C - Chemistry – Metallurgy – 06 – B
Patent
C - Chemistry, Metallurgy
06
B
C06B 35/00 (2006.01) C06B 21/00 (2006.01) C06D 5/06 (2006.01)
Patent
CA 2042754
-1- ABSTRACT OF THE DISCLOSURE Multiple processes and apparatuses are described for improving the prior system of making gas generant pellets or tablets made of sodium azide, molybdenum disulfide and sulfur wherein powdered ingredients thereof are slurried in water, subjected to wet grinding, spray dried to a powdered materialwhich is molded into pellets or tablets which find use in vehicle crash bags or inflators. The first improvement to the old process and apparatus involves adjusting the basicity of the water to a pH of greater than 8.0 up to about 12.5via the addition of sodium hydroxide, followed by the addition of sulfur and molybdenum disulfide and finally the sodium azide whereby azide addition is made to a basic mixture of the other ingredients thereby keeping hydrazoic acid concentration levels below about 3 x 10EXP(-3) moles per liter. The second improvement to the old process and apparatus involves (1) softening the water before its use in slurrying the powdered ingredients to remove undesirable Ca and Mg ions and/or (2) adding sodium sulfide and/or tri-sodium phosphate to the slurry to precipitate any remaining undesirable Ca, Mg, Pb, Fe, Mn and Cu ions as non-hazardous compounds. Each of these metal ions is reduced to no more than about 25 ppm or less. These two improvements are joined together to form a system wherein even better safety results occur. The improvements not only extend to the final product produced, but to the intermediates at the slurry stage as well as at the spray dried stage, which products differ due to significant elimination or minimization of hydrazoic acid and other contaminant metal ion species above mentioned.
Olsen Ritchie
Smith Gary L.
Taylor Robert D.
Autoliv Asp Inc.
Gowling Lafleur Henderson Llp
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