Well advise.. Never do this technique indoors....
A friend and I were making BHO with 4 oz of reggg...
We used PVC pipe and with caps on both ends and coffee filter with holes drilled on one side.. Other side had one hole for butane...
We used a glass cooking tray to collect....
After about 5 minutes of extracting the Fucking thing caught on fire ... All the pressure within the PVC was still forcing out butane... We were kicking the thing around my house before it went out.. Burnt half the carpet in my living room...
I learned to do it outside!!
I think the pilot for my oven caused it all...
I stopped doing that technique because ALOT of people say it is bad for you!! I never noticed if it was bad.. Just know it had alot of THC...
But if you know how to extract all the butane once done.. I am all ears!!!
your first mistake is doing it indoors. first lets think about what we are using.
butane is a highly flamable gas which is used in almost all lighters. when kept under pressure or below 31 degrees (not sure if this is exact) it will remain in a liquid state. butane is highly flamable as both a gas and a liquid and as a gas is heavier than air. this means the butane will boil off your collection plate if placed in a warm water bath. as the butane boils, the gas cascades down the sides of the pan and pools in low areas. open ventilation is key to dissipate this gas and prevent any build ups. there should be no open flames or running electronics in the area. i always do it outside and you should too imo the outdoors is the only place with sufficient ventilation to feel safe.
your next mistake was to use pvc pipe. this will leave chemicals in the BHO from the plastic which will be stripped by the butane which remember is a solvent. the best materials for extraction tubes are stainless steel and glass and sometimes copper only if you clean the tube thoroughly with solvents after each use.
so the science behind it is that we dissolve the lipids from the material (cannabinoids and terpines) with the butane, collect the solution, boil off the butane, collect the residual cannainoids and terpines, and then make it into a wax like consistency.
now in order to remove all the solvent (butane) from the solution, the purging process must be effective. there are two methods to remove the butane from the solution. the first method is with heat now this is easy in the initial stages of purging because the solution is not very viscous and the butane bubbles can escape easily. once 95% of the butane has boiled off what you are left with is very viscous and the bubbles have a slower time escaping. at this point many people wax it and call it done which will lead to some butane still being trapped in the end product. now the second method of purging is with a vacuum. instead of finishing when 95% has been purged it is best to place your solution in a vaccum. when this is done the bho puffs and bubbles up as the remaining butane is purged. i do this at least five time for at least five minutes each. it helps if the bho is heated slightly to lower the viscosity.
the thing about bho is it is a chemical extraction rather than a physical one( bubble) and you must have some idea what you are doing and must use your brain. using improper tools (wrong material extractor, low quality butane, etc.) and incomplete techniques can leave residual butane or other chemicals in your end product. while this is a simple process to learn it takes some time and thought to master. if you are the kind of person who likes to half ass then buy some bags and throw your shit in a bucket with some ice, stir strain and dry. if you want the most potent hash oil possible then run bho. but above all if you want to ake bho DO IT OUTSIDE, NO EXCEPTIONS. the last thing we need is you someone on the news for blowing themselves up. be safe and use your brain.