Chemistry of inorganic compounds – Zeolite
Patent
1994-05-16
1995-12-12
Bell, Mark L.
Chemistry of inorganic compounds
Zeolite
423DIG24, C01B 3914
Patent
active
054747538
ABSTRACT:
Crystalline 4A zeolites having high calcium ion exchange capacity, well adapted as builder materials for detergent compositions, are prepared by directly admixing an aqueous sodium silicate solution with a first aqueous sodium aluminate solution in a first reaction vessel to form a hydrogel therefrom, and transferring the hydrogel thus formed to a discrete crystallization zone and therein contacting such hydrogel with a crystallization-effecting amount of a second aqueous sodium aluminate solution to convert same into a crystalline 4A zeolite, and, advantageously, filtering, washing and optionally drying such crystalline 4A zeolite.
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Bretaudeau Dominique
Delprato Francois
Malassis Marc
Bell Mark L.
Laviosa Rhone-Poulenc
Sample David
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