Ammonia recovery in the preparation of silazanes and...

Details Ammonia recovery in the preparation of silazanes and... Ammonia recovery in the preparation of silazanes and...

2006-04-25

2006-04-25

Silverman, Stanley S. (Department: 1754)

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

C423S356000, C423S470000, C423S471000, C423S499400, C423S499500

Reexamination Certificate

active

07033562

ABSTRACT:
Silazanes and/or polysilazanes are prepared by ammonolysis reaction in liquid anhydrous ammonia by introducing at least one halosilane into the ammonia. In addition to the silazane and/or polysilazane, an ammonolysis by-product also results. A substantially more efficient process is disclosed for treating the by-product through the addition of a liquid, namely water, or a solution comprising a strong base, or an aqueous acid solution. The process may be employed for more efficient, economical recovery of ammonia from such waste stream solutions of ammonia halide, or acids thereof for use as recycle in the further production of silazanes and polysilazanes, and/or for producing a less hazardous, more readily disposable salt residue thereof.

REFERENCES:
patent: 4713231 (1987-12-01), Campbell et al.
patent: 5196556 (1993-03-01), Vaahs et al.
patent: 5281318 (1994-01-01), Tahara
patent: 5746993 (1998-05-01), Mullee
patent: 6329487 (2001-12-01), Abel et al.
patent: 2002/0165319 (2002-11-01), Knasiak et al.

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