Process of using improved silica-based chromatographic supports containing additives
AssigneesPedro B. Macedo, Theodore A. Litovitz
InventorsAaron Barkatt, Pedro B. Macedo
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Abstract
Silica-based chromatographic and reactive materials are disclosed with surfaces modified to contain or to be coated with oxides, hydrous oxides, hydroxides, carbonates or silicates of aluminum, iron, or other suitable metals such as zirconium or titanium. The materials exhibit good resistance to dissolution and resulting loss of activity or clogging. This good resistance is particularly evident even in the high pH region (above 8-9) and in the high temperature region (above 35.degree. C.) where the dissolution rates and solubilities of aluminosilicates and of trivalent iron oxides are much smaller than those of silica.
Claims3
A process for separating materials by liquid chromatography comprising passing said materials through a chromatographic column packed with the chromatographic support formed from porous glass or silica gel modified by a process comprising treating said porous support with a solution of a metal selected from the group consisting of aluminum, iron, zirconium, titanium, chromium, tin, lanthanum, rare earth, alkaline earth, zinc, hafnium, thorium and gallium to sorb said metal onto the porous support and separating said materials on passage of one or more mobile phases having a pH above about 7.5 or a temperature above about 35.degree. C. through said chromatographic column.
Dependencies are inferred from the claim text.