Processes of Producing Potassium Fluoroaluminates
Europaisches Patentamt European Patent Office Office europeen des brevets © Publication number : 0 597 652 A1 EUROPEAN PATENT APPLICATION (2j) Application number : 93308900.5 © int. ci.5: C01F 7/54, B23K 35/363 (22) Date of filing : 08.11.93 © Priority: 09.11.92 US 973721 Inventor : Kumar, Sampath H. 11323 E. 23th Street Apt. 18-8 Tulsa, Oklahoma 74129 (US) @ Date of publication of application : Inventor : Bhagat, Sudhir S. 18.05.94 Bulletin 94/20 8810 South Delaware, Apt. 5 Tulsa, Oklahoma 74137 (US) Inventor : Contractor, Dinshaw B. @ Designated Contracting States : 8910 E. Marshall Place BE DE FR GB Tulsa, Oklahoma 74115 (US) Inventor : Meshri, Sanjay 2621 E. 46th Street © Applicant : ADVANCE RESEARCH Tulsa, Oklahoma 74105 (US) CHEMICALS, INC. 1085 Fort Gibson Road Catoosa, OK 74015 (US) (74) Representative : Mock, Hans et al MARKS & CLERK, Suite 301, Sunlight House, Quay Street (72) Inventor : Meshri, Dayal T. Manchester M3 3JY (GB) 2621 E. 46th Street Tulsa, Oklahoma 74105 (US) © Processes of producing potassium fluoroaluminates. (57) Potassium tetrafluoroaluminate and potassium hexafluoroaluminate have been produced by three new processes : (a) by reacting alumina trihydrate with freshly produced, hot, solvated potassium fluoride solution in presence of stoichiometric amounts and/or an excess of hydrogen fluoride, or (b) by reacting aluminum trifluoride trihydrate with hot aqueous solution of potassium fluoride or potassium bifluoride, or (c) by generating in situ potassium aluminate by reacting alumina trihydrate with hot aqueous potassium hydroxide and treating the same with aqueous or anhydrous hydrogen fluoride. CM If) CO h- o> If) LU Jouve, 18, rue Saint-Denis, 75001 PARIS EP 0 597 652 A1 BACKGROUND OF THE INVENTION FIELD OF THE INVENTION: 5 The present invention relates to several si mple, energy efficient and advantageous processes of producing potassium tetrafluoroaluminate, potassium hexafluoroaluminate and their mixtures.
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