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27 条记录 (耗时 0.024 秒)

    Photographic products and processes employing novel nondiffusible pyridylazopyrazole or pyrimidylazopyrazole dye-releasing compounds
    1.
    发明授权
    Photographic products and processes employing novel nondiffusible pyridylazopyrazole or pyrimidylazopyrazole dye-releasing compounds 失效
    使用新型非扩散性吡啶基吡唑或嘧啶基吡唑类染料释放化合物的摄影产品和方法

    公开(公告)号：US4148641A

    公开(公告)日：1979-04-10

    申请号：US832310

    申请日：1977-09-12

    申请人： James A. Green, II ,  Norman W. Kalenda

    发明人： James A. Green, II ,  Norman W. Kalenda

    IPC分类号： C09B29/50 ,  G03C8/10 ,  G03C7/00 ,  G03C1/10 ,  G03C1/40 ,  G03C5/54

    CPC分类号： G03C8/10 ,  C09B29/366

    摘要： Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable pyridylazopyrazole or pyrimidylazopyrazole dye moiety. The compound contains in the ortho position of the azopyrazole moiety a metal chelating group, a salt thereof or a hydrolyzable precursor thereof, and a ballasted carrier moiety which is capable of releasing the diffusible azo dye under alkaline conditions. The dye is transferred imagewise to an image-receiving layer where it is contacted with metal ions to form a metal-complexed azo dye transfer image of excellent stability.

    摘要翻译： 描述了摄影元件，扩散转移组合和方法，其使用具有可释放的吡啶基吡唑或嘧啶基吡唑类染料部分的新型不扩散化合物。 化合物在氮杂拉唑部分的邻位含有金属螯合基团，其盐或其可水解的前体，以及能够在碱性条件下释放可扩散偶氮染料的压载载体部分。 将染料成像转移到图像接收层，在其中与金属离子接触以形成具有优异稳定性的金属络合的偶氮染料转移图像。

    Methods for removing biuret from urea
    4.
    发明授权
    Methods for removing biuret from urea 失效
    从尿素中除去缩二脲的方法

    公开(公告)号：US4654442A

    公开(公告)日：1987-03-31

    申请号：US567047

    申请日：1983-12-30

    申请人： Donald C. Young ,  James A. Green, II

    发明人： Donald C. Young ,  James A. Green, II

    IPC分类号： C07C273/16 ,  C07C126/08

    CPC分类号： C07C273/16

    摘要： Biuret is removed from biuret-containing aqueous urea solutions in a multi-cycle process which involves sequential (A) removal of biuret by contact with an anion exchanger and (B) regeneration of the anion exchanger, in which method, in one or more cycles, the anion exchanger regenerant comprises an aqueous solution of a strong base which has been employed to regenerate the anion exchanger in a previous cycle. This procedure allows for recycling, and thus reuse, of the strong base regenerant which results in significant economy. Methods are also provided in which (A) one or both of the aqueous urea solution and regenerant have a relatively low calcium equivalent content, (B) a substantially non-alkaline regenerant is employed either as the only regenerant in one or more cycles or as a partial regenerant before regeneration with the strong base regenerant, (C) the carbonate content of one or more of the aqueous process streams is controlled and/or reduced, and/or (D) the concentration of biuret in the recycled strong base regenerant is periodically reduced. All of these factors contribute to process economy, anion exchanger life, and more efficient, less frequent regeneration.

    摘要翻译： 在多循环过程中，从缩二脲水溶液中除去含脲脲水溶液，其涉及通过与阴离子交换剂接触而顺序地（A）除去缩二脲，和（B）阴离子交换剂的再生，其中以一个或多个循环 ，阴离子交换剂再生剂包括强碱的水溶液，其已用于在先前循环中再生阴离子交换剂。 该方法允许再次使用，从而重新使用强碱基再生剂，这导致显着的经济性。 还提供了其中（A）尿素水溶液和再生剂中的一种或两种具有相对低的钙当量含量的方法，（B）基本上非碱性的再生剂被用作一个或多个循环中的唯一再生剂，或作为 用强碱再生剂再生之前的部分再生剂，（C）一种或多种含水工艺流的碳酸盐含量被控制和/或减少，和/或（D）再循环的强碱再生剂中的缩二脲浓度是 定期减少。 所有这些因素都有助于过程经济性，阴离子交换寿命，更有效率，更不频繁的再生。

    Biuret manufacture
    5.
    发明授权
    Biuret manufacture 失效
    Biuret制造

    公开(公告)号：US4645860A

    公开(公告)日：1987-02-24

    申请号：US732175

    申请日：1985-05-07

    申请人： James A. Green, II ,  Donald C. Young

    发明人： James A. Green, II ,  Donald C. Young

    IPC分类号： C07C273/18 ,  C07C275/62 ,  C07C126/08

    CPC分类号： C07C273/189 ,  C07C275/62 ,  Y02P20/125

    摘要： Methods are provided for recovering biuret from aqueous urea solutions and for producing relatively concentrated biuret-containing extracts which involve contacting a biuret-containing aqueous urea solution with the hydroxide ion form of an anion exchanger to retain at least a portion of the biuret on the exchanger, contacting the resulting biuret-containing ion exchanger with an aqueous extractant under conditions sufficient to form a biuret-containing extract, and contacting the resulting biuret-containing extract with the same or other biuret-containing anion exchanger in the same or subsequent cycles under conditions sufficient to increase the biuret concentration of the extract. The biuret-containing urea feed solution may also contain higher molecular weight urea condensation products, and the biuret can be selectively separated from such condensation products by the disclosed methods. Extracts containing about 1 weight percent biuret or more can be obtained from which biuret can be crystallized at temperatures above 0.degree. C., and purified biuret of as much as 99.9 percent plus purity can be obtained from solutions containing higher molecular weight urea condensation products such as triuret, melamine, ammelide, and/or others. An integrated process also is provided which involves heating urea at a temperature sufficient to form biuret (in the presence or absence of higher molecular weight urea condensation products) and recovering biuret from an aqueous solution of the resulting pyrolyzed urea as described.

    摘要翻译： 提供了用于从尿素水溶液中回收缩二脲并用于生产相对浓缩的缩二脲的提取物的方法，其涉及使含缩二脲的尿素水溶液与阴离子交换剂的氢氧根离子形式接触，以将至少一部分缩二脲保留在交换器上 在足以形成含缩二脲的提取物的条件下使得到的含缩二脲离子交换剂与含水萃取剂接触，并在相同或随后的循环中将所得缩二脲萃取物与相同或其它缩二脲包含的阴离子交换剂在条件 足以增加提取物的缩二脲浓度。 含缩脲脲的尿素进料溶液还可以含有较高分子量的尿素缩合产物，并且通过所公开的方法可以将缩二脲与这种缩合产物选择性分离。 可以获得含有约1重量％缩二脲或更多的提取物，其中缩合物可以在高于0℃的温度下结晶，并且可以从含有较高分子量的脲缩合产物的溶液获得高达99.9％的纯度的纯化的缩二脲， 作为triuret，三聚氰胺，ammelide和/或其他。 还提供了一种综合方法，其包括在足以形成缩二脲（在存在或不存在较高分子量的脲缩合产物）的温度下加热尿素，并如所述从所得热解脲的水溶液中回收缩二脲。