The effect of silver nitrate on the solubility of propane and propylene gases in NMP

To increase the absorption capacity of olefins in an absorbent for olefin/paraffin separation process, different ionic salts are used to react with olefin while they aren’t able to react with the paraffin. In this study, large numbers of experiments were performed to measure the equilibrium solubility of propane and propylene in N-methyl pyrrolidone (NMP) containing silver nitrate (AgNO3) salt. The experiments performed at different temperatures of 276, 293 and 328 K, different pressures up to 8.3 bar, and different salt concentrations of 5 and 10 gr/lit. . increasing of salt concentration and solubility of propylene is greater than propane. The results indicate that in the same operating conditions, solubility of propylene in NMP containing silver nitrate salt is greater compared with the solubility of propane. Therefore, NMP containing silver nitrate salt can be an appropriated solvent for separating propylene from propane.

Keywords:

solubility of gas , propane , propylene , N-methyl pyrrolidone , silver nitrate salt