Graywolf
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Here are a couple bulk subzero ethanol extraction systems that will be featured in The Alchemist Resource blog site when it launches 11-1-2017. One uses a mag drive pump to circulate -50C ethanol through a column of material, while the other uses air or nitrogen pressure to transfer the liquid back and forth.
Both use dry ice to chill the ethanol:
Both use dry ice to chill the ethanol:
