Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1985-01-02
1986-04-08
Doll, John
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
423324, 423327, 423328, 423329, 423332, 423333, C01B 1514
Patent
active
045812136
ABSTRACT:
Crystalline sodium silicates having a sheet structure and an ion exchange capacity of 83-130 mmol of Na.sup.+ /mol of SiO.sub.2 are prepared by a method in which an aqueous reaction mixture which contains sodium silicate, has a molar ratio SiO.sub.2 /Na.sub.2 O of 3.9:1 to 15:1 and a molar ratio H.sub.2 O/(Na.sub.2 O+SiO.sub.2) of 3:1 to 80:1 and contains 0.01 to 30% by weight, relative to the amount of SiO.sub.2 in the reaction mixture employed, of seed crystals of the desired crystalline sodium silicate is prepared, the mixture is heated to temperatures of 160.degree. to 250.degree. C., the reaction is carried out at least until, in the X-ray diffraction pattern of a sample filtered off under suction and dried at 120.degree. C., the ratio of the intensity of the reflection at the interplanar spacing d.sub.1 =(20.+-.2).multidot.10.sup.-8 cm to the intensity of any reflection present at the interplanar spacing d.sub.2 =(15.5.+-.1.5).multidot.10.sup.-8 cm is at least 3:1, and the reaction is terminated before the intensity of the reflection at the interplanar spacing d.sub.3 =(3.34.+-.0.04).multidot.10.sup.-8 cm reaches or exceeds the intensity of the reflection at the interplanar spacing d.sub.4 =(3.44.+-.0.04).multidot.10.sup.-8 cm. A crystalline silicic acid having a sheet structure and the overall composition H.sub.2 Si.sub.x O.sub.2x+1, wherein 15<x<24, and its sodium salt are described.
REFERENCES:
patent: 4285922 (1981-08-01), Audeh et al.
patent: 4430314 (1984-02-01), Audeh et al.
patent: 4481174 (1984-11-01), Baacke et al.
Klaus Beneke and Gerhard Lagaly, "Kenyaite-Synthesis and Properties", American Mineralogist, vol. 68, pp. 818-826 (1983).
Eugster, Science, 157:1177-1180 (1967).
Rooney, Amer. Mineral., 54:1034-1043 (1969).
Maglione et al, C. R. Acad. Sci., (Paris) Ser. D 277:1721-4 (1973).
McAtee et al, Amer. Mineral, 53:2061-2068 (1968).
McCulloch, JACA, 74:2453-2456 (1952).
Legaly et al, Proc. Int. Clay Conf., 1972, 663-673 (1973).
Iler, J. Colloid Sci., 19:648-657 (1964).
Legaly et al, Z. Naturforsch. 28b:234-238 (1973).
Legaly et al, Z. Naturforsch., 346: 666-674 (1979).
Heydemann, Beitr. Min. Petrogr., 20:242-259 (1964).
Mitsyuk et al, Geochem. Int., 13: 101-111 (1976).
Benecko et al, Z. Naturforsch, 34b: 648-649 (1979).
Legaly, Adv. Colloid Interface Sci., 11:105-148 (1979).
Doll John
Hoechst Aktiengesellschaft
Leeds Jackson
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