Best bet for diy jacket chilling is to use methanol or any other solvent/fluid that can hang with dry ice temps in a bucket filled with dry ice. Place a injection coil in that bucket and run your chilling fluid through the coil and into your vessels chilling jacket. You can find pumps (AODD, centrifugal, mag drive or alike) to move the chilling fluid. Just make sure they are rated for the temps and fluids used. Definitely going to be inefficient compared to a properly sized chiller but it will work. You can do the same thing to cool your extraction solvent.
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