Solubilities of CO 2 , O 2 and N 2 in rocket propellant 5 under low pressure

The static method of isochoric saturation was used to measure the solubilities of CO 2 , O 2 and N 2 in rocket propellant 5 (RP5) at temperatures ranging from 253.15 to 323.15 K in 10 K intervals and pressures ranging from 0 to 120 kPa. The measurement accuracy of the constructed experimental setup was verified by measuring the solubility of CO 2 in water. The relative expanded uncertainty ( k = 2) in the solubility data was less than 4.0%. The solubilities of CO 2 , O 2 and N 2 in RP5 increased with pressure. As the temperature increased, the solubility decreased for CO 2 solubility and increased for O 2 and N 2 . Henry's constants for the three gases in RP5 decreased over the experimental temperature and pressure ranges in the order of N 2 > O 2 > CO 2 . The measured solubilities of CO 2 , O 2 and N 2 could be fitted with a modified Krichevsky–Kasarnovsky equation, and the maximum deviation between the measured and calculated data was less than 8.04%, 7.03% and 6.18%, respectively.