Clean-burning aviation gasoline additive to eliminate valve seat recession and deposits

a technology of aviation gasoline and additives, which is applied in the petroleum industry, liquid carbonaceous fuels, fuel additives, etc., can solve the problems of limited valve seat recession in engines using such fuels, longer engine life, and longer so as to prolong engine life and prolong engine life. the effect of the time between engine overhauls

Inactive Publication Date: 2020-05-28
SWIFT FUELS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The Additive package described in this patent can prevent or reduce valve seat recession, remove intake deposits, and protect against corrosion and microbial growth in aircraft engines. It also results in less corrosion in engines and oil systems, leading to longer engine life and longer time between overhauls.

Problems solved by technology

Further provided are fuel formulations containing calcium sulfonates, and optionally detergents and other components, which result in limited valve seat recession in the engines using such fuels.
Furthermore, such gasolines, particularly clean-burning gasolines, using this invention result in far less corrosion in the engine and oil system (typically caused by the presence of organometallics) leading to longer engine life and longer time between engine overhauls.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 3

[0043]Aviation gasoline blend comprising at least one C4-C10 aliphatic hydrocarbon and at least one oxygenated compound, with less than 5% arene hydrocarbons and no amines or organometallic compounds, having a motor octane of at least 99.6 MON was tested with a potassium-based anti-VSR additive. The result was a limited level of valve recession, still within tolerance, but sludge and grime were excessive and difficult to remove. Potassium tends to cake-up and form chunks of debris which can be dangerous when dislodged in the combustion or exhaust chamber.

example 4

[0044]Aviation gasoline blend comprising at least one C4-C10 aliphatic hydrocarbon and at least one oxygenated compound, with less than 5% arene hydrocarbons and no amines or organometallic compounds, having a motor octane of at least 99.6 MON was tested with a manganese-based anti-VSR additive (MMT). The result was a limited level of valve recession, but sludge and grime were excessive. Spark plug deposits shut down the engine between regular cleaning intervals. MMT tends to cake-up and form chunks of debris which can be dangerous when dislodged in the combustion chamber.

example 5

Additive

[0045]The response of the Additive package of this invention was tested in several different test engine runs using SAE standard testing for the response of the Additive package. The standard calls for a 250-hour test, with the engine under full load. In total, 13 of these test engines were run the full 250 hours to evaluate additive response. This test was conducted on a nominal blend of 100R, a clean-burning aviation gasoline with 75% aliphatic hydrocarbons and 25% oxygenates (m / m) with the maximum treat rate prescribed by the SPEC-100R-18 specification. In addition, 8 other full runs were conducted with decreasing amounts of the Additive package in this invention.

[0046]The piston engines were purchased new, fully dimensionally measured, and reassembled before the run. Oil was changed initially at 25 hours and thereafter every 50 hours. For comparison of data, 100LL avgas with tetraethyllead and ethanol-free automotive gasoline were each run on a full additive test engine....

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PUM

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Abstract

A fuel additive for fuel formulations comprising calcium sulfonates in an amount effective to limit or eliminate valve seat recession in engines utilizing such fuel formulations. The fuel additive may also include a detergent, particularly in an amount to enhance the VSR limiting effect of the calcium sulfonates. Also included are fuel formulations containing calcium sulfonates in a concentration effective to limit vale seat recession in engines utilizing the fuel formulations. Methods for treating VSR in piston engines are also provided.

Description

FIELD OF INVENTION[0001]Valve Seat Recession (VSR) can occur in any internal combustion engine due to the repetitive impact of the valves in the cylinder, particularly the exhaust valve, contacting the cylinder head socket (valve seat) under intense temperature and pressure over the operating life of a piston engine.BACKGROUND[0002]Combustion of gasoline products in the combustion chamber of a piston engine often results in residue and deposits forming around the intake valve and exhaust port and around the cylinder and piston head. The composition of gasoline typically comprises C7-C10 aromatic hydrocarbons and C4-C12 aliphatic compounds that upon incomplete combustion result in engine deposits and combustion residue.[0003]The cleanest combustion examples, i.e. those unleaded gasolines that contain only C4-C10 aliphatic compounds and high-octane oxygenated compounds (e.g. ETBE, MTBE, TAME, alcohols, etc.), tend to offer much cleaner combustion characteristics due to the presence of...

Claims

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Application Information

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IPC IPC(8): C10L1/24C10L10/04C10L1/183C10L1/30
CPCC10L2230/083C10L2270/023C10L10/04C10L2230/081C10L2250/04C10L2270/04C10L2230/16C10L1/2493C10L2230/18C10L1/2468C10L1/1832C10L1/303C10L1/2437C10L2200/0213C10L1/1608C10L1/223C10L1/226C10L1/221C10L1/14C10L1/234C10L1/143C10L2200/0423C10L1/238C10L10/08
Inventor D'ACOSTA, CHRISALBUZAT, THOMASZINK, JUSTIN D.WEGENHART, BENJAMIN
Owner SWIFT FUELS
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