Research Article

A Comparison of the Stability Performance of Blends of Paraffinic Diesel and Petroleum-Derived Diesel, with RME Biodiesel Using Laboratory Stability Measurement Techniques

Table 1

Comparison of commonly used oxidative stability measurement techniques.

EN 14112 & EN 15751 (Rancimat)PetroOxy (ASTM D7545)ASTM D2274 and EN ISO 12205ASTM D5304ASTM D4625

ApplicabilityEuropeUSAUSA (D2274) and Europe (EN ISO 12205)USAUSA

FuelsStability of FAME and FAME-containing blendsDetermining the stability of diesel fuels from B0 to B100Determining the inherent oxidation stability of a middle distillateAssessing the potential long term storage stability of dieselDetermining the inherent storage stability of middle distillates

Limit8 hours for neat FAME in Europe, 3 hours in the USANo limits specified under ASTM25 mg/100 mL in Europe No limits specifiedNo specified limits: fuel should be stable for this period

Sample volume3 mL for neat FAME and 7.5 mL for FAME/diesel blends5 mL350 mL100 mL400 mL/time measured

Temperature (°C)110140959043

PressureAmbient700 kPa OxygenAmbient800 kPa oxygenAtmospheric pressure

Flow10 L/min airNo flow3 L/h oxygen bubblingNo flowAtmospheric-no flow

TimeDetermined by the stability of the fuelDetermined by the stability of the fuel16 h16 h1 week roughly simulates 1 month of storage under normal conditions. Test carried out over 24 weeks, which is equivalent to two years

MeasurementConductivityPressure decreaseAdherent insolubles and filterable insolubles: total insolublesTotal InsolublesAdherent insolubles and filterable insolubles: total insoluble material

Applicability (advantages/Disadvantages)Long analysis time for low FAME blends, time-consuming sample preparationRapid method, highly accelerated so not fully representative of actual stabilityShort test, not fully representative of actual aging potential (comparative)Short test, not fully representative of actual aging potential (comparative)Long term storage potential, close to real life conditions but very slow