Sodium aluminate → Molecular sieve

Participants

Reaction Steps

For this purpose the alkali metal, preferably sodium aluminate solution was admixed in a 15 liter vessel with the alkali metal, preferably sodium silicate solution, while stirring vigorously (temperature of the solutions: 20° to 80° C.). In exothermal reaction there formed as primary precipitation product an X-ray amorphous sodium aluminosilicate. After vigorously stirring for 10 minutes, the suspension of the precipitate was processed either directly, i.e. without crystallization, or it was left standing for 3 to 6 hours at 80° C. for the purpose of crystallization. The products thus obtained were completely crystalline according to X-ray structure analysis.

Provenance & Evidence