Process for producing hydrogen fluoride from fluorine containing materials by continuous pyrohydrolysis

US4294816A · kind A · utility

Assignee

• Vereinigte Aluminum - Werke Aktiengesellschaft · DE

Inventors

• Jorg Kruger · Krefeld, DE
• Roland Thome · Bonn, DE
• Dieter Moritz · Grafenau, DE
• Hubert Bings · Grafenau, DE
• Herbert Losert · Grafenau, DE

Key dates

• Filing date: Oct 17, 1980
• Grant date: Oct 13, 1981
• Expiry date: Oct 17, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for extracting hydrogen fluoride from fluorine containing materials includes countercurrently contacting the materials with steam having a plane of rotation relatively perpendicular to the direction of flow of the material. An apparatus for the extraction of hydrogen fluoride from fluorine containing materials includes a rotary kiln having a first zone wherein a steam-air mixture countercurrently contacts the materials in an oxidation step, a second zone wherein an oxygen containing gas is tangentially injected into the kiln to provide complete combustion of carbon containing materials, a third zone wherein a steam stream countercurrently contacts the materials in a reducing step and means for providing a plane of rotation to the steam which is relatively perpendicular to the direction of flow of the material.