Nitrogen Conservation in Polymerization Processes
AssigneeChevron Phillips Chemical Company LP
InventorsLei Ji, Gregory G. Hendrickson, Robert R. McElvain, Steven D. Bridges, Jennifer F. Drew
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Abstract
A system for recovering nitrogen during regeneration of a treater, the system including an adsorbent bed downstream of the treater, wherein the adsorbent bed comprises an adsorbent operable to adsorb at least one impurity from a treater bed regeneration effluent stream comprising nitrogen to provide a nitrogen product having a higher nitrogen purity than a nitrogen purity of the treater bed regeneration effluent stream. A method for recovering nitrogen during regeneration of a treater is also provided.
Claims20
A system for recovering nitrogen during regeneration of a treater, the system comprising:
- an adsorbent bed downstream of the treater, wherein the adsorbent bed comprises an adsorbent operable to adsorb at least one impurity from a treater bed regeneration effluent stream comprising nitrogen to provide a nitrogen product having a higher nitrogen purity than a nitrogen purity of the treater bed regeneration effluent stream.
A method for recovering nitrogen during regeneration of a treater bed, the method comprising:
- introducing a treater bed regeneration effluent stream comprising nitrogen and at least one impurity into an adsorbent bed, wherein the adsorbent bed comprises an adsorbent operable to adsorb the at least one impurity from the treater bed regeneration effluent stream to provide a nitrogen product having a higher nitrogen purity than a nitrogen purity of the treater bed regeneration effluent stream.
A closed-loop nitrogen transport system comprising:
- a first transfer line configured for nitrogen pressure conveyance of a polymer fluff from at least one upstream vessel to at least one downstream vessel;
- a second transfer line configured to return a nitrogen gas stream comprising primarily nitrogen from the at least one downstream vessel to the at least one upstream vessel;
- a conveyor blower operable to provide flow throughout the closed loop;
- and
- a treatment unit operable to remove hydrocarbons from at least a portion of the nitrogen gas stream comprising primarily nitrogen, to provide a purified nitrogen stream.
A closed-loop nitrogen transport process comprising:
- conveying, with nitrogen gas, a polymer fluff from at least one upstream vessel to at least one downstream vessel via a first transfer line;
- utilizing a conveyor blower to return a nitrogen gas stream comprising primarily nitrogen from the at least one downstream vessel to the at least one upstream vessel via a second transfer line;
- introducing at least a portion of the nitrogen gas stream comprising primarily nitrogen into a treatment unit operable to remove hydrocarbons therefrom and provide a purified nitrogen stream;
- and
- introducing at least a portion of the purified nitrogen stream into the at least upstream vessel, the first transfer line, the second transfer line, or a combination thereof, whereby a concentration of hydrocarbons in the nitrogen gas stream comprising primarily nitrogen is maintained at a desired level.
Dependencies are inferred from the claim text.