Acid Number measurements of crude oil and petroleum products using ASTM D8045

Reproducible and accurate results in 60 seconds!

New method uses thermometric titration Acid Number (AN) is an important crude oil quality para02

ween laboratories and often disputes re garding meter used to determine a refining value for crude oil. the quality and the price per barrel of the crude.

Petroleum refining and transportation infrastructure is also impacted by the accuracy of AN measurements as Metrohm has partnered with industry leaders to these acidic compounds lead to corrosion. Until now AN develop an alternative to D664 for the measure­

has been measured by ASTM method D664. How ever, ment of crude oil and petroleum products. The when analyzing crude oils and heavy refinery fractions, resulting ASTM method D8045 describes the use method D664 presents the analyst with a number of thermometric titration for this analysis.

of challenges leading to poor re pro du ci bi lity bet­

Ther mo metric titration is ...

• more accurate and reproducible with an improved solvent mixture that better dissolves difficult samples containing high paraffinic content

• uses less solvent saving you substantial costs for waste disposal

• much faster because results are available in 60 seconds –

without prior sensor conditioning and calibration required See for yourself

ASTM D664

ASTM D8045

(Potentiometric)

(Thermometric)

Titrant

0.1 mol/L KOH in IPA

0.1 mol/L KOH in IPA

Solvent

Toluene/IPA/water

Xylene/IPA

Solvent volume

125 mL

30–35 mL √

Titration time

~220 s

~60 s √

Conditioning of electrode

3–5 min

none √

Solvent wash, rehydration,

Sensor maintenance

IPA dip, refill with electrolyte, Solvent wash is sufficient √

store in LiCl in ethanol

Sample size (expected AN

20 ± 2 g

~10 g √

of 0.05 – <1.0 mg KOH/g)





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The 859 Titrotherm is available as a walk-up analyzer or an automated configuration.

859 Titrotherm – the best solution for ASTM D8045

The Metrohm 859 Titrotherm and ASTM D8045 is the What is thermometric titration?

best solution for the measurement of AN in crude oil and Thermometric titration uses a highly sensitive, fast respetroleum products. The 859 Titrotherm is easy to use as pon d ing sensor to detect an enthalpy change at a single it requires no sensor maintenance aside from a sol­

end point. Because all of your sample is dissolved, a con­

vent rinse; this means no hydration, no calibration sistent, reproducible measurement with RSD values less and no filling solutions. The entire system is operated than 2% is obtained. Whether you are using a walk­up by tiamo, the world’s number one titration software analyzer or an automated systems the results are con siswhere pre­defined methods make it easy to view and tent between operators or locations.

re port results.

Our automated systems allow you to simply weigh your samples and make the measurement. These systems also reduce exposure to solvents and will safely operate in a fume hood.

For a complete video demonstration visit Get one, well-www.metrohm.com/ASTM­D8045

Thermometric titration determines the endpoint (EP) via the reaction enthalpy, i.e. the temperature change in the measuring solution

Metrohm offers dedicated analyzer configurations for ASTM D8045. Please contact your local sales office for more information and ordering information.

www.metrohm.com

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