Part II - Chromium-Based Catalysts Developed by Union Carbide

2 Part II - Chromium-Based Catalysts Developed by Union Carbide 

In the 1960s, scientists at the Union Carbide Corporation developed two additional silica-supported, chromium-based catalysts that are used in a gas-phase process for the manufacture of HDPE. One catalyst is based on 

Bis(triphenylsilyl)chromate, [(CgHj)3SiO]2CrO and an aluminum alkyl and the other catalyst is based on chromocene, CrlCjHj). These two Cr-based catalysts, in addition to a Phillips-type catalyst, were used in the 1960s to commercialize the gas-phase process for the manufacture of various grades of HDPE. This process was licensed by Union Carbide around the world under the trade name UNIPOL Process. 

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