| 摘要 |
<p>Process for preparing a halogenated polymer and device for the implementation thereof 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) a reheating, applied to the expanded suspension, before or after its separation into first and second streams, combined with a 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; -(5) a final step of degassing the halogenated polymer, optionally in combination with a continuous technique of forming the polymer into granules. Device for implementing the process.</p> |
