We put the coil in dry ice worked awesome tank in dry at LO reading on IR
We did a single line recovery and way got 1.11 lbs a min
How do you have such a precise lb per minute number?
Did you try a slurry with iso or acetone on either coil or tank?
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Dry ice alone will never make intimate contact with the steel so it’s best to always use a slurry ime otherwise you burn thru dry ice with reduced efficiency.
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We need lots of intimate contact… It can get a little frothy if you get to running really fast. Leave some room in the bucket.
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Awesome so takeaways are - multiple coils on the recovery for sure increases recovery speed. - slurrys are super necessary - widest opening possible all the way back to solvent tank - size your water heater accordingly 
love this forum (in the threads that don’t have drama 
)
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Pull one of the coils out of the slurry when ever you need to manipulate psi, thats what i did when i ran dry ice. I lut mine im stock pots full of acetone and surrounded the pot with dry ice. Im all propane and dont use dry ice any more but it worked like a champ when i was running that way
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Quick question. Am I fully recovered when the material column will hold vacuum at room temperature? My guess is yes, there’s no more butane trying to get out.
If it’s actually at rm temp, yes, you have the majority of the solvent out.
Running hot water through the jacket is one way of ensuring the columns are actually AT rm temp or better.
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I’m not at full production yet. Still in the R&D phase, learning. I usually only make a single run in a day, paying close attention and micro-managing. Oftentimes, I’ll leave the material in the column overnight to thaw everything out. I run passive until I’ve poured, then active to clear the rest out and get back to negative pressures. I don’t punish my recovery pump to get to 30 inches. I usually stop in the low 20s. The following morning, once it’s all back to room temperature, I kick on the pump and bring it back into the negative 20s. I don’t get much, but I get a little bit more gas out of the system. I’ll let that sit all morning. If it holds a vacuum, I call it good and break down the system to clean. I don’t seem to be using a lot of butane, but I’m also not running enough to really know. Thats why I asked.
running that way, your losses are essentially what you’re pouring with.
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What do you mean by vapor blow by? The coil not condensing 100% of vapor to liquid?
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