Residual monomer separation from vinyl! chloride (co)polymer - by polymer powder sepn. from drying air-stream and turbulent bed treatment

摘要

In residual monomer sepn. from vinyl chloride polymers prepd. in aq. dispersion, most of the residual monomers are sepd. and part of the water is opt. dried in a warm air stream, following which gas and solid particles are sepd. and treated with gas in a turbulent bed. Novelty consists in effecting (a) polymer powder sepn. from the air-stream used in drying and (b) turbulent bed treatment together in the same separator compartment. The air quantity used for causing turbulence is 1/5 to 1/100 of the air quantity used for drying. Residual monomer content can be reduced to 10 ppm with low energy consumption.