Process for the purification of crude
2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane
    1.
    发明授权
    Process for the purification of crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane 失效
    粗制2,2-二 - (3,5-二甲基-4-羟苯基) - 丙烷的纯化方法

    公开(公告)号:US4990686A

    公开(公告)日:1991-02-05

    申请号:US457419

    申请日:1989-12-27

    IPC分类号: C07C37/84 C07C39/16

    CPC分类号: C07C37/84

    摘要: Crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)propane (=tetramethyl-bisphenol A=TMBPA) can be purified by recrystallization, if C.sub.1 -C.sub.4 -monoalcohols with a water content of 2 to 40% by weight relative to the total weight of alcohol and water are used in an amount of 70 to 250% by weight, relative to the amount of TMBPA and the recrystallization is carried out at a temperature of 65.degree. to 150.degree. C.

    摘要翻译: 通过重结晶可以纯化2,2-二 - (3,5-二甲基-4-羟基苯基)丙烷(=四甲基 - 双酚A = TMBPA),如果水含量为2〜40%的C 1 -C 4 - 一元醇通过 相对于醇和水的总重量的重量相对于TMBPA的用量为70〜250重量%,在65〜150℃的温度下进行再结晶。

    Process for preparing di-C.sub.1 - C.sub.4 -alkyl 5-nitro-isophthalates
    7.
    发明授权
    Process for preparing di-C.sub.1 - C.sub.4 -alkyl 5-nitro-isophthalates 失效
    制备5-硝基 - 间苯二甲酸二-C1-4-烷基酯的方法

    公开(公告)号:US6002041A

    公开(公告)日:1999-12-14

    申请号:US73485

    申请日:1998-05-06

    IPC分类号: C07C205/57 C07C205/00

    CPC分类号: C07C201/12

    摘要: Particularly pure di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalates are obtained in good yield and in a simple process by dissolving 5-nitro-isophthalic acid in a mixture of a C.sub.1 -C.sub.4 -alkyl alcohol and a solvent which is miscible or only partially miscible with water, heating in the presence of a strong acid, thus forming a second, aqueous phase, crystallizing out, after the esterification reaction has ended, the di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalate formed from the organic phase by cooling and removing the aqueous phase before or after the di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalate is separated off.

    摘要翻译: 通过将5-硝基间苯二甲酸溶解在C1-C4烷基醇和可混溶的溶剂的混合物中,以良好的产率和简单的方法得到特别纯的5-硝基 - 间苯二甲酸二 - 仅在水中部分混溶,在强酸存在下加热,从而形成第二个水相,在酯化反应结束后结晶出由有机物形成的5-硝基间苯二甲酸二C1-C4烷基酯 在分离出5-硝基间苯二甲酸二-C 1 -C 4烷基酯之前或之后,通过冷却和除去水相来进行相。