1. Scope 1.1 This test method covers the determination of the Farnesane, Saturated hydrocarbons and Hexahydrofarnesol content in Synthesized Iso-Paraffins (SIP) fuels for blending with Jet Fuel by gas chromatography. 1.2 Farnesane is determined from 96 to 99.9 mass %, Sum of saturated hydrocarbons including Farnesane is determined from 97 99.9 mass % and Hexahydrofarnesol is determined from 0.02 2.0 mass %. 1.3 This test method does identify and quantify main impurities or group type of impurities but does not purport to identify all individual components that may be present in Synthesized Iso-Paraffins (SIP) fuels for Jet Fuel blending. 1.5 This test method is inappropriate for impurities that boil at temperatures higher than 460C or for impurities that cause poor or no response in a flame ionization detector. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The use of Synthesized Iso-Paraffins (SIP) fuels, produced from hydroprocessed fermented sugars as a synthetic blending component in aviation turbine fuels for use in civil aircraft and engines is being evaluated for approval by the subcommittee D02-J06. Such SIP are produced into step (i) by the fermentation of sugars into Farnesene followed by (ii) hydrotreatment and fractionation of Farnesene into Farnesane. As part of the proposed requirements to be incorporated in ASTM D7566 Aviation turbine Fuel containing synthesized hydrocarbons, three composition specifications of SIP fuels have to be met: (i) Farnesane content of more than 97%, saturated hydrocarbons content of more than 98% and hexahydrofarnesol content of less than 1.5%. Hexahydrofarnesol is produced from the hydrogenation of Farnesol generated during the fermentation step and is the major by product of the production process. Currently there is no ASTM method to determine the purity of SIP fuels to insure a constant quality of the grade according to the specifications described above. The method proposed below allows controlling the quality of the SIP fuel grade for aviation turbine fuels application according to these new specifications.
KeywordsFarnesane; jet fuel; gas chromatography
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Frank Di Sanzo
Ballot Item Approved as D7974-2015 and Pending Publication