Process for reducing transient operation time in polymerization reactors
    4.
    发明授权
    Process for reducing transient operation time in polymerization reactors 有权
    降低聚合反应堆瞬时运行时间的方法

    公开(公告)号:US06288178B1

    公开(公告)日:2001-09-11

    申请号:US09455182

    申请日:1999-12-06

    CPC classification number: B01D53/22 C01B3/501 C01B2203/0405 C01B2203/048

    Abstract: In the operation of a gas phase polymerization reactor, a significant amount of production time and material can be lost during the transition from initial process conditions for the production of one product to the desired process conditions for the production of a second product. The present invention recognizes the synergy between the use of a membrane separation zone selective for the removal of hydrogen from the reactor effluent and the operation of the polymerization reactor during the transition period to significantly reduce the transition time and substantially reduce the production of off-specification product during the transition period.

    Abstract translation: 在气相聚合反应器的操作中,在从用于生产一种产品的初始工艺条件到用于生产第二种产品的所需工艺条件的过渡期间,可能会损失大量的生产时间和材料。 本发明认识到使用选择性地从反应器流出物除去氢气的膜分离区与过渡期间聚合反应器的操作之间的协同作用,以显着减少过渡时间并显着减少脱离规格的生产 产品在过渡期间。

    Process for preparing molecular sieves via continuous addition of nutrients
    8.
    发明授权
    Process for preparing molecular sieves via continuous addition of nutrients 有权
    通过连续添加营养素制备分子筛的方法

    公开(公告)号:US07112316B1

    公开(公告)日:2006-09-26

    申请号:US11199044

    申请日:2005-08-08

    CPC classification number: C01B39/48 C01B39/04 C01B39/54 Y10S423/30

    Abstract: A process for synthesizing a variety of molecular sieves has been developed. The process involves forming a reaction mixture comprising reactive sources of the framework elements plus at least one templating agent, reacting the mixture to at least partially crystallize the molecular sieve and provide a slurry of seed crystals and adding to it nutrients (sources) of the framework elements, e.g. aluminum and silicon in order to grow the seed crystals. The rate of addition of the nutrients is controlled such that it is substantially the same as the crystal growth rate and such that there is substantially no nucleation of new crystals. The seed crystals may be the same or different than the nutrients being added, thus allowing for a layered molecular sieve. When the crystals have reached a desired size, they are isolated by conventional techniques.

    Abstract translation: 已经开发了合成各种分子筛的方法。 该方法包括形成包含框架元件的反应性源加上至少一种模板剂的反应混合物,使混合物反应至少部分地使分子筛结晶并提供晶种的浆料并向其中添加骨架的营养物(来源) 元素,例如 铝和硅,以生长晶种。 控制营养素的添加速度,使其与晶体生长速度基本相同,并且基本上不存在新晶体的成核。 晶种可以与添加的营养物相同或不同,从而允许层状分子筛。 当晶体达到所需尺寸时,它们通过常规技术分离。

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