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    • 4. 发明公开
    • Method of recovering a light element from a dilute feed
    • Verfahren zurZurückgewinnungeines leichten Elementes aus einemverdünntenRohgas。
    • EP0684066A2
    • 1995-11-29
    • EP95302293.6
    • 1995-04-06
    • THE BOC GROUP, INC.
    • Kapoor, AkhileshKrishnamurthy, Ramachandran
    • B01D53/22B01D53/047C01B3/50C01B23/00
    • C01B23/0094B01D53/047B01D53/229B01D2253/108B01D2256/16B01D2256/18B01D2257/102B01D2257/504B01D2257/7022B01D2257/80B01D2258/06B01D2259/416C01B3/501C01B3/56C01B2203/0405C01B2203/043C01B2203/0465C01B2203/047C01B2203/0475C01B2203/048C01B2203/0495C01B2210/0012C01B2210/0014C01B2210/0031C10L3/101C10L2290/06C10L2290/10C10L2290/46C10L2290/542C10L2290/548Y02C10/08Y02C10/10Y02P20/152
    • A method of recovering a light element comprising hydrogen or helium from a high pressure feed stream. The feed stream comprises the light element in a concentration of less than 30% by volume and also, hydrocarbons and trace heavy contaminants. Methane and nitrogen may be in the high pressure feed stream if derived from a natural gas source. The trace heavy contaminants are removed from the high pressure feed stream through absorption in one or more beds of activated carbon and the feed stream, still at high pressure, is passed through a membrane unit having a membrane design to allow permeation of the light element while rejection of the hydrocarbons, possibly methane, and nitrogen. The membrane unit produces a process stream enriched to somewhere above 40% in the light elements and a mass flow rate that is only a fraction of the mass flow rate of the feed stream. The process stream is then compressed and subjected to a pressure swing adsorption process utilizing one or more adsorbents to least absorb the hydrocarbons to produce a product stream highly enriched in the light element or 98% enriched and above. Since the mass flow rate of the process stream is very low, very little energy need be expended in compressing the process stream as compared with prior art processes using cryogenic rectification. Additionally, since the waste stream is rejected at pressure, if the pressure is high enough, it can simply be returned to a source of the feed stream without recompression or if not being supplied at a requisite high pressure, it can be recompressed with a blower and then returned to the supply.
    • 从高压进料流中回收包含氢或氦的轻元素的方法。 进料流包含浓度小于30体积%的轻质元素,以及烃和痕量重的污染物。 如果源自天然气源,甲烷和氮气可能在高压进料流中。 通过在一个或多个活性炭床中的吸收从高压进料流中除去痕量重的污染物,并且仍然在高压下的进料流通过具有膜设计的膜单元以允许轻元素的渗透同时 排除烃,可能是甲烷和氮气。 膜单元产生在轻元素中富集到40%以上的工艺流,并且质量流量仅为进料流质量流量的一部分。 然后将工艺流压缩并进行利用一种或多种吸附剂的变压吸附方法以最少吸收烃以产生高度富集在轻元素中的产物流或富含98%以上的产物流。 由于工艺流的质量流速非常低,与使用低温精馏的现有技术方法相比,在压缩流程中需要很少的能量消耗。 此外,由于废物流在压力下被排出,如果压力足够高,则可以简单地将其返回到进料流源而不进行再压缩,或者如果在必要的高压下不被供给,则可以用鼓风机 然后回到供应。