Process for the preparation of sodium fluoride

US6106794A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Lailach · Krefeld, DE
• Andreas Bulan · Langenfeld, DE
• Gunter Buss · Leverkusen, DE

Key dates

• Filing date: Jul 30, 1999
• Grant date: Aug 22, 2000
• Expiry date: Jul 30, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01D3/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Process for the preparation of sodium fluoride from sodium hydroxide solution and hydrogen fluoride, characterized in that at least 45% strength by weight, in particular 50% strength by weight, sodium hydroxide solution and anhydrous hydrogen fluoride are introduced separately into a saturated NaF solution in which 4 to 50% by weight, preferably 5 to 30% by weight, solid NaF are suspended and the temperature of which is in the range from 20 to 80.degree. C., preferably 30 to 60.degree. C.