US5393428A
Expired / Lapsed
US
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Process for treating waste water containing chlorinated organic compounds from production of epichlorohydrin
Assignee: Solvay GmbH
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Filing: 1993-09-02
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Granted: 1995-02-28
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Expires: 2013-09-02
Abstract
Abstract A process for treating waste water containing chlorinated organic substances, particularly waste water from production of epichlorohydrin which contains more than 10 mg of adsorbable organic halogen compounds (AOX) per liter, comprising charging the waste water at a pH of 10 to 14 (measured at room temperature) into a reactor and maintaining a temperature of at least 75°C., a pressure of at least 1 bar (abs.), and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating and/or dehydrochlorinating chlorinated organic compounds contained in the waste water, and thereafter subjecting the waste water to further dechlorination and/or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a hydrogen-releasing compound and/or a catalytically active material; and optionally subjecting the waste water to a biological treatment with the use of microorganisms; and apparatus for carrying out the foregoing process.
Inventors
- 👤 Wolfgang Dilla
- 👤 Helmut Dillenburg
- 👤 Erich Ploenissen
- 👤 Michael Sell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:05
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/72; C02F1/725; C02F1/58; C02F1/66; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1231; C07; C07D; C07D301/00; C07D301/32; C02F1/02; C02F1/025; C02F1/70; C02F2101/00; C02F2101/30; C02F2101/36; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
A process for treating a liquid containing more than 10 mg of adsorbable organic halogen compounds (AOX) per liter comprising the steps of introducing said liquid at a pH of 10 to 14 (measured at room temperature) into a reactor and in a first treatment step maintaining a temperature of at least 75° C., a pressure of at least 1 bar (abs.) and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating or dehydrochlorinating chlorinated organic compounds contained in the liquid; subsequently subjecting said liquid in a second treatment step to a further dechlorination or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a compound which releases hydrogen or a catalytically active substance, and discharging the treated liquid.
Claim 2
Dependent Claim
124 words
A process for treating a liquid containing more than 10 mg of adsorbable organic halogen compounds (AOX) per liter comprising the steps of introducing said liquid at a pH of 10 to 14 (measured at room temperature) into a reactor and in a first treatment step maintaining a temperature of at least 75° C., a pressure of at least 1 bar (abs.) and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating or dehydrochlorinating chlorinated organic compounds contained in the liquid; subsequently subjecting said liquid in a second treatment step to a further dechlorination or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a compound which releases hydrogen or a catalytically active substance, and discharging the treated liquid.
Claim 3
Dependent Claim
25 words
A process according to claim 1, further comprising subjecting the liquid after said further dechlorination or dehydrochlorination treatment to a biological purification treatment with microorganisms.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein said liquid is waste water from the production of epichlorohydrin.
Claim 5
Dependent Claim
27 words
A process according to claim 1, further comprising adjusting the pH of said fluid to a value of from 10 to 14 prior to said introducing step.
Claim 6
Dependent Claim
83 words
A process according to claim 1, wherein said liquid is thermally treated in said first treatment step at a temperature of from 85° to 185° C. and a pressure of from 2 to 10.5 bar (abs.), with a residence time of from 1 to 8 hours, and said second treatment step is carried out in the presence of substantially pure hydrogen, a metal, a metal alloy, an inorganic or organic metal compound, or a mixture of at least two of the foregoing substances.
Claim 7
Dependent Claim
27 words
A process according to claim 1, wherein said second treatment step is carried out in the presence of a catalytically active palladium-containing compound deposited on a carrier.
Claim 8
Dependent Claim
13 words
A process according to claim 6, wherein said carrier is an aluminum-oxide-containing carrier.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein said liquid is waste water containing at least 0.15 g/liter of dissolved halogen-containing organic compounds.
Claim 10
Dependent Claim
43 words
A process according to claim 1, wherein said second treatment step is carried out in a series of at least 3 tubular reactors and wherein said liquid flows through said tubular reactors at a flow velocity of at least 4 meters per second.
Claim 11
Dependent Claim
21 words
A process according to claim 9, wherein said second treatment step is carried out in a series of 4 tubular reactors.
Claim 12
Dependent Claim
25 words
A process according to claim 9, wherein said liquid flows through said tubular reactors at a flow velocity of at least 8.5 meters per second.
Claim 13
Dependent Claim
19 words
A process according claim 1, further comprising the step of at least partially freeing said liquid of suspended solids.
Claim 14
Dependent Claim
20 words
A process according to claim 12, wherein said liquid is at least partially freed of suspended solids by chemical treatment.
Claim 15
Dependent Claim
20 words
A process according to claim 12, wherein said liquid is at least partially freed of suspended solids by mechanical filtration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-27 | 1998-08-29 | 1999-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-27 | 2002-08-29 | 2003-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-27 | 2006-08-29 | 2007-02-28 | $7700.00 | Window Closed / Lapsed |