Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB27737/47A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howmet Aerospace Inc
Original Assignee
Aluminum Company of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aluminum Company of AmericafiledCriticalAluminum Company of America
Publication of GB647218ApublicationCriticalpatent/GB647218A/en
C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
C01B35/00—Boron; Compounds thereof
C01B35/06—Boron halogen compounds
C01B35/063—Tetrafluoboric acid; Salts thereof
C01B35/065—Tetrafluoboric acid
Landscapes
Chemical & Material Sciences
(AREA)
Organic Chemistry
(AREA)
Inorganic Chemistry
(AREA)
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals
(AREA)
Abstract
Hydrofluoboric acid is produced by decomposing calcium fluoride (fluorspar) with aqueous sulphuric acid and boric acid at 60 DEG C. up to boiling, removing insoluble material, chiefly calcium sulphate, and precipitating remaining sulphate ions with benzidine at 0 DEG C. to room temperature. Prior to the addition of benzidine, part of the sulphate may be precipitated by lime, 80 per cent say of the stoichiometric amount being used. The hydrofluoboric acid may be employed for the production of p aluminium fluoride as in Specification 647,217. Specification 647,216 also is referred to.
GB27737/47A1946-10-171947-10-16Improvements in or relating to the production of hydrofluoboric acid from calcium fluoride
ExpiredGB647218A
(en)