The boiling point of mescaline freebase is 180°C at 12 mmHg, not at atmospherical pressure.
Ref: https://www.thevespiary.org/rhodium/Rhodium/chemistry/mescaline.alkaloids.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/mescaline.alkaloids.html)
I just noticed that the poster above left out the introduction and credits to the author of the extraction document... Shame on you, Prdy2GO!
San Pedro Alkaloid Extraction For Dummies
v 1.3 - Oct 2002
by Murple
Note: The title is intended as a bit of tongue-in-cheek humor, and should not be taken to mean that this recipe is easy enough to follow without some basic knowledge of chemistry. You can die.
Introduction
This technique is based on information gleaned from K. Trout's canonical cactus tome, "Sacred Cacti," supplemented by suggestions from Alexander Shulgin, and a few real world observations by anonymous researchers. Using this technique, a non-chemist should be able to produce fairly pure alkaloid crystals from San Pedro cacti using common chemicals and household equipment. This technique is designed for simplicity and ease, and will not give the maximum possible yield nor the highest quality results. If you're after every last milligram of alkaloid or you want perfectly pure mescaline crystals, this is not the recipe for you. Of course, if you had the skills and supplies to go for such goals, you probably wouldn't be downloading "how to extract alkaloids" documents from the internet.
Supplies
The supplies needed for this extraction are fairly simple to find and quite cheap. In addition to the cacti, you will need xylene (available in the pain stripper department of your local hardware store under brand names such as Xylol). You will need a strong base such as sodium hydroxide. You will need an acid, such as citric acid (available as a pure powder, sometimes called "sour salt" and found in the kosher section, at many grocery stores) or hydrochloric acid (available from hardware stores as a driveway cleaner or muriatic acid), or even vinegar (which is dilute acetic acid). I would recommend using citric acid as it is much safer than hydrochloric acid. While you could probably use tap water, I would highly recommend using distilled water for all procedures.
As far as equipment, you will need at least large stainless steel pot, a pyrex baking pan, a large glass jar with a lid, some sort of straining cloth, and a good sized (1 liter) pyrex measuring cup. You will also need some kind of layer separator. A separatory funnel woul be ideal; you can make do with a turkey baster, eye dropper, or glass pipette, but these will take much more work. It may be possible to bypass the need for a separatory device by taking advantage of the freezing points of xylene and water (see discussion under step 2). A supply of pH papers is essential.
Do not use any plastic equipment for any steps involving the use of xylene, as the xylene will most likely extract some of the plastic. This could result in having undesirable plastic byproducts in the final extract, with unknown safety implications.
The rest of the document:
Post 395568 (https://www.thevespiary.org/talk/index.php?topic=9281.msg39556800#msg39556800)
(Prdy2GO: "Get some clean xylene", Methods Discourse)
Post 395569 (https://www.thevespiary.org/talk/index.php?topic=9281.msg39556900#msg39556900)
(Prdy2GO: "Base it", Methods Discourse)