Method for preparing polyether glycols
AssigneeE. I. Du Pont de Nemours and Company
InventorHarold E. Bellis
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Abstract
The production of undesirable oligomeric cyclic ethers in the preparation of polyether glycols is reduced by using as a catalyst an acid-activated montmorillonite clay which contains, per gram, 0.1 to 0.9 milliequivalent of hydrogen ions having pK.sub.a values of -3 to -8.
Claims5
In a process for preparing a polyether glycol by the copolymerization of tetrahydrofuran and an alkylene oxide of 2 to 6 carbon atoms, in which an acid-activated montmorillonite clay is used as a catalyst, the improvement of using a clay which contains, per gram, 0.1 to 0.9 milliequivalent of hydrogen ions having pK.sub.a values of -3 to -8.
In a process for preparing a polyether glycol by the copolymerization of tetrahydrofuran and ethylene oxide using an acid activated montmorillonite clay as a catalyst, the improvement of using Wyoming bentonite which contains, per gram, 0.2 to 0.6 milliequivalent of hydrogen ions having pK.sub.a values of -5 to -8.
Dependencies are inferred from the claim text.