# US 7,608,181 B2 · Distillate fuel blends from Fischer Tropsch products with improved seal swell properties

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- Number: US 7,608,181 B2
- Document ID: US7608181B2
- Status: Granted
- Kind: B2
- Application number: 11/057,470
- Filed: 2005-02-15
- Published: 2005-07-07
- Granted: 2009-10-27
- Earliest claimed: 2001-10-19
- Assignees: Chevron U.S.A. Inc.
- Inventors: Dennis J. O'Rear
- Web page: https://patentgrep.com/patent/US7608181B2

## CPC

- C10L 1/08: for compression ignition
- C10G 2/32: {with the use of catalysts}
- C10G 2400/04: Diesel oil
- Y10S 208/95: Processing of "fischer-tropsch" crude
- 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
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The invention provides distillate fuel blend components with improved seal swell and lubricity properties obtained from Fischer Tropsch products. The blends contain a highly paraffinic distillate fuel component and distillate-boiling alkylcycloparaffins and/or distillate-boiling alkylaromatics. The invention further provides processes for obtaining such blends using the products of Fischer Tropsch processes. Finally, the invention provides methods for improving seal swell and lubricity properties for distillate fuels.

## Claims

### Claim 1

A distillate fuel blend with improved seal swell properties comprising:
a) at least one highly paraffinic distillate fuel component having a branching index of less than about 5, and a volume increase of less than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal; and
b) about 5 wt % to about 20 wt % of at least one component selected from the group consisting of alkylaromatics, alkylcycloparaffins and combinations thereof,
wherein the blend exhibits a volume increase of more than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.

### Claim 2 (depends on 1)

The distillate fuel blend according to claim 1 wherein the distillate fuel blend exhibits a volume increase of more than about 0.5% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.

### Claim 3 (depends on 1)

The distillate fuel blend according to claim 1 wherein the distillate fuel blend exhibits a volume increase of more than about 1.0% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.

### Claim 4 (depends on 1)

A distillate fuel blend component according to claim 1 wherein the alkylaromatics comprise alkylbenzenes.

### Claim 5 (depends on 1)

A distillate fuel blend component according to claim 1 wherein the alkylcycloparaffins are selected from the group consisting of alkylcyclohexanes, alkylcyclopentanes, and mixtures thereof.

### Claim 6 (depends on 1)

A distillate fuel blend component according to claim 1 further comprising an antioxidant selected from the group consisting of an alkylated phenol, a sulfur-containing component and combinations thereof wherein when the antioxidant is a sulfur-containing component, the distillate fuel blend contains more than about 1 ppm sulfur.

### Claim 7 (depends on 1)

A distillate fuel blend according to claim 1 which conforms to the specifications of either a diesel libel or a jet libel.

### Claim 8 (depends on 1)

A distillate fuel blend according to claim 1 wherein the highly paraffinic distillate libel component comprises more than about 70 wt. % paraffins.

### Claim 9 (depends on 1)

A distillate fuel blend according to claim 1 wherein the blend has an improved lubricity according to ASTM D6078 of 225 grams or more.

### Claim 10

A distillate fuel blend with improved seal swell properties comprising:
a) at least one highly paraffinic distillate libel component having a branching index of less than 5, and a volume increase of less than about 0.5% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal; and
b) about 5 wt % to about 20 wt % of at least one component selected from the group consisting of alkylaromatics, alkylcycloparaffins and combinations thereof,
wherein the blend exhibits a volume increase of more than about 0.5% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.

### Claim 11 (depends on 10)

The distillate fuel blend according to claim 10 wherein the highly paraffinic distillate fuel has a branching index of less than about 4.

### Claim 12 (depends on 10)

The distillate fuel blend according to claim 10 wherein the highly paraffinic distillate fuel has a branching index of less than about 3.

### Claim 13 (depends on 10)

The distillate fuel blend according to claim 10 wherein the distillate fuel blend has an improved lubricity according to ASTM D6078 of 225 grams or more.

### Claim 14 (depends on 1)

The distillate fuel blend according to claim 1, wherein the ratio of alkylaromatics to alkylcycloparaffins is about 0.25 to 1.0.

### Claim 15 (depends on 10)

The distillate fuel blend according to claim 10, wherein the ratio of alkylaromatics to alkylcycloparaffins is about 0.25 to 1.0.