Patent · US Expired

Purifying hydrofluoric acid

US4150102A · kind A · utility

4Cited by

3References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Werner Schabacher · Leverkusen, DE
Bernhard Spreckelmeyer · Johannesburg, ZA

Key dates

Filing date	Jan 27, 1978
Grant date	Apr 17, 1979
Priority date	—
Expiry date	Jan 27, 1998

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D53/1456
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H.sub.2 O, SO.sub.2, SiF.sub.4, S,CaF.sub.2, H.sub.2 SO.sub.4 and CaSO.sub.4 and obtained in the reaction of fluorite and sulphuric acid, whereby the resultant HF has an H.sub.2 SO.sub.4 content of the order of a few ppm, there are substantially no deposits of CaSO.sub.4 in the first H.sub.2 SO.sub.4 washing circuit and the service life of the system is considerably lengthened.

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