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    • 7. 发明申请
    • PROCESS FOR SEPARATING AND PURIFYING HYDROQUINONE FROM CRUDE MIXTURES
    • 从原料混合物中分离和纯化氢醌的方法
    • WO2008000954A3
    • 2008-02-28
    • PCT/FR2007001078
    • 2007-06-27
    • RHODIA RECHERCHES & TECHGAYET HUBERTHEINISCH BRUNO
    • GAYET HUBERTHEINISCH BRUNO
    • C07C37/14C07C39/08
    • C07C37/74C07C37/685C07C39/08
    • The present invention relates to a process of separation and purification allowing purified hydroquinone to be obtained from crude mixtures essentially containing hydroquinone in combination with very small amounts of impurities including resorcinol and pyrogallol. The process of the invention, which involves starting from a crude hydroquinone containing said impurities, is characterized in that it comprises a topping distillation allowing the resorcinol to be removed as the distillation top product, and allowing a crude mixture essentially comprising hydroquinone and the heavy impurities to be recovered at the column bottom, said mixture then being subjected to a bottoming distillation which allows the pyrogallol to be removed at the column bottom and allows hydroquinone in a purified form to be recovered at the column top.
    • 本发明涉及一种分离和纯化方法,其允许纯化的氢醌由主要含有氢醌的粗混合物与非常少量的杂质(包括间苯二酚和连苯三酚)结合得到。 本发明的方法包括从含有所述杂质的粗制氢醌开始,其特征在于其包括顶馏分,允许作为蒸馏顶部产物除去间苯二酚,并允许基本上包含对苯二酚和重杂质的粗混合物 在柱底部回收,所述混合物然后进行底部蒸馏,其允许在塔底部除去连苯三酚,并允许纯化形式的氢醌在塔顶回收。