Process for manufacturing MCM-22 family molecular sieves

Chemistry of inorganic compounds – Zeolite – Structure defined x-ray diffraction pattern

Reexamination Certificate

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C423S702000, C423S706000, C208S046000, C208S111010, C208S135000

Reexamination Certificate

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08080234

ABSTRACT:
A method of manufacturing a molecular sieve of the MCM-22 family, said method comprising the steps of (a) providing a mixture comprising at least one source of ions of tetravalent element, at least one source of alkali metal hydroxide, at least one directing-agent (R), water, and optionally at least one source of ions of trivalent element, said mixture having the following mole composition:Y:X2=10 to infinityH2O:Y=1 to 20OH−:Y=0.001 to 2M+:Y=0.001 to 2R:Y=0.001 to 0.34wherein Y is a tetravalent element, X is a trivalent element, M is an alkali metal; (b) treating said mixture at crystallization conditions for less than 72 hr to form a treated mixture having said molecular sieve, wherein said crystallization conditions comprise a temperature in the range of from about 160° C. to about 250° C.; and (c) recovering said molecular sieve.

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