Process for purifying waste water
AssigneeHoechst Aktiengesellschaft
InventorsRainer Klein, Jurgen Helberg
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Abstract
Extraction waste water produced upon the polymerization of olefins, which contains titanium and aluminum compounds and which is adjusted to a pH varying from 4.5 to 9.5. Hereby titanium and aluminum hydroxides occur in an easily precipitating state.
Claims3
A process for the simultaneous precipitation and removal of aluminum and titanium from extraction waste water obtained by water-alcohol extraction and separation of aluminum titanium halide olefin polymerization catalyst from an olefin polymerization reaction carried out in an inert hydrocarbon solvent, said extraction water containing water soluble aluminum and titanium compounds, hydrogen halide acids or inorganic alkali bases, and alkali halides, said process consisting essentially of adjusting the pH of the waste water to a pH of from 5 to 9 by adding acid or base, at a temperature of 40.degree. to 80.degree. C, to precipitate said water soluble aluminum and titanium compounds as the corresponding hydroxides, settling the hydroxide precipitates, and separating said precipitated hydroxides from said waste water.
Dependencies are inferred from the claim text.