De-watering question / idea

[jgnat1488]

Hey all,
I know this has been brought up on other lists but i am looking for some freash input. Can you use JUST high vacuum to dewater WVO?? I know that in hvac work you pull a vac. on the system so that it will cause the moistier to boil at room temp. The vapor then gets sucked out thru the vac pump. I see no reason why this woun't work on ANY liquid. I am looking at using vacuum for alot of thins like filtering and moving oil from place to place. My uncle (mbgreaser) and I have discussed this some and are tempted by the idea. Would really love to hear from people (DANA) that have tried this. Any/all input welcome.
Jason Gnatowsky

[grease man]

if the system is air tight it should work, or tight enough to achieve a decent
vac like 28 hg

[vegipete]

Sounds like a neat idea, provided your containers don't collapse.

Some quick research and calculations indicate that a pretty decent vacuum is needed to boil water at room temperature - better than 29 in of mercury.

The following web page has some usefull facts:
http://www.fnrf.science.cmu.ac.th/theory/vacuum/More%20Vacuum%20Basics.html

The vapour pressure of vegetable oil is merely described as very low, so it shouldn't boil.

The following could be of general interest:
http://www.fischer-tropsch.org/DOE/DOE_reports/ev45a_2_f3c/ev45a_2_f3c_sec08.pdf

[cgoodwin]

I know you can walk around three sides of a box and you can use a weed eater to skin a cat, but I am pretty sure just heating it up to sufficient temp for a few hours will do the trick.

Chris

PS. Sarcasm is just for fun

[madcat8000]

how hot for how long and will that get the water that settles to the bottum?

[jgnat1488]

I know that heat will work but I am looking at doing filtering and transfer between tanks with vac instead of pumps. Since I would have the main parts of the system together, this seems like a logical step. Besides with heat you have a couple of things I don't like (but can deal with) 1) wastefull in the from of electricity and or fuel to heat 2)if using open flame there is an increased risk of a grease fire. Just wanting to be differant is reason enough :D

[großewagen]

spotted this on another forum:

a fuel tank water eliminator

http://www2.northerntool.com/product-1/200310919.htm

There are 2 sizes 3.5" and 7"