2.5: Separation by Diffusion Methods

2.5 Separation by Diffusion Methods

The plastic is precipitated from a solution or dispersion in a glass vessel as a thin film on the inner wall; meanwhile a solvent, which is a non-solvent towards the plastic, is added in several stages. The solvent must be able to dissolve the additives. Additives or a second plastic can be isolated in a short time by diffusion alone if the mixture is left to stand in the solvent, occasionally shaken and the solvent is renewed four to six times.

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