C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
C01C 1/00 (2006.01) C01C 1/02 (2006.01) C01C 1/16 (2006.01) C07F 7/10 (2006.01)
Patent
CA 2502518
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.
Selon l'invention, des silazanes et/ou des polysilazanes sont préparés par réaction d'ammoniolyse dans de l'ammoniaque anhydreux liquide par introduction d'au moins un halosilane dans l'ammoniaque. En plus du silazane et/ou du polysilazane, un sous-produit d'ammoniolise est également obtenu. L'invention concerne un procédé sensiblement plus efficace de traitement du sous-produit par l'addition d'un liquide, à savoir, de l'eau, ou une solution comprenant une base forte, ou une solution acide aqueuse. Ledit procédé peut être employé pour la récupération plus efficace et plus économique d'ammoniaque à partir desdites solutions de flux de déchets d'halogénure d'ammonium, ou d'acides destinés à être utilisés en tant que matière de recyclage pour la production ultérieure de silazanes et de polysilazanes, et/ou pour produire un résidu de sel moins dangereux, plus facilement jetable.
Blake Cassels & Graydon Llp
Clariant Finance (bvi) Limited
Kion Corporation
LandOfFree
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