Patent ID: 7083773
Filing Date: 2006-08-01
Classification: C01B,C01C

Abstract:
1. A method for producing nitrogen trifluoride by contacting a fused ammonium fluoride salt with a fluorine gas comprising: forming a stream of micro droplets of the fused ammonium fluoride salt by a rapid ejection of the fused ammonium fluoride salt in a reactor through a jet ejector pipe having nozzles, each of said nozzles having a nozzle cross-sectional area and a throat having a throat cross sectional area, wherein said throat cross sectional area to said nozzle cross sectional area is, a ratio selected from the group consisting of 5, 25, 5 through 25, and any combinations thereof, and wherein said fused ammonium fluoride salt at said nozzles has an ejecting linear velocity of about 2 meters/second to about 30 meters/second; circulating the fused ammonium fluoride salt from a lower portion to an upper portion of said reactor; contacting within said stream of micro droplets the fused ammonium fluoride salt with the fluorine gas, the fluorine gas being sucked in said reactor through a suction pipe for fluorine gas by a negative pressure, said negative pressure being formed around said nozzle due to said rapid ejection of the fused ammonium fluoride salt; and transferring a portion of the fused ammonium fluoride salt in said reactor to a second jet-loop reactor, said portion being rapidly ejected in said second jet-loop reactor through a second nozzle, said portion being circulated from a lower portion to an upper portion of said second jet-loop reactor, a stream of micro droplets of said portion being contacted with ammonia gas, said ammonia gas being sucked in said second jet-loop reactor by a negative pressure being formed around said second nozzle due to an ejection of the fused ammonium fluoride salt, wherein said portion and said ammonia gas continuously produce nitrogen trifluoride, continuously reproduce the fused ammonium fluoride salt and recycle the fused ammonium fluoride salt reproduced in said second jet-loop reactor for nitrogen trifluoride production.