is using a cold trap before the vac pump a must when working with ethanol?
Preparation of high purity “natural-source” cannabinoid fractions
Natural-source cannabinoid fractions were isolated from approximately 1 L of pooled methanol extracts, from about 50 individual samples processed in our lab. The pooled
extract was dried with anhydrous sodium sulfate, filtered, and the solvent removed on a rotary evaporator.
The flask containing the residual viscous, dark green oil was fitted onto a Kugelröhr molecular distillation apparatus with a receiving bulb, and evacuated to approximately 0.2 mm Hg. With rotation, the flask was gradually heated in the apparatus, and clear,
amber oil distilled at ~170 C. Yield was ~3.5 g. This amber oil was distilled a second time, yielding ~3.2 g of a yellow oil (Figure 3a; also 4a and b).
Further purification was achieved by centrifugal thin-layer chromatography, using an Analtech Cyclograph equipped with a 4 mm silica rotor (separation ‘disk,’ see Figure 4c).
The elution solvent (7.5% ethyl acetate in hexane) is pumped into the center of the rotating disk, and once it saturates the silica layer and spins off the edge, it is caught in a trough, and collected through a tube at the bottom of the device; the separation is
conducted under a blanket of nitrogen gas to prevent compound oxidation. Once solvent flow is established and flowrate checked, the mixture to be separated (in a small volume of solvent) is applied with the solvent pump, and components are visualized as expanding bands as they separate, by viewing the disk with UV light (Figure 4e).
The first solvent fraction contained Δ9-THC; solvent was removed on the rotary evaporator, and the residue distilled again on the Kugelröhr. GC/MS showed this material to be ~94% Δ9-THC and ~6% cannabinol, with very small amounts of other minor cannabinoids (Figure 3b; also Figure 4f). After this point this very viscous resin was transferred to vials or for
weighing by heating containers with a heat gun until the oil ran freely, to avoid introducing extraneous solvents that might distort weights.
Here is the recipe, good luck!
There are even pictures, for those not capable to read
Still, you guys have no idea about chemistry!
https://www.erowid.org/references/refs_view.php?A=ShowDocPartFrame&ID=7448&DocPartID=6594
I'm just going to keep updating the first 5 posts in this thread with possible relevant links or information. Probably will be a long process.
Might as well add these to the list, Snype.
Here's my favorite
http://google.com/patents/ep1133688a4?cl=en
And another,
http://google.com/patents/US7592468
There's a lot more, but it's all saved on my computer. I'll try and post them later.
Smart, smart, smart, that you reserved those early posts.
From the reading this process will only be good for my mistakes or sub par mass extracted material.
I personally love the taste and high of full spectrum extracts. I prefer BHO over CO2.
All products and product categories have their place.
Thanks for that paper Pastelero.
The cyclograph was particularly intriguing. The amount of product it can process is small but the fact that it can separate at room temperature led me to think that virtually pure THC acid could be produced easily.
So when are we going to see transparent shatter showing up on the market? Short path distillation is going to decarb the product so it'll always be runny but one of the types of centrifugal chromatography would separate the fractions at room temp. Cool.
RB
There are some people in my area sending thier co2 extracts through centrifugal chromotography. All I could think is, "I want to play!"