I’m pretty new to the bho scene and I have recently built up my own extraction column and also made my first passes. Before I have done that, I really read a lot on this page.
So my passes hadn’t been too bad ive made 1 batch with about 100g of trim and also tried two frozen extractions.
First some facts about my column.
I have a 2” column which fits about 50g of nugs, leading to a 6x6” collecting chamber. I do not recover my solvent. I have a 4CFM 2 stage vacuum pump from best value vacs. And I have only used butane this time. That’s pretty much it.
Now I will let you know how I have done it and will ask some questions which I couldn’t find in the threads, Sorry if it is somewhere and I haven’t found it I really searched a lot.
So first I chilled my Column with dry ice and Isopropyl, I have also chilled my collecting chamber just the solvent was not chilled. Then I filled my column with the dry trim set it under vacuum and filled the column with gas. Then I had let it sit for about 10 minutes and opened my ball valve to the collecting chamber. The next step was the filtration, I have a bottle top with 0,2 my. After filtering I let evaporate the butane on a heating mat at about 25-30°C (77-86f)
From 100g trim I got about 6g extract so that yield for just sugar leafs was not to bad I guess.
That was the first extraction, the second one started with the frozen nugs. Ive done the same procedure as before. First time ive let it set for about 15 minutes. After evaporation I recognized that I had very less yield. So I made a second run on this material and let it set for another 30-45 minutes. The color was different and after evaporating I have seen that the second pass was way more “oilie” than the first pass, so I guess the second pass has been more Terps? Might it that be?
I don`t exactly know the weight from the plant because i straight froze it after chopping but I also dried some and they all had about 30-40 g. My yield was about 1,5g of oil from that one.
Third extraction I have done the same again just let it set in the column for over an hour.
Again about 30-40g.
Then I started purging. I do not have an extra vac chamber for purging I just use my collecting chamber. I put a blind cap on the part which is normally attached to the column. Then I put my collecting chamber on the heat mat and pull vacuum. Every 30 mins I opened and whipped my oil. I cannot adjust the vacuum so I just pulled full vacuum and was about -0,9 bar (-6750mm hg).
What I have seen when I opened my chamber after purging that there was a gas in the chamber which has not been butane. So is my pump really to strong and pulls the terpenes out of the extract?
With the trim I tried to make shatter which worked really great, ive read that I should use dried material for shatter due to there are not as much terps present as is fresh frozen material. The shatter is not the most clear it
s a bit dark but the consistency is really as I wanted, you can really break or pull and snap it at room temperature. Only the potency is missing somehow I guess. Compared to my buds my extracts really suck... The fresh frozen extract has crumbled, now its kind a waxy crumble. It tastes really good like limonene but again the potency is just not the best.
So now a few questions from my side:
What do you think is the problem with the low yield? Only butane use or did I let it set to short in the column to extract everything?
My plants had been frozen for about 2 months and some ice crystals had been on the buds before I have extracted them might that be a problem?
Is there a difference between the butane you can buy at bbv as a solvent and the butane/propane which is for camping grillers?
Is my pump too big for my chamber, how much vacuum should I pull while purging?
All in all I have learned a lot with my first passes. I know where I can upgrade my extractor and also really confident for my next runs. I hope I have not forgotten anything
And already thank you for your information and help. If you don`t understand something just ask me, sorry English is not my main language so I’m not sure if everything is understandable.