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15 条记录 (耗时 0.02 秒)

    Method for separating and immobilizing radioactive materials
    1.
    发明授权
    Method for separating and immobilizing radioactive materials 失效
    分离和固定放射性物质的方法

    公开(公告)号：US4891164A

    公开(公告)日：1990-01-02

    申请号：US294951

    申请日：1989-01-06

    申请人： Thomas R. Gaffney ,  JoAnn Henry ,  Michael J. Desmond

    发明人： Thomas R. Gaffney ,  JoAnn Henry ,  Michael J. Desmond

    IPC分类号： G21F9/10

    CPC分类号： G21F9/10

    摘要： A method is disclosed for separating and immobilizing a radioactive material comprising: contacting an aqueous medium containing said radioactive material with a reactive composition comprising at least one alkali metal, at least one Group IIIB metal and at least one phosphorus oxide; maintaining said reactive composition in contact with said aqueous medium for an effective period of time to react a desired amount of said radioactive material with said reactive composition to form a radioactive-material-containing composition; and separating said radioactive-material-containing composition from said aqueous medium. Radioactive-material-containing compositions exhibiting low leach rates are also disclosed.

    摘要翻译： 公开了用于分离和固定放射性材料的方法，包括：使含有所述放射性物质的水性介质与包含至少一种碱金属，至少一种IIIB族金属和至少一种氧化磷的反应性组合物接触; 保持所述反应性组合物与所述水性介质接触有效的时间以使所需量的所述放射性物质与所述反应性组合物反应以形成含放射性材料的组合物; 并将所述含放射性材料的组合物与所述水性介质分离。 还公开了显示低浸出率的含放射性材料的组合物。

    O.sub.2 VSA process with low O.sub.2 capacity adsorbents
    4.
    发明授权
    O.sub.2 VSA process with low O.sub.2 capacity adsorbents 失效
    O2 VSA工艺具有低O2容量吸附剂

    公开(公告)号：US5266102A

    公开(公告)日：1993-11-30

    申请号：US950093

    申请日：1992-09-23

    申请人： Thomas R. Gaffney ,  John F. Kirner ,  Ravi Kumar ,  Robin J. Maliszewskyj ,  William P. Schmidt

    发明人： Thomas R. Gaffney ,  John F. Kirner ,  Ravi Kumar ,  Robin J. Maliszewskyj ,  William P. Schmidt

    IPC分类号： B01D53/04 ,  B01D53/047 ,  B01J20/02 ,  B01J20/18

    CPC分类号： B01D53/0476 ,  B01J20/186 ,  B01D2253/104 ,  B01D2253/106 ,  B01D2253/108 ,  B01D2253/30 ,  B01D2256/12 ,  B01D2257/102

    摘要： The invention is a process for selectively adsorbing nitrogen from a gas mixture which comprises contacting the gas mixture with an adsorbent that has a moderate nitrogen capacity and a high selectivity for nitrogen over the other components in the mixture. With respect to air separation, improved adsorbents have low O.sub.2 capacity with N.sub.2 capacity at roughly the same level as current adsorbents such as CaA. O.sub.2 VSA computer process simulations have shown the unexpected result that for materials with the same binary isothermal working selectivity, those with lower isothermal nitrogen working capacity are superior O.sub.2 VSA adsorbents, provided that they have a nitrogen working capacity of at least about 0.3 mmol/g.

