Equilibrium gas solubility and volumetric mass transfer coefficient (kLa) of ethylene/n-hexane

propylene/n-hexane

ethylene/n-hexane/low molecular weight polyethylene (LMW HDPE) and propylene/n-hexane/ LMW HDPE systems were obtained in a Buchi autoclave

using the transient physical gas absorption technique

under the pressure from 0.2 MPa to 1.45 MPa

and the temperature from 343 K to 393 K.The apparent dissolution heat was obtained by regression.The PC-SAFT equation of state was used to correlate the gas-liquid equilibrium data

while an empirical correlation to predict the kLa values was proposed

and the model value matched the experimental results well.The effects of pressure

temperature and LMW HDPE concentration on gas solubility and kLa were investigated.The results showed that the gas solubilities obeyed the Henry’s law

while it decreased with increasing temperature and LMW HDPE concentration.The kLa values were found to drop slightly with increasing pressure and decrease dramatically with increasing LMW HDPE concentration.Particularly

kLa increased for ethylene/n-hexane and decreased for propylene/n-hexane with increasing temperature.