Method for depolymerizing polymethylmethacrylate

US6469203B1 · kind B1 · utility

Assignees

• Metallgesellschaft AG · DE
• Rohm GmbH Chemische Fabrik · DE

Inventors

• Hans-Jurgen Weiss · Oberursel, DE
• Jorg Schmalfeld · Friedrichsdorf, DE
• Udo Zentner · Griesheim, DE
• Tobias Groschang · Hanau, DE
• Udo Gropp · Bad Endorf, DE
• Werner Fuss · Karlstein, DE
• Ralf Goedecke · Rodenbach, DE
• Egbert Schola · Eisenstadt, AT

Key dates

• Filing date: Jun 21, 2001
• Grant date: Oct 22, 2002
• Expiry date: Jun 21, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/333
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process of recovering monomeric esters of substituted or unsubstituted acrylic acid from polymer material having corresponding structural units by depolymerization by means of a fine-grained heat-transfer medium which is maintained above the depolymerization temperature of the polymer material. In a reactor, the polymer material is brought in contact with hot, mechanically fluidized heat-transfer medium. The resulting vapors are withdrawn and condensed, where the hot heat-transfer medium is continuously supplied at one end of the reactor, and cooled heat-transfer medium is discharged at the other end.