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About BHOldman

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  1. It is not absolutely necessary to pull a vacuum on a closed system. While a vacuum might initially help a small bit, by pulling the first bit of gas in, it would soon be exhausted by the expanding gas. The main reason to pull a vacuum is to remove oxygen from the entire system. After that small initial vacuum is exhausted, you should not try to pull additional vacuum, as this would pose a serious explosion risk. After the initial vacuum is exhausted, a closed system is manipulating by, and made to operate, using only temperature differentials. An easy rule to remember is that a gas will always move from a warm area, to a cooler area. That said, if you cool your receiving vessel, and warm your delivery vessel, the gas will flow, by itself, to the cold side. The receiving vessel could be pre-cooled, along with the extraction material, in a freezer, or you can simply place it into a bucket of ice (or dry ice), to keep it cold. At the same time, your delivery container needs to be warmed. This is accomplished easily with a common heating pad, or by wrapping the container in a hot towel . The process is not fast, so be patient. It is essential to understand that gas can extract essential oils from plant material, but this only can happen when the gas is in its liquid form. Therefore, it is essential that the delivery container be placed in an upside down position, with the valve on the bottom. This position allows the liquid gas to come out, instead of only vapor. Once you have allowed all (or as much as you want) of the gas to pass into your column, the first step of the extraction is complete, all your liquid gas is in the splatter platter, along with all of the extracted compounds. Now, step 2 involves forcing the gas to leave your extract, and return to a storage container. This is accomplished in exactly the same manner as the gas delivery, using temperature differentials. The difference now is that all the gas is in the splatter platter. So, we place the entire extraction rig into hot water, move our transfer hose from the top of the column, where our extraction sample is located, to a different port, located directly on the collection can. The storage (now receiving the gas) container is placed on ice, and the process occurs....gas goes from warm to cold. This splatter platter purge removal process will take a lot longer than the delivery process, because you are removing gas vapors and recondensing them to a liquid, instead of directly moving liquid around. Most collection chambers have a sight glass, so it is easy to see when all of the gas has been removed. After all the gas is removed, the splatter platter can be opened. You will see all the wonderful extract that you just made, but it can't be used yet. it must still be purged of unseen residual gas. But that is a completely different topic.
  2. OK, this topic is old, but I recently bought the best vaporizer that I have ever used. Take a look at the Dr. Dabber SWITCH. While I can say that it is a handheld unit, it is definitely not stealth. This thing is amazing. It runs from a rechargeable battery, so it is completely portable (I know that nobody would dab while driving, but you could). It has a large selection of settings, to set things just the way you want them. It has the ability to vape either dry herb, or oil (separate settings). I quit using my e-nail....this thing beats it easily. Takes around 5 seconds to get a giant dab. No torch, no cord, no loose pieces. Works by heating a metal can (the vape chamber) using an induction coil.
  3. This topic has existed for too long, with no responses. Alcohol is a generic term. There are many different types of alcohol, each having a different name, and somewhat similar properties. Methanol, Ethanol and Isopropanol are some of the most common alcohols, but are only a few examples. Ethanol is the kind of alcohol found in drinks for human consumption (drinking alcohol), and is the prefered alcohol for essential oil extraction. Extractions with ethanol are safe for human consumption, immediately after extraction, without additional processing. However, extractions performed with Methanol or Isopropanol are not safe for consumption, in any manner, until all traces of the solvent have been purged. It is strongly suggested that ethanol be used. Advantages of Ethanol extraction: High proof ethanol is readily available. Ethanol is not explosive. Storage requirements for ethanol are minimal. Ethanol extracts are safe to consume, even with high ppm residual solvent. Disadvantage: All alcohols will strip cannabinoids and terpenes, but they will also strip off other undesirable substances (like chlorophyll), resulting in a slightly lower quality extraction. These undesirable products can be removed, to some extent, but it requires extra steps. So......a quick answer only, there is more to know......maybe others will add more info.
