| 摘要 |
<p>The process comprises the following steps :… A - feeding the polymeric latexes containing 10 to 50% by weight of polymer, at a temperature of from 10 to 120 DEG C, through one or more feeding channels (2), to the narrow zone or to the divergent section of a nozzle (1) in which water vapour flows at sonic or supersonic speed respectively, according to vapour/latex feeding ratios of 0.1-2 Kg of vapour/Kg of latex, where the latex is subdivided by the water vapour into a dispersion of particles;… B - continuously feeding the dispersion obtained in step A) to a tube or an exchanger (4) of the type tube-in-tube directly connected with the divergent section of the nozzle where the dispersion, at a temperature of 100-150 DEG C for residence times of from 0.1 to 1 second, maintains a speed of 50-150 m/sec., so providing a dispersion of solid caked particles of polymer and of liquid particles in a vapour phase comprising the unreacted monomers and the water vapour, the vapour phase being separated from the dispersion by means of methods known in themselves.</p> |
