US4837002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of chlorate from caustic soda
Assignee: BASF SE
•
Filing: 1988-02-22
•
Granted: 1989-06-06
•
Expires: 2008-02-22
Abstract
Abstract Chlorate is removed from aqueous caustic soda by reducing with iron pentacarbonyl and separating off the resulting iron oxide containing precipitate.
Inventors
- 👤 Dieter Schlaefer
- 👤 Wolfgang Kochanek
- 👤 Bernd Leutner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:32
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/08; C01D; C01D1/00; C01D1/04; C01D1/28; C25; C25B; C25B15/00; C25B15/08; C25B15/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
A process for removing chlorate from aqueous caustic soda by reducing with an iron compound and separating off the resulting iron oxide containing precipitate, which comprises using iron pentacarbonyl as reducing agent.
Claim 2
Dependent Claim
32 words
A process for removing chlorate from aqueous caustic soda by reducing with an iron compound and separating off the resulting iron oxide containing precipitate, which comprises using iron pentacarbonyl as reducing agent.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein from 0.5 to 3 moles of iron pentacarbonyl are used per mole of chlorate to be reduced.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1, wherein the reaction is carried out within the range from 20° C. to the boiling point of the caustic soda.
References Cited (Backward Citations)
US2415798A
Cited
GB642946A
Cited
US2622009A
Cited
US2562169A
Cited
GB664023A
Cited
GB798006A
Cited
US3325251A
Cited
GB1156227A
Cited
GB1523979A
Cited
JPS5370998A
Cited
US4055476A
Cited
SU724439A1
Cited
JPS569446A
Cited
SU922070A1
Cited
US4372924A
Cited
SU945070A1
Cited
US4643808A
Cited
US4676971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |