Building a CO2 Thermosyphon: Tips for Compressing Gas to 7MPa Pressure

[Avis]

Is there a way to build a rig so that I could compress CO2 gas to apressure of roughly 7MPa?

I am building a CO2 Thermosyphone and need high pressure CO2 in order to get convection to occur.

Any help or advice would be greatly appreciated

 

[Enthalpy]

At 70b it liquefies at 300K.
http://encyclopedia.airliquide.com/images_encyclopedie/VaporPressureGraph/Carbon_dioxide_Vapor_Pressure.GIF
Are you pulling our leg?

 

[Q_Goest]

If you only need a relatively small amount, high pressure cylinders would be the way to go. If you're an industrial user, purchasing it as a liquid and maintaining it in a refrigerated liquid storage tank is common. The liquid can be pumped by a single stage reciprocating machine.

Talk to your industrial gas supplier to see what's best for you.

 

[Avis]

At 70b it liquefies at 300K.
http://encyclopedia.airliquide.com/images_encyclopedie/VaporPressureGraph/Carbon_dioxide_Vapor_Pressure.GIF
Are you pulling our leg?

Exactly high pressure will cause CO2 to liquefy thus at roughly 31 degrees it will change state and evaporate.

I am a student and I am building this as part of my degree project. We do not need much. We have a very limited budget. I haven't had any experience in doing this so I'm basically learning from scratch.

 

[Enthalpy]

Buy CO2 ice cold at 1atm, enclose it (with free volume!) cold at 1atm and warm it enclosed to room temperature so it gets liquid+vapour at 70b, use it.

You're aware that expanding the gas will cool it and the rest of the tank as well, are you?