LNG Pretreatment

摘要

A natural gas feedstream containing contaminants such as carbon dioxide is purified by passing the contaminated natural gas stream through a membrane to remove the bulk of the contaminant, passing the purified natural gas stream to a TSA unit to remove additional contaminant from the natural gas stream to a desired specification, and regenerating the TSA adsorbent by heating the adsorbent with a heated contaminant-containing permeate stream from the membrane.

主权项

1. A process for treating a natural gas feed stream containing a contaminant comprising:
a) passing said natural gas feed stream to a membrane unit to remove at least a portion of said contaminant from said natural gas feed stream as a permeate, and yield a partially purified natural gas stream as retenate; b) passing said partially purified natural gas retenate stream to a temperature swing adsorption unit containing an adsorbent to remove a further amount of said contaminant and produce a purified natural gas stream, having less contaminant than said retenate and; c) regenerating said TSA adsorption unit to desorb said contaminant from said adsorbent within said TSA unit by heating said permeate and using said heated permeate stream to heat said adsorbent.