CRUDE ASSAY ANALYSIS Distillation characteristics of a crude are assessed by performing a preliminary distillation called ‘True Boiling Point’(TBP) analysis, which enlightens the refiners with all possible information regarding the percentage quantum of fractions, base of crude and the possible difficulties during treatment operations.
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CRUDE ASSAY ANALYSIS
Distillation characteristics of a crude are assessed by performing a preliminary distillation
called ‘True Boiling Point’(TBP) analysis, which enlightens the refiners with all possible
information regarding the percentage quantum of fractions, base of crude and the possible
difficulties during treatment operations.
PROPERTIES OF PETROLEUM FRACTIONS
Distillation of petroleum products boiling below 370 °C (IP 123/58)
Distillation, process of heating a liquid until its more volatile constituents pass into the vapor phase,
and then cooling the vapor to recover such constituents in liquid form by condensation. The main
purpose of distillation is to separate a mixture of several components by taking advantage of their
different volatilities, or the separation of volatile materials from nonvolatile materials
Octane number
Cloud and Pour Points
KINEMATIC VISCOSITY BY RED WOOD I and REDWOOD II VISCOMETERs
Redwood viscometer I is used for low viscosity oils whereas Redwood viscometer II is used for
highly viscous oils. The flow port diameters of I and II types are different. No. of sec. required for
flow of fixed quantity of oil (usually 50 cc ) is a measure of viscosity.
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ANILINE POINT OF LIQUID PETROLEUM FRACTION
This is an approximate measure of the aromatic content of a hydrocarbon fuel.
It is defined as the lowest temperature at which a fuel oil is completely miscible with an equal volume
of aniline. Aniline is an aromatic compound and aromatics are more miscible in aniline than are
paraffins.
Hence, the lower the aniline point, the higher the aromatics content in the fuel oil.
The higher the aromatics content, the lower the cetane number of the fuel.
The aniline point can thus be used to indicate the probable ignition behavior of a diesel fuel.
Diesel Index, Cetane Rating:
Ignition quality order among the constituents of diesel engine
fuels in order of decreasing cetane no, is as follows: