DEPENTANIZATION OF GASOLINE AND NAPTHAS: ASTM D2001
EXPLANATION
The presence of pentane and lighter hydrocarbons in gasolines, napthas, and similar petroleum distillates interferes in the determination of hydrocarbon types by Test Methods ASTM D1319 and ASTM D2789. Pentane and lighter hydrocarbons are separated by this test method so that the depentanized residue can be analyzed, and pentane and lighter hydrocarbons can be analyzed by other methods, if desired. Typically about 2 volume % of C5 and lighter hydrocarbons remain in the bottoms, and C6 and heavier hydrocarbons carry over to the overhead.
TEST SUMMARY
A 50-mL sample is distilled into an overhead (C5 and lighter) fraction and a bottoms (C6 and heavier) fraction. The volume of bottoms is measured and the volume %, based on the charge, is calculated.
TEST PRECISION
This test method has a repeatability of 2 and a reproducibility of 4 volume %. This is an empirical test and a statement of bias is not appropriate.
