Temperature swing adsorption process
    1.
    发明授权
    Temperature swing adsorption process 失效
    变温吸附过程

    公开(公告)号:US06416569B1

    公开(公告)日:2002-07-09

    申请号:US09648802

    申请日:2000-08-28

    IPC分类号: B01D5304

    摘要: Nitrogen oxides and low molecular weight hydrocarbons are removed from air by subjecting the air to a temperature swing adsorption process using as the adsorbent a composite zeolite product containing both zeolite type A and zeolite type X. The composite zeolite product is prepared by crystallizing a sodium ion- or sodium ion- and potassium ion-containing alumina-silica hydrogel under conditions which result in the production of a zeolitic composite which contains both zeolite type A and zeolite type X crystal domains. In a preferred embodiment, calcium ions constitute a substantial number of the composite's exchangeable cations and the type X portion of the composite zeolite product has a silicon-to-aluminum atomic ratio in the range of 0.9 to less than 1.15. The nitrogen oxide- and hydrocarbon-selective adsorbent can be incorporated into an atmospheric air prepurification plant downstream of a water vapor-selective adsorbent and a carbon dioxide-selective adsorbent.

    摘要翻译: 通过使空气进行变温吸附方法,从空气中除去氮氧化物和低分子量烃,使用含有沸石A型和沸石型X的复合沸石产物作为吸附剂。复合沸石产物通过使钠离子 - 或含钠离子和钾离子的氧化铝 - 二氧化硅水凝胶在导致生成含有A型沸石和X型晶体结构域的沸石复合材料的条件下进行。 在优选的实施方案中,钙离子构成了大量的复合材料的可交换阳离子,并且复合沸石产品的X型部分的硅 - 铝原子比在0.9至小于1.15的范围内。 氮氧化物和烃选择性吸附剂可以并入到水蒸汽选择性吸附剂和二氧化碳选择性吸附剂下游的大气空气预纯化装置中。

    Thermal swing adsorption process
    6.
    发明授权
    Thermal swing adsorption process 失效
    热变形吸附过程

    公开(公告)号:US06432171B1

    公开(公告)日:2002-08-13

    申请号:US09648984

    申请日:2000-08-28

    IPC分类号: B01D5304

    摘要: The present invention provides for a thermal swing adsorption process for the removal of trace impurities such as oxides of nitrogen and hydrocarbons from air prior to its separation by cryogenic distillation. The process may utilize three adsorbent layers, the first primarily removes water; the second primarily removes carbon dioxide; and the third layer is a composite adsorbent layer which removes the oxides of nitrogen and hydrocarbons from the air stream. Another embodiment employs a two layer adsorbent system to remove the impurities. Additionally, a single layer of composite adsorbent may be used to remove water, carbon dioxide, oxides of nitrogen, and hydrocarbons from the air stream.

    摘要翻译: 本发明提供一种用于在通过低温蒸馏分离之前从空气中除去微量杂质如氮氧化物和烃的热变形吸附方法。 该方法可以使用三个吸附剂层,第一个主要是去除水; 第二个主要是去除二氧化碳; 并且第三层是从空气流中除去氮和碳氢化合物的复合吸附剂层。 另一个实施方案采用双层吸附剂系统来除去杂质。 此外,单层复合吸附剂可用于从空气流中除去水,二氧化碳,氮氧化物和碳氢化合物。

    Temperature swing adsorption process
    10.
    发明授权
    Temperature swing adsorption process 失效
    变温吸附过程

    公开(公告)号:US06409800B1

    公开(公告)日:2002-06-25

    申请号:US09648982

    申请日:2000-08-28

    IPC分类号: B01D5304

    摘要: Nitrogen oxides and low molecular weight hydrocarbons are removed from air by subjecting the air to a temperature swing adsorption process using as the adsorbent a composite zeolite product containing both zeolite A and zeolite X. The composite zeolite product is preferably prepared by forming a mixture of an agglomerate of silica and sodium zeolite X having a Si/Al atomic ratio in the range of about 0.9 to less than about 1.2 and a water-soluble sodium aluminate salt; maintaining the mixture at a temperature in the range of about 25 to about 100° C. for a period of time sufficient to convert at least 50% of the silica to sodium zeolite A; and at least partially exchanging the zeolite A-containing product with divalent cations, preferably calcium ions.

    摘要翻译: 通过使空气进行变温吸附方法从空气中除去氮氧化物和低分子量烃,使用含有沸石A和沸石X的复合沸石产物作为吸附剂。复合沸石产物优选通过形成 Si / Al原子比在约0.9至小于约1.2范围内的二氧化硅和钠沸石X的附聚物和水溶性铝酸钠盐; 将混合物保持在约25至约100℃范围内的温度下足以将至少50%的二氧化硅转化为沸石A的时间; 并且至少部分地将含沸石A的产物与二价阳离子,优选钙离子交换。