Verfahren zur Herstellung von 1,2-Propandiol, Dipropylenglykol und Tripropylenglykol

Details

Veröffentlichungs-Nr.

EP3988532

Aktenzeichen

EP20203049

Anmeldetag

21. Oktober 2020

Veröffentlichung

21. September 2022

Erteilung

21. September 2022

Rechtsraum

EP

IPC

C07C29/48C07C29/88C07C29/80C07C31/20C07C41/05C07C41/44C07C41/42C07C43/11

Abstract

The method for preparing 1,2-propanediol, dipropylene glycol and tripropylene glycol comprises step a) of reacting propene with hydrogen peroxide containing nitrate in the presence of a catalyst mixture comprising a phase transfer catalyst and a heteropolytungstate in a liquid reaction mixture comprising an aqueous phase with a maximum apparent pH of 6 and an organic phase; step b) of separating the reaction mixture into an aqueous phase comprising 1,2-propanediol, dipropylene glycol, tripropylene glycol and nitrate and an organic phase; step c) of recycling at least part of the separated organic phase to the reaction step a); step d) of hydrogenating the separated aqueous phase using a heterogeneous hydrogenation catalyst to provide a hydrogenated aqueous phase with a reduced nitrate content; and step e) of recovering 1,2-propanediol, dipropylene glycol and tripropylene glycol from the hydrogenated aqueous phase by a sequential multiple step distillation.

Anmelder

Firma

Evonik Operations GmbH

Land

🇩🇪 Deutschland

Fachgebiete