Reducing catalyst precipitation during polymer isolation
Abstract
Abstract A PROCESS FOR PREPARING AN ELASTOMERIC POLYOLEFIN IN A SOLVENT SOLUTION, IN THE PRESENCE OF A COORDINATION-TYPE CATALYST HAVING A TRANSITION METAL COMPONENT, WHEREIN THE POLYOLEFIN IS ISOLATED BY (A) MIXING THE POLYOLEFIN SOLUTION WITH STEAM OR WATER TO DEACTIVATE THE CATALYST, AND FORM AND AQUEOUS PHASE IN THE POLYOLEFIN SOLUTION; (B) SEPARATING THE AQUEOUS PHASE FROM THE POLYOLEFIN SOLUTION; AND (C) SEPARATING THE POLYOLEFIN FROM THE SOLVENT; THE PRECIPITATION OF CATALYST RESIDUE IS PRACTICALLY ELIMINATED BY ADDING TO THE MIXTURE OF THE POLYOLEFIN SOLUTION AND THE AQUEOUS PHASE 5-200 MOLE PERCENT OF A SALT OF AN OXYACID OF SULFUR FROM THE GROUP OF BISULFITES, BISULFATES, OR PERSULFATES BASED ON THE MOLES OF TRANSITION METAL COMPONENT OF THE CATALYST.
Inventors
- 👤 Andrew Tze-Chiu Liu
Bibliographic Details
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