  4. Post-mortem look: There were a lot of factors that contributed to the failure of this extraction. There are probably many more, but it is embarrassing enough just to recognize these. 1. There was too much plant material in the flask. That thing was stuffed way too full. This made the initial volume of space for alcohol somewhat limited to begin with. 2. As the alcohol boiled, it was being removed entirely, and recondensed, constantly decreasing the amount remaining in the flask. This reduction in the volume of the alcohol was not accounted for in any way. 3. Enough alcohol was eventually evaporated away, so that not enough remained to keep all of the plant material equally wet, and therefore the heat was not being dispersing evenly throughout the flask. 4. As the alcohol volume decreased, there came a point where vapor pockets were forming. This vapor pocketing allowed the glass to become unevenly heated. 5. The gas stove burner's flames were high, resulting in very violent boiling. 6. The glass flask was directly heated by the flames, not through any heat transfer device, so raw flame was contacting the glass, but only in some places, not uniformly. 7. The process was complete way before that "TINK", this should not have happened. 8. That young man was REALLY baked, chemistry requires some clarity. Ahh, the folly of youth, you know it all....until you don't. Oh yeah, I forgot the biggest blunder of them all......a gas stove, with an open flame......damn, I'm glad that young man grew up.
  5. I am an old man, and have been doing extractions for a LOOOOONG time. The following is a true story, no names are used, to protect the terminally stupid. Many years ago, in a land far, far away, there was a young man that wanted to cook up a BIG batch of what he called oil (crude and dirty by today's standards, but still oil). The young man had made oil many time before, so was quite confidant in his skill and technique. Cocky son-of-a-bitch, you might say. Well, this young man had made many small batches, and everything was good. This got him wondering about making larger quantities of this wonderful extract. At that time, dabbing and titanium nails were non-existent, so oil was either smeared on a paper and rolled, smoked directly from an oil burner (you would call it a crack pipe today) or chased around on aluminum foil, with a straw. In any event, no matter how you consumed it, that oil was magnitudes better than even the very best weed available (this was even before the appearance of "sinsemilla"...the start of seedless cannabis) ) So, that stupid young man went out and picked up a few pounds (BTW, a pound of seedy dirt weed used to cost about $100). Now, mind you, there was no internet, and you sure couldn't go ask the librarian for help, so there were basically no reference materials available, except real chemistry manuals. Everything that was done was experimental. Therefore, that young man, using his chemistry knowledge, was using isopropyl alcohol for extracting. Now, this was not cold isopropyl, nor room temperature, not even just was boiling 99% isopropyl alcohol. Ok, so if that doesn't sound dangerous enough all by itself, add a gas stove with open flame and it kicks up to a whole new level. The young man had a nice setup, it was a true distillation rig, with a nice Graham condenser and flowing water cooling. It was all good. So the young man proceeded to do his large batch extraction. You need to picture a giant sized 5L Erlenmeyer flask, stuffed with a couple pounds of seeds, sticks, stems and dirt weed, now add a crap load of 99% isopropyl alcohol.....almost a gallon. This flask was tightly connected to the condenser setup, and it had been used successfully many times before. There were no loose joints, so no flammable vapor leaks. The condenser had great cooling water flow, so all evaporated solvent was being recovered. The open end of the system was routed to the outside, via a hose, so even if vapors did bypass the condenser, they dispersed away from the work area. That young man thought that his system was sweet, and it worked so well with so many smaller batches. What could go wrong? OK, so you do understand that the key culprit here is a giant container of boiling isopropyl alcohol, sitting just millimeters above an open flame. Now, the was tall, 9 or 10 feet tall, and the cabinets above the stove were so high that I could not reach them, without a tall step stool. The stove was located in a corner area, so it had a wall directly to the left. The floor, in front of the stove, was covered in carpet tiles. Overall, an idiot designed the place. So, back to the story.....Everything is going well. The alcohol is boiling nicely, and the condenser is doing its job. No vapors are coming out of the open end. Damn, that young man was so excited. This was going to be amazing. Then it happened.....TINK......what the fuck was that? Suddenly, an oval shaped crack appeared near the base of the flask. The whole side of the flask opened up, like a trap door. This resulted in another very uncomfortable that you should hope to never hear.....FOOM!!!! Suddenly the ENTIRE corner was on fire. And I don't mean a little fire......remember that the alcohol was boiling, the vapor pressure was tremendous. The entire stovetop was on fire. The floor in front of the stove was burning. The front of the oven was in flames. There were flames