Heavy hydrocarbon recovery from pressure swing adsorption unit tail gas

摘要: A pressure swing adsorption process for the separation of impurities such as nitrogen and carbon dioxide recovery hydrocarbons from a natural gas stream utilizes two separate systems, first (32) containing an adsorbent selective nitrogen, or both second (40) hydrocarbon-selective adsorbent. In process, is passed through to form product (34) enriched with methane adsorb and/or which further coadsorbs at least portion contained in feed stream. The are recovered by passing low waste (35) stage contains coadsorbed directing produce (42) dioxide. are., intermediate methane­containing (44) pressure:swing purges the.adsorbent forms combined comprising C.3 + hydrocarbons. C3+ can be separated compression flash refrigeration.