ASTM D7169-23 pdf free download- Standard Test Method For Boiling Point Distribution Of Samples With Residues Such As Crude Oils And Atmospheric And Vacuum Residues By High Temperature Gas Chromatography.
This testing procedure is designed to assess the boiling point distribution and cut point intervals of crude oils and residues through the use of high-temperature gas chromatography. The quantity of residue (or sample recovery) is measured using an external standard.
The scope of this testing procedure is expanded to include samples that do not fully elute from the chromatographic system. It is employed to evaluate the boiling point distribution up to a temperature of 720 °C, which corresponds to the elution of n-C100.
The procedure is employed to determine the boiling point distribution of crude oils. It involves the use of capillary columns with thin films, which leads to the incomplete separation of C4-C8 when a large amount of carbon disulfide is present, resulting in an unreliable boiling point distribution for this elution range. Moreover, the quenching of the detector’s response to hydrocarbons eluting during carbon disulfide elution causes an unreliable quantitative analysis of the boiling distribution in the C4-C8 region. As the detector does not quantitatively measure carbon disulfide, its removal from the sample through solvent-only injection and adjustments to this region using quenching factors results in an estimated net chromatographic area. An additional, higher-resolution gas chromatography (GC) analysis of the light end of the sample might be required to obtain a more precise depiction of the boiling point curve within the specified interval, as described in Test Method D7900 (refer to Appendix X1).
The method is also intended to determine the boiling point distribution of other samples that do not fully elute, such as atmospheric and vacuum residues, where the sample components are separated from the solvent.
A correlation between the boiling range distribution obtained from Test Method D2892 and the weight percentage data calculated using this method is provided in Appendix X2.
This testing procedure is not suitable for analyzing materials with heterogeneous components, such as polyesters and polyolefins.
