METHOD FOR CONTINUOUS PRODUCTION OF NITROBENZENE
    33.
    发明申请
    METHOD FOR CONTINUOUS PRODUCTION OF NITROBENZENE 有权
    连续生产硝基苯的方法

    公开(公告)号:US20150073180A1

    公开(公告)日:2015-03-12

    申请号:US14240058

    申请日:2012-08-29

    Abstract: The invention relates to a method for producing nitrobenzene, in which crude nitrobenzene is first produced by nitrating benzene and said crude nitrobenzene is then washed in succession in at least one acid wash, in at least one alkaline wash and in at least one neutral wash, at least one additional wash with an aqueous solution of a potassium salt being interposed between the last alkaline wash and the first neutral wash.

    Abstract translation: 本发明涉及生产硝基苯的方法,其中首先通过硝化苯生产粗硝基苯,然后将所述粗硝基苯在至少一种酸洗涤液,至少一种碱性洗涤液和至少一种中性洗涤液中连续洗涤, 在最后的碱性洗涤和第一中性洗涤之间插入钾盐水溶液至少一次另外的洗涤。

    Process for working up the waste water obtained in the preparation of dinitrotoluene
    37.
    发明授权
    Process for working up the waste water obtained in the preparation of dinitrotoluene 有权
    处理二硝基甲苯制备中得到的废水的方法

    公开(公告)号:US06936741B2

    公开(公告)日:2005-08-30

    申请号:US10878211

    申请日:2004-06-28

    Abstract: The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from the dinitrotoluene washing step, and distillate from the sulfuric acid concentration step. The process comprises, a) combining the acidic and alkaline waste waters from the washing step and the aqueous distillate from the sulfuric acid concentration step such that the resulting mixture has a pH below 5, b) separating the aqueous and organic phases which are formed by phase separation, c) subjecting the aqueous phase from b) to an extraction step, wherein d) the organic components contained in the aqueous phase from c) are extracted with toluene, and e) introducing the toluene phase enriched with the organic components into the toluene nitration.

    Abstract translation: 本发明涉及一种处理或处理在用硝酸将甲苯硝化成二硝基甲苯期间形成的废水的处理方法。 这些含有来自二硝基甲苯洗涤步骤的酸性洗涤水和碱性洗涤水的含水废水,以及来自硫酸浓缩步骤的馏出物。 该方法包括:a)将来自洗涤步骤的酸性和碱性废水与来自硫酸浓缩步骤的含水馏出物混合,使得所得混合物的pH值低于5,b)将由下式形成的水相和有机相分离: 相分离,c)使来自b)的水相进行萃取步骤,其中d)来自c)的水相中含有的有机组分用甲苯萃取,e)将富含有机组分的甲苯相引入 甲苯硝化。

    Preparation of p-nitrophenolic compounds
    38.
    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 classification number: C07C201/00 C07C201/08

    Abstract: 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.

    Abstract translation: 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。

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