The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 1979
Filed:
Jan. 27, 1978
Applicant:
Inventors:
Werner Schabacher, Leverkusen, DE;
Bernhard Spreckelmeyer, Johannesburg, ZA;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423485 ; 423488 ;
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.