FIELD: processes for preparing crystalline zeolite alumosilicates. SUBSTANCE: a reaction mixture is subjected to hydrothermal crystallization. The reaction mixture contains SiO2 and Al2O3 sources, mineral substances and crystalline nuclei in an aqueous alkali medium, the molar ratios being as follows: SiO2/Al2O3 20-60; OH-/SiO2 0.10 - 0.20; and H2S/SiO2 20 - 60. The hydrothermal crystallization is carried out in two stages: the first stage covers a temperature range of 245-325 C for 1-20 min; the second stage covers a temperature range of 120-225 C for 1-100 hr. EFFECT: greater efficiency of the process.
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|---|---|---|---|
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|
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| METHOD FOR PRODUCTION OF SYNTHETIC CRYSTALLINE ALUMINOSILICATE | 1990 |
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| METHOD FOR MODIFIED ZEOLITE PRODUCTION | 0 |
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