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Antifreeze for Jet Fuel

06/03/2009 5:08 AM

Now a days almost all the modern aircrafts are using JP8 fuel, which is containing a package of additives, one these additives is DiEGME (Di Ethelene Glycol Monomethyl Ether. I wonder If someone could help and let me know the posibility and process to derive Diegme from DEG (DiEthelene Glycol).

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#1

Re: Antifreeze for Jet Fuel

06/05/2009 6:40 PM

not the way to make it.

The subject chemical is NOT an antifreeze for jet fuel, but inhibits the formation of ice crystals in the fuel. Those solid particles would plug fuel filters and the very fine metering passages in the fuel control and vaporization equipment. It has been used for at least 5 decades now in ALL commercial jet fuels and all JP-4 and JP-5 military fuels as well. It is often added to the fuel right at the aircraft wing to ensure its presence, since any bulk water in the fuel will 'wash out' all the anti-icing inhibitor 'AII' as it is often called. Several aircraft losses, and numerous engine flame-outs were atributed to fuel icing before use of fuel icing inhibitors became mandatory for commercial aviation flights,and then the Military also required it.

Jet-A (kerosene), JP-5 (high flash point kerosene) and JP-8 (high temperature stability low volatility kerosene, initially Top Secret and used for the SR-71 only) are usually 'water washed' in the refining process to ensure cleanliness and freedom from particulates. Sometimes as much as 1-2% clean water is added to the product as it flows to storage tanks. Most of the water settles out in tankage and is periodically drained from the storage tanks. This is done to continually 'flush' the bottom interface (fuel:water) to keep bacterial scum from establishing a foothold and living at that interface,eventually getting into the fuel distribution system and creating all kinds of filter plugging and corrosion problems. Thus av-jet is saturated with water at ambient (70F) temperatures. As it cools in aircraft wings (or ground storage and handling systems) some of the water precipitates out into a water phase. If the icing-inhibitor was not present, those small water drops would freeze when the fuel cools to below 32F (outside air just 0.030" of aluminum away is -70 F). Solid water droplets (ice) would plug the fuel filters quickly and cause an engine to shut down. Not good.

You CAN find out the methods to manufacture the chemical. Perform a Google of Worfram alpha search on the name.

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Keith E Bowers, PMP
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#2
In reply to #1

Re: Antifreeze for Jet Fuel

06/06/2009 3:36 AM

Hi Keith,

I must apprciate your understanding and expertise on the fuels. The Pakistan Air Force lost almost 40 Mirages due to flameout of engines and only three back started using JP8. I tried to find out the manufacutring process but couldn't get right one, I request if its possible for you to send me the link of the website where I could learn the process.

Once again I thank you for your help.

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#3

Re: Antifreeze for Jet Fuel

06/06/2009 12:56 PM

If I remember correctly, the Mirage engines were developed for JP-4, and while they would probably run OK on JP-5, flame-outs at high altitude would be problematic and air restart not likely. JP-8 is a non-starter for those engines--but their manufacturer should be consulted for the right way to modify them ,if it is possible. I would not want to ride a fighter jet running JP-8. It is real hard to re-light.

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Keith E Bowers, PMP
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#4

Re: Antifreeze for Jet Fuel how made

06/06/2009 1:04 PM

http://www.advancepetro.com/dgmme.htm this web site provides specification of the product, alternative uses, and a very brief chemical reaction route. I donot know any more specifics about reaction conditions, molar ratios needed, pressures, temps,catalysts, purification process steps etc. Union Carbide is the best source for those perhaps.

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Keith E Bowers, PMP
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