Calculating Flashpoint
Calculating Flashpoint
(OP)
Does anyone know how to calculate the theoretical flashpoint for organic solvents?
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RE: Calculating Flashpoint
RE: Calculating Flashpoint
RE: Calculating Flashpoint
Good luck,
Latexman
RE: Calculating Flashpoint
RE: Calculating Flashpoint
http://www.galcit.caltech.edu/EDL/publications/reprints...
RE: Calculating Flashpoint
[100%/final mixture LEL] = SUM[ component%/component LEL]
You can get the LELs from tables.
Bear in mind that tables give values for 25degC. All LELs reduce as temperature increases and increase as temperature decreases.
Then you need a graph with temperature and % as axes.
If you can calculate the adiabatic flame temperature at the published LEL it will give you one reference point on a line of LEL vs %, for LEL = 0%. Another reference point is the LEL at 25 degC which you have. Project this line back to intercept the vapor pressure curve drawn on the same curve and that's the flash point.
Oh yes! It's an estimate so use carefully.
Try to get yourself a copy of an old Bureau of Mines publication No 627 which has section on this and plenty of references.
David
RE: Calculating Flashpoint
Is a reference I have and I'm been quite happy with it. I got it for viscosity blending calculations but they have a section on flashpoint blending calculations also. Not sure if they handle organic solvents rather than straight HC and my copy isn't right at hand, drop them an email. I've found them to be very responsive.
RE: Calculating Flashpoint
i do realize this is not really good practice, but is it possible to get a copy of that blending guide from you? i've been mulling over it if i should buy it or not. have heard quite some about, and already needed this particular reference once (blending RVP), but never quite made the decision. also a problem is shipping to germany...
chris
RE: Calculating Flashpoint
For petroleum products, might want to correlate Flash Point to T5% of each component. Then blend distillation curves (process simulators such as HYSYS can do this) and obtain T5% of blend. Back calculate Flash Point of the blend using correlation & T5% of blend.