Total acid number in engine and hydraulic oil with thermometric titration
8.000.6066
en
The thermometric titration method presented here permits a simple and direct determination of the total acid number (TAN) in petroleum products. It is an invaluable alternative to current manual and potentiometric methods. Thermometric titration uses a maintenance-free temperature sensor that does not require rehydration and is free of fouling and matrix effects. The procedure requires minimal sample preparation. Results agree closely with those from the potentiometric titrimetric procedure according to ASTM D664, but the thermometric titration method is far superior in terms of reproducibility and speed of analysis, with determinations being complete in approximately one minute.
The total acid number (TAN) is an important quality parameter for engine and hydraulic oils, as it reflects the degree of oil degradation and corrosion potential. Current standard methods for TAN determination, such as ASTM D664, are based on potentiometric titration, which is time-consuming and requires frequent calibration and electrode maintenance. This poster presents a thermometric titration method that overcomes these drawbacks and offers a rapid and reliable way to measure TAN in petroleum products.
Thermometric titration uses a temperature sensor that responds to the exothermic reaction between the acid and the base. The method has excellent reproducibility and accuracy and can be performed in less than a minute per sample. The applicability of thermometric titration is demonstrated for engine and hydraulic oils, and the results are compared with those obtained by the potentiometric method.