Do soft drink machines in food establishments use liquified CO2 or is it in another form?

Hi Wesley: I knew this but here’s a quote:
“It is used in many consumer products that require pressurized gas because it is inexpensive and nonflammable, and because it undergoes a phase transition from gas to liquid at room temperature at an attainable pressure of approximately 60 bar (870 psi, 59 atm), allowing far more carbon dioxide to fit in a given container than otherwise would.”[1] So at 20 °C and ~60 atm pressure CO2 is a liquid [see phase diagram on left in ref [1]) and fresh cylinders of CO2 in beverage machines almost certainly have liq CO2 in them (the pressure can’t go above 60atm). I use to make one of my starting materials under 200 atm CO at RT, 400 atm at 320 °C rxn T so it easy to compress gasses to 100 atm or more.
There is now an extensive switch in industry to use liq or supercritical CO2 as a “green solvent”. You carry out the desired rxn under high pressure CO2; after rxn is complete cool and reduce the CO2 to atmospheric: collect and recycle CO2 leaving the product as a solid in a rxn flask (I’ve seen it done shown on slides and it is amazing). CO2 is cheap and nontoxic. A good example of this use is that the decaffeination of coffee is now carried out by extraction with CO2(l); a process that was previously carried by extraction with CH2Cl2.
Cheers, drp

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