ASTM D7169 Standard Method for Boiling Point Distribution of Samples with Residues Such as Crude Oils and Atmospheric and Vacuum Residues by High Temperature Gas Chromatography (GC)

Scope:

In ASTM D7169, the boiling point distribution of crude oils, vacuum residues and other petroleum fractions can be determined which provides useful information for the refinery operations. The mass percent yield of products can be estimated using these boiling point distributions.

Procedure:

In ASTM D7169, the value arrays are used to store the boiling point distribution results for the samples. They are mixed together at a temperature that does not surpass the boiling point of n-nonane. From the combined data, a new boiling point distribution is calculated. After the integration, recovery larger than 100% by mass is normalized.

Video 01: Crude Oil Analysis. Simulated distillation (simdist) by Gas Chromatography

Data:

 The response factor can be calculated by using the following formula:

     F_i = M_i ×P_i ×Ac₂₀

             A_i ×Mc₂₀×Pc₂₀

M_i = mass of paraffin 

Mc₂₀ = mass of eicosane

 A_i = peak area of paraffin

Ac₂₀ = peak area of eicosane

P_i = percent purity of paraffin

Pc₂₀ = percent purity of eicosane

Specimen size:

The specimen should be conditioned at a temperature nearest to ± 0.5 °C (1 °F).

Conclusion:

ASTM D7169 standard method involves using high temperature GC to determine the boiling point distribution and cut point intervals of crude oils and residues.