Process for preparing crystalline silicas
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United States of America Patent
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Sep 20, 1988
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N/A
app pub date -
Dec 19, 1983
filing date -
Dec 19, 1983
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Expired
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Abstract
Disclosed is a process for preparing crystalline silicas having the monoclinic symmetry which comprises the step of calcining in air for at least 3 hours at a temperature of at least 500.degree. C. a crystalline silica of the silicalite type having a silica to alumina atomic ratio of at least 80.
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