| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for obtaining an aqueous alkaline solution of a high-purity aromatic dihydroxy compound by treating a large amount of waste aromatic polycarbonate at a low cost. <P>SOLUTION: The method for obtaining the aqueous alkaline solution of the purified aromatic dihydroxy compound from the waste aromatic polycarbonate comprises a step wherein the waste aromatic polycarbonate is decomposed through transesterification in the presence of a 1-4C alcohol, a chlorinated compound organic solvent and an alkali metal hydroxide (step a), a step wherein an aqueous acid solution is added to a reaction liquid obtained through decomposition, an organic solvent phase is separated from an aqueous phase and the organic solvent phase is recovered (step b), a step wherein the aromatic dihydroxy compound is obtained from the organic solvent phase through distillation (step c) and a step wherein the obtained aromatic dihydroxy compound is dissolved in an aqueous alkali metal hydroxide solution and the obtained aqueous alkali solution of the aromatic dihydroxy compound is contacted with activated carbon (step d). <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
