Standard Test Method for Acid Number of Crude Oils and Petroleum Products by Catalytic Thermometric Titration

Importancia y uso:

5.1 Crude oils and oil sands bitumen contain naturally occurring acidic species. Acidity of crude oil has been implicated in corrosion of distribution and process systems. The relative amount of these materials can be determined by titrating with bases. The acid number is a measure of this amount of acidic substance in the oil under the conditions of the test.

5.2 Acid number of crude and distilled petroleum fractions has been measured by Test Method D664. Test Method D664 was developed for the analysis of lubricants and biodiesel. The titration solvent used in Test Method D664 does not properly address dissolving difficult samples such as crude oil, bitumen, and high wax samples addressed in this test method. Refer to Appendix X1.

5.3 Test Method D974 is also not applicable to measuring acidity of crudes and highly colored samples because the indicator is not visible or it is difficult to discern a color change to detect the end point of the titration.

Subcomité:

D02.06

Referida por:

D0664-24, D0664-24, D0664-24

Volúmen:

05.04

Número ICS:

75.040 (Crude petroleum), 75.080 (Petroleum products in general)

Palabras clave:

acid number; corrosion; crude oil; naphthenic acids; thermometric titration;