Heterogeneous catalysts for the synthesis of carbamates

US11406964B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Stefan Wershofen · Mönchengladbach, DE
• Anton Vidal-Ferran · Cologne, DE
• José Luis Núñez Rico · Montbrió del Camp, ES
• Javier Perez-Ramirez · Zürich, CH
• Begona Puertolas Lacambra · Zürich, CH
• Amol P. Amrute · Lund, SE

Key dates

• Filing date: Mar 26, 2019
• Grant date: Aug 9, 2022
• Expiry date: Jun 27, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C271/28
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a catalyst for preparing carbamates, in particular aromatic carbamates, comprising a binary oxide having the formula L1-xMxO2, wherein L is a metal selected from the lanthanoid series and M is a metal selected from the group consisting of Sc, Y, Ti, Zr, Hf, metals from the lanthanoid series and metals from the actinoid series, and wherein x ranges from 0.01 to 0.05. The present invention also relates to a method for producing said catalysts and a method of utilizing said catalysts in the production of carbamates, in particular aromatic carbamates.