Method for filtering a three-phased reaction mixture
    2.
    发明授权
    Method for filtering a three-phased reaction mixture 失效
    过滤三相反应混合物的方法

    公开(公告)号:US06478968B1

    公开(公告)日:2002-11-12

    申请号:US09194907

    申请日:1999-03-17

    IPC分类号: B01D6100

    摘要: A method for filtering a three phase reaction mixture comprising a liquid phase, an undissolved solid catalytic phase and a gas phase includes tangentially filtering through a membrane filter at least part of the three phased reaction mixture, and recycling the catalyst while recuperating at least part of the filtrate comprising the reaction products.

    摘要翻译: 用于过滤包含液相,未溶解的固体催化相和气相的三相反应混合物的方法包括通过膜过滤器对至少部分三相反应混合物进行切向过滤,并循环催化剂,同时使至少部分 滤液包含反应产物。

    Method for treating aqueous solutions comprising acids and nitrated compounds
    3.
    发明授权
    Method for treating aqueous solutions comprising acids and nitrated compounds 有权
    用于处理包含酸和硝化化合物的水溶液的方法

    公开(公告)号:US06254789B1

    公开(公告)日:2001-07-03

    申请号:US09485498

    申请日:2000-05-03

    IPC分类号: C02F104

    摘要: The invention concerns a method for treating an aqueous solution derived from sluicing of crude mononitrated or dinitrated aromatic compounds obtained by nitration of the corresponding aromatic compounds, consisting in: (a) contacting said aqueous solution with said aromatic compound thereby obtaining an aqueous phase and an organic phase; (b) recycling said organic phase in the nitration process; (c) distilling said aqueous phase; (d) recycling the resulting concentrated acid solution in the nitration process; (e) recycling or eliminating the recuperated water after distillation.

    摘要翻译: 本发明涉及一种处理衍生自通过硝化相应芳族化合物而得到的粗单硝化或二硝化芳族化合物的水溶液的方法,其包括:(a)使所述水溶液与所述芳族化合物接触,从而获得水相和 有机相; (b)在硝化过程中回收所述有机相; (c)蒸馏所述水相; (d)在硝化过程中回收所得浓酸溶液; (e)蒸馏后回收或除去回收的水。

    Method for purifying lactams
    4.
    发明授权
    Method for purifying lactams 有权
    内酰胺纯化方法

    公开(公告)号:US6100396A

    公开(公告)日:2000-08-08

    申请号:US230588

    申请日:1999-04-23

    摘要: A method for purifying lactams by liquid-liquid extraction and/or processing with an ion exchange resin is disclosed. The method is useful for purifying lactams produced by the cyclising vapour-phase hydrolysis of an aliphatic aminonitrile, and comprises removing the major part of the ammonia before subjecting the lactam to liquid-liquid extraction by means of a solvent including an acidic solvent and/or contacting said lactam with a cation exchange resin. In most applications of the lactam, it is preferable to carry out a hydrogenation step on the compounds of the lactam solution comprising unsaturations, prior to or in addition to the liquid-liquid extraction step and/or the acidic resin contact step. The purification method may also include an oxidation step in addition to or instead of the hydrogenation step. Said method is preferably combined with a distillation step in the presence of a base.

    摘要翻译: PCT No.PCT / FR97 / 01426 Sec。 371日期1999年4月23日第 102(e)1999年4月23日PCT PCT 1997年7月31日PCT公布。 公开号WO98 / 05636 日期1998年2月12日公开了通过液 - 液萃取和/或用离子交换树脂处理来提纯内酰胺的方法。 该方法可用于纯化通过脂族氨基腈的气相汽相水解产生的内酰胺,并且包括在将内酰胺进行液 - 液萃取之前,通过包括酸性溶剂和/或 使所述内酰胺与阳离子交换树脂接触。 在内酰胺的大多数应用中,优选在液 - 液萃取步骤和/或酸性树脂接触步骤之前或之后对包含不饱和的内酰胺溶液的化合物进行氢化步骤。 除了氢化步骤之外或代替氢化步骤,纯化方法还可以包括氧化步骤。 所述方法优选在碱的存在下与蒸馏步骤组合。