Does an additive exist to decrease the freezing point of jet fuel? I have found an additive that decrease the freezing point generated by drops of water (appears between 0 and -10°C), but I'm needing to reduce the freezing of the fuel (-45°C).
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2$\begingroup$ Jet A freeze at -40 C. Jet A-1 freeze at -47 C. Maybe just switch to jet A-1? en.wikipedia.org/wiki/Jet_fuel $\endgroup$– vasin1987Oct 11, 2018 at 18:46
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$\begingroup$ Isn't stuff called Prist used to prevent freezing? en.wikipedia.org/wiki/Fuel_system_icing_inhibitor $\endgroup$– CrossRoadsOct 11, 2018 at 19:00
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1$\begingroup$ You may want to elaborate a bit on your use case to help us out. Jet fuel already has a pretty low freezing point and airplanes have no problem keeping it liquid throughout a flight. Spacecraft generally solve the issue with tank insulation which may be of interest to you. $\endgroup$– DaveOct 12, 2018 at 0:01
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$\begingroup$ Concur with @vasin1987, Switch to Jet A-1 and problem solved. $\endgroup$– Juan JimenezOct 12, 2018 at 7:52
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2 Answers
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There is an additive known as a Fuel System Icing Inhibitor (FSII), it is designed to be mixed with the fuel of non-fuel heated aircraft i.e military. Mixed in at about 0.10-0.15% is optimal to reduce the formation of ice crystals, which will stop it freezing.
Source: http://www.advancepetro.com/fsii.htm
Alternatively, Jet A-1 fuel has a freezing point of -47°C, which is below your threshold and could be useful. Or if Jet A-1 is unavailable you could try Jet B which has a lower freezing point of -60°C, but is more dangerous to handle, and is less prevalent and hence unavailable at many locations.
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$\begingroup$ anti icing is clearly a different thing. more to prevent the water content from icing, not prevent the fuel content from freezing. $\endgroup$ Oct 13, 2018 at 20:47
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$\begingroup$ It was also mentioned somewhere around here that some newer engines are not allowed to be used with Jet-B. $\endgroup$ Oct 14, 2018 at 9:14
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$\begingroup$ Welcome to Av.SE. There is also JP-4 that can go down to -57°C. JP-8 is Jet A-1 plus more additives that may have better availability in the US than Jet A-1. $\endgroup$– OSUZorbaOct 15, 2018 at 1:52
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Question to Wehrner von Braun: "Why did you name it Saturn?". Answer: "It was the one after Jupiter!"
The lower freezing jet fuel is Jet B.
Jet fuel (kerosene) is taken from a higher boiling fraction than "naphtha" (gasoline) when refining crude oil. A mixture of kerosene and naphtha will lower the freezing point. This is how Jet B is made.
Before doing this in your garage, make sure there is no water in the mix, as frozen ice crystals will be present at much higher temperatures.
answered Oct 13, 2018 at 8:09
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1$\begingroup$ Also, don't do this in your garage, as Jet B burns/explodes much more enthusiastically than Jet A-1, and at much lower temperatures. $\endgroup$– VikkiSep 7, 2019 at 0:26