| 摘要 |
<p>Continuous process for preparing a halogenated polymer comprising a step of polymerization of at least one halogenated monomer in a medium comprising carbon dioxide in the liquid or supercritical state (L/SC-CO2), in at least one pressurized reactor, said process comprising at least: - (1) an expansion of the suspension resulting from the reactor; - (2) a separation of the expanded suspension resulting from the reactor into a first stream, containing the solid phase comprising the halogenated polymer and into a liquid, gaseous or supercritical second stream, which is a mixture of CO2 and of monomer not converted to polymer; and the recovery of this first stream and of this second stream; - (3) an optional reheating, applied to the expanded suspension, before or after its separation into first and second streams, with optional recovery of the cold energy generated by the expansion; - (4) a recompression of the second stream and the optional cooling thereof in order to recycle it to the reactor feed, with a fresh monomer make-up and, possibly, a CO2 make-up; - a final step (5) of degassing the halogenated polymer, combined with a continuous technique of forming the polymer into granules. Device for implementing the process.</p> |
