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    • 3. 发明授权
    • PSA process for recovery or ethylene
    • PSA回收过程或乙烯
    • US5245099A
    • 1993-09-14
    • US918480
    • 1992-07-22
    • Michael J. Mitariten
    • Michael J. Mitariten
    • C10G55/04C10G70/04
    • C10G70/046C10G55/04Y02P30/464
    • A process is provided for the concentration and recovery of ethylene and heavier components from a hydrocarbon feedstream. A pressure swing adsorption (PSA) process is used to remove from hydrocarbon feedstream light cut comprising hydrogen, carbon monoxide, and methane and subsequently concentrate a heavy cut comprising the ethylene and heavy components in the PSA tail gas. In one aspect of the invention, an FCC off gas is separated into a light cut and a heavy cut and the heavy cut is routed to an ethylene plant. In another aspect of the invention, a C.sub.2 -rich stream is withdrawn from an ethylene plant and used to enhance the recovery of the ethylene and heavier stream in the PSA process and an ethylene-rich stream is returned to the ethylene plant.
    • 提供了一种从烃进料流中浓缩和回收乙烯和较重组分的方法。 使用变压吸附(PSA)方法从包含氢气,一氧化碳和甲烷的轻烃进料流中除去,随后将包含乙烯和重组分的重馏分浓缩在PSA尾气中。 在本发明的一个方面,FCC废气被分离成轻馏分和重馏分,重馏分被引导到乙烯装置。 在本发明的另一方面,从乙烯装置中取出富含C2的料流并用于增强PSA方法中乙烯和较重物流的回收,并且将富含乙烯的料流返回至乙烯装置。
    • 4. 发明授权
    • Heavy hydrocarbon recovery from pressure swing adsorption unit tail gas
    • 重烃从变压吸附装置尾气中回收
    • US06610124B1
    • 2003-08-26
    • US10094716
    • 2002-03-12
    • William Bachop DolanMichael J. Mitariten
    • William Bachop DolanMichael J. Mitariten
    • B01D53047
    • B01D53/02B01D53/0446B01D53/047B01D2253/102B01D2253/104B01D2253/106B01D2253/308B01D2256/24B01D2257/102B01D2257/504B01D2259/40001B01D2259/40052C07C7/12C10L3/10C10L3/102Y02C10/08Y02P20/152
    • A pressure swing adsorption process for the separation of impurities such as nitrogen and carbon dioxide and recovery of hydrocarbons from a natural gas stream utilizes two separate adsorption systems, the first containing an adsorbent selective for nitrogen, carbon dioxide or both and the second containing a hydrocarbon-selective adsorbent. In the process, the natural gas stream is passed through a first adsorbent to form a product stream enriched with methane and to adsorb nitrogen and/or carbon dioxide and which further co-adsorbs at least a portion of the hydrocarbons contained in the feed stream. The hydrocarbons are recovered by passing a low pressure waste stream from the first pressure swing adsorption stage which contains co-adsorbed nitrogen and/or carbon dioxide and hydrocarbons and directing the waste stream to the second pressure swing adsorption stage to adsorb the hydrocarbons and produce a product stream enriched in nitrogen and/or carbon dioxide. The hydrocarbons are recovered from the hydrocarbon-selective adsorbent by an intermediate pressure methane-containing stream from the first pressure swing adsorption stage which purges the adsorbent in the second stage and forms a combined stream comprising methane and C3+ hydrocarbons. The C3+ hydrocarbons can be separated from the methane such as by compression with flash separation or refrigeration.
    • 用于分离杂质如氮气和二氧化碳并从天然气流中回收碳氢化合物的变压吸附方法使用两个单独的吸附系统,第一个吸附系统包含对氮气,二氧化碳或二者均有选择性的吸附剂,第二个包含烃 选择性吸附剂。 在该过程中,天然气流通过第一吸附剂以形成富含甲烷的产物流并吸附氮和/或二氧化碳,并进一步共吸附进料流中所含烃的至少一部分。 通过从含有共吸附的氮和/或二氧化碳和烃的第一变压吸附阶段通过低压废物流并将废物流引导到第二变压吸附阶段以吸附烃并产生 富含氮和/或二氧化碳的产物流。 通过来自第一变压吸附阶段的中压含甲烷流从烃选择性吸附剂回收烃,其在第二阶段中清洗吸附剂并形成包含甲烷和C3 +烃的组合流。 可以将C3 +烃与甲烷分离,例如通过用闪蒸分离或制冷进行压缩。