What are the hybrid orbitals of CO2?

Can we mix liquid CO2 with compressed CO2 gas cartridge in brine solution in a vessel?

• Hi there, i want to expose my cement core sample with CO2 in a vessel by submerging the sample with brine solution. The matter is i want to expose it at high pressure and temperature.. The pressure will be 10MPa (1500 psi) and the temperature is at the range of 100 degF to 250 degF. As far as i concerned, the maximum liquid CO2 tank pressure is only 950 Psi. As such, in order to increase the pressure to 1500 Psi, i plan to inject compressed CO2 gas by using CO2 cartridge to increase the pressure from 950 psi to 1500psi. Is this method is applicable to mix up liquid CO2 with CO2 gas? If possible, i dont want to use pump to save cost. Another thing, is there any dangerous if we pressurize and heat up a vessel with this T & P range by injecting CO2 in a vessel with the presence of brine? Hope to hear any comment from your side. Tq in advance for ur answer.

• Answer:

  YES IT WILL BE DANGEROUS to inject liquid CO2 at RT and heat, at least you risk blowing the rupture disc [I hope you have one !]. You could get a pressure much higher than intended. You could add a calculated amount of CO2 at RT and heat slowly while watching the pressure very closely. You may need to do several experiments to get the right amount of CO2. The cylinder will only give you the vapor pressure of CO2 at RT - DO NOT HEAT IT OR YOU WILL BLOW THE RUPTURE DISC. Be warned that the critical temp of CO2 is 31 C so it will be exceedingly nonideal around RT. So use actual data, NOT the ideal gas law. See http://webbook.nist.gov/cgi/fluid.cgi?T=250&PLow=0&PHigh=1500&PInc=100&Applet=on&Digits=5&ID=C124389&Action=Load&Type=IsoTherm&TUnit=F&PUnit=psia&DUnit=lbm%2Fft3&HUnit=Btu%2Flbm&WUnit=ft%2Fs&VisUnit=lbm%2Fft*s&STUnit=lb%2Fin&RefState=DEF But note that the vapor pressure will be depressed by the presence of water. The salt will decrease the reduction in pressure, compared to pure water. I would not attempt to calculate the effect, though. I would calculate based on pure water, run that experiment, expecting to have to abort for high pressure before 250F, and run another experiment, adjusting the quantity of CO2 to suit. THe hot water and salt will be somewhat corrosive, and adding CO2 will make it more acidic. I hope you are well familiar with high pressure testing; it has many unexpected hazards. I worked in that field for ten years. We did everything behind 1/2" steel plate.