Process for the production of alkene polymers

Details Process for the production of alkene polymers Process for the production of alkene polymers

1994-04-22

1995-11-28

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing and recycling removed material from an ongoing...

526351, 526352, C08F 234

Patent

active

054709253

ABSTRACT:
An ethylene stream which contains ethane as an impurity or a propylene stream which contains propane as an impurity is contacted with a polymerization catalyst thereby producing a polymer product containing unreacted ethylene or propylene and the corresponding alkane. A gas mixture containing ethylene or propylene and the corresponding alkane is separated from the polymer product and subjected to adsorption at a temperature of 50.degree. to 200.degree. C. in a bed of adsorbent which selectively adsorbs alkenes, thereby adsorbing substantially all of the propylene or ethylene from the gas mixture. The ethylene or propylene is desorbed from the adsorbent and recycled to the polymerization zone. The process is operated on a low per pass conversion with recycle of unreacted monomer. In the system of the invention the adsorption unit may be upstream or downstream of the polymerization reactor.

REFERENCES:
patent: 4917711 (1990-04-01), Xie et al.
patent: 4935475 (1990-06-01), Kishimura et al.
Adsorptive Separation of Propylene--Propane Mixtures-Harri Jarvelin and James R. Fair.
Zeolite Molecular Sieves--Donald W. Breck--Union Carbide Corporation.
Union Carbide Molecular Sieves Hydrocarbon Materials Data Sheets (Propylene Adsorption, Hydrocarbon Adsorption, Propane Adsorption, Ethylene Adsorption, Ethane Adsorption, Vapor Adsorbate Equilibira Data, Capacity for Ethane-Ethlene Mitures).

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