Dynamic Recovery of Palladium Particles Dispersed in a Polymer-Containing Acetone Solution by Precipitation of 2-(Dimethylamino)ethyl Methacrylate and Styrene Copolymers

摘要

To recovery Pd particles in viscous acetone solution including nitrile butadiene rubber, the solution of water-soluble polymer, poly(styrene-2-(dimethylamino)ethyl methacrylate) (poly(styrene-DMAEMA)) were added, understanding especially the effect of copolymerization of styrene as well as fluid behavior in aim of applying to scale-up reactor. The added polymer was dehydrated, after which a poly(styrene-DMAEMA) precipitate containing Pd particles was obtained. By increasing the copolymerization percentage of styrene, the recovery percentage of the Pd particle varied dynamically from 60 to 80% due to the high affinity of the polymer to the Pd particle, high dehydration speed, dissolution speed of poly(styrene-DMAEMA), and size of the precipitate. In the scale-up batch mode, prolonged stirring corresponds to a high recovery percentage and mass transfer coefficient of the Pd particle. The optimum copolymerization percentage of styrene required to achieve the high recovery percentage and mass transfer coefficient in scale-up batch mode was determined to be 9%.