    摘要翻译： 本发明是一种从气体混合物中选择性吸附氮气的方法，该方法包括使气体混合物与混合物中其它组分具有适度氮气容量和高选择性氮气的吸附剂接触。 关于空气分离，改进的吸附剂具有低的O2容量，N2容量与目前的吸附剂如CaA大致相同。 O2 VSA计算机过程模拟已经显示了对于具有相同二元等温工作选择性的材料的意想不到的结果，具有较低等温氮工作能力的那些是优异的O 2 VSA吸附剂，只要它们具有至少约0.3mmol / g的氮气加工能力 。

    Preparation of methylamines using shape selective chabazites
    6.
    发明授权
    Preparation of methylamines using shape selective chabazites 失效
    使用形状选择性菱沸石制备甲胺

    公开(公告)号：US5399769A

    公开(公告)日：1995-03-21

    申请号：US253872

    申请日：1994-06-03

    申请人： Frederick C. Wilhelm ,  Gene E. Parris ,  Brent A. Aufdembrink ,  Thomas R. Gaffney

    发明人： Frederick C. Wilhelm ,  Gene E. Parris ,  Brent A. Aufdembrink ,  Thomas R. Gaffney

    IPC分类号： C07C209/16

    CPC分类号： C07C209/16

    摘要： This invention relates to a process for producing a nonequilibrium distribution of methylamines by the catalyzed reaction of methanol and/or dimethyl ether with ammonia and by the catalytic reforming of a methylamine containing feedstock. One process selectively affords a reaction product enriched in mono and dimethylamines and low in trimethylamine, at high conversion of methanol or dimethylether. A variation of the process effects reforming a methylamine containing feedstock, optionally containing ammonia over a catalyst. The key to achieving this low TMA selectivity at high conversion resides in the use of a microporous zeolite, preferably chabazite, catalyst having a geometric selectivity index (GSI) less about 3, a shape selectivity index (SSI) greater than about 5 and a sorption capacity for 1-PrOH of at least 0.5 mmol/g.

    摘要翻译： 本发明涉及通过甲醇和/或二甲醚与氨的催化反应和含甲胺原料的催化重整来生产甲胺的非平衡分布的方法。 在甲醇或二甲醚的高转化率下，一种方法选择性地提供富含单胺和二甲胺和低三甲胺的反应产物。 重整含甲胺原料的工艺效果的变化，任选地在催化剂上含有氨。 在高转化率下实现这种低TMA选择性的关键在于使用微孔沸石，优选菱沸石，几何选择性指数（GSI）小于约3，大于约5的形状选择性指数（SSI）和吸附 1-PrOH的容量至少为0.5mmol / g。

    Separation of amides with molecular sieves
    10.
    发明授权
    Separation of amides with molecular sieves 失效
    用分子筛分离酰胺

    公开(公告)号：US4996322A

    公开(公告)日：1991-02-26

    申请号：US351987

    申请日：1989-05-15

    申请人： Ronald Pierantozzi ,  Mildred A. Miller ,  Mark L. Listemann ,  Thomas R. Gaffney ,  Charles G. Coe

    发明人： Ronald Pierantozzi ,  Mildred A. Miller ,  Mark L. Listemann ,  Thomas R. Gaffney ,  Charles G. Coe

    IPC分类号： C07C231/24

    CPC分类号： C07C231/24

    摘要： Amides having different molecular kinetic diameters or heats of adsorption, such as formamide and N-(1-alkoxyethyl)formamide, are separated under mild conditions with a molecular sieve which selectively adsorbs one of the amides, such as formamide. N-vinylformamide can be purified by removing formamide remaining in synthesis process streams using this technique. The adsorbed amide can be desorbed by heating the molecular sieve in either inert or reactive atmospheres. Preferred molecular sieves include the zeolites of types A, X, Y, molecular sieves of the MFI topology, chabazite, and mordenite. Calcium chabazite is particularly versatile and effective.

    摘要翻译： 具有不同分子动力学直径或吸附热的酰胺如甲酰胺和N-（1-烷氧基乙基）甲酰胺在温和条件下用选择性吸附一种酰胺如甲酰胺的分子筛分离。 可以使用该技术通过除去残留在合成工艺流中的甲酰胺来纯化N-乙烯基甲酰胺。 吸附的酰胺可以通过在惰性或反应性气氛中加热分子筛来解吸。 优选的分子筛包括MFI拓扑结构类型A，X，Y，分子筛的沸石，菱沸石和丝光沸石。 钙菱沸石是特别多功能和有效的。