Distillation II | MIT Digital Lab Techniques Manual
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- Опубликовано: 17 окт 2024
- Distillation II: Vacuum Distillations
Do you need to purify a liquid that boils above 150°C? This video shows you how to perform a distillation under vacuum.
Created by Dr. Sarah Tabacco and Aaeyesha Siddiqui
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License: Creative Commons BY-NC-SA
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Very good indeed. Perfect overview about the subject
So from a smart guy, at what ammount of pressure should the vaccum be to boil off alcohol at 170 although keeping essential oils over 250 degree? ;)
Great video! We are using a vacuum distillation with crude oil to determine bitumen asphalt original viscosity and we have a bit of debate on how we are replicating the temperature, we have conflicting techniques that are compromising results dramatically and wonder if anyone has any input on the matter. In our large boiling flask set up with a fractional cooling column under vacuum we will run our oil temperature 1 of 2 ways to determine the amount of resid in the crude oil and the original viscosity of the remaining resid at said temperature. I want to know which method is the correct method when trying to replicate our process.
Method 1 we use a 760 F thermometer 0.5 inches from the bottom of the boiling flask and take the temperature up to what would match our furnace outlet temperature under NOC (680-710 F) just before our production resid goes from our atmospheric crude column into our vacuum column and shut off the sample to get a resid volume from deducting the distillate from the total starting volume of the sample.
Method 2 we use a 760 F thermometer 0.5 inches from the bottom of the boiling flask and use a nomograph to determine furnace outlet temperature under NOC (actual furnace outlet temp before it goes into our vacuum column is 680-710 F, on the nomograph it corrects to 440-460 F) just before our production resid goes from our atmospheric crude column into our vacuum column and shut off the sample to get a resid volume from deducting the distillate from the total starting volume of the sample. Any help on this matter would be appreciated!
how low is the pressure can we go? an example of flasks 10 like and other Apparatur?
what would be the atmospheric pressure to boil water at room temperature?
Pv = nrt.
Close, about 14.7 at sea level is the accepted standard.
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1 atmosphere which I think is 15 p.s.i , that's what i remember from high school.
liquid nitrogen is a stupid idea for trap, because bp of O2 is -183°C and bp of N2 is -210. O2 can liquefy and in combination with org.mat. cause explosion!!
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