Lowering the temperature raises the viscosity, so it flows slower.People like to cold the butane and then extracts for a better result .
But is slow rate compared to room temp butane .
I think the cold butane should flow faster than the room temp butane since the butane is cooler and it's liquid in that form ?
Am i correct ?
People like to cold the butane and then extracts for a better result .
But is slow rate compared to room temp butane .
I think the cold butane should flow faster than the room temp butane since the butane is cooler and it's liquid in that form ?
Am i correct ?
i think what he is getting at is why do people use cold butane even though its slower. obviously we know that its slower because of its increased viscosity. but i think the valuable information he is looking for is that we like sub zero temps because the solvent becomes more selective at those temps not pulling as many undesirables and water content. warm solvent is much more aggressive. for those looking to make high quality and boutique level extracts the colder the better.
Can you explain how the term viscosity applies? butane is a solvent or am i missing something?
The key is that the molecules we seek are primarily C-10 through C-22, and the molecules we avoid are C-30. Extracting at low temperatures limits extraction of the C-30 molecules more than it does the lighter ones.
Solly SM, I haven't seen any viscosity charts, but we typically add propane below about -30C and extract down to around -50C with it.
If it's that cold what are you using to get the butane to go to the column? N2 or are you just getting the collection chamber even colder?
If it's that cold what are you using to get the butane to go to the column? N2 or are you just getting the collection chamber even colder?
It works push pull to about -30C after which we use a hot vapor boost.
Thanks for the info! Looks like it's time to upgrade to an active setup
With that last vessel, does that have to a certain size based on the size of the run your doing? Also will that have to be recovered or will that just be nitrogen vapor that can be burped out after?Nitrogen gas will work for the pressure assist as well. With any passive setup, you never want to be dumping into your "final" or "last" chamber. As you fill liquid, the inevitable vapors created need to be removed. If a pump isn't doing this, that is where the cold solvent tank or another vessel comes into play. This is the "pull." Nitrogen or warm solvent vapor would be your "push."
With that last vessel, does that have to a certain size based on the size of the run your doing? Also will that have to be recovered or will that just be nitrogen vapor that can be burped out after?
With that last vessel, does that have to a certain size based on the size of the run your doing? Also will that have to be recovered or will that just be nitrogen vapor that can be burped out after?
You can get away with small - it just needs to big enough and stay cold enough to chill minimal vapors. I typically do use large chambers, because I couple it as a solvent recovery tank separate from my initial solvent feed tank (so equal in size). Also know that the end of the dump will be followed by a column full of nitrogen, so it helps to be able to draw nitrogen into the bigger chambers rather than needing more "vent cycles"; or if only one solvent tank is present, I set it up so that I dump initially into a dewax chamber (same size as collection pot), while pulling the vapors into a cold collection pot. Then I vent the nitrogen from my solvent tank, drain solvent/oil mixture from the dewax chamber to collection pot, and subsequently pull the vapors from collection pot to cold solvent tank.