Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Molecular oxygen or ozone component
Reexamination Certificate
2006-03-14
2006-03-14
Langel, Wayne A. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Molecular oxygen or ozone component
C423S352000
Reexamination Certificate
active
07011799
ABSTRACT:
A method for removing oxygen from ammonia at low temperature is described. In one embodiment, oxygen contaminated ammonia is contacted with a getter material that includes iron and manganese that sorbs oxygen to yield ammonia that is substantially oxygen free. In one embodiment, the process of contacting ammonia with the getter material takes place at about 25° C. In another embodiment the weight ratio between iron and manganese is about 7:1. In another embodiment, the getter material is dispersed on an inert support of specific surface greater than 100 m2/g. In one embodiment, impure ammonia is contacted with getter material including iron and manganese that sorbs oxygen and with a drying agent that absorbs water to yield deoxygenated anhydrous ammonia. In yet another embodiment, an apparatus consisting of a gas inlet, gas purification chamber and gas outlet that deoxygenates ammonia when charged with getter material that includes iron and manganese is described. In one embodiment, getter material and drying agent are mixed together inside the gas purification chamber. In another aspect a method for producing semiconductor devices with high purity ammonia is described.
REFERENCES:
patent: 3852406 (1974-12-01), Krauss
patent: 4075306 (1978-02-01), Muromura
patent: 4586561 (1986-05-01), Franco et al.
patent: 4839085 (1989-06-01), Sandrock et al.
patent: 5145657 (1992-09-01), Kobayashi et al.
patent: 5213767 (1993-05-01), Smith et al.
patent: 5284629 (1994-02-01), Henderson et al.
patent: 5536302 (1996-07-01), Golden et al.
patent: 5669961 (1997-09-01), Baker et al.
patent: 5716588 (1998-02-01), Vergani et al.
patent: 0240270 (1987-07-01), None
patent: 0365490 (1993-10-01), None
patent: 0484301 (1994-10-01), None
patent: 2509600 (1981-02-01), None
patent: 60166206 (1984-02-01), None
patent: 2-651611 (1988-11-01), None
patent: 335992832 (1991-11-01), None
patent: WO 94/25395 (1994-10-01), None
U.S. Appl. No. 10/284,423, filed Oct. 31, 2001, Watanabe et al.
N-150 Gas Purification Catalyst, Nissan Girdler Catalyst Co., Ltd., Jan. 1990 pp. 1-5.
Solcia Carolina
Succi Marco
Vergani Giorgio
Langel Wayne A.
Perkins Coie LLP
SAES Getters S.p.A.
LandOfFree
Method for deoxygenating ammonia with reduced oxides of iron... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for deoxygenating ammonia with reduced oxides of iron..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for deoxygenating ammonia with reduced oxides of iron... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3591095