Process for the polymerization and copolymerization of ethylene, using a gas injection device

摘要

Process and device for cooling a mixture of polymer and monomer from a reactor in which ethylene is polymerized or copolymerized at a pressure greater than 1,000 bars between a pressure-reduction valve located downstream of the reactor and a medium pressure separator. The cooling is achieved by injecting monomer at a pressure below that of the separator using a device with a nozzle cross-section S1 through which the mixture from the reactor passes, a convergent mixing zone in which the mixture is mixed with the monomer injected, which is supplied at a flow rate q, and a diffuser of throat cross-section S3, which makes it possible to bring the mixture to the pressure of the separator. The dimensions of the device are such that the ratio Q/S1 is between 0.20 and 1.35 t/hr.mm2 and the ratio (q+Q/S3 is between 0.1 and 0.3 t/hr.mm2.