Process for the preparation of nicotinic acid
    1.
    发明授权
    Process for the preparation of nicotinic acid 有权
    制备烟酸的方法

    公开(公告)号:US06376677B1

    公开(公告)日:2002-04-23

    申请号:US09597244

    申请日:2000-06-20

    IPC分类号: C07D21330

    CPC分类号: C07D213/803

    摘要: Nicotinic acid is produced from aqueous solutions of ammonium nicotinate by spray-drying. The nicotinic acid can be freed from residual ammonium nicotinate by a thermal post-treatment in a fluidized bed or under reduced pressure. The process is suitable in particular for the work-up of the reaction mixture produced in the oxidation of 3-methylpyridine with atmospheric oxygen, with the ammonia and, if appropriate, the water, being able to be recycled. Nicotinic acid (“vitamin PP”) is an important additive to foodstuffs and feedstuffs.

    摘要翻译: 烟酸通过喷雾干燥由烟酸铵的水溶液产生。 通过在流化床中或减压下的热后处理,烟酸可以从残留的烟酸铵中除去。 该方法特别适用于在3-甲基吡啶与大气氧气氧化反应生成的反应混合物中,与氨和适当的水一起被回收利用。 烟酸(“维生素PP”)是食品和饲料的重要添加剂。

    Process for the preparation of nicotinic acid

    公开(公告)号:US6077957A

    公开(公告)日:2000-06-20

    申请号:US197477

    申请日:1998-11-23

    CPC分类号: C07D213/803

    摘要: Nicotinic acid is produced from aqueous solutions of ammonium nicotinate by spray-drying. The nicotinic acid can be freed from residual ammonium nicotinate by a thermal post-treatment in a fluidized bed or under reduced pressure. The process is suitable in particular for the work-up of the reaction mixture produced in the oxidation of 3-methylpyridine with atmospheric oxygen, with the ammonia and, if appropriate, the water, being able to be recycled. Nicotinic acid ("vitamin PP") is an important additive to foodstuffs and feedstuffs.