Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1975-01-31
1976-01-27
Stern, Edward
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
423335, 423339, 252449, 252451, C01B 3312, C01B 3316, C01B 3318
Patent
active
039352994
ABSTRACT:
A process for preparing a wide-pore adsorbent adapted for use in chromatography, comprising mixing fine disperse non-porous silica having a specific surface area S of 35 to 380 m.sup.2 /g with water followed by drying the aqueous suspension at a temperature within the range of 100.degree. to 450.degree.C to give a silica xerogel and particulating thereof. The xerogel, prior to the particulation or thereafter, is subjected to the hydrothermal treatment in an autoclave at a temperature within the range of from 100.degree. to 380.degree.C and under a pressure of 1 to 300 atm., followed by drying at a temperature of 100.degree. to 300.degree.C.
The above-described process enables the preparation of an adsorbent with larger pores as compared to adsorbents prepared from fine disperse non-porous silica and produced by conventional processes. The process according to the present invention makes it possible to produce an adsorbent having a specific surface area within the range of from 2 to 280 m.sup.2 /g and an average pore diameter of from 230 to 30,000 A, while retaining a high pore volume of 0.9 to 1.9 cm.sup.3 /g. Such adsorbent is useful in chromatography for the purposes of separation, purification and analysis of a wide range of substances: from low- and moderately-boiling compounds up to polymers, and more particularly, biopolymers, and viruses.
REFERENCES:
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patent: 2699376 (1955-01-01), Hay
patent: 2982719 (1961-05-01), Gilbert et al.
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patent: 3652216 (1972-03-01), Krekeler et al.
Book "The Colloid Chemistry of Silica and Silicates," by Ralph K. Iler, 1955 Ed., pp. 137, 138. Cornell Univ. Press, Ithaca, N.Y.
Kiselev Andrei Vladimirovich
Kustova Galina Lvovna
Lipkind Boris Alexandrovich
Nikitin Jury Stepanovich
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