I know Im coming in a bit late in the game guys, but if the question is one of how to process a ton of herb into oil, one can do so without using a ton of butane. You can just run the huge amount of trim or popcorn or whatever through a bubble bag setup or dry sifter, and then process the collected keif through a butane extractor. One uses less butane because youve mechanically done have the extraction anyway.
To plagiarize myself:
"Process one: Making your hash into hash oil
The big problem with making large amounts of honey oil is that you have to use huge amounts of pot, and stuffing huge amounts of pot into 1" diameter tubes is like, waaaaaay too much work, man. So take those huge amounts of pot, and either run it through some bubble bags, gumby it, or dry sift it, so that what you are left with is mostly trichromes. Doesnt have to be the cleanest hash, thats why dry sift will suffice, it just needs to be less bulky. Once youve collected your trichromes, allow them to dry, and DO NOT PRESS THEM TOGETHER. Once dry, load your BHO extractor tube, and continue just as though it were herb a la [LINK REMOVED]. The only difference between extracting this and the pot will be in the (proportionally) increased gains per tube. In actuality, what youve done is allow the butane to carry the least of the extraction, the last purification from already somewhat mechanically purified pot, letting you use less gas.
Process two: Liquid solvent extraction.
Some of you have tried ISO or alcohol pot extract, sometimes called oil, but universally it is a green/black glassy substance that is moderately potent and is harsh as hell. Why makes this so different from honey oil, which is fragrant, yellow to amber, and extremely potent? Chlorophyll. The plant pigment burns, making carbon, hurting your throat. It changes it from a chunky oil to a glassy tar. It masks the scent. Worst of all, it dilutes it. Then why make it? Its easy. Its cheap. So we are going to start with cheap ISO, and remove all the impurities from it chemically.
First we will make some ISO extract. Take your pot and grind it then put it in a large jar(s). Cover it with at least 70% isopropyl alcohol. Close the jar, and wait a week. You will have a dark green/black liquid. Using a cotton cloth or muslin cloth, strain out all the herb (squeezing the last drops out) and save the liquid in a large baking dish(s). Allow this to evaporate outside. It will do so quickly. You will be left with the aforementioned glassy black tar.
Now comes the fun part, where we make this barely smokable crap into awesome. Get some pure naptha, and put it in the freezer for at least a day. Place the tar in the freezer, too. This will make is more dense and easier to shatter. Once it is frozen, powder it. Chopping with a cold knife on a cold glass cutting board worked best for me. Once you have a fairly fine powder (2mm balls or less) Fill a clean jar halfway with the now very cold naptha. Working fast, while the tar powder is still cold, throw it into the jar, and wait for it to sink to the bottom. Then, add an amount equal to the naptha of room temperature pure H2O. Close the jar, and shake furiously for as long as the naptha remains cooler than room temp.
This should last for ebout 20 minutes in a 65 degree fahrenheit. During this time, the tar will dissolve in the naptha, and the chlorophyll will be pulled into the water. The reason for this is that chlorophyl disolves weakly in cold naptha, but very well in warm water, and the oils that we want disolve well in cold naptha, but not at all in water. The trick is knowing when to stop. If the naptha gets too warm, the chlorophyll will start to dissolve back into the naptha. Once the jar starts to get closer to room temp, put it in the freezer and allow it to rest for an hour or so. The water and the naptha will settle into two distinct layers. Carefully remove and discard the water with the chlorophyl, and keep the naptha. If there is still chlorophyll in the naptha, you should freeze it again for a day, add another equal measure of lukewarm water, shake furiously, freeze, and remove the water layer. do this as many times as necessary until no chlorophyll is visible. Once your naptha layer is the palest yellow. decant it into a baking dish and allow this to evaporate outside for several hours.
You will be left with a chunky oil. This should be cured to remove any trace solvents. Do this by floating the tray on a boiling hot water bath just until the chunky oil becomes free flowing and thin, just before the boiling point. Once this is achieved, freeze the tray until the oil is solid again. Repeat this process several times."