Exxonmobil Chemical Patents Inc.

Steven P Haynie

Diwaker Singh

Giyarpuram N Prasad

Gautam Swamynathan

Stacy N Apugo

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

A process, for recovery of unreacted olefin monomer(s) from a particulate product of an olefin polymerization reactor, the particulate polymer product is supplied to a degassing vessel, where the particulate product is countercurrently contacted with at least a first gaseous stripping stream, which includes at least 5% by weight unreacted olefin monomer, and then with an inert gas stream under conditions effective to strip hydrocarbon impurities from the polymer product and produce a stripped polymer product, is provided.

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Dayton, TX, United States of America

Steven P Haynie