How to Convert THC Delta 9 to THC Delta 8

Delta-9-Tetrahydrocannabinol (THC)  is a naturally occurring isomer of THC found in cannabis plants.  It’s psychoactive effects are well known.  While delta-9-THC is the most abundant isomer of THC, there is interest in the lesser studied delta-8-THC isomer.


IUPAC Naming Convention

Detla 9 THC and other isomersThe diagram below has numbered positions on the top left ring structure.  If the double bond is at the 9 position then the molecule’s name is delta-9-THC.  If the double bond is at the 8 position the molecule’s name is delta-8-THC.


The molecule pictured is delta-8-THC for example.



The reaction

Delta-8-THC isomer can be made from Delta-9-THC in a spinning band distillation system.  Mix in 4% acidic alumina silicate with your extracted and winterized crude cannabis oil.  Distill the cannabis oil and collect the THC distillate as you normally would.  The combination of the acidic alumina silicate and boiling flask heat will catalyze the the rearrangement of the THC molecule from delta-9 to delta-8-THC.  The conversion rate should be at least 90 – 95%.

The effect

Delta-8-THC is said to give a less intense and longer lasting high than the delta-9 isomer.  Some are experimenting with different ratios of delta-8 to delta-9.  If you have tried delta-8-THC, let us know about your experience!


Warning – Lawyer Stuff

Use this information at your own risk.  Please use some common sense if you want to try this.  Find and SOP from a trusted source.  Don’t make your first attempt with a large batch of crude extract ($$$).  It may take a number of tries to perfect the technique.  Experiment with small batches that won’t break you if they fail.  Move up in batch size as your skill level and confidence increase.




  1. Thanks for the great blog and valuable information.

    Can I trouble you for help on the brand and item number you used for acidic alumina silicate?

    This would really help me.


    1. Dear Joe Schutz,

      You can get acidic alumina silicate from your friend in Woodland 🙂


  2. Hello,

    I’m a Army Combat Veteran with TBI, PTSD and tons of hardware now in my back. Is there any studies how it helps with TBI and PTSD?

    Also, could you please provide me with step by step instructions (recipe) on producing/extracting Delta 8 for vape pens, equipment needed, where to get the equipment, brand and item number of the solvents used?


    1. Hi,

      I do not have any evidence for its efficacy for specific conditions. Delta 8 does have a measured lower psychoactivity and anecdotally I have heard/read about people claiming it produces less paranoia and the other effects of an intense high.

      If you are interested in a start to finish process, you may be best off hiring a consultant. On this topic I really only know enough to get myself in trouble. I travel to many labs (and run many distillations), but I do not do this day in day out to know all the specifics.

      Here are some places to start:



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