Butane too cold?

Had an interesting time doing my concentrate run today. I run a closed column extractor from BVV which usually holds about 160g. Anyway, I was running my cans through it and was keeping them at subzero temps in a cooler with dry ice, well that didn't work out as I had anticipated.

When I went to run the butane through the column, it shot everywhere but into the column, I've never had that happen before except this time that I decided to freeze it with dry ice. I guess I'm just looking to see if anyone has an explanation for this?

The logic of course was the colder the butane was, the longer it would stay in liquid state, the more liquid butane I'd run through my tube vs gaseous.

Also a fun anecdote and word of precaution for canned butane...

Had to abort a work sesh after having filled my cooler with dry ice and butane cans, popped the whole thing in my flower room. Couldn't get to it for the weekend. When I opened the cooler on Monday six cans were nearly entirely empty and a cloud of butane wafted from the cooler. My heart stopped.

Needless to say it didn't explode, but I'm assuming the rapid change in temperature resulted in a huge jump in pressure which released the gas from the cans. I hope I'm not alone in having never considered that a possibility and maybe I can prevent someone else from making a similar mistake...

Gotta quit these cans, anyway.

The first injection of cans into a closed loop system should be at ambient, to pre-distill it so as to remove mystery oils.

Hold your collection pot temperature below 85F and don't recover beyond zero gauge/atmosphere, so as to leave the pentane behind.

Only after you've cleaned your collection pot of the deposited mystery oil, are you ready to drop the temperature of the LPG.

The seals on cans are not suitable for subzero temperatures. The LPG pressure in the can will also be low to non existent, and the viscosity will be higher, making it harder to push through the small can nozzle.

I think your issue is that theres no pressure, fade typically runs an active system and even with that itll be slow with the lack of pressure and cold lpg. With a colosed system you have a recovery tank so you should distill into there. and then youre probably gonna actually need two tanks. One with cold lpg and one with warm and you need another hose and you run the warm into the cold and then into the column and youll have some pressure. And you should use the dry ice on the collection pot to help draw in the lpg. For passive the coldest part needs to be the collection pot, or else the lpg wont flow without head pressure.

run a warm tank into the vapor end of a recovery tank full of cold lpg, Itll push all the cold lpg out the liquid end. nd dry ice can get things much colder than necessary and gel up the lpg, fade suggests around -30 so thats probably enough.