Jean-Claude Detrait, Jacques F. Grootjans Fina Research SA Feluy, Belgium Propylene streams from the refinery fluid catalytic cracking unit and delayed coker contaminants that are poisons to polymerization catalysts. A new sorbent catalyst, called Prosorb, allows petrochemical producers to clean up these "dirty" propylene streams to a level adequate for use with the new high-yield polymerization catalysts. The process, called "Triple P" (propylene polishing process), eliminates all common contaminants, including COS, H2S, mercaptans, AsH3, and SbH3. Commercial trials have taken place at two Fina refineries and at a joint vent...

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