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.