Lead-Free Aviation Fuel

a technology of aviation fuel and lead-free avgas, which is applied in the direction of fuel additives, liquid carbonaceous fuels, petroleum industry, etc., can solve the problems of insufficient octane number, insufficient increase, and inability to solve the problem of preparing lead-free avgas-type aviation fuels with very good combustion characteristics

Inactive Publication Date: 2008-10-09
TOTAL PUTEAUX FR
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]The lead-free aviation fuel composition which is the subject of the invention has a sufficiently high octane number, at least equal to 100, an NCV extremely close to 43.5 MJ/kg, preferably greater than this

Problems solved by technology

As in the case of fuels for land vehicles, administrations are tending to lower the lead content, or even to ban this additive, due to it being harmful to health and the environment.
The problem of preparing lead-free AVGAS-type aviation fuels having very good combustion characteristics was not resolved.
Even if these documents seem to show that these additives lead to an increase in the octane number, this increase remains insufficient.
Moreover, the compatibility of these different additives as regards respect for the environment has not been proved.
But the use of such non-petroleum bases, apart from their price,

Method used

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Examples

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example

[0047]The present example aims to show that starting with the compounds according to the invention alone, taken two-by-two or in mixture with an aromatic amine, in the concentrations claimed in the present invention, it is possible to produce AVGAS type aviation fuels the specifications of which correspond to those required in the standard ASTM 910-4.

[0048]The operation is carried out with one or two bases B1 and B2 the composition of which is given in Table I below.

TABLE INature of basesB1B2Reformate (% wt)8.520Alkylate (% wt)7362.5Isopentane (% wt)18.517.5In each base:Toluene (% wt)4.312.2Iso-octane (% wt)31.439.4MV15 kg / m3699719.3VP kPa50.341.2ASTM D86 (° C.)10%58.367.840%95.999.150%102.0102.290%112.1110.4MP143.9145MON92.393.2PN97.4NCV (MJ / kg) - ASTMD4529*44.043.4VP: vapour pressure of the fuelPN: performance number of the fuel or Performance Number determined on a CFR engine according to the standard ASTM D909 (F4)NCV: net calorific value the minimum level of which aimed at for ...

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PUM

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Abstract

Lead-free aviation fuel composition with a MON greater than 100, made up of a major component of a fuel made from Avgas and a minor component of at least two compounds from the group of esters of at least one mono-or poly-carboxylic acid and at least one mono- or polyol, anhydrides of a least one mono- or poly-carboxylic acid, preferably aromatic ethers at a level of at least 5% w/w and ketones at a level of more than 10% w/w.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a lead-free aviation fuel composition (Avgas), intended for aircraft with piston or reciprocating engines. In particular, a subject of the present invention is a lead-free aviation fuel with a high octane number and having very good combustion characteristics.TECHNOLOGICAL BACKGROUND[0002]Aviation fuel is a product which has been developed with care and subjected to strict regulations which go hand in hand with any aeronautical application. Thus, the preparation of aviation fuels in the refinery is carried out with bases which are characterized both by a narrow distillation range and high octane numbers. These bases are generally constituted by alkylates, reformates and isopentane cuts, the latter being used in low concentrations due to their high volatility.[0003]But before being marketed, aviation fuels must satisfy other precise physico-chemical characteristics, defined by international specifications. Thus, aviation fu...

Claims

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Application Information

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IPC IPC(8): C10L1/189
CPCC10L1/023C10L1/14C10L1/1852C10L1/1857C10L1/188C10L1/1881C10L1/1883C10L1/19C10L1/1905C10L1/191C10L1/223C10L10/00C10L10/04
Inventor DEMOMENT, PASCALEVUILLET, CELINE
Owner TOTAL PUTEAUX FR
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