Process for purifying crude p-aminophenol
    46.
    发明授权
    Process for purifying crude p-aminophenol 失效
    粗制对氨基苯酚的纯化方法

    公开(公告)号:US4139562A

    公开(公告)日:1979-02-13

    申请号:US886129

    申请日:1978-03-13

    CPC分类号: A01N43/90 C07C215/76

    摘要: A process for purifying crude p-aminophenol which contains 4,4'-diaminodiphenyl ether and other impurities, which process comprising adding an alkali metal compound to the crude p-aminophenol in an aqueous medium in an atmosphere of an inert gas and, if necessary, in the presence of a reducing agent to give an aqueous solution of an alkali metal salt of p-aminophenol, and contacting the aqueous solution with an inert organic solvent immiscible with water to permit 4,4'-diaminodiphenyl ether and other impurities to be separated by extraction in the solvent.

    摘要翻译: 一种纯化含有4,4'-二氨基二苯醚和其它杂质的粗对氨基苯酚的方法,该方法包括在惰性气体气氛中的水介质中将粗碱对氨基苯酚加入碱金属化合物,如有必要 在还原剂的存在下,得到对氨基苯酚的碱金属盐的水溶液,并使水溶液与不与水混溶的惰性有机溶剂接触,以使4,4'-二氨基二苯醚和其它杂质为 通过在溶剂中萃取分离。

    High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same
    47.
    发明授权
    High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same 失效
    高纯度1,3-二烷基-2-咪唑啉酮及其制备方法

    公开(公告)号:US5872260A

    公开(公告)日:1999-02-16

    申请号:US897768

    申请日:1997-07-21

    IPC分类号: C07D233/32

    CPC分类号: C07D233/32

    摘要: In a process for reacting N,N'-dialkylethylenediamine with urea in an aprotic polar solvent to prepare 1,3-dialkyl-2-imidazolidinone, a process comprising progressing the reaction while continuously adding N,N'-dialkylethylnediamine and urea into the aprotic polar solvent. The process is a high-yield manufacturing process in industry capable of efficiently producing very high purity 1,3-dialkyl-2-imidazolidinone which contains less than 0.1% by weight of by-product 1,3-dialkyl-2-imidazolidinimine derived from the raw materials.

    摘要翻译: 在非质子极性溶剂中使N,N'-二烷基乙二胺与脲反应以制备1,3-二烷基-2-咪唑啉酮的方法,包括进行反应,同时连续加入N,N'-二烷基乙二胺和尿素至非质子传递 极性溶剂。 该方法是能够有效地生产非常高纯度的1,3-二烷基-2-咪唑啉酮的工业中的高产量制备方法,该1,3-二烷基-2-咪唑啉酮含有少于0.1%重量的副产物1,3-二烷基-2-咪唑啉亚胺衍生自 的原料。

    Process for producing alkoxy-substituted triphenylamines
    48.
    发明授权
    Process for producing alkoxy-substituted triphenylamines 失效
    制备烷氧基取代的三苯胺的方法

    公开(公告)号:US5654483A

    公开(公告)日:1997-08-05

    申请号:US575091

    申请日:1995-12-19

    摘要: A process for producing an alkoxy-substituted tri-phenylamine comprising reacting an alkoxy-substituted cyclohexanone with a diphenylamine or an aniline, while forming said cyclohexanone in the same system from an alkoxy-substituted phenol by using said phenol as a hydrogen acceptor, in the presence of a hydrogen transfer catalyst and a catalytic amount of the alkoxy-substituted cyclohexanone corresponding to the alkoxy-substituted phenol used for the reaction, or after converting partially the alkoxy-substituted phenol to a catalytic amount of the alkoxy-substituted cyclohexanone under a hydrogen pressure in the presence of a hydrogen transfer catalyst, wherein a surface-supported catalyst is used as the hydrogen transfer catalyst.

    摘要翻译: 一种制备烷氧基取代的三苯胺的方法,包括使烷氧基取代的环己酮与二苯胺或苯胺反应,同时通过使用所述苯酚作为氢受体,从烷氧基取代的苯酚形成所述环己酮,同时在 存在氢转移催化剂和催化量的对应于用于反应的烷氧基取代的苯酚的烷氧基取代的环己酮,或在氢气下部分将烷氧基取代的苯酚转化为催化量的烷氧基取代的环己酮之后 在氢转移催化剂存在下的压力,其中使用表面负载的催化剂作为氢转移催化剂。