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:
Nov. 04, 2003
Filed:
Dec. 08, 1998
Applicant:
Inventors:
Jean-Paul Chalieux, Irigny, FR;
Christian Pralus, Saint Cyr au Mont d'Or, FR;
Assignee:
Elf Atochem, Puteaux, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 3/506 ; C01B 1/774 ; C01B 1/790 ;
U.S. Cl.
CPC ...
C01B 3/506 ; C01B 1/774 ; C01B 1/790 ;
Abstract
The invention relates to the preparation of BF and H SO of commercial grade from boron trifluoride hydrate effluents containing organic impurities. The process consists essentially in reacting the said effluent with oleum, in recovering the gaseous boron trifluoride thereby liberated and in subjecting the sulphuric acid by-product to treatment with hydrogen peroxide and to purging with air.