Sepanta 1 Bio Jet Feul

Sepanta 1

 What is biojet and why biojet?

Concerning to the shortage of the oil sources entire the world and the pollution due to that and also limitations in the safety and usage in the current compounds, the project of replacing oil compounds with the improved fuel of bio has been started in NASA in the recent years.

The result of these researches had led to producing biojet in the United States of America, which has been tested and evaluated in Virgin Atlantic and in Boeing airplane for the first time.

It is worth noting that an airplane with normal fuel which flies from London to New York, spreads more than 1/4 tons of carbon pollution for each passenger and also the Nitrogen Dioxide must be added.

The strategic issue of the shortage and ending the oil fuel and the issue of environment caused the researches to speed up.

America and the other modern countries launched to produce different kinds of biojets, which the most simple one is the mixture of Biodiesel with JP4. Basically biojet refers to the Hydrocarbon which the standards of air fuel and has the least hydrocarbon with oil bases.

There are some flies with different kinds of airplanes tested with various scales of biojet below. You can see the registered examples so far in the chart:




Feb 2008

Virgin Atlantic

Boeing 747

Dec 2008

Air New Zealand

Boeing 747

Jan 2009

Continental Airlines

Boeing 737

Jan 2009

Japan Airlines

Boeing 747

Apr 2010

US Navy


Mar 2010

US Air Force


Jun 2010

Dutch Military

Ah-64 Apache Helicopter

Jun 2010


Diamond D42

Nov 2010

US Navy

MH-60S Seahawk

Nov 2010


Airbus 320

Jun 2011


Boeing 747-8F

Aug 2011

US Navy


Sep 2011

US Navy


Oct 2011

Air China

Boeing 747-400

Jan 2012

Etihad Airways

Boeing 777-300ER



Sepanta 1 biojet:

This fuel has the freezing point of -55 centigrade. This issue has brought the possibility to increase this fuel with other standard fuels like JP4 in all the scales.

This fuel as an additive can be mixed with JP4 in the scales of 5 to 40% and has no destructive effect to the freezing and flash point of the fuel. This fuel has low water absorption and does not increase the water absorption in the fuel formulation of the airplane.

This fuel is similar to the white oil for the vapor pressure and is not sensible to the air pressure reduction in high height.

The flash point of this fuel causes the more security of the fuel mixture in the air accidents and the military missions.

America is trying to produce fuel for jet with the flash point more than 60 and the flash point of Sepanta 1 biojet is 80 centigrade.

The density of this fuel is in the acceptable suffer of JP4 and this issue causes that the mixed density of this fuel not to differ with other air fuel. The mixed calorie of this fuel with JP4 in the scale of 30% of biojet and 70% JP4 is equivalent to 40000 kilocalories for each liter which besides the standard density, this production has the least loss of engine thrust and the least increase of fuel use.

Sepanta 1 biojet is able to produce 3000 tones fuel each month in Iran. This fuel has been tested by the air industries of Iran SAHA. The specifications of this fuel according to the reports of this company are in the chart below:








0/81-0/86 gr/cc



Freezing Point




Pour Point




Vapor Pressure

10 Kpa




2.1 St



Flash Pt

80 .C



Calorie 70/30

40000 KCal/L



 In the chart number one there is a detailed comparison between JP4 and biodiesel and also the biojet of this company:







0/78-0/82 gr/cc

0/88-0/96 gr/cc

0/81-0/86 gr/cc

Freezing Point

-55 .C

-17 .C

-55 .C

Pour Point

-37 .C

-1 .C

-37 .C

Vapor Pressure

15 Kpa

5 Kpa

10 Kpa


1.7 St

8 St

2.1 St

Flash Point


130.C min


Smoke Point

25-28 mm

35-48 mm

25-30 mm


43000 Kcal/L

38000 Kcal/L

40000 Kcal/L(70/30)


 in the upper chart the similarity between Sepanta 1 biojet and the other standard air fuel is comparable.

This fuel would not face any problem in combustion and storage mixing with JP4 and in the scales of 20 to 40% there shouldn’t be any noticeable change in the engine thrust practically.

This mixture basically has less calories than JP4 and the thrust decrease of 2 to 3% is normal in the scale of 40%. For the biodiesel this scale is 10% and due to the limitation of density specially in airliner and the limitation of smoke point, flash point and freezing point and the vapor pressure, it is very difficult to produce the 40% mixture with JP4 and biodiesel.

As you can see in the chart:

1-The density of Sepanta 1 biojet is in the scales of JP4. Thus adding this fuel to JP4 will cause no changes in the mixture.


2-the second advantage of this fuel is the high freezing and cloud point:

None of the biodiesel fuel has such high freezing point. This amount is in the suffer point of JP4 bases. So using a little additive with the scale of 60 to 70% biojet and 30 to 40% of special additive, it can replace JP4 in the air industries. This production known as Sepanta 2, is being checked by this company.


3-due to the linearity of this mixture it has low smoke point and dose not cause any harm to the jet engine and the injectors in the fuel injection parts of airplane. And it is noticeable that this issue is one of the disadvantages of JP4, which is tried to be controlled in refinery.

Basically the smoke point of air fuel should not be more than 25 millimeter.


4-on the contrary to the heavy fuel like biodiesel, the vapor pressure of this fuel is near to oil and heavy gasoline, so it is not so low that face the possibility of turning on and off the flying aircraft in the heights more than 15000 feet, and not so high that lose fuel due to boiling in height decrease. Thus there is no need to do special measures in tank for the pressure increase in high altitude.

5-one of the common disadvantages between all the biodiesel fuel in air industries is the calorie drop in comparison to JP4 standard mixture. Sepanta 1 biojet mixing to biojet with the scale of 30% and JP4 with the scale of 70% has the lowest calorie deflection comparing to biodiesel. This important specification besides the other mentioned factors such as not high increase of density or changes in viscosity, freezing point and vapor pressure, caused the excellence of this mixture against other biodiesel fuel.


Sepanta 1Sepanta biojet fuel has been developed in Sakha Company because of its cooling and energy making properties which makes this fuel ideal physically to mix with many types of air fuel with JP4/5/8 standards. Using the proper additive can make this fuel to role as the air fuel solely. The similarity of this fuel to properties of JP4 standards is one of the advantages of this mixture.

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(our mission is to create a  cleaner planet.)

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