Speaking of burping...
I know that when you tap cap's to fill a storage tank some atmosphere is pulled in and that there is some propane in the canned butane as well.
So how far down would you have to chill a storage tank so that the only gas in the tank was atmospheric gases and propane?
Would -20 degrees celsius -2 farenhiet be cold enough?
I pulled 13 grams from a tube full of trim, was fluffy white awesomeness and I applied a little too much heat to it and it got a bit amber. Overall I'm really happy and about to run 2 more tubes.
One thing that's happening is my system isn't running at very high pressure, is this because I'm not heating the recovery pot and only icing down the refrigerant recovery tank?
On the above run , butane began to escape past the top clamp so I shut the appion down, dumped the tube, and continued with the run to a successful finish. Am I packing the tube too tight? I put 2 coffee filters down the bottom then begin filling and pack with a 1 3/8 dowel pushing each load down once as hard as I can.
I remember in class we were running at like 40ish PSI , My system is only getting to 20. The refrigerant recovery tank has 7.25lbs of butane in it and I haven't heated the recovery pot , only have the refrigerant tank in a cooler encased in ice.
Before it vented butane vapor out the top tricamp gasket I was in the middle of the final flood, the pressure rocketed from the 20psi it had been running at to 35ish , the entire recovery pot and column began to ice over and that is when vapors came out, i'm assuming because the total volume of the system couldn't hold the volume of butane plus the oil in the pot?
I am using a JB M2 -250B gauge that I zeroed before the run and pumped down to -10hg as instructed by Skunk Pharm in between cycling valves #2 and #4
Thanks
Yes. Propane boils at -42C, and Isobutane at -11.7C. The N-Butane boils at -.5C.
What was strange was that there wasnt any leaks for the first 3 pulls, then it started to spurt i shut the in line dumped the column and it stopped and started to recover butane.
Did a run after with no problems.
So with a pressure gauge attached to a tank at -20C if the pressure was not zero that would be evidence of gas other than butane and the tank could be bleed to zero, while of course observing standard safety precautions.
Interesting thought, cooling the tank to -20C it should be possible to recover the propane and atmospheric gases to another tank and then chill the second tank to less than -42C to separate the at atmospheric gases from the propane.
Any off the cuff idea about how much propane is typically in the lucienne butane?
When you guys are doing multiple column runs, are you keeping negative pressure in the collection pot, and then pulling a vacuum to -30hg before putting a new column on? Or just letting it ride?
The artsy looking stuff...
no editing just adjusted the aperture on the microscope.
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They don't break it down, by percentage on the MSDS, but typically propane runs around 11/27%.
Really?
Well if thats the case it makes alot more sense that there would be empty cans to me.
For a product of this nature 11-27% is a HUGE difference imo, kinda shows how strictly regulated the industry is, or isnt for that matter...
"Hey! How much propane we need in these cans boss?"
"Just fill em with the usual, somewhere between 1/10th and 1/3rd"
Perhaps we can suggest a canned butane episode of "How its Made"??
I wonder if the variation in amounts of propane has to do with gasses settling (not sure if thats the proper term) in the machine before they fill the can.
Also the variation in gases might have something to do with that "mystery oil"...lots of possibilities....
The variation that I quoted was by brand. They keep the same mix within brands.
Typically they are mixed with a proportioner, which blends the gases from individual sources, so there is no settling and they typically wouldn't settle out sitting around, as they are a mixture, not a suspension.