Process for continuous purification of bisphenols
    6.
    发明授权
    Process for continuous purification of bisphenols 失效
    双酚连续纯化方法

    公开(公告)号:US4927973A

    公开(公告)日:1990-05-22

    申请号:US285254

    申请日:1988-12-16

    IPC分类号: C07C37/84 C07C39/16

    CPC分类号: C07C37/84

    摘要: A process for the continuous purification of crude bisphenol which comprises (1) forming a single liquid phase comprising a hot mixture of crude bisphenol and water in a ratio substantially of from about 75% to about 85% weight of crude bisphenol to about 15% to about 25% weight water; (2) continuously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising about 70% to about 95% of the total bisphenol in the mixture; (3) passing the three-phase mixture of bisphenol and water to a second crystallization zone operated at about 85.degree. C. to about 97.degree. C. until about 90% to about 99% of the total bisphenol is crystallized; and (4) recovering the purified bisphenol crystals.