| 摘要 |
Polymers of a mono-olefine dissolved in a non-polar solvent are purified by emulsifying in the solution a small amount of a polar liquid immiscible with the solution to form a discontinuous phase, and subjecting the emulsion to the action of an electric field so that a substantial proportion of the impurities migrate to the polar liquid and the polar liquid droplets coalesce to a second continuous phase, and separating the second continuous phase and impurities from the polymer solution. The "polar liquid" may be water, glycerol or ethylene glycol. The "non-polar" solvent is preferably a C3 to C12 hydrocarbon. The olefine may be ethylene, propylene, butene-1, 3-methyl butene-1, pentene-1, or 4-methyl pentene-1. In the example the impurities removed arise from a chromium oxide catalyst supported on a carrier consisting of silica and alumina. |
