Preparation of picric acid
    1.
    发明授权
    Preparation of picric acid 失效
    苦味酸的制备

    公开(公告)号:US6063967A

    公开(公告)日:2000-05-16

    申请号:US94595

    申请日:1998-06-15

    CPC分类号: C07C201/16 C07C201/08

    摘要: Picric acid, namely, 2,4,6-trinitrophenol, is readily and effectively prepared by nitrating o-nitrophenol and/or p-nitrophenol into at least one dinitrophenol in a nitric acid medium of reaction, characteristically essentially consisting of nitric acid or immixture thereof with a strong co-acid, the at least one dinitrophenol remaining soluble in the medium of reaction, and therein completing nitration of the at least one dinitrophenol and precipitating picric acid therefrom.

    摘要翻译: 苦味酸,即2,4,6-三硝基苯酚,通过在硝酸反应介质中将邻硝基苯酚和/或对硝基苯酚硝化成至少一种二硝基酚而容易且有效地制备,其特征在于主要由硝酸或杂质组成 其中所述至少一种二硝基苯酚仍然可溶于所述反应介质中,并且其中完成所述至少一种二硝基苯酚的硝化并从其沉淀出苦味酸。

    Preparation of p-nitrophenolic compounds
    2.
    发明授权
    Preparation of p-nitrophenolic compounds 失效
    对硝基酚类化合物的制备

    公开(公告)号:US5414148A

    公开(公告)日:1995-05-09

    申请号:US249200

    申请日:1994-05-26

    CPC分类号: C07C201/00 C07C201/08

    摘要: p-Nitrophenolic compounds, e.g., p-nitrophenol itself, are selectively prepared by (a) reacting a phenolic compound with a nitrosating agent in the presence of sulfuric acid, the concentration of which H.sub.2 SO.sub.4 being at least 60%, (b) oxidizing the p-nitrosophenolic compound thus formed with nitric acid, the concentration of sulfuric acid in the medium of reaction, upon completion of oxidation, being no greater than 80%, and (c) separating the p-nitrophenolic compound which thus precipitates.

    摘要翻译: 通过(a)在硫酸存在下使酚类化合物与亚硝化剂反应,其中H 2 SO 4的浓度为至少60%,(b)将硝基酚类化合物氧化为 由硝酸形成的对亚硝基苯酚化合物,氧化后的反应介质中的硫酸浓度不大于80%,(c)分离因此析出的对硝基酚化合物。