Removal of catalysts from polyols
Abstract
Abstract A METHOD FOR REMOVING WATER-SOLUBLE INPURITIES FROM WATER-INSOLUBLE POLYETHERS WHICH COMPRISES PROVIDING A MIXTURE OF WATER, POLYETHER, A SOLVENT IN WHICH THE POLYETHER IS SOLUBLE, AND AN ACID. THE SOLVENT EMPLOYED IS SUBSTANTALLY IMMISCIBLE IN WATER, HAS A DENSITY SUBSTANTIALLY DIFFERENT FROM WATER AND IS RELATIVELY INERT WITH RESPECT TO THE POLYETHER AND WATER, WHEREBY A POLYETHERSOLVENT SOLUTION IS FORMED WHICH IS SUBSTANTIALLY IMMISCIBLE IN WATER. THE SOLVENT IS EMPLOYED IN AN AMOUNT SUFFICIENT TO ADJUST THE DENSITY DIFFERENTIAL BETWEEN THE POLYETHER-SOLVENT SOLUTION AND WATER TO AT LEAST ABOUT 0.03 GRAM PER MILLILITER. THE AMOUNT OF THE ACID IS SUFFICIENT TO ADJUST THE PH OF THE MIXTURE TO A VALUE NOT GREATER THAN ABOUT 8.0. THE POLYMER-SOLVENT SOLUTION IS THEN SEPARATED FROM THE WATER BY A SUITABLE METHOD SUCH AS ELECTROSTATIC COALESCENCE OF SUBJECTION TO CENTRIFUGAL FORCE. A STREAM OF WATER CONTAINING DISSOLVED THEREIN THE WATERSOLUBLE IMPURITIES AND A STREAM OF POLYETHER-SOLVENT SOLUTION ARE SEPARATELY RECOVERED AFTER THE SEPARATION. FOLLOWED BY SEPARATING THE SOLVENT FROM THE POLYETHER-SOLVENT SOLUTION.
Inventors
- 👤 J Louvar
- 👤 N Nichols
Bibliographic Details
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