Residual solvent when extracting with heptane denatured ethanol

[downtheterphole]

depends on your recovery temperature/vac level. you may have recovered that volatile heptane down to an acceptable level.

Ethanol Azeotropes - Attn: EtOH cannabis extractors!

I am writing this to help those of you performing alcohol-based cannabis extractions, and especially for those playing around with n-heptane-denatured ethanol, isopropanol, and other less expensive alternatives to 190 proof potable ethanol. Please understand that drinkable 190 proof ethanol, isopropanol, and n-heptane denatured ethanol are very different animals. I strongly advise people to reclaim and reuse solvent as much as possible, rather than just buy cheaper solvent. 190 proof potable e…