Method for preparing crystalline SiO.sub.2 modification

Details Method for preparing crystalline SiO.sub.2 modification Method for preparing crystalline SiO.sub.2 modification

1980-02-27

1981-11-17

Cooper, Jack

Chemistry: physical processes

Physical processes

Crystallization

252449, 423335, 423339, C01B 3312, B01D 900

Patent

active

043009115

ABSTRACT:
A crystalline SiO.sub.2 --modification, which is characterized by an X-ray diffraction diagram having certain diffraction lines, and a process for the preparation of this crystalline SiO.sub.2 --modification by crystallizing reactive amorphous SiO.sub.2 under hydrothermal conditions in the presence of hexamethylenediamine. Sodium ions, phosphate ions and/or sulfate ions may be added for the crystallization.

REFERENCES:
patent: 4061724 (1977-12-01), Grose et al.
patent: 4073865 (1978-02-01), Flanigen

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