Aviation gasoline for aircraft piston engines, preparation process thereof
AssigneeTotal Marketing Services
InventorPascale Demoment
Life of this patent
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Abstract
The subject of the present disclosure is an aviation gasoline composition that is lead-free and free of oxygenated compounds meeting the specifications of the ASTM standard comprising isopentane, isooctane, and (alkyl)aromatics. The aviation gasoline composition according to the disclosure may be obtained simply and economically from a mixture of hydrocarbon bases usually available in a refinery.
Claims9
A lead-free aviation gasoline (AVGAS) having a Motor Octane Number (MON) comprised between 91 and 92.1 and without any oxygenated compound, the aviation gasoline being prepared by mixing of:
- 10 to 20% by volume of at least one isopentane cut B1:
- 62% to 88% by volume of at least one aviation alkylate base B2 essentially consisting of isoparaffins comprising 6 to 9 carbon atoms;
- and
- 1 to 22% by volume of at least one base of the aviation reformate type B3 essentially consisting of one of:
- alkylaromatics and aromatics, the mixture yielding a composition consisting essentially of:
- from 10 to 22% by volume of isopentane (2-methyl-butane);
- from 30 to 32% by volume of isooctane (2,2,4-trimethyl-pentane);
- from 1.8 to 20% by volume of aromatics including 1 to 10% by volume of toluene;
- and
- up to 100% by volume of components(s) selected from:
- C4-C5 isoparaffins other than isopentane,
- C6-C9 isoparaffins other than isooctane and
- paraffins, iso-and n-paraffins other than isopentane and isooctane;
- less than or equal to 500 ppm of sulphur, the sulpher content being measured according to the ASTM D1266 or ASTMD2622 standard;
- and
- less than 1000 PPM of at least one additive selected from:
- antioxidants, anti-icing agents, antistatic additives, corrosion inhibitors/lubricating power enhancer, agents enhancing cold properties, tracer additives, coloring agents, detergents and mixtures thereof;
- and containing not more than 1% of triptane (2, 2, 3-trimethyl-butane) and not more than 4% of 2, 2, 3-trimethyl-pentane.
A lead-free aviation gasoline (AVGAS) having a Motor Octane Number (MON) comprised between 91 and 92.1, and without any oxygenated compound, the aviation gasoline being prepared by mixing of:
- 10 to 20% by volume of at least one isopentane cut B1;
- 62 to 88% by volume of at least one aviation alkylate base B2 essentially consisting of isoparaffins comprising 6 to 9 carbon atoms;
- and
- 1 to 22% by volume of at least one base of the aviation reformate type B3 essentially consisting of one of:
- alkylaromatics and aromatics, the mixture yielding a composition consisting essentially of:
- from 10 to 22% by volume of isopentane (2-methyl-butane);
- from 30 to 32% by volume of isooctane (2,2,4-trimethyl-pentane);
- from 1.8 to 20% by volume of aromatics including 1 to 10% by volume of toluene;
- at least one additive selected from:
- antioxidants, anti-icing agents, antistatic additives, corrosion inhibitors/lubricating power enhancer, agents enhancing cold properties, tracer additives, coloring agents, detergents and mixtures thereof;
- up to 100% by volume of component(s) selected from:
- C4-C5 isoparaffins other than isopentane,
- C6-C9 isoparaffins other than isooctane and
- paraffins, iso- and n-paraffins other than isopentane and isooctane;
- and containing not more than 1% of triptane (2,2,3-trimethyl-butane) and not more than 4% of 2,2,3-trimethyl-pentane.
Dependencies are inferred from the claim text.