| 摘要 |
<p>1383287 Polyphenylene ethers GENERAL ELECTRIC CO 15 Oct 1973 [29 Dee 1972] 47976/73 Heading C3R In a process for forming a polyphenylene ether by passing an oxygen-containing gas through a solution of a phenol in the presence of a metal ion-amine complex catalyst, the metal ion component of the catalyst is separated by contacting the reaction solution with a chelating agent for the ion to produce a metal chelate compound which is soluble in an aqueous medium and separating the chelate compound by liquidliquid extraction into an aqueous medium. In examples poly - (2,6 - dimethyl - 1,4 - phenylene) ether is obtained from 2,6-xylenol, the catalysts are complexes prepared from cupric bromide and di-n-butylamine and cupric chloride and di-n-butylamine and the copper ions are removed using as chelating agents ethylenediaminetetraacetic acid, the disodium salt of ethylenediaminetetraacetic acid, nitrilotriacetic acid and citric acid.</p> |
