Reducing peak compositions in regeneration gas for swing adsorption processes
AssigneeUop LLC
InventorShain-Jer Doong
Life of this patent
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Abstract
This invention provides a method to smooth out the concentration peak generated from the regeneration stream of a cyclic adsorption process such as PTSA or TSA process. A fixed-bed adsorber (called a capacitor) to process the spent regeneration gas from a TPSA or TSA unit to maintain a constant composition of the spent regeneration gas to the downstream unit. The adsorber operates in a once-through non-cyclic manner, very similar to the conventional fixed bed reactor or adsorber. The spent regeneration gas stream coming out of the adsorber will have a more uniform CO2 composition than without the capacitor.
Claims11
A process for reducing peak levels of impurities in an adsorption bed regeneration gas stream comprising:
- sending a gas stream through a first adsorption bed to remove water, heavy hydrocarbons, and aromatic compounds to produce a partially purified gas stream;
- then sending said partially purified gas stream through an adsorption bed to remove carbon dioxide and C7− hydrocarbons wherein said carbon dioxide and C7− are a fuel gas stream;
- and
- then sending a portion of said fuel gas stream through a capacitor to reduce a peak level of said carbon dioxide, wherein said capacitor is operated at about 100 to 180° C.
Dependencies are inferred from the claim text.