US4252643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of toxic and odorous organics from waste water by saturated activated carbon
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1979-05-07
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Granted: 1981-02-24
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Expires: 1999-05-07
Abstract
Abstract An adsorption process for the selective removal of naphthalenic hydrocarbons in the waste water from a petrochemical operation which comprises contacting the effluent waste water for relatively short periods with activated carbon which has become saturated with respect to non-naphthalenic organics. Contact of the waste water streams with the saturated carbon is continued until the breakthrough of naphthalenic compounds in the waste water exceeds a predetermined concentration, such as 2 ppm. It has been found that efficient removal of naphthalenic compounds can be effected by contacting the waste water for relatively short contact times, for example 10 minutes, notwithstanding the fact that the activated carbon has previously become saturated with respect to non-naphthalenic compounds.
Inventors
- 👤 Eva Knettig
- 👤 J. Christopher Kempling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:17
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A continuous adsorption process for the selective removal of naphthalenic hydrocarbons in a waste water stream containing said naphthalenic hydrocarbons, which comprises: (a) passing said waste water stream through a bed of activated carbon which has become saturated with respect to its ability to adsorb non-naphthalenic hydrocarbons; (b) monitoring the effluent waste water from the activated carbon bed to determine the concentration of naphthalenic hydrocarbon therein; and (c) discontinuing passage of said waste water stream through said bed of activated carbon when the concentration of naphthalenic hydrocarbon in the effluent waste water exceeds a predetermined concentration.
Claim 2
Dependent Claim
96 words
A continuous adsorption process for the selective removal of naphthalenic hydrocarbons in a waste water stream containing said naphthalenic hydrocarbons, which comprises: (a) passing said waste water stream through a bed of activated carbon which has become saturated with respect to its ability to adsorb non-naphthalenic hydrocarbons; (b) monitoring the effluent waste water from the activated carbon bed to determine the concentration of naphthalenic hydrocarbon therein; and (c) discontinuing passage of said waste water stream through said bed of activated carbon when the concentration of naphthalenic hydrocarbon in the effluent waste water exceeds a predetermined concentration.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the passage of said waste water stream through said bed of activated carbon is discontinued when the naphthalenic hydrocarbon concentration in the effluent waste water exceeds about 2 ppm by weight.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein the duration of time necessary to effect removal of naphthalenic hydrocarbons to a concentration level of less than 2 ppm by weight ranges from about 3 to 10 minutes.
Claim 5
Dependent Claim
40 words
The process of claim 3 wherein the passage of the aqueous solution is discontinued and the bed of activated carbon regenerated, when the naphthalenic hydrocarbon concentration of the aqueous solution exiting from the bed exceeds about 2 ppm by weight.
Claim 6
Dependent Claim
23 words
The process of claim 4 wherein the waste water stream containing said naphthalenic compounds is a waste water stream from a petrochemical plant.
Claim 7
Dependent Claim
29 words
The process of claim 5 wherein the concentration of naphthalenic hydrocarbons in the waste water stream entering the bed of activated carbon is less than 25 ppm by weight.
Claim 8
Dependent Claim
31 words
The process of claim 6 wherein the concentration of non-naphthalenic organic compounds in the waste water stream entering the bed of activated carbon ranges from 20 to 1500 ppm by weight.
Claim 9
Dependent Claim
28 words
The process of claim 6 wherein the capacity of the bed of activated carbon for the removal of non-naphthalenic compounds ranges from 0.05 to 0.2 lb. TOC/lb. carbon.
References Cited (Backward Citations)
US3340316A
Cited
US4025426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |