Calcium-phosphate type hydroxyapatite for chromatographic separa

Details Calcium-phosphate type hydroxyapatite for chromatographic separa Calcium-phosphate type hydroxyapatite for chromatographic separa

1988-09-12

1992-01-21

Langel, Wayne A.

Liquid purification or separation

Processes

Chromatography

2101982, 2105021, 423308, 423309, 423311, B01D 1508, C01B 2532

Patent

active

050825666

ABSTRACT:
A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.

REFERENCES:
patent: 3737516 (1973-06-01), Jenner
patent: 4481175 (1984-11-01), Iino et al.
patent: 4497075 (1985-02-01), Niwa et al.
patent: 4711769 (1987-12-01), Inoue et al.
patent: 4743377 (1988-05-01), Ohtsu et al.
patent: 4794171 (1988-12-01), Tagaya et al.
Skoog et al, Fundamentals of Analytical Chemistry, Holt, Rinehart and Winston, Inc. (1963), pp. 359, 360.

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