Help! Butane always left in material column!

[Curious_Roberto]

Then you just need to either recover more, or write off some losses.

How to get cold butane completely out of material column?

I’m running into an issue with my butane getting stuck in my material column and I am losing like 1-2 lbs each run. How do I get as much possible into the collection pot? Nitrogen push at the top of the material column doesn’t seem to be effective. If I circulate cold alcohol through my base would that make it easier?

There’s a thread about this exact question