Method of manufacture of molecular sieves
    3.
    发明授权
    Method of manufacture of molecular sieves 失效
    分子筛的制造方法

    公开(公告)号:US5916836A

    公开(公告)日:1999-06-29

    申请号:US834672

    申请日:1997-04-01

    CPC分类号: C01B39/026

    摘要: Zeolites exchanged with lithium ions and, optionally, with polyvalent cations are prepared by ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with ammonium ions, thereby replacing the sodium and/or potassium ions with ammonium ions, and then reacting the ammonium ion-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone. Polyvalent ions, which may be present in the zeolite undergoing ion-exchange, will not be substantially replaced by the ammonium or lithium ions.

    摘要翻译: 与锂离子交换的沸石和任选地与多价阳离子交换的沸石通过用铵离子将含钠沸石,含钾沸石或含钠和钾的沸石离子交换来制备,从而将钠和/或钾 离子与铵离子反应,然后使铵离子交换的沸石与水溶性锂化合物在导致从反应区除去氨的条件下反应。 可能存在于进行离子交换的沸石中的多价离子基本上不会被铵或锂离子所取代。

    Synthesis of low silicon sodium X zeolite
    6.
    发明授权
    Synthesis of low silicon sodium X zeolite 失效
    低硅钠X沸石的合成

    公开(公告)号:US06596256B1

    公开(公告)日:2003-07-22

    申请号:US09648798

    申请日:2000-08-28

    IPC分类号: C01B3922

    摘要: Low silicon sodium X zeolite containing little or no sodium A zeolite as by-product, is prepared by direct synthesis from sodium ion-containing hydrogels, the crystallization step being carried out by maintaining the hydrogels at a temperature below about 70° C., and preferably in the range of about 50 to about 70° C. for the duration of the crystallization step. Preferably, the ratios of components in the solutions used to make the hydrogel are such that in the hydrogel the silica/alumina molar ratio will be in the range of about 2.25:1 to about 2.4:1; the sodium oxide to silica molar ratio will be in the range 1.6:1 to about 1.9:1; and the water to sodium oxide molar ratio will be greater than about 60:1.

    摘要翻译: 通过从含钠离子的水凝胶直接合成制备含有很少或不含有钠A沸石的低硅钠X沸石,结晶步骤通过将水凝胶保持在低于约70℃的温度下进行,和 优选在约50至约70℃的范围内,在结晶步骤的持续时间内。 优选地,用于制备水凝胶的溶液中组分的比例使得在水凝胶中二氧化硅/氧化铝的摩尔比将在约2.25:1至约2.4:1的范围内; 氧化钠与二氧化硅的摩尔比将在1.6:1至约1.9:1的范围内; 并且水与氧化钠的摩尔比将大于约60:1。