Patent EP0530159A2 successfully refreshed from Google Patents.
US4052301A
Expired / Lapsed
US
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Process for purifying waste water
Assignee: Hoechst AG
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Filing: 1975-07-15
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Granted: 1977-10-04
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Expires: 1995-07-15
Abstract
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.
Inventors
- 👤 Rainer Klein
- 👤 Jurgen Helberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F2101/00; C02F2101/10; C02F2101/20; C02F2103/00; C02F2103/34; C02F2103/36; C02F2103/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
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° to 80° 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.
Claim 2
Dependent Claim
120 words
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° to 80° 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.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the pH is adjusted with a base selected from the group consisting of alkali metal and alkali metal earth hydroxides, ammonium hydroxide and ammonium salts which on hydrolysis produce a base.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein the pH is adjusted with an acid selected from the group consisting of hydrochloric acid, sulfuric acid and acid salts which on hydrolysis produce an acid.
References Cited (Backward Citations)
DE84354C
Cited
SU319555A1
Cited
SU302315A1
Cited
US2204812A
Cited
US3523825A
Cited
US3536617A
Cited
US3798160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |