Stablized synthetic zeolite and a process for the preparation thereof
AssigneeKanebo, Ltd.
InventorsSatoshi Ando, Kazuhiko Nakajima, Akira Dohno
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Abstract
Synthetic zeolite is stabilized to water by soaking it in a buffered acid solution for a prolonged time. The stabilized synthetic zeolite does not exhibit alkalinity when it is dispersed in water at room temperature for 24 hours or more, and exhibits improved flowability and almost constant ratios among Na, Al and O along the depth direction from the surface of the zeolite particles.
Claims19
Stabilized fluid Synthetic zeolite, characterized in that a pH of dispersion water of a synthetic zeolite dispersion is in a range of from 5 to 7, where synthetic zeolite is dispersed in distilled water at a concentration of 50 g/liter and maintained at a temperature of 20.degree. to 25.degree. C. for 24 hours, and that the synthetic zeolite shows an angle of response of 40 degrees or less.
A process to prepare stabilized fluid synthetic zeolite, characterized in that synthetic zeolite is soaked in a buffered acid aqueous liquid;
- buffered or non-buffered acid is replenished, if needed, to maintain the pH of the soaking liquid at a value of about 7 or less and the soaking is continued until the pH remains approximately constant for at least 0.5 hour without replenishing the acid;
- and then the synthetic zeolite is heat-dried without being washed or after washed in conditions that the pH of a washing liquid does not substantially exceed about 6.5.
A process of ion-exchanging synthetic zeolite with metal ions, characterized in that the synthetic zeolite is washed with a buffered aqueous acid liquid prior to the ion exchange.
Dependencies are inferred from the claim text.