Chevron Phillips Chemical Company LP

Jennifer F Drew

Ralph W Romig

Timothy O Odi

Gregory G Hendrickson

Robert R McElvain

Lei Ji

Steven D Bridges

Christina M Barry

A closed-loop nitrogen transport system including 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.

Nitrogen conservation in polymerization processes

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.

A treater regeneration system in a polyolefin production system, the treater regeneration system comprising an off-line treater receiving a first portion of a regenerating stream and regenerating a desiccant in the off-line treater to yield a regenerating effluent stream, where the regenerating stream comprises a regenerating medium, and where the regenerating effluent stream comprises the regenerating medium, water and an impurity; a decanter receiving at least a portion of the regenerating effluent stream to yield the regenerating stream and a water stream, wherein the water stream comprises the water; and a stripper receiving a second portion of the regenerating stream to yield an impurity stream and a process recycle stream, wherein the impurity stream comprises at least a portion of the impurity, and wherein the process recycle stream comprises the regenerating medium of the second portion of the regenerating stream.

Treater regeneration

Disclosed are embodiments of a method of regenerating a desiccant in an off-line treater of a polyolefin production process. The method may include a heating phase followed by a cooling phase. The heating phase may involve use of a regenerating gas made from heating a treated a recycle stream of the polyolefin production process to regenerate desiccant in an off-line treater. The cooling phase may involve thermosyphoning the regenerating gas, nitrogen, an olefin-free diluent, or combinations thereof in a closed-convection loop of the off-line treater.

Described herein are processes and systems for purifying an olefin stream which has at least 99 mol % ethylene, involving use of a sulfur guard bed to yield an effluent from the olefin stream which is substantially free of sulfur; a hydrogenation catalyst to yield an effluent from the sulfur guard bed effluent which is substantially free of sulfur, oxygen, acetylene, methyl acetylene, and propadiene; a copper-metal containing catalyst bed to yield an effluent from the hydrogenation catalyst effluent which is substantially free of sulfur, oxygen, acetylene, methyl acetylene, propadiene, carbon monoxide, and hydrogen; and a desiccant to yield a purified ethylene stream having greater than or equal to 99.875 mol % ethylene.

Growing community of inventors

Humble, TX, United States of America

Jennifer F Drew