I’m attempting my first second pass I might distillation machine. I have about a hundred eighty grams of first pass distillate and I’m using a 500ml short path. I was running the biggest load I’ve ever done and I had to do two first pass batches, well I my second batch I didn’t clean out the boiling flask cuz I assumed THC he would be in there. Instantly I saw my reflux with a darker tone right after the first couple minutes of my run. I got a couple of shades darker distillate on my second run then I did my first.
My question is what can I expect in yield and is 180 g enough to run in 500 mL without too much loss.
Is the gracian something to worry about, ipull about 400 Mike rounds first pass.
Wood a lle wash be a better option? I’ve read much on that but have no experience on it.
The after taste/smell of this distilate is why I’m even wanting to so this. I’ve always have it but it puts much of a cough and rubbery taste to it.
Ramp up your temperatures slower on your second pass, you won’t have to get as hot. If you know what
mantle temperature your main fraction came out at from your first run, I would guess that it will come out maybe 10 degrees lower. This will be in part because you should get a much deeper vacuum without all the extra garbage in the system.
Should I run with cold trap on second? From what I understand the cold trap will reduce vacuum with the cold but will it be needed? But less over space would that be better?
Hooked up my cold trap wasn’t pulling down low enough. I’mstaring pulling heads @ 180 about 300 micron. Waite dabout 20 mins then went to 190. Started getting thicker waited 15 mins. Then went to 200, once I got to 200 i started swirling, changed over and noticed my micron slowly going up. Now sitting at 600 and slowly rising? Don’t know what’s going on
When I run 2nd pass, I usually am below 90 microns during mains, with a slightly lower vapor temp than first pass ~160-165C. I typically yield 85-90% weight of starting 1st pass. I always use a cold trap.
Hey tet! Thanks for the response, think I just have a vacuum problem. Flushed it 3 times before run and just got worst. Still pulling mains but a@215 so about the same as my first pass. Don’t know what I’m acheivong here tbh. Got some heads out though. Is there a time when you know when to pull to tails and should I increase temp when I’m close to that point?
I’m still not too confident as to when to swap to tails, but things I look for are a drop in vapor temp and vacuum pressure. Assuming the volume of mains looks good, I will use those as indicators as well as the color of the disty getting darker.
Not sure how old this thread is but I came across it doing some reading.
Those vacuum spikes are normal on a first pass but yours are a bit high. I swear, because I recently made this upgrade myself - get a beefier vac pump. A slightly overly beefy one. Flow rate is just as important as ultimate vacuum as it’s the cfm that will keep up with all the gases evaporating in the still.
I am right now running a 7 cfm Alcatel on a 2L SP and pulling 18 microns on my first pass. Back when I used a Welch 1400 that was very, very difficult.
Didn’t grease joints is ultimately what started the slow micron climb. Grease your shit kids! old thread but I remember this to a T figured I’d respond
Still pulling mains but a@215 so about the same as my first pass. Don’t know what I’m acheivong here tbh. Got some heads out though. Is there a time when you know when to pull to tails and should I increase temp when I’m close to that point?
old thread but I remember this to a T figured I’d respond