scorching those high cabinets. Flames were licking up the walls, to the left and behind the range. FIRE!!! FIRE!!! FIRE!!! So lets digress a little while, to understand what was going on in the house, prior to "The Incident". Well, the young man had definitely made oil, in the past, and he almost always had some, and he really liked getting baked. Well, there were 3 other young people in the house with him, so of course, everyone got really loaded, because why not. Additionally, while that young man was in the kitchen, doing his extracting, the other individuals continued to party. And I must admit that the young man really did not watch everything properly, stopping for a bowl periodically. Ok, so back to the fire....think of a really big bonfire, with flames 10 feet tall, in the corner of YOUR kitchen. Panic set the young man is frantically spraying water, from the kitchen sink, using the sprayer hose All the time, he is yelling to his friends, pleading for them to call the fire department. Remember that this was before cell phones, you had to use a land line. Now the young man is freaking out.....the whole corner is on fire, and the other 3 stoned fools are just standing in the doorway, watching the flames. Well, fortunately, the water sprayer did the trick, and the fire was stopped. But, oh the aftermath.....the high cabinets were scorched and blackened. The walls were blackened, and showed serious flame impact. The range was totally covered in a slurry of crappy weed, water and dilute alcohol. And all that definitely had been extracted, and it got on everything in the area, making the whole house smell dank for months. The carpet in front of the range was severely damaged by the flames, resulting in about a 5 foot semi-circle of burnt area. After all the excitement was over, I was pretty pissed that the others didn't call the fire department, or even help. When I asked them why, they responded in a way that only makes sense from the distance of lots of years, "Because you looked like you were doing a pretty good job".
  6. Kind of a strange question, but here goes. I have been using a metal vacuum pot with a PID controlled circular rubber heating pad below it. The heating pad is covered on one side by a slick paper disk, which is covering an adhesive surface. I have not removed this paper, because rather than being affixed to a single object, I would prefer that the heating pad be available for alternate uses. I have a stainless steel wool cushion that I place underneath the pad, to air-gap isolate the underside of the heating pad from whatever surface is below. There are many times when I will release the vacuum and open the pot, but I will usually not turn off the heating pad, because I want to keep the pot warm. During these times, my bare skin comes into direct contact with the metal pot walls. I never paid a lot of attention to that contact, because my focus was on the pot's contents. However, I eventually noticed a slight tingly effect, just barely there, something similar to what you feel when you get a static charged balloon close to the hair on the back of your hand, but a lot less. I got curious, so using a multimeter, I touched one prong to the metal pot, and the other to a known good ground. I was surprised to see that there was a 0.2V AC current flow. I don't know what the amperage is, as I lack a means to measure it, but it has to be quite low. I use the heating pad, paper side up, so that the paper is in contact with the bottom of the metal pot. My first thought was that there must be a hole somewhere, and that some stray electrical wiring from inside the pad was making contact with the metal pot. This is not the case, the paper covering is completely intact. The metal pot is completely isolated, it has no contact with any other metal objects or wires, even the vacuum line is not metal. Therefore, I have concluded that the current, that I can measure, is being induced in the metal pot by the magnetic fields surrounding the heating pad. I have not been harmed, and I don't believe that this situation is dangerous, but I also think that grounding the pot isn't going to hurt anything. I believe that by simply changing to a stainless steel braided vacuum line, a ground will be established, and it should fix this. Has anyone else observed this situation? Any useful suggestions or comments (aside from "Buy a real vacuum oven").
  7. Hello world! I am located in Ohio, USA. I am an old man, born while Truman was prez........what???? Been smoking and making oil since the late 60's. Yeah, a long time.

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Strain Hunters is a series of documentaries aimed at informing the general public about the quest for the preservation of the cannabis plant in the form of particularly vulnerable landraces originating in the poorest areas of the planet.

Cannabis, one of the most ancient plants known to man, used in every civilisation all over the world for medicinal and recreational purposes, is facing a very real threat of extinction. One day these plants could be helpful in developing better medications for the sick and the suffering. We feel it is our duty to preserve as many cannabis landraces in our genetic database, and by breeding them into other well-studied medicinal strains for the sole purpose of scientific research.

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