| 摘要 |
<p>In a process for withdrawing polymerization heat in continuous olefin polymerization processes in which gaseous olefins are used, which comprises supplying gaseous olefin reactant, with or without an additional non-polymerizable gaseous component under a pressure substantially higher than the pressure that prevails in the reactor, and expanding said compressed olefin (or olefin and said additional non-polymerizable component) through a throttle valve into the reactor, the reactor being arranged in a circulatory path for said olefin, whereby heat of polymerization is withdrawn by heat exchange after the olefin has left the reactor and before it is again supplied through said valve into the reactor, according to the parent Specification, the olefin is introduced into the reaction space immediately after pressure release in the form of directed jets continuously moving in the reaction space while the layer of polymer arising in powder form is simultaneously agitated by mechanical means. Apparatus suitable for carrying out the process of the invention is described and illustrated and may comprise a rotating stirrer and rotating nozzle heads secured to a common shaft the hollow base of which running in a hollow bearing provides a passage for supplying the monomer. Catalyst may be added either continuously or incrementally, and the product may be recovered by passing the material withdrawn from the reactor through a cyclone separator. The polymerization of ethylene is described in an example.</p> |
