Concentration by uf of hazardous effluents extracted into emulsions from water solutions; examples with aniline and azobenzene
✍ Scribed by Marianne Nyström
- Book ID
- 103059351
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 607 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
Effluent waters containing very small concentrations of hazardous small organic molecules can be very difficult to clean by conventional methods without large process costs. In the reported study concentration experiments with aniline and azobenzene were carried out by extraction of the organic molecules into the oil phase of an o/w emulsion from a water phase and a simultaneous ultrafiltration of the emulsion. Distilled tall oil was used as the emulsifier and as the oil phase a commercial "petrol" fraction was used. The emulsions could be broken either by the addition of salt or by lowering of the pH.
The aniline experiments were carried out with an emulsion contammg limiting amounts of emulsifier. Aniline was concentrated somewhat better than predicted from its distribution coefficient value.
The azobenzene experiments were carried out with an emulsion containing more than sufficient emulsifier. Even when the emulsion contained 0.3 wt-% azobenzene no traces of it could be detected in the permeates.