

The method of claim 3 including heating the water and first nonionic surfactant to about the temperature of the melted Fischer-Tropsch wax before mixing the water and surfactant with the wax.

### Claim 7 (depends on 6)

The method of claim 6 wherein the pre-emulsion is cooled to a temperature below the melting point of the wax.