Polypropylene is a non-toxic, odorless, tasteless milky white high-crystallization polymer. It is one of the lightest varieties of all plastics at present. It has good formability, good surface gloss, heat resistance and corrosion resistance. The product can be sterilized by steam. The outstanding advantages of polypropylene.
The main raw material of polypropylene is propylene, which is mainly produced from naphtha, methanol and propane.
The price of propylene is not only affected by the prices of crude oil, methanol and propane, but also by the relationship between supply and demand in the market.
This kind of chemical raw material, which is widely used in plastic weaving, packaging, automobiles, medical treatment, optical fiber cables and other fields, will have new requirements in the development and upgrading of new industries.
With the continuous development of my country's economy, the plastic processing industry presents new demand trends of "functionalization", "lightweight" and "micro-molding", which drives the stability of demand for polypropylene products such as thin-wall injection molding, high-impact copolymerization, and fiber increase.
Polypropylene (PP) Industrial Route
At present, according to the different reaction medium and reactor configuration, there are three main types of polypropylene production processes: slurry process, bulk process, and gas phase process.
Slurry method: propylene is dissolved in an inert hydrocarbon diluent (such as butane, pentane, hexane, heptane or nonane) for polymerization. Typical processes mainly include Italy’s Montedison process, American Hercules process, and Japan’s Mitsui Chemicals process , Amoco process in the United States, Mitsui oil and chemical process in Japan, and Sowell process, etc.;
Bulk method: It is to make liquid propylene polymerize. This process does not add any other solvents to the reaction system. The catalyst is directly dispersed in liquid phase propylene to carry out liquid phase bulk polymerization of propylene. Typical processes include the Spheripol process of Basel Corporation , the Hypol process of Mitsui Chemicals, the Borstar process of Borealis, etc.;
Gas-phase method: Direct gas-phase polymerization of propylene to produce solid-phase polymer products. Typical processes include DOW’s Unipol process, CB&I (formerly ABB) Novolen process, INEOS (BP) Innovene process, Lyondell-Basell’s Spherizone process, etc.