Exxonmobil Chemical Patents Inc.

Giyarpuram N Prasad

David Jack Sandell

Diwaker Singh

Steven P Haynie

Stacy N Apugo

Jason R Fischer

Gautam Swamynathan

A polymerization process may include: polymerizing a monomer having 4 or less carbons and a comonomer having 6 or more carbons in the presence of an inert isomer/saturate of the comonomer to yield a product stream comprising a polymer, unreacted monomer, unreacted comonomer, and the inert isomer/saturate of the comonomer; separating the product stream into (a) a polymer stream and (b) an unreacted components stream; and separating the unreacted components stream in a distillation column into (a) an overhead stream comprising the unreacted monomer and (b) a bottoms stream comprising the comonomer and the inert isomer/saturate of the comonomer, wherein a concentration of C5&#x2212; hydrocarbons in the overhead stream is higher than a concentration of the C5&#x2212; hydrocarbons in the unreacted components stream, and wherein a concentration of C6+ hydrocarbons in the bottoms stream is higher than a concentration of the C6+ hydrocarbons in the unreacted components stream.

Reducing accumulation of C6+ hydrocarbon components in polyolefin gas-phase reactors

In a process for producing an olefin polymer, an olefin monomer is polymerized to produce a particulate polymer product containing unreacted monomer. The polymer product is contacted with an inert gas to strip hydrocarbon impurities therefrom and produce a stripped polymer product and a gaseous first effluent stream containing inert gas and hydrocarbons. The stripped polymer product is recovered and the first effluent stream is compressed and cooled to condense hydrocarbons contained therein and produce a gaseous second effluent stream. Part of the second effluent stream is contacted with a first membrane separator to produce a first hydrocarbon-enriched permeate stream and a first hydrocarbon-depleted residue stream. The first residue stream is contacted with a second membrane separator to produce a second hydrocarbon-enriched permeate stream and a second hydrocarbon-depleted residue stream. The second permeate stream and an oxidizing agent are supplied to a flameless thermal oxidation unit.

Olefin polymerization processes

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Houston, TX, United States of America

Giyarpuram N Prasad