Question

A phase diagram for CO2 is shown in the figure shown a) What is the phase of CO2 at T = 2-C and P = 500 kPa? (b) What is the phase of CO2 at T = -80C and P = 120 kPa? (c) For reasons of economy and convenience, bulk CO2 is often transported in liquid form in pressurized tanks. Using the phase diagram, determine the minimum pressure required to keep CO2 in the liquid phase at 20C.

7373 5707 Solid 516 1 Gas 101 78.5 -56.6 20 31 Temperature, T (C)

Answer 1

ans)

from given data

a) the phase of CO2 at T = 20 C and P = 500 kPa

gaseous phase

b)) the phase of CO2 at T = -80C and P = 120 kPa

gaseous phase

c) p=5707 kpa