Method for preparing gaseous metallic fluoride
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsIsao Harada, Yukihiro Yoda, Naruyuki Iwanaga, Toshihiko Nishitsuji, Akio Kikkawa
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Abstract
The method for preparing a gaseous metallic floride 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.
Claims18
A method for preparing a gaseous metallic fluoride by reacting a metal or its oxide wit fluorine gas or nitrogen trifluoride gas, the process comprising the steps of mixing said metal or its oxide with a molding auxiliary compound comprising at least one compound selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, beryllium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, barium fluoride, aluminum fluoride, gallium fluoride, indium fluoride and aluminum sodium fluoride;
- molding the resulting mixture under pressure to form molded pieces;
- and contacting the molded pieces with said fluorine gas or nitrogen trifluoride gas while said molded pieces are heated to form said gaseous metallic fluoride.
A method of preparing a gaseous metallic fluoride comprising the steps of compacting a mixture of a metal or metal oxide with a solid metal fluoride under pressure to form a molded piece, wherein the metal fluoride is selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, beryllium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, barium fluoride, aluminum fluoride, gallium fluoride, indium fluoride, and aluminum sodium fluoride;
- heating the molded piece in an atmosphere containing fluorine gas or nitrogen trifluoride gas at a temperature and for sufficient time to produce a substantially pure metallic fluoride.
A method of preparing a gaseous metallic fluoride comprising the steps of;
- (a) compacting a mixture of a solid metallic fluoride and a metal or metal oxide under pressure to form a molded piece, wherein said solid metallic fluoride is selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, beryllium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, barium fluoride, aluminum fluoride, gallium fluoride, indium fluoride, thallium fluoride and aluminum sodium fluoride, and wherein the metal or metal oxide is a metal selected from the group consisting of groups IIIA, IIIB, IVA, IVB, VA, VB, VIA and VIB;
- (b) heating the molded piece in a reducing gas atmosphere;
- (c) heating the molded pieces in an atmosphere containing fluorine gas or nitrogen trifluoride gas at a temperature and for sufficient time whereby substantially pure metallic fluoride gas is produced.
Dependencies are inferred from the claim text.