Process for isolating tetraphenylborates

US5693867A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Rudiger Baur · Eppstein, DE
• Hermann Fuchs
• Hans-Tobias Macholdt · Darmstadt, DE
• Jorg Gitzel · Hattersheim, DE
• Wilfried Theiss · Flörsheim, DE

Key dates

• Filing date: Aug 29, 1996
• Grant date: Dec 2, 1997
• Expiry date: Aug 29, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F5/027
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Tetraphenylborates are obtained in an industrially advantageous grade by spray drying an organic, aqueous or organic-aqueous extract of the tetraphenylborates obtainable in the tetraphenylborates synthesis. It is advantageous to treat the specified extract prior to spray drying with pH-controlling auxiliaries and adsorbents to remove byproducts or to limit their formation. The process gives tetraphenylborates in a homogeneous technical grade, i.e. in a narrow particle size distribution and in a particular particle shape, which improves the dispersibility in the medium to be used.