Process for the manufacture of 4,4' dihydroxydiphenyl
    74.
    发明授权
    Process for the manufacture of 4,4' dihydroxydiphenyl 失效
    制备4,4'-二羟基二苯基的方法

    公开(公告)号:US4243822A

    公开(公告)日:1981-01-06

    申请号:US71572

    申请日:1979-08-31

    摘要: A process for the preparation of 4,4' dihydroxydiphenyl by acidifying an alkali metal salt of 4,4' dihydroxydiphenyl. The alkali metal salt of 4,4' dihydroxydiphenyl is prepared by fusion of an alkali metal hydroxide with alkali metal diphenyl 4,4' disulfonic acid. Because the reaction may be carried out in granular form, or in a reaction which is made highly fluid by using potassium hydroxide with potassium diphenyl 4,4' disulfonic acid, or by reacting the alkali metal 4,4' disulfonic acid in increments with the hydroxide, low molar ratios of hydroxide to alkali metal diphenyl 4'4, disulfonic acid may be used. When potassium diphenyl 4,4' disulfonic acid is used in accordance with the invention, it is prepared by reacting 4,4' diphenyl disulfonic acid with an inorganic neutral potassium salt.

    摘要翻译: 通过酸化4,4'-二羟基二苯基的碱金属盐制备4,4'-二羟基二苯基的方法。 4,4'二羟基二苯基的碱金属盐通过碱金属氢氧化物与碱金属二苯基4,4'-二磺酸的熔融制备。 因为反应可以以颗粒形式进行,也可以通过使用氢氧化钾与二苯基4,4'-二磺酸钾进行高度流动的反应,或者使碱金属4,4'二磺酸与 可以使用氢氧化物,低摩尔比的氢氧化物与碱金属二苯基4'4,二磺酸。 当根据本发明使用二苯基4,4'二磺酸钾时,其通过使4,4'-二苯基二磺酸与无机中性钾盐反应来制备。

    Process for preparing p,p'-biphenol of high purity
    77.
    发明授权
    Process for preparing p,p'-biphenol of high purity 失效
    制备高纯度p,p'-联苯酚的方法

    公开(公告)号:US4205187A

    公开(公告)日:1980-05-27

    申请号:US120

    申请日:1979-01-02

    CPC分类号: C07C37/11 C07C37/50

    摘要: A process for preparing p,p'-biphenol is provided which comprises heating a 4,4'-bis(substituted phenol) at elevated temperatures below the decomposition temperature of p,p'-biphenol in the absence of a catalyst under an inert, non-reactive atmosphere for the length of time sufficient to obtain a reaction product containing a substantial amount of p,p'-biphenol while, preferably, removing the olefin by-product formed and then recovering the p,p'-biphenol product.

    摘要翻译: 提供了一种制备p,p'-联苯酚的方法,该方法包括在不存在催化剂的惰性溶剂存在下,在低于p,p'-联苯酚的分解温度的升高温度下加热4,4'-双(取代的苯酚) 非反应性气氛持续足以获得含有大量p,p'-联苯酚的反应产物的时间,同时优选除去形成的烯烃副产物,然后回收p,p'-联苯酚产物。