Making Dry Ice -

I assumed you would use something like a coil of copper tubing to shoot the CO2 vapor through and just directly chill a well insulated box. You might fill that box with acetone as a heat transfer medium or you might just use air.
 
Jeff,

Thanks again. Now that we've established the heat exchanger, what - based on your experience - would the approximate temperature be that the steel would be exposed to within this heat exchanger? Lets say the liquid media is L1 kerosine or acetone.

Roger
 
I haven't done it myself, but I've done similar things in physics labs. Here is some text that I found on the net describing a commercial freezer that uses liquid CO2 for flash freezing food. I think that you can get lower than the -110 degrees fahrenheit they quote, that is just a practical limit for their application. This gadget is cute. It uses a regular pump and freon system for initial cooling and the liquid CO2 to get it frozen in a big hurry:

"DriCO2 from Carbonic International Inc. combines the features of a mechanical refrigeration-type recooler unit with a cryogenic flash freezing unit using liquid CO2 at temperatures of -110°F = -79°C). The cabinet has a high gloss stainless steel finish inside and out, and the door can be constructed from low temperature glass or tainless steel. Capable of being used as a holding cooler, precooler or cryogenic freezer, the unit will not change the shape, texture, color or aroma of food. "
 
Ahhh...cryogenics....this takes me back to physics in college. I remember a professor stating that liquid nitrogen can be produced at a cost less expensive than beer. ...and I remember in those days, saving my pennies for beer. You see, one of the local bars on Campus had "penny pitcher night", and another bar had 50 cent buckets. Yep these were 5 gallon buckets of warm swill that brought joy and happiness to those ol' college days.

Come to think of it...that's about all I remember from college. :( :D

So instead of dry ice, how about liquid nitrogen?

my 2 pitchers....eh,... I mean 2 cents.

Take care,
Rob
 
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