The unit operations that turn plant material into a specified product: choosing an extraction platform, short-path and wiped-film distillation, solvent recovery, winterization, decarboxylation, crystallisation of isolate, preparative chromatography, and capturing the terpene fraction before heat destroys it.
9 pages · 32 citations (32 without a resolved identifier, marked on the page) · updated 2026-09-27
What this section is, and what it is not
Education and harm reduction. Not medical, legal or financial advice. Every factual claim carries a source; contested and single-source claims are marked as such on the page.
The boundary. This section teaches separation, purification, formulation, dosing arithmetic and analytical chemistry with real parameters, because withholding that detail from someone who will proceed anyway is the harm this library exists to prevent. It does not publish preparative routes for converting one cannabinoid into a more intoxicating one; those are described structurally and cited to the literature, without procedures.
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The comparative decision every processor makes first: CO2, ethanol, hydrocarbon or solventless. The platform sets yield, selectivity, terpene retention, capital cost, the fire and licensing burden, and — decisively — which downstream operations you are then obliged to run.
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Batch vacuum distillation of cannabinoid crude: why deep vacuum is what makes it possible at all, what every part of the apparatus is for, the fraction cuts in order, what a second pass actually buys, and how to manage total heat history so the product does not arrive with an isomerisation and oxidation history printed on its COA.
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The continuous alternative to the batch flask: feed is spread as a thin film on a heated wall, residence time drops from tens of minutes to seconds, and heat history per molecule collapses. What that buys, what it costs, and the volume threshold at which the industry switches.
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Solvent recovery treated as its own discipline rather than as a chore: the bath, vapour and condenser temperature relationship and the delta-20 rule, controlled vacuum ramps, fill fraction and rotation, why bumping happens and what it costs, recovery percentage as the economic driver, and the hard limit of what a rotovap can and cannot remove.
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Dewaxing crude by differential solubility at low temperature: the ratios, the hold temperatures and times, cold filtration and why letting the filtrate warm undoes the whole operation, the yield loss to expect, and which extraction platforms make it mandatory.
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The one deliberate chemical change in the processing chain, run as a process: first-order kinetics with a steep temperature dependence, the time/temperature trade and why published curves disagree, how to know when it is finished, the 0.877 arithmetic, and how continued heat turns a finished batch into a CBN product.
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How CBD isolate is actually made: solubility against temperature, supersaturation, solvent systems, seeding to control nucleation and avoid oiling out, the slow-cool versus crash trade and what it does to crystal habit and occluded solvent, filtration, cake washing, vacuum drying to a residual-solvent specification, and why CBD crystallises readily while most minor cannabinoids do not.
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What each technique separates and when a processor actually needs one: flash columns for removing a specific impurity, preparative HPLC for minor cannabinoids and reference-grade material, and centrifugal partition and countercurrent chromatography for gram-to-kilogram separations at low solvent cost. Plus the reason a lab with preparative capability can make its own reference standards.
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Capturing the volatile fraction before heat destroys it: why terpenes are lost first in every thermal operation, cold trapping ahead of the distillation body, vacuum stripping as a deliberate first cut, steam distillation of botanical and cannabis material with the operator Helichrysum yield data, hydrosols as the aqueous co-product, cannabis-derived against botanical terpenes as products, and the input-versus-output terpene panel that tells you where your terpenes went.
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