Mitsui hypol process

The other competing bulk propylene processes include the Mitsui Hypol process and the various offshoots of the El Paso (or Rexene) process. In 2005, ExxonMobil announced that they were licensing a propylene bulk process based on the loop reactor. The front end of the ExxonMobil process is similar to the Spheripol process with a single or double loop, but a fluidized-bed gas-phase reactor is used for impact copolymer instead of the stirred-bed gas-phase reactor in a typical Spheripol process. 

The Mitsui Hypol process is based on two stirred autoclave reactors followed by two fluidized-bed gas-phase reactors (Figure 2.41). The gas-phase reactors are also used in homopolymerization, enabling polymer with better properties to be made. In the more up-to-date Hypol II process, the stirred autoclaves are replaced by loop reactors giving higher throughput and further reducing capital costs. 

Third-generation high yield supported catalysts are also used in processes in which Hquid monomer is polymerized in continuous stirred tank reactors. The Hypol process (Mitsui Petrochemical), utilizes the same supported catalyst technology as the Spheripol process (133). Rexene has converted the hquid monomer process to the newer high yield catalysts. Shell uses its high yield (SHAC) catalysts to produce homopolymers and random copolymers in the Lippshac process (130). 

Up to now, about twenty PP plants in Asia and America have been built with Mitsui s Hypol process. 

Liquid monomer is polymerized in continuous stirred tank reactors in a number of processes. The Hypol process, developed by Mitsui Petrochemical, uses a cascaded series of stirred reactors for homopolymerization, followed by fluidized bed gas-phase reactors for copolymerization (274). El Paso (now Himtsman) converted the Rexall liquid monomer process to use high yield catalysts eliminating the sections required for deashing and removal of atactic material (275). Shell (now Basell) developed the LIPP process to produce homopolymers and random copolymers, using their high yield catalysts. 

Hypol [Hyosung polypropylene] Also called Hypol 11 and Mitsui Hypol. A process for making polypropylene, generally similar to Spheripol. Developed by Mitsui Petrochemical Company, Japan, and Hyosung... 

Hypol A process for making polypropylene, generally similar to Spheripol. Developed by Mitsui Petrochemical Company, Japan. 

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