| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for separating a glycol with which the glycol can be recovered in high yield from an aqueous solution of the glycol containing a water-soluble inorganic substance and the glycol and the recovered glycol can be reutilized as a resin raw material. <P>SOLUTION: The method is carried out as follows. A water-insoluble inorganic substance is fed into the aqueous solution of the glycol containing the water-soluble inorganic substance and the glycol (steps 1 and 2) and heated while moving the aqueous solution of the glycol to provide a concentrated solution in which water is evaporated (step 3). A solvent in which the water-insoluble inorganic substance is insoluble is fed into the resultant concentrated solution (step 4) and the solvent in which the glycol is dissolved and the inorganic substance are then precipitated or filtered (step 5). Thereby, the glycol is separated from the water-soluble inorganic substance. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
