초록 ▼

A pressure swing adsorption process is provided for the separation of a feedstream containing less readily, intermediately readily, and more readily adsorbable components using first and second adsorption zones. The second adsorption zone utilizes a cycle that includes a cocurrent displacement step

A pressure swing adsorption process is provided for the separation of a feedstream containing less readily, intermediately readily, and more readily adsorbable components using first and second adsorption zones. The second adsorption zone utilizes a cycle that includes a cocurrent displacement step and the intermediately adsorbable components are recovered therefrom by countercurrent depressurization. The first adsorption zone is purged with a stream from the second adsorption zone to recover the more readily adsorbable component. In one aspect of the invention, there is provided a methanol reforming process wherein hydrogen and carbon monoxide product streams are recovered from a methanol reactor effluent stream also containing components selected from methanol, methane, dimethyl ether, carbon dioxide, oxygen and water.

대표청구항 ▼

A pressure swing adsorption process for the separation of a feedstream containing a less readily adsorbable component, an intermediately adsorbable component and at least one more readily adsorbable component, with recovery of the intermediately adsorbable component as a desired product, in an integ

A pressure swing adsorption process for the separation of a feedstream containing a less readily adsorbable component, an intermediately adsorbable component and at least one more readily adsorbable component, with recovery of the intermediately adsorbable component as a desired product, in an integrated adsorption system having first and second adsorption zones arranged in series, said process comprising; (a) passing the feedstream to the first adsorption zone at a first zone adsorption pressure in which the at least one more readily adsorbable component is adsorbed, and recovering a first zone adsorption effluent stream depleted in the at least one more readily adsorbable component relative to the feedstream; (b) passing the first zone adsorption effluent stream to the second adsorption zone maintained at a second zone adsorption pressure in which the intermediately adsorbable component is adsorbed, and recovering a second zone adsorption effluent stream depleted in the intermediately readily adsorbable component relative to the feedstream; (c) cocurrently displacing the less readily adsorbable component contained within said second adsorption zone with a displacement gas having a concentration of the intermediately adsorbable component which is higher than that of the feedstream and recovering a displacement effluent stream comprising the less readily adsorbable component; (d) countercurrently depressurizing the first adsorption zone to a first zone desorption pressure that is at or above atmospheric pressure and recovering a first zone desorption effluent stream enriched in the at least one more readily adsorbable component relative to the feedstream; (e) countercurrently purging the first adsorption zone with a purge gas comprising at least a portion of an effluent stream from the second adsorption zone that is rich in the less readily adsorbable component and recovering a first zone purge effluent stream enriched in the at least one more readily adsorbable component relative to the feedstream; (f) countercurrently depressurizing the second adsorption zone to a second zone desorption pressure that is at or above atmospheric pressure and recovering a second zone desorption effluent stream enriched in the intermediately adsorbable component relative to the feedstream; and (g) repressurizing the first and second adsorption zones.