Method for the neutralization of A-zeolite obtained in synthesis plants
AssigneeMira Lanza S.p.A.
InventorsNistri Ugo, Colombo Paolo, Da Col Lino
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Abstract
The filter press cake, obtained by separation of the raw Zeolite from the major portion of the mother liquor and not washed, or only partially washed, is additivated with a suitable surface-active agent, added in the amount of from 1 to 2% in weight on the weight of the wet Zeolite. The thus-fluidized Zeolite is treated in a high-turbulence zone with sulphuric acid at a concentration greater than 70%, which is added in such an amount as to produce a nearly complete neutralization of the final Zeolite.
Claims10
A method for the neutralization of a wet filter cake of alkaline A-Zeolites which are unstable in a strong acid environment comprising the steps of:
- adding an effective amount of a surface-active agent to said wet filter cake of alkaline A-Zeolite to form an alkaline suspension of A-Zeolite, and
- quickly neutralizing said alkaline suspension of A-Zeolite with a strong acid to maintain a pH of at least about 10 to avoid damage to said A-Zeolite.
Dependencies are inferred from the claim text.