Cooling a slurry with LCO2

[cyclopath]

@JonaaronbrayAzoth

You need to have a back pressure regulator on the jackets to keep steady flow of Co2 through the jackets. The minimum pressure you need to keep from freezing the Co2 is 75psi and your jackets need to withstand at least 200psi with a PRV on the jackets set to 180psi. The back pressure regulator can be simple needle valve on a manifold with a PRV and a pressure gauge.

May be where I got 75PSI from. Very smart man.

How much searching have you done on the subject?

@Zack_illuminated is another smart cookie, he looks at that same graph and ALSO sees 75PSI as the min

@Zack_illuminated

I tried to make a best effort attempt at getting some data on how much co2 was needed - as a baseline just to fill and chill one column. So after a quick gander at the triple point of co2 its obvious that if I wanted to transfer a liquid and not turn to dry ice it must be over 75psi so I did 100-120psi transfer with the tanks upside-down on a scale. Could watch the cold level rise as the transfer took place. Of the little bit of co2 I had to play with, 40lbs wasn’t enough to fill the column jacket but was instead just under half way.