Online thermometric titration of acid number (AN) in oils (ASTM D8045)


Metrohm has partnered with industry leaders to develop an alternative standard for the measurement of acid number (AN) in crude oil and petroleum products to overcome shortcomings in the current method (ASTM D664). This new standard method (ASTM D8045) describes the use of thermometric catalytic titration for this analysis. Results agree closely with those from ASTM D664, but the thermometric catalytic titration method is far superior in terms of reproducibility and speed of analysis, with determinations being complete in one minute.

Solvent usage is much less compared to older methods, saving on waste disposal cost. Comparison studies show very close data correlation between ASTM D8045 and traditional potentiometric AN titration methods making implementation into a refinery with historic data practical.