Apparatus and method for stripping styrene from an aqueous dispe

Concentrating evaporators – Spray type – Gaseous current

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Details

159D10, 159 4B, 159 6R, B01D 116, B01D 122

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active

039309312

ABSTRACT:
An apparatus and method are disclosed for removing unreacted monomer and other volatile material from an aqueous dispersion of polymeric substance. An aqueous dispersion containing volatile material to be stripped is injected into a substantially unrestricted contacting tube along with a stripping gas such as steam to provide within the contacting tube a high velocity vaporous mixture of aqueous dispersion and stripping gas. The vaporous mixture is maintained under a pressure above atmospheric and preferably greater than 5 psi gauge within the contacting tube a time sufficient to permit absorption of volatiles from the dispersion to the stripping gas and preferably to permit saturation equilibrium to be approached. The vaporous mixture is discharged from the contacting tube through a nozzle into a substantially unrestricted post-contacting tube, which is maintained below atmospheric pressure, and preferably is impinged against a baffle means. Thereafter, the vaporous mixture is discharged from the post-contacting tube into a separator chamber that is maintained at a sufficient pressure below atmospheric to flash volatiles from the mixture. The volatiles and stripping gas are then removed from the separator chamber separate from the stripped aqueous dispersion. The stripping may be thereupon repeated to further reduce the residual volatiles within the aqueous dispersion.

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