发明名称 |
Temperature swing adsorption process |
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.
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申请公布号 |
US6416569(B1) |
申请公布日期 |
2002.07.09 |
申请号 |
US20000648802 |
申请日期 |
2000.08.28 |
申请人 |
THE BOC GROUP, INC.;CHEMIEWERK BAD KOESTRITZ GMBH |
发明人 |
BUELOW MARTIN;OJO ADEOLA F.;FITCH FRANK R.;UNGER BALDUR;BRANDT ALFONS |
分类号 |
A61L9/01;B01D53/02;B01J20/18;B01J20/30;C01B39/02;C01B39/22;(IPC1-7):B01D53/04;B01D53/26 |
主分类号 |
A61L9/01 |
代理机构 |
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代理人 |
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