Patent ID: 9708418
Date: 2017-07-18
CPC Classifications: B01D,B01J,C08F

Claim:
1. A process for recycling solvent used in an ethylene-based polymerization comprising: providing a first regenerated purification bed comprising an adsorbent which, upon exposure to a chlorooctane and ethylene produces less than or equal to 650 mg ethylene dimer/(kg adsorbent* h); swapping said regenerated purification bed with a first online purification bed in an ethylene-based solvent polymerization system; thereby converting said regenerated purification bed into an alternative online purification bed in said ethylene-based solvent polymerization system and converting said online purification bed into an alternative regenerated purification bed; conveying a solvent stream comprising solvent, ethylene, hydrogen, polymerization by-products and optionally comonomer from a first ethylene-based solvent polymerization reactor to the alternative online purification; passing said solvent stream comprising solvent, ethylene, hydrogen, polymerization by-products and optionally comonomer through the alternative online purification bed to produce a recycled solvent stream comprising a recycled solvent; and passing the recycled solvent stream from the alternative online purification bed to a second ethylene-based solvent polymerization reactor; wherein the second ethylene-based solvent polymerization reactor polymerizes ethylene and optionally one or more α-olefins in the presence of said recycled solvent and exhibits a catalyst efficiency dip of less than or equal to 20% for no longer than a forty-eight hour period following said swap.