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BHO Thermos Extraction - Points of Concern
- Thread starter InjectTruth
- Start date
InjectTruth
Active member
Glad to see this discussion progressing. Just ordered a 48oz thermos after failing to find one locally. This one right here, http://www.amazon.com/gp/product/B000RHFRVS/ref=oh_details_o00_s00_i01
Can't wait to fill er up!
Can't wait to fill er up!
In my opinion, the gas spat from the annular gap between the tip and the body of the can.
I think the reason may be decreased elasticity of a seal in the valve after cooling in the freezer.
Could be! It could also be a function of the propane in the mix, because I should have been cold enough to not have butane pressure.
InjectTruth
Active member
I received my thermos, but im afraid there may be a snag. the top metal lid has a plastic ring/inside cover, as you can see here
the plastic inside is polypropylene, marked by a #5 PP. It appears I might be able to pry the plastic shroud off, but this would take the threads with it as well, meaning the remaining metal lid would not fasten correctly.
Here is the thermos itself,
Should I return it and continue my quest or is this somehow suitable for the application?
the plastic inside is polypropylene, marked by a #5 PP. It appears I might be able to pry the plastic shroud off, but this would take the threads with it as well, meaning the remaining metal lid would not fasten correctly.
Here is the thermos itself,
Should I return it and continue my quest or is this somehow suitable for the application?
Hamburglar
Active member
People in the thread have said that you don't need an airtight lid as the gasses will be evaporating slightly anyway. Just punch some holes in a jam jar lid and just place it over the mouth of the thermos for spraying.
gunnaknow
Active member
Yup, as Hamburglar said. I always use a jam jar lid to inject the gas. Well, maybe sometimes a marmalade jar lid. lol
https://www.icmag.com/ic/showthread.php?p=5449749#post5449749
Providing that there's no breeze, you don't actually need to keep a cover on the thermos after injecting. The cold propane/butane gas is heavier than the surrounding air and forms an insulating layer that protects the liquid. This will help explain further.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/vacfla.html#c3
I should add that at room temperature nitrogen gas is actually lighter than air, so the nitrogen gas only insulates when it is much colder and therefore denser. On the other hand, propane and butane are denser than air even when they're at room temperature, so they don't need to be as cold as the nitrogen to form a good insulating layer.
https://www.icmag.com/ic/showthread.php?p=5449749#post5449749
Providing that there's no breeze, you don't actually need to keep a cover on the thermos after injecting. The cold propane/butane gas is heavier than the surrounding air and forms an insulating layer that protects the liquid. This will help explain further.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/vacfla.html#c3
I should add that at room temperature nitrogen gas is actually lighter than air, so the nitrogen gas only insulates when it is much colder and therefore denser. On the other hand, propane and butane are denser than air even when they're at room temperature, so they don't need to be as cold as the nitrogen to form a good insulating layer.
Polypropylene is rated as excellent for n-butane service by Cole Palmer's chemical suitability guide.
InjectTruth
Active member
Excellent all around!
Gunnaknow - thats great, im sorry i didnt go back to the thread and re-read it first. Now I can actually use it as a thermos as well!
Gray Wolf - Even better! the thermos came with a second, inner PP white lid, so I can use that one to put the nozzle in, and keep the outer steel/plastic coated lid for thermos function.
Not too shabby!
Gunnaknow - thats great, im sorry i didnt go back to the thread and re-read it first. Now I can actually use it as a thermos as well!
Gray Wolf - Even better! the thermos came with a second, inner PP white lid, so I can use that one to put the nozzle in, and keep the outer steel/plastic coated lid for thermos function.
Not too shabby!
InjectTruth
Active member
One last question before I embark on my maiden voyage. I recall reading somewhere recently about matching the volume of gas with the volume of the thermos. I just scoured the AA thread, thinking Id seen it there, to no avail.
If I recall correctly, the volume on the can (300mL) represents the volume of the liquid gas not under pressure. Therefore for a 48oz thermos (1440mL) would require no more than 4.8 cans - the volume of the kief. Is this correct? Whats a good rule of thumb in terms of maximum volume of material to be extracted? No more than 50% of the volume of your container? 25%?
Thank you all very much for your contributions.
If I recall correctly, the volume on the can (300mL) represents the volume of the liquid gas not under pressure. Therefore for a 48oz thermos (1440mL) would require no more than 4.8 cans - the volume of the kief. Is this correct? Whats a good rule of thumb in terms of maximum volume of material to be extracted? No more than 50% of the volume of your container? 25%?
Thank you all very much for your contributions.
I think the label says the volume of liquid in the can under pressure.
When filling a thermos propane will evaporate and fluid volume will decrease by 11% or 22%, depending on the brand.
To create a fluid motion, it is necessary to periodically shake the flask gently, so probably should not fill it completely to avoid splashing out.
When filling a thermos propane will evaporate and fluid volume will decrease by 11% or 22%, depending on the brand.
To create a fluid motion, it is necessary to periodically shake the flask gently, so probably should not fill it completely to avoid splashing out.
InjectTruth
Active member
50g of kif soaking in 300mL of tane for about 2 hrs and counting. Going to strain the tane in a few minutes. WOOT!
Sure hope you show it before you finish it off, ha.
On the thermos you bought how did you inject the tane, did you go through the pouring spout, I have the same thermos, you didn't drill any holes is that right? Its great also for stews to take on walk.
On the thermos you bought how did you inject the tane, did you go through the pouring spout, I have the same thermos, you didn't drill any holes is that right? Its great also for stews to take on walk.
As noted by GK, it isn't necessary to drill any of the thermos components, as you can simply drill a 1/8" hole in any lid that will just sit over the top of the thermos while injecting. If I wanted to use it for dual purpose, I would just make a stand alone injection lid out of a quality scientific grade fruit jar lid, or equivalent.
Thank you Gray Wolf. Sounds easy peasy. You guys are the best.
Kushed_
Member
Would this work?
1-Freeze all componets (material, column, etc)
2-Pack column as usual and use 1-2 coffee filters
3-Drill two holes in fill cap, one for butane & one for equalizing pressure
4-Press column down on Pyrex so that it would cutoff/impede flow of butane out of bottom of the column
5-Lift column and use bike pump to flush column
1-Freeze all componets (material, column, etc)
2-Pack column as usual and use 1-2 coffee filters
3-Drill two holes in fill cap, one for butane & one for equalizing pressure
4-Press column down on Pyrex so that it would cutoff/impede flow of butane out of bottom of the column
5-Lift column and use bike pump to flush column
Ummmmm, it would sure be an interesting experiment and the filters might get coated. Hope you will report back!
