Manufacture of Polypropylene

Propylene monomer is produced by catalytic cracking of petroleum fractions or the steam cracking of hydrocarbons during the production of ethylene. Conventional processes in liquid phase and in slurry use stirred reactors and a diluent such as naphtha, hexane, or heptane. The reaction takes place typically at a temperature of about 60-80°C and at 0.5-1.5 MPa, and the final product is obtained as a solid suspension of polypropylene in the liquid phase. Isolation of the resin requires a separation step (such as centrifugation) followed by washing the resin free of residual diluent and drying.

The manufacturing process for polypropylene has undergone many changes since 1957 when the first facility went on stream. In the 1960s the Novolon gasphase process and the Phillips process for polymerizing liquid propylene were introduced. These processes had the advantage of not using any diluents, but they generally suffer from relatively poorer catalyst performance and some limitations

Table 2.6 Comparison of Low-Pressure Production Processes for Polypropylene

Company

Reaction Phase

Reactor

Solvent

Weight Distribution

Isotactic Index (%)

Montedison,

Liquid

Was this article helpful?

0 0
Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment