关键词:

乙烯, 丙烯, 正己烷, 低聚物, 气体平衡溶解度, 液相体积传质系数

Abstract:

Equilibrium gas solubility and volumetric mass transfer coefficient (k_La) 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 k_La 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 k_La 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 k_La values were found to drop slightly with increasing pressure and decrease dramatically with increasing LMW HDPE concentration.Particularly, k_La increased for ethylene/n-hexane and decreased for propylene/n-hexane with increasing temperature.

Key words:

乙烯, 丙烯, 正己烷, 低聚物, 气体平衡溶解度, 液相体积传质系数