Application PetroOxy: Temperature Dependency of Test Results According to Arrhenius

The temperature dependency of test results for diesel was investigated. Arrhenius equation was checked.

Alternative to Traditional Stability Test Methods

The rapid small scale tester, PetroOxy, is a fast, safe and user friendly alternative to traditional stability test methods. The instrument measures the induction period, which can be used as an indication of the oxidation and storage stability. Compared to other oxidation and storage stability test methods, the PetroOxy procedure requires only a small sample to give exact test results in a short period of time.

Quick Preparation and Easy Handling

All it takes on preparation is to fill in the sample into the Teflon dish, tighten the pressure chambers lid and close the instrument. The test cell is automatically charged with oxygen pressure and heated until it reaches the test temperature of 140 °C in the standard program. Now the pressure is monitored until a pressure drop of 10 % from pmax is detected.

Fig. 1: Display of test progress

Arrhenius Plot

An Arrhenius plot displays the logarithm of kinetic constants plotted against inverse temperature. Arrhenius plots are often used to analyze the effect of temperature on the rates of chemical reactions.

By experience, test times halve when the temperature is increased by 10 °C.

Results for Arrhenius Tests
Test temp.
[°C]
Test temp.
[1/T]
pmax-10%
[minutes decimal]
1100.00911,973
1200.0083745
1300.0077291
1450.0071119
1500.006753
1600.006325

Fig. 2: Plot of Arrhenius test results

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