BHO as Starting crude

We receive our crude in 5 gallon buckets of BHO.
Couple of questions

  1. As with BHO there is trapped Butane in the crude. We would like to quickly and simply remove the butane before processing. Can we use a vacuum oven at high vac and low heat without exploding?
  2. Is there a vac oven that can take a 5 gallon bucket?
  3. We meticulously follow your SOPs for distillation and remediation. Is there anything different with BHO vs conventional alcohol extracted oleoresin.
    Thank you,
  1. How much butane?
  2. @Sidco_Cat
  3. Same same, gotta winterize like a warm etoh extraction

Just what’s normally left after BHO extraction. If you try to smoke it without purging ithe butane it sparks, snps and crackles. In small batches mild heat and vacuum do the trick. We have over 4 gallons, 17 liters, of BHO crude in a bucket when we receive it. I will do everything else exactly to your specs. My biggest problem is getting the Butane out of the BHO before I begin your processes.

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We oven purge our crude also, but didn’t really think too much about it before. Would it make much of a difference if you weren’t to? I dissolve the crude in warm ethanol in a stainless steel induction pot/burner, would the butane remove itself during that?


I’m sure it will cook out when you decarb


Dump alchol in th e bucket and start your dissolving of the crude and the butane will go byby, i do it everyday.


Dissolve and go I’ve done the same as Concentrated Humbold


If you add etoh like you are going to winterize all the trapped butane can escape.



I add 90f etho to mine and mix for a few minutes and it has worked for me

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You got your etoh answer, which sounds like it will work better with your SOP! :+1:

As per the vac oven question: yes no problem, a tvo-5 or two would do the trick depending on how much time you have. Vac ovens need surface area, so account time for pouring from the bucket :persevere:, purging and flipping the slabs.

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I think its worth measuring and monitoring the residual solvent levels throughout the process on a few batch runs since the CA testing limits for residual solvents apply to all products. My concern is less with the (hopefully) low levels of residual butane and more with Isopropyl, Ethanol & Heptane used in post processing.

The limit for Butane, Ethanol, & Heptane is 5000 ppm. Isopropyl is much lower with a 320 ppm limit on inhalable cannabis products.

We have seen distillate samples with failing residual solvent levels and though its possible to remediate it will take time, money, and slow down getting product to market.

A few QA tests early should help prevent regulatory QC issues.

ouch! at 320 ppm it’s quite easy to fail simply by not paying attention when cleaning your gear.

I just got back results on an out-sourced, non-winterized, live resin run that was at 247ppm for Isopropanol. The only place they could have gotten that from is from their cleaning SOP which swabs everything down with Iso before they play.

When Oregon instituted residual solvents, CO2 operators went through the roof. Many (most?) of them were failing at 5000ppm EtOH. They complained so hard that Oregon initially dropped ALL alcohols from the residual solvent list. They quickly came to their senses (sort of) and reinstated the 5000ppm for Iso, MeOH, and Butanol, but have NO limit at all on residual Ethanol.


I love the like-mindedness in this forum. I was thinking about how to purge out the Butane and thought about dissolving in a small amount of hot anhydrous ethanol then rotovaping down then I casually scroll through Future4200 and it’s already here! Reminds me of the ‘Simpsons did it’ episode of south park.

I have not yet had a chance to try this out, so my main question to those that have is what is the consistency of the oil, is it still shatter like or is it close to an oil at that point after everything is ‘purged’? And have you performed residual analysis for butane, how thoroughly does it remove it?

If you just dissolve in EtOH then evaporate, final consistency should be almost identical to starting material.

In the case of BHO as crude for distillation, the recommended protocol is to bring up in Ethanol at about 10:1 and throw it in the freezer to ppt the fats and waxes. filter or centrifuge those out, then evaporate/recover ethanol.

That WILL change the consistency. Usually towards a slightly more viscous product.

The next step is to decarboxylate. which can be done at the same time you’re recovering the ethanol. after decarb, the oil is usually considerably less viscous.


Hey so quick question, just starting up my own spd. From what i understand, you can open blast raw material with butane, purge that mix over open heat slowly, then mix with 10:1 etoh and filter with a bucnerr filter, decarb it then put that into my spd ?

No, dont do that.

As long as its not a flame, and u got plenty of ventilation


Why wouldn’t you recommend blasting in a tube such as the green machine by johnnys green extractions? I only have access to dried and flash frozen material so i need to make crude thats distillable without too many chemicals.

Do it in a closed loop. We don’t try to support “open blasting” around these parts. That’s how you go boom, and blow up your apartment and stuffs… No bueno…


Whats the minimum $ to get into closed loop? I thought those extraction machines were $$,$$$-$,$$$,$$$

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