Oil boiling point at vacuum

In summary, the boiling point of a refrigeration POE oil at 500 microns absolute pressure is dependent on the specific oil and its phase diagram. It is important to refer to technical information from the manufacturer or other reliable sources in order to determine the exact boiling point. The use of "microns" instead of "millitorrs" is common in engineering jargon, but may not be widely understood.
  • #1
Yuri B.
137
0
What may be the boiling point (temperature) of a refrigeration POE oil at, let's say, 500 microns absolute pressure ?
 
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  • #2
Your question is unclear. 500 microns of what? Water? Mercury?

In any event, this information would probably be found on a material property sheet from the manufacturer.
 
  • #3
Millitorrs are generally called "microns". It is assumed among refrigeration engineers that during vacuumation processes the oils in systems worked upon, themselves, do not boil - no matter how high vacuum would be achieved. I am in doubt.
 
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  • #4
Every liquid has a vapor pressure ... if your vacuum goes below that, your oil will spread through the vacuum.

Every electron microscope engineer knows this.

Of course the vapor pressure is also sensitive to temperature; you would need the phase diagram to cover all of the pressure-temperature points.Here is a discussion of your topic in a refrigeration engineer forum:
http://www.refrigeration-engineer.com/forums/showthread.php?15384-Vaporize-POE-Oil

PS: in the sciences we call a millitorr a millitorr ... your use of "microns" refers to "microns of Hg". I'm sure it is useful in your engineering jargon as a short way of saying what you mean, but it is certainly not a common expression.
 
  • #5
I have already read this thread, thank you. (but it did not answer my question)
 
  • #6
Why do you think we would know the answer? It depends upon specific, detailed knowledge of the oil and its phase diagram.

Thus you should be searching for technical information on your POE oil; for example, the manufacturer's website.
 

What is the boiling point of oil at vacuum?

The boiling point of oil at vacuum depends on the type of oil being used. Generally, the boiling point ranges from 250-350 degrees Celsius.

Does the boiling point of oil at vacuum differ from its boiling point at normal atmospheric pressure?

Yes, the boiling point of oil at vacuum is significantly lower than its boiling point at normal atmospheric pressure. This is because the lower pressure in a vacuum allows the oil to boil at a lower temperature.

Why is the boiling point of oil at vacuum important?

The boiling point of oil at vacuum is important for various industrial processes that require the use of vacuum distillation, such as refining crude oil or producing essential oils. It is also important for understanding the behavior of oil under different conditions.

What factors affect the boiling point of oil at vacuum?

The boiling point of oil at vacuum is affected by the type of oil, the level of vacuum, and the purity of the oil. Additionally, the boiling point can be influenced by external factors such as temperature and pressure.

How is the boiling point of oil at vacuum measured?

The boiling point of oil at vacuum is typically measured using a vacuum distillation apparatus, where the oil is heated and the temperature at which it begins to boil is recorded. This process is repeated at different levels of vacuum to determine the boiling point at varying pressures.

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