Oligomerization of Ethylene in Fluidized Catalytic Cracking (FCC) Dry Gas to Propylene

Advanced Materials Research (Volumes 524 - 527), Pages 1835-1838 (2012)
Oligomerization of Ethylene in Fluidized Catalytic Cracking (FCC) Dry Gas to Propylene
Xue Ding, Chun Yi Li, Chao He Yang
Abstract
Researchers studied oligomerization of ethylene in fluidized catalytic cracking (FCC) dry gas to propylene as a feasible approach to use FCC dry gas.  The thermodynamic calculation indicated that the equilibrium conversion of ethylene decreased with an increasing temperature.  The experimental conversion achieved peak value at nearly 500°C due to kinetic limit.
They studied the catalytic performances of HZSM-5 catalysts with FCC dry gas as feedstock in a fixed-bed reactor. They confirmed that oligomerization carried out at a higher temperature using dilute feed or a less active catalyst such as steam treated catalyst favored propylene yield.
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Journal of Industrial and Engineering Chemistry, Volume 18, Issue 5, 25 September 2012, Pages 1836–1840
Effect of Mn doped-titania on the activity of metallocene catalyst by in situ ethylene polymerization
S.H. Abdul Kaleel a, Bijal Kottukkal Bahuleyan a, S.K. De a, Masihullah Jabarulla Khan a, Rachid Sougrat b, Mamdouh A. Al-Harthi a, c,
a Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia
b King Abdullah University of Science and Technology, 23955-6900 Thuwal, Saudi Arabia
c Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia
Abstract
Using highly active metallocene catalysts (Cp2ZrCl2 and Cp2TiCl2) in combination with methylalumoxane, researchers conducted ethylene polymerization.  They employed titanium(IV) oxide containing 1% Mn as dopant as nanofillers.  They studied the influence of filler concentration, reaction temperature and pressure on the catalytic activity and polymer properties.
They observed a fourfold increase in the activity of zirconocene catalyst by addition of doped-titania. The morphology indicates that the doped-titania nanoparticles have a nucleus effect on the polymerization and caused a homogeneous PE shell around them.
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