5 replies to this topic

[pasquale]

Hy guys i need some information about the pour point of a compound or a mixture (for example a gas oil)

Thanks

Best Regards

Pasquale

[Nirav]

Hy guys i need some information about the pour point of a compound or a mixture (for example a gas oil)

Thanks

Best Regards

Pasquale

You need to carry out a laboratory experiment to find out the pour point of the hydrocarbon mixture.
For example, ASTM D5853 method can be used to determine pour point of crude oil.
You can find exact procedure for ASTM D5853 from inernet source or textbooks.


Regards,

[P.K.Rao]

Pour Point

Pour point is the lowest temperature below which the oil ceases to move or flow. The test is performed in accordance with ASTM D 97. The temperature is expressed in multiples of 3° C. The test is applicable to any petroleum product.

The sample of oil (gas oil or any other oil whose pour point is to be determined) is taken in a test jar. The specified thermometer (ASTM 5 C or 6 C or IP 1 C or 2 C as required) is inserted . The test jar is cooled in accordance with the conditions of the test method. The oil is examined for any movement at every multiple of 3° C. The temperature at which the oil just ceases all movement is noted. To this temperature 3 degrees are added and the result is reported as pour point.

Pour point can change if the thermal or mechanical history of the sample is changed. So it is necessary to observe all the test conditions.

Please refer to ASTM D 97 for details.

P.K.Rao

[Sherif Morsi]

Hi All,

Does the pour point of crude oil change? I mean, in a document I received from a client, it is stated that Crude Oil pour point is 9 C during summer and 12 C during winter.

What I know is pour point is a physical property of the fluid and it is irrelevant from changes in operating conditions. Is this right or wrong?

[PaoloPemi]

in oil industry poir point has importance because when temperature goes below pour point the product cannot be stored or transferred through a pipeline,
there are addictives which reduce the growth of wax crystals in the oil then reducing pour point temperature,
you can estimate pour point temperature with simplified correlations (for example from viscosity, molecular weight and specific density of mixture) or doing phase equilibria for solid phase (vax precipitation),
altough results may be uncertain (compared to standard test procedures where you measure the temperature of wax precipitation) there are many advantages as you can estimate quickly pour point for different oils and evaluate influence of pressure, addcitives etc.
A software capable to model solid phase is required, I utilize Prode Properties (SAFT model could be a good option) but PVTSIM and others are good alternatives.

[Technical Bard]

ASTM Manual 50 by Riazi, and the API technical data book contain correlations for estimating the pour point of hydrocarbon fractions and crude oils based on specific gravity and boiling point curves (MeABP is usually used).