Method for high temperature phase separation of solutions containing polymers

摘要

A process is disclosed for recovering polymer from a solution of the polymer in a solvent by high temperature phase separation in which low molecular weight hydrocarbon is added to the solution, the solution and the added hydrocarbon are subjected to a temperature and pressure so that one liquid phase is formed and the pressure is adjusted to form two phases, namely, a polymer-lean liquid phase and a polymer-rich liquid phase. The polymer-rich liquid phase is separated from the polymer-lean liquid phase, and the polymer is then recovered from the polymer-rich liquid phase.