초록 ▼

The present invention provides for a thermal swing adsorption process for the removal of trace impurities such as oxides of nitrogen and hydrocarbons from air prior to its separation by cryogenic distillation. The process may utilize three adsorbent layers, the first primarily removes water; the sec

The present invention provides for a thermal swing adsorption process for the removal of trace impurities such as oxides of nitrogen and hydrocarbons from air prior to its separation by cryogenic distillation. The process may utilize three adsorbent layers, the first primarily removes water; the second primarily removes carbon dioxide; and the third layer is a composite adsorbent layer which removes the oxides of nitrogen and hydrocarbons from the air stream. Another embodiment employs a two layer adsorbent system to remove the impurities. Additionally, a single layer of composite adsorbent may be used to remove water, carbon dioxide, oxides of nitrogen, and hydrocarbons from the air stream.

대표청구항 ▼

1. A process for the removal of impurities from a gas stream by thermal swing adsorption comprising sequentially passing said gas stream through a first adsorbent layer which will substantially remove water from said gas stream, a second adsorbent layer comprising a NaX, NaMSX or NaLSX zeolite which

1. A process for the removal of impurities from a gas stream by thermal swing adsorption comprising sequentially passing said gas stream through a first adsorbent layer which will substantially remove water from said gas stream, a second adsorbent layer comprising a NaX, NaMSX or NaLSX zeolite which will substantially remove CO2 from said gas stream, and a third adsorbent layer comprising a composite adsorbent which comprises a hydrocarbon removal adsorbent and an adsorbent to remove oxides of nitrogen.