Highly paraffinic, moderately aromatic distillate fuel blend stocks prepared by low pressure hydroprocessing of fischer-tropsch products

a distillate fuel and low pressure technology, applied in the preparation of fuels, oxygen-containing compound preparations, hydroprocessing of distillate fuels, etc., can solve the problems of limiting the use poor seal swell properties of fischer-tropsch distillate fuels, and hydrogen consumption in hydroprocessing of these fuels

Inactive Publication Date: 2007-08-16
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to their highly paraffinic nature, Fischer-Tropsch distillate fuels have problems with poor seal swell properties.
Since the transition from conventional distillate fuels to low aromatic fuels created problems with seal swell, greater seal swell problems associated with the transition to a highly paraffinic distillate fuel component made from a Fischer-Tropsch process are expected.
The greater seal swell problems associated with Fischer-Tropsch distillate fuel components may limit the use of Fischer-Tropsch distillate fuel.
One additional problem associated with highly paraffinic distillate fuels is that hydroprocessing of these fuels consumes hydrogen.
Hydrogen can be expensive to produce and store if necessary.

Method used

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  • Highly paraffinic, moderately aromatic distillate fuel blend stocks prepared by low pressure hydroprocessing of fischer-tropsch products
  • Highly paraffinic, moderately aromatic distillate fuel blend stocks prepared by low pressure hydroprocessing of fischer-tropsch products
  • Highly paraffinic, moderately aromatic distillate fuel blend stocks prepared by low pressure hydroprocessing of fischer-tropsch products

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Diesel Fuel Samples

[0110] A Low Temperature Fischer-Tropsch product was generated by reacting synthesis gas over an iron-containing catalyst. The product was separated into a diesel boiling range blend stock (A) and a wax. The diesel blend stock (A) was hydrotreated to remove oxygenates and saturate olefins. The wax was hydrocracked over a sulfided catalyst consisting of amorphous silica-alumina, alumina, tungsten and nickel. A second diesel blend stock (B) was recovered from the effluent of the hydrocracker. The two diesel blend stocks were blended in the proportion of 82% B and 18% A by weight. Properties of the Fischer-Tropsch (FT) diesel fuel blend are shown in Table I.

TABLE IProperties of Fischer-Tropsch Diesel Fuel BlendFischer-ASTM D975TropschTESTSSPECIFICATIONSDiesel BlendAPI GRAVITY, 60° F.40(min.)52.3NITROGEN, NG / UL0.69CETANE INDEX ASTM D61372.3NORMAL / NON-NORMALPARAFFINS WT. %NORMAL PARAFFINS17.24NON NORMAL PARAFFINS82.76DISTILLATION D86, ° F. IBP33310%5...

example 2

Preparation and Evaluation of Blends of Fischer Tropsch Diesel with Alkylaromatics and Alkylcycloparaffins

[0111] Blends of a light alkylaromatic (cumene) or alkylcycloparaffin (isopropylcyclohexane) with a Fischer Tropsch diesel fuel blend stock were prepared. The improvement in the seal swell and lubricity were determined along with the decline in cetane index. A preference for alkylaromatics or alkylcycloparaffins can be determined by finding which species gives the greatest improvement in seal swell with the least decline in cetane index. The cetane index in these experiments was determined from a D2887 distillation, converted to D86 equivalent, molecular weight and density at 20° C. This method provides an acceptable and reproducible measurement of the cetane index.

The seat swell test followed ASTM D471:

[0112] O-ring type: Buna N O-ring, size 2-214; vendor: McDowell & Co. [0113] Test Temperature: ambient 23+ / −2° C. [0114] Test Duration: 70 hours [0115] Test sample size: 100...

example 3

[0120] A light Fischer-Tropsch wax (Table III) was hydrocracked over a sulfided nickel-tungsten / silica-alumina catalyst LHSV 1 hr−1, 1000 psig, 685° F., and 6.3 MSCF / bbl. At these conditions, conversion below 650° F. was 80.4 weight %. The liquid product was cut at about 350° F. and about 675° F. to give a diesel blend stock fraction. Yields and properties of the diesel blend stock are given in Table IV.

TABLE IIIFEEDSTOCK INSPECTIONS OF LIGHT FT WAXGravity, API42.5Nitrogen, ppm3.2Sim. Dist., LV %, ° F.ST / 5728 / 77110 / 30789 / 8115083970 / 90858 / 88595 / EP898 / 943

[0121]

TABLE IVHYDROCRACKING OF LIGHT FT WAX OVERNi—W—SIO2—AL2O3 AT LHSV 1 hr−1, 685° F.,1000 PSIG, AND 6.3 MSCF / BBLConversion 80.4Yield, Weight %C1-C20.03C3-C45.06C5-180° F.17.77180-350° F.20.85350-650° F.37.51650° F.+19.71C5+95.49350-675° F. PropertiesWeight % of Feed52.9Gravity, API50.7Viscosity, 40° C., cSt2.631Cloud Point, ° C.−26SFC Analysis, Wt %Aromatics0.3Olefins0.8OxygenatesSaturates98.9PNA Aromatics, weight %Not DetectedCe...

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Abstract

The invention relates to a distillate fuel comprising a highly paraffinic, moderately aromatic distillate fuel blend stock. The highly paraffinic, moderately aromatic distillate fuel blend stock exhibits excellent combustion properties in diesel and jet engines as a result of the high paraffin content. In addition, the highly paraffinic, moderately aromatic distillate fuel blend stock exhibits improved seal-swell characteristics as a result of the moderate aromatic content. The blend stock is preferably prepared from a Fischer-Tropsch derived product that is hydroprocessed under conditions during which a moderate amount of aromatics are formed.

Description

RELATED APPLICATIONS [0001] The present application is a continuation-in-part of U.S. application Ser. No. 09 / 999,667, “Distillate Fuel Blends from Fischer Tropsch Products with Improved Seal Swell Properties,” filed Oct. 19, 2001, the contents of which are hereby incorporated by reference. The present application is also related to U.S. Patent Application No. ______ (Docket No. 005950-830) entitled “Stable, Moderately Unsaturated Distillate Fuel Blend Stock Prepared by Low Pressure Hydroprocessing of Fischer Tropsch Products,” filed herewith.FIELD OF THE INVENTION [0002] The invention is directed to distillate fuels comprising a Fischer Tropsch distillate fuel blend stock, which have improved seal swell properties. BACKGROUND OF THE INVENTION [0003] Distillate fuel derived from the Fischer-Tropsch process is highly paraffinic and has excellent burning properties and very low sulfur. This makes Fischer-Tropsch products ideally suited for fuel use where environmental concerns are imp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/04C10G65/02C10G69/02C07C1/00C07C27/00C10L
CPCC10G2400/04C10L1/08C10L1/04C07C1/00C07C27/00
Inventor MILLER, STEPHEN J.O'REAR, DENNIS J.
Owner CHEVROU USA INC
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