Patent · US Active

Method for producing double metal cyanide catalysts

US11813595B2 · kind B2 · utility

0Cited by

14References

13Claims

0Family size

Assignee

Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

Joerg Hofmann · Krefeld, DE
Maria Gleixner · Kempen, DE
Thomas Asma · Tönisvorst, DE

Key dates

Filing date	Aug 6, 2019
Grant date	Nov 14, 2023
Priority date	—
Expiry date	Nov 7, 2040

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2208/00539
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a process for preparing a double metal cyanide catalyst (DMC) comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand and a complex-forming component, to form a dispersion, wherein the reaction is effected using a mixing nozzle and wherein the process temperature of the dispersion during the reaction is between 26° C. and 49° C. The subject matter of the invention further encompasses double metal cyanide catalysts (DMC) obtained in accordance with the process according to the invention and also the use of the DMC catalysts for the preparation of polyoxyalkylene polyols.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.