The effect of presence of silver nanoparticles in pure

N

-methyl-2-pyrrolidone (NMP) solvent for ethylene gas absorption in an experimental pressure decaying setup has been investigated. All experiments were performed at temperatures of 278.15 K

298.15 K and 328.15 K and different pressures (up to ethylene dew point) as well as different concentrations of silver nanoparticles (0.05 g·L

-1

and 0.1 g·L

-1

). The kinetic data of absorption

Henry's law constants

and heat of absorption were calculated. Comparison of the pure solvent and the nanofluids absorption results revealed that the presence of small amounts of nanoparticles could improve the absorption performance between 1.5%-18%. Finally

the effect of temperature

pressure

and nanoparticle concentration on the equilibrium results were investigated.