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US4568447A
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Process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream
Assignee: Honeywell UOP LLC
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Filing: 1985-07-29
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Granted: 1986-02-04
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Expires: 2005-07-29
Abstract
Abstract A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprises the steps of: (a) contacting a solvent, which in the supercritical state is effective to dissolve the hydrocarbonaceous compounds from the aqueous stream, with the aqueous stream, for a time sufficient at supercritical solvent conditions to dissolve at least a portion of the hydrocarbonaceous compounds and to produce an aqueous stream having a reduced hydrocarbonaceous compound concentration; (b) separating the hydrocarbonaceous compounds from the solvent at subcritical conditions; and (c) recovering the hydrocarbonaceous compounds.
Inventors
- 👤 Peter R. Pujado
- 👤 John G. Sikonia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:33
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/26; C10; C10G; C10G45/00; C10G45/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprises the steps of: (a) contacting a solvent, which in the supercritical state is effective to dissolve said hydrocarbonaceous compounds from said aqueous stream, with said aqueous stream, for a time sufficient at supercritical solvent conditions to dissolve at least a portion of said hydrocarbonaceous compounds and to produce an aqueous stream having a reduced hydrocarbonaceous compound concentration; (b) separating said hydrocarbonaceous compounds from said solvent at subcritical conditions; and (c) recovering said hydrocarbonaceous compounds.
Claim 2
Dependent Claim
91 words
A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprises the steps of: (a) contacting a solvent, which in the supercritical state is effective to dissolve said hydrocarbonaceous compounds from said aqueous stream, with said aqueous stream, for a time sufficient at supercritical solvent conditions to dissolve at least a portion of said hydrocarbonaceous compounds and to produce an aqueous stream having a reduced hydrocarbonaceous compound concentration; (b) separating said hydrocarbonaceous compounds from said solvent at subcritical conditions; and (c) recovering said hydrocarbonaceous compounds.
Claim 3
Dependent Claim
45 words
The process of claim 1 wherein said solvent is selected from the group consisting of carbon dioxide, saturated and unsaturated hydrocarbons containing up to about 5 carbon atoms, nitrous oxides, saturated and unsaturated halogenated hydrocarbons containing up to about 3 carbon atoms and mixtures thereof.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said separation of step (b) is effected by adjusting the temperature or pressure of said solvent.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein said trace quantities of hydrocarbonaceous compounds are present in said aqueous stream in an amount from about 1 to about 10,000 PPM.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said trace quantities of hydrocarbonaceous compounds comprise halogenated hydrocarbons.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said trace quantities of hydrocarbonaceous compounds comprise sulfur, oxygen, metal, or nitrogen components.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the contact time in step (a) is from about 0.1 to about 100 minutes.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein said aqueous stream having a reduced hydrocarbonaceous compound concentration is essentially hydrocarbon-free.
Claim 10
Dependent Claim
108 words
A process for the removal of trace quantities of hydrocarbonaceous compounds having obnoxious characteristics from an aqueous stream which comprises the steps of: (a) contacting a solvent, which in the supercritical state is effective to dissolve said hydrocarbonaceous compounds from said aqueous stream, with said aqueous stream, for a time sufficient at supercritical solvent conditions to dissolve at least a portion of said hydrocarbonaceous compounds and to produce an aqueous stream having a reduced hydrocarbonaceous compound concentration; (b) separating said hydrocarbonaceous compounds from said solvent at subcritical conditions; and (c) hydrotreating said hydrocarbonaceous compounds recovered from step (b) whereby the obnoxious characteristics of said hydrocarbonaceous compounds are reduced.
Claim 11
Dependent Claim
108 words
A process for the removal of trace quantities of hydrocarbonaceous compounds having obnoxious characteristics from an aqueous stream which comprises the steps of: (a) contacting a solvent, which in the supercritical state is effective to dissolve said hydrocarbonaceous compounds from said aqueous stream, with said aqueous stream, for a time sufficient at supercritical solvent conditions to dissolve at least a portion of said hydrocarbonaceous compounds and to produce an aqueous stream having a reduced hydrocarbonaceous compound concentration; (b) separating said hydrocarbonaceous compounds from said solvent at subcritical conditions; and (c) hydrotreating said hydrocarbonaceous compounds recovered from step (b) whereby the obnoxious characteristics of said hydrocarbonaceous compounds are reduced.
Claim 12
Dependent Claim
18 words
The process of claim 9 wherein said aqueous stream having a reduced hydrocarbonaceous compound concentration is essentially hydrocarbon-free.
Claim 13
Dependent Claim
45 words
The process of claim 9 wherein said solvent is selected from the group consisting of carbon dioxide, saturated and unsaturated hydrocarbons containing up to about 5 carbon atoms, nitrous oxides, saturated and unsaturated halogenated hydrocarbons containing up to about 3 carbon atoms and mixtures thereof.
Claim 14
Dependent Claim
22 words
The process of claim 9 wherein said separation of step (b) is effected by adjusting the temperature or pressure of said solvent.
Claim 15
Dependent Claim
28 words
The process of claim 9 wherein said trace quantities of hydrocarbonaceous compounds are present in said aqueous stream in an amount from about 1 to about 10,000 PPM.
Claim 16
Dependent Claim
15 words
The process of claim 9 wherein said trace quantities of hydrocarbonaceous compounds comprise halogenated hydrocarbons
Claim 17
Dependent Claim
19 words
The process of claim 9 wherein said trace quantities of hydrocarbonaceous compounds comprise sulfur, oxygen, metal, or nitrogen components.
Claim 18
Dependent Claim
20 words
The process of claim 9 wherein the contact time in step (a) is from about 0.1 to about 100 minutes.
Claim 19
Dependent Claim
24 words
The process of claim 9 wherein said hydrotreating in step (c) is conducted in the presence of a catalyst comprising alumina, cobalt and molybdenum.
Claim 20
Dependent Claim
67 words
The process of claim 9 wherein said hydrotreating in step (c) is conducted at conditions which include a pressure from about 300 psig to about 2000 psig, a maximum catalyst temperature from about 400° F. to about 850° F., a liquid hourly space velocity from about 0.2 hr -1 to about 10 hr -1 and a hydrogen circulation rate from about 200 SCFB to about 10,000 SCFB.
Claim 21
Dependent Claim
28 words
The process of claim 9 wherein said hydrotreating in step (c) is conducted by introducing said hydrocarbonaceous compounds recovered from step (b) in admixture with a carrier hydrocarbon.
Claim 22
Dependent Claim
12 words
The process of claim 19 wherein said carrier hydrocarbon is diesel fuel.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |