EP0333084A2
Expired / Lapsed
EP
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Method for preparing gaseous fluorides
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1989-03-11
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Granted: —
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Expires: 2009-03-11
Abstract
Abstract The method for preparing a gaseous metallic fluoride is here disclosed which comprises reacting a metal or its oxide with a fluorine gas or nitrogen trifluoride gas, the aforesaid method being characterized by comprising the steps of mixing the metal or its oxide with a molding auxiliary comprising a solid metallic fluoride which does not react with fluorine and nitrogen trifluoride; molding the resulting mixture under pressure; and contacting the molded pieces with the fluorine gas or nitrogen trifluoride gas, while the molded pieces are heated.
Inventors
- 👤 Isao Mr. Harada
- 👤 Yukihiro Mr. Yoda
- 👤 Naruyuki Mr. Iwanaga
- 👤 Toshihiko Mr. Nishitsuji
- 👤 Akio Mr. Kikkawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 22:00
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/45; C01B17/4507; C01B17/4515; C01B17/453; C01B25/00; C01B25/10; C01B33/00; C01B33/08; C01B33/107; C01B33/10705; C01B35/00; C01B35/06; C01B35/061; C01B9/00; C01B9/08; C01G; C01G41/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
81 words
A method for preparing a gaseous metallic fluoride by reacting a metal or its oxide with a fluorine gas or nitrogen trifluoride gas, said method being characterized by comprising the steps of mixing said metal or its oxide with a molding auxiliary comprising a solid metallic fluoride which does not react with fluorine and nitrogen trifluoride; molding the resulting mixture under pressure; and contacting the molded pieces with said fluorine gas or nitrogen trifluoride gas, while said molded pieces are heated.
Claim 2
Independent Claim
81 words
A method for preparing a gaseous metallic fluoride by reacting a metal or its oxide with a fluorine gas or nitrogen trifluoride gas, said method being characterized by comprising the steps of mixing said metal or its oxide with a molding auxiliary comprising a solid metallic fluoride which does not react with fluorine and nitrogen trifluoride; molding the resulting mixture under pressure; and contacting the molded pieces with said fluorine gas or nitrogen trifluoride gas, while said molded pieces are heated.
Claim 3
Dependent Claim
60 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said gaseous metallic fluoride is represented by MFm in which M is at least one metal selected from the group consisting of metals in the groups IIIA, IIIB, IVA, IVB, VA, VB,VIA and VIB of the periodic table, and m is an integer of 3 to 6.
Claim 4
Dependent Claim
71 words
A method for preparing a gaseous metallic fluoride according to Claim 2 wherein said gaseous metallic fluoride is at least one compound selected from the group consisting of tungsten hexafluoride (WF₆), molybdenum hexafluoride (MoF₆), antimony trifluoride (SbF₃), antimony pentafluoride (SbF₅), niobium pentafluoride (NbF₅), arsenic trifluoride (AsF₃), phosphorus trifluoride (PF₃), boron trifluoride (BF₃), tantalum pentafluoride (TaF₅), titanium tetrafluoride (TiF₄), silicon tetrafluoride (SiF₄), germanium tetrafluoride (GeF₄), sulfur hexafluoride (SF₆) and uranium hexafluoride (UF₆).
Claim 5
Dependent Claim
51 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said solid metallic fluoride which does not react with fluorine and nitrogen trifluoride is at least one compound selected from the group consisting of fluorides of metals in the groups IA, IIA and IIIB of the periodic table.
Claim 6
Dependent Claim
84 words
A method for preparing a gaseous metallic fluoride according to Claim 4 wherein said solid metallic fluoride which does not react with fluorine and nitrogen trifluoride is at least one compound selected from the group consisting of lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), rubidium fluoride (RbF), cesium fluoride (CsF), beryllium fluoride (BeF₂), magnesium fluoride (MgF₂), calcium fluoride (CaF₂), strontium fluoride (SrF₂), barium fluoride (BaF₂), aluminum fluoride (AlF₃), gallium fluoride (GaF₃), indium fluoride (InF₃), thallium fluoride (TlF₃) and aluminum sodium fluoride (Na₃AlF₆).
Claim 7
Dependent Claim
38 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said metal is at least one selected from metals in the groups IIIA, IIIB, IVA, IVB, VA, VB, VIA and VIB of the periodic table.
Claim 8
Dependent Claim
52 words
A method for preparing a gaseous metallic fluoride according to Claim 6 wherein said metal is at least one selected from the group consisting of tungsten (W), molybdenum (Mo), antimony (Sb), niobium (Nb), arsenic (As), phosphorus (P), boron (B), tantalum (Ta), titanium (Ti), silicon (Si), germanium (Ge), sulfur (S) and uranium (U).
Claim 9
Dependent Claim
57 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said metal oxide is at least one selected from the group consisting of tungsten oxide (WO₃), molybdenum oxide (MoO₃), uranium oxide (UO, UO₂ and U₃O₈), arsenic oxide (As₂O₅), antimony oxide (Sb₂O₅), niobium oxide (Nb₂O₅), tantalum oxide (Ta₂O₅), titanium oxide (TiO₂) and germanium oxide (GeO₂).
Claim 10
Dependent Claim
48 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein the amount of said metal or its oxide in the mixture is in the range of 30 to 70% by weight based on said mixture of said metal or its oxide and said molding auxiliary.
Claim 11
Dependent Claim
35 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said mixture of said metal or its oxide and said molding auxiliary is molded under a pressure of 0.5 to 10 t/cm².
Claim 12
Dependent Claim
31 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said molded pieces have a shape of a cylinder, ring, cubic sphere, gear wheel shape or ribed shape.
Claim 13
Dependent Claim
35 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said reaction of said molded pieces with said fluorine gas or nitrogen trifuluoride is performed at a temperature of 150 to 700°C.
Claim 14
Dependent Claim
36 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said reaction of said molded pieces with said fluorine gas or nitrogen trifuluoride is performed under a pressure of 1 to 10 kg/cm².
Claim 15
Dependent Claim
36 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said reaction of said molded pieces with said fluorine gas or nitrogen trifuluoride is performed for a period of 1 to 20 hours.
Claim 16
Dependent Claim
40 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein when the molded pieces are brought into contact with said fluorine gas or nitrogen trifluoride gas, said molded pieces are present in the form of filler layer.
Claim 17
Dependent Claim
38 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein after thermally treated in a reducing gas atmosphere, said molded pieces are brought into contact with said fluorine gas or nitrogen trifluoride gas under heating.
Claim 18
Dependent Claim
30 words
A method for preparing a gaseous metallic fluoride according to Claim 1 wherein said heating treatment in said reducing gas atmosphere is performed at a temperature of 500 to 850°C.
Claim 19
Dependent Claim
61 words
A method for preparing a gaseous metallic fluoride according to Claim 16 wherein said heating treatment in said reducing gas atmosphere is performed for a period of 1 to 100 hours in the case that the raw material is said metal, or for a period of 2 to 500 hours in the case that the raw material is said metallic oxide.
References Cited (Backward Citations)
No citation records indexed.
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