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US 5,229,486 AGranted
Process for isolating polymers from their solvents using liquids containing carbon dioxide
AssigneeBayer Aktiengesellschaft
InventorsHanns-Ingolf Paul, Rolf Treckmann, Gunther Weymans, Jurgen Kirsch, Jurgen Heuser, Klaus Elgeti
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Abstract
A process for isolating polymers from their solvents by addition of fluids containing carbon dioxide at temperatures of 30.degree. to 280.degree. C. and under pressures of 1 to 1,000 bar is disclosed. The process is characterized in that the concentration of the polymers in their solvents is between 5% and 80% by weight and the fluid containing carbon dioxide consists of at least 50% by weight carbon dioxide.
Claims7
A process for isolating a polymer from a solution containing a polymer and its solvent comprising
- (i) mixing into said solution a fluid containing carbon dioxide at temperatures between 30.degree. and 100.degree. C. and under pressures of 1 to 1,000 bar, causing precipitation of said polymer, and
- (ii) collecting said polymer, and
- (iii) granulating said polymer,
- said solution containing said polymer at an amount of 5 to 80% by weight, said fluid containing at least 50% by weight carbon dioxide.
1 more element
Dependencies are inferred from the claim text.