cooling solvent

I already bought a regular 3/8 50 foot coil. Im gonna chill my butane on the way in using the coil and a dry ice bath. I was worried that the length of 1/4 in that first product might slow things down too much?
 
Butane gets thick at low temperatures, so 1/4" will be problematic. A single row of coils, so that it is self draining would be a better design.
 
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