The composition of any crude oil sample is approximated by a true
boiling point (TBP) curve. The method used is basically a batch distillation
operation, using a large number of stages, usually greater than 60,
and high reflux to distillate ratio (greater than 5). The temperature at any
point on the temperature-volumetric yield curve represents the true boiling
point of the hydrocarbon material present at the given volume percent
point distilled. TBP distillation curves are generally run only on the crude
and not on petroleum products. Typical TBP curves of crude and products
are shown in Figures 1-1 and 1-2.
ASTM DISTILLATION
For petroleum products, a more rapid distillation procedure is used.
This is procedure, developed by the American Society for Testing and
Materials (ASTM), employs a batch distillation procedure with no trays
or reflux between the still pot and the condenser.3 The only reflux
available is that generated by heat losses from the condenser.
boiling point (TBP) curve. The method used is basically a batch distillation
operation, using a large number of stages, usually greater than 60,
and high reflux to distillate ratio (greater than 5). The temperature at any
point on the temperature-volumetric yield curve represents the true boiling
point of the hydrocarbon material present at the given volume percent
point distilled. TBP distillation curves are generally run only on the crude
and not on petroleum products. Typical TBP curves of crude and products
are shown in Figures 1-1 and 1-2.
ASTM DISTILLATION
For petroleum products, a more rapid distillation procedure is used.
This is procedure, developed by the American Society for Testing and
Materials (ASTM), employs a batch distillation procedure with no trays
or reflux between the still pot and the condenser.3 The only reflux
available is that generated by heat losses from the condenser.
