Separation and Purification Technology, Volume 116, 15 September 2013,
Pages 342–350
Separation of ethylene from refinery dry gas via
forming hydrate in w/o dispersion system
Huang Liu, Liang Mu, Bo Wang, Bei Liu, Jin Wang,
Xiaoxin Zhang, Changyu Sun, Jun Chen, Menglei Jia, Guangjin Chen
State Key Laboratory of Heavy Oil Processing, China University of Petroleum,
Beijing 102249, PR China
Abstract
Reports on an absorption–hydration hybrid method used to recover ethylene
from refinery dry gas using water in diesel emulsion under hydrate formation
conditions. Researchers employed Span 20 to disperse water or hydrate in
diesel.
They synthesized two (CH4 + C2H4
+ N2 + H2) quaternary feed gas mixtures to simulate a
two-stage separation of refinery dry gases. They studied the influence of
temperature, pressure, feed gas composition, initial gas–liquid volume ratio, and initial water cut in
liquid on the separation efficiency. They defined a pseudo separation factor (S) examine the separation selectivity of ethylene over
other components. Results reveal that ethylene can be enriched in hydrate
slurry phase with high selectivity and high recovery ratio.
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