Liquid purification or separation – With means to add treating material – Chromatography
Patent
1995-03-13
1996-12-31
Therkorn, Ernest G.
Liquid purification or separation
With means to add treating material
Chromatography
210635, 210656, 2105021, 502404, 502439, 536 58, 536 63, B01D 1508
Patent
active
055890610
ABSTRACT:
A process for preparing a cellulose ester liquid chromatographic stationary phase by reacting cellulose with an aromatic acid halide, such as p-toluoyl chloride, in the presence of a base catalyst, such as pyridine, the reaction temperature and the concentration of base catalyst being below the temperature and concentration at which the cellulose ester dissolves, the reaction time being less than the reaction time at which the cellulose ester dissolves. Similarly, a process for preparing a cellulose carbamate liquid chromatographic stationary phase by reacting cellulose with an aromatic isocyanate, such as 3,5-dimethyl phenyl isocyanate, in the presence of a base catalyst, such as pyridine, the reaction temperature and the concentration of base catalyst being below the temperature and concentration at which the cellulose carbamate dissolves, the reaction time being less than the reaction time at which the cellulose carbamate dissolves.
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Stevens Timothy S.
The Dow Chemical Company
Therkorn Ernest G.
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