Process for preparing two-metal cyanide catalysts

US6303533A · kind A · utility

Assignee

• BASF SE

Inventors

• Georg Heinrich Grosch · Bad Dürkheim, DE
• Harald Larbig · Ludwigshafen, DE
• Dieter Junge · Bischofswerda, DE
• Daniella Geelen · Schöten, DE
• Peter de Vocht · Ranst, BE
• Gerd Hoeppner · Schwarzheide, DE

Key dates

• Filing date: Mar 5, 1998
• Grant date: Oct 16, 2001
• Expiry date: Mar 5, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing double metal cyanide catalysts, comprising combining an aqueous solution of a metal salt of the formula M.sup.1.sub.m (X).sub.n, with an aqueous solution of a cyanometallic acid of the formula H.sub.a M.sup.2 (CN).sub.b (A).sub.c, where one or both aqueous solutions may comprises at least one water-miscible organic ligand selected from the group consisting of alcohols, aldehydes, ketones, ethers, polyethers, esters, ureas, amides, nitrites or sulfides, if desired, combining the aqueous suspension thus obtained with at least one water-miscible organic ligand selected from the above-mentioned group, which ligand may be identical to or different from any previously added ligand, and separating the resulting two-metal cyanide complex from the suspension.