Catalyst systems for polycondensation reactions

US6828272B2 · kind B2 · utility

Assignee

• Equipolymers GmbH · DE

Inventors

• Jens-Peter Wiegner · Bodenwerder, DE
• Rolf Eckert · Rutesheim, DE
• Volkmar Voerckel · Merseburg, DE
• Gunter Feix · Bodenwerder, DE
• Marion Sela · Bodenwerder, DE
• Sarat Munjal · Freeport, US

Key dates

• Filing date: Oct 25, 2002
• Grant date: Dec 7, 2004
• Expiry date: Oct 25, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J23/06
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention pertains to new catalyst systems for polycondensation reactions, for example for producing polyethylene terephthalate. In accordance with the invention, complex compounds with hydrotalcite-analogous structures of general formula [M(II)1−xM(III)x(OH)2]x+(An−x/n).mH2O are used, wherein M(II) represents divalent metals, preferably Mg or Zn or NI or Cu or Fe(II) or Co, and M(III) represents trivalent metals, for example Al or Fe(III), and A represents anions, preferably carbonates or borates. These catalysts can be calcinated and can be used in combination with phosphorus compounds that contain at least one hydrolyzable phosphorus-oxygen bond.