At present, polypropylene (PP) is mainly produced by gas phase and bulk processes, and the growth of global gas phase and bulk loop process resins strongly challenges the slurry process products. Since the 1990s, the slurry process is gradually being phased out. In the global PP production process, Basell's Spheripol loop/gas phase process dominates, currently accounting for 50% of global PP production; followed by DOW's Unipol gas phase process, BP's Innovene gas phase process, NTH's Novolen Gas phase process, Mitsui's Hypol kettle body process, Borealis' Borstar loop/gas phase process. In recent years, the proportion of gas phase and bulk processes has increased year by year, and PP plants under construction and new construction around the world will basically adopt gas phase processes and bulk processes. In particular, the rapid increase in gas phase processes is challenging the world's first Spheripol process. According to NTH, since 1997, 55% of the world's licensed PP new capacity has been using the Novolen gas phase process, and there will be a gradual increase in gas phase processes in the future. In addition to the above major PP production processes, the original Montel company successfully developed the reactor PP alloy Catalloy and Hivalloy technology in the 1990s. The successful development of these two technologies has created conditions for the high-performance, functionalization and high value-added applications of PP resins, and industrial production has now been realized.
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