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Synthetic fuel with reduced particulate matter emissions and a method of operating a compression ignition engine using said fuel in conjunction with oxidation catalysts

Inactive Publication Date: 2005-07-14
SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029] According to a further aspect of the invention, there is provided a method of improving the conversion efficiency of oxidation catalysts used in conjunction with compression ignition engines, said method including combusting a compression ignition engine fuel as described above in the compression ignition engine in the presence of said oxidation catalysts and oxygen or an oxygen containing gas.
[0032] According to a further aspect of the invention there is provided a method for operating a compression ignition (CI) engine to produce low particulate emissions, which method comprises combusting a CI engine fuel substantially as described above with oxygen or an oxygen containing gas in a CI engine.

Problems solved by technology

Since it has been demonstrated that the use of synthetic diesel fuels results in lower particulate mass emissions than conventional crude oil-derived diesel fuels, it is possible that the same mechanism may result in higher particle number concentrations being emitted with these fuels.

Method used

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  • Synthetic fuel with reduced particulate matter emissions and a method of operating a compression ignition engine using said fuel in conjunction with oxidation catalysts
  • Synthetic fuel with reduced particulate matter emissions and a method of operating a compression ignition engine using said fuel in conjunction with oxidation catalysts
  • Synthetic fuel with reduced particulate matter emissions and a method of operating a compression ignition engine using said fuel in conjunction with oxidation catalysts

Examples

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example 1

Particle Number Emissions

[0050] For the purposes of comparing particle number emissions and size distributions, a commercially available, low sulphur diesel fuel approved by the US Environmental Protection Agency for on-highway use, was used as the reference fuel. Important characteristics of the two test fuels are presented in Table 3.

TABLE 3Analysis of Test FuelsLow-S DieselSyntheticTestReferenceDieselPropertyMethodFuelFuelSpecific Gravity, 60° F.ASTM D40520.87050.7647Kinematic Viscosity.,ASTM D4453.1992.00740° C. (cSt)Flash Point (° C.)ASTM D938260Cloud Point (° C.)ASTM D2500−19−18Total Sulphur (ppm)ASTM D2622404Distillation (° C.)ASTM D86IBP19616910%22318750%27325190%330312FBP359329Cetane NumberASTM D61341.574.8Total Aromatics (wt. %)ASTM D518638.4Oxygen as Oxygenatesaccording to GC-MSanalysis, (ppm)Oxygen as primaryC12-C24 alcohol (ppm)Oxygen as primaryC7-C12 alcohol (ppm)

[0051] Exhaust particle number emissions and size distributions were measured using two test engines, a ...

example 2

Oxidation Catalyst Performance Tests

[0066] Various exhaust emission tests were carried out to compare a Japanese low sulphur diesel fuel derived from crude oil and GTL diesel fuel, a synthetic compression ignition fuel of the present invention. The tests focused on regulated emissions of hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and particulate matter (PM), as well as carbon dioxide (CO2). The emission tests were performed on a Japanese heavy-duty vehicle, and tests were conducted both with and without an oxidation catalyst fitted in the vehicle exhaust.

[0067] The types of emission tests performed were a Japanese 13 mode steady-state test cycle for heavy-duty engines, and modes 2, 5, and 8 of the Tokyo test cycle, a special test cycle representative of congested traffic patterns encountered in the Tokyo inner city environment.

[0068] The properties of the synthetic diesel fuel used for the tests were typical of diesel produced by low temperature Fischer-Tropsc...

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Abstract

The invention provides a compression ignition engine fuel derived from a Fischer-Tropsch process, which fuel has a generally increasing iso:n paraffins ratio with increasing paraffin carbon number at least between C9 to C18, less than 0.05% m / m sulphur, and less than 10% by mass aromatics. The fuel may have on average more than 0.9 alkyl branches per paraffinic molecule as measured by H+ NMR analysis. The invention also provides a method for operating a compression ignition engine to produce low particulates emissions, which method comprises combusting the fuel with oxygen or an oxygen containing gas in the engine. Yet further the invention provides a method of improving the conversion efficiency of oxidation catalysts used in conjunction with compression ignition engines, said method including combusting the fuel in the compression ignition engine in the presence of said oxidation catalysts and in oxygen or an oxygen containing gas.

Description

RELATED APPLICATIONS [0001] This application is a continuation, under 35 U.S.C. § 120, of International Patent Application No. PCT / ZA03 / 00075, filed on Jun. 6, 2003, under the Patent Cooperation Treaty (PCT), which was published by the International Bureau in English on Dec. 18, 2003, which designates the United States, and claims the benefit of South African Patent Application No. 2002 / 4572, filed on Jun. 7, 2002, and South African Patent Application No. 2003 / 2855, filed on Apr. 11, 2003. All above-referenced prior applications are incorporated by reference herein in their entirety.FIELD OF THE INVENTION [0002] This invention relates to a synthetic compression ignition engine fuel, to a method of making that fuel, and to a method of operating a compression ignition engine using said fuel, and in conjunction with oxidation catalysts. BACKGROUND OF THE INVENTION [0003] It has been stated that the potential impact of a fuel on diesel emissions has been recognized by state and federal ...

Claims

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Application Information

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IPC IPC(8): C10L1/08C10M171/00
CPCC10L1/08
Inventor MYBURGH, IAN STRADLINGSCHABERG, PAUL WERNER
Owner SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD
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