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US4661256A
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Process for the removal of hydrocarbonaceous compounds from an aqueous stream and hydrogenating these compounds
Assignee: Honeywell UOP LLC
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Filing: 1985-10-28
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Granted: 1987-04-28
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Expires: 2005-10-28
Abstract
Abstract A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprise the steps of: (a) contacting the aqueous stream with an adsorbent to remove trace quantities of hydrocarbonaceous compounds from the aqueous stream to provide an aqueous stream having a reduced concentration of hydrocarbonaceous compounds; (b) contacting spent adsorbent which has accumulated the hydrocarbonaceous compounds from the aqueous stream with an elution solvent to remove the hydrocarbonaceous compounds from the spent adsorbent thereby regenerating the adsorbent; (c) contacting the elution solvent in admixture with the hydrocarbonaceous compounds which were removed from the spent adsorbent in step (b) in the presence of hydrogen with a hydrogenation catalyst in a hydrotreating reaction zone; (d) contacting the hydrotreating reaction zone effluent with an aqueous scrubbing solution; and (e) introducing a resulting admixture of the reaction zone effluent and the aqueous scrubbing solution into a separation zone to provide a hydrotreated elution solvent and a spent aqueous stream.
Inventors
- 👤 Russell W. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:52
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C02; C02F; C02F1/00; C02F1/28; C02F1/281; C02F1/283; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
188 words
A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprises the steps of: (a) contacting said aqueous stream with an adsorbent to remove trace quantities of hydrocarbonaceous compounds from said aqueous stream to provide an aqueous stream having a reduced concentration of hydrocarbonaceous compounds; (b) contacting spent adsorbent which has accumulated said hydrocarbonaceous compounds from said aqueous stream with an elution solvent to remove said hydrocarbonaceous compounds from said spent adsorbent thereby regenerating said adsorbent; (c) contacting said elution solvent in admixture with said hydrocarbonaceous compounds which were removed from said spent adsorbent in step (b) in the presence of hydrogen with a hydrogenation catalyst in a hydrotreating reaction zone; (d) contacting the hydrotreating reaction zone effluent with an aqueous scrubbing solution; (e) introducing a resulting admixture of said reaction zone effluent and said aqueous scrubbing solution into a separation zone to provide a hydrotreated elution solvent and a spent aqueous stream; and (f) recycling at least a portion of said hydrotreated elution solvent from step (e) to provide at least a portion of said elution solvent utilized in step (b).
Claim 2
Dependent Claim
188 words
A process for the removal of trace quantities of hydrocarbonaceous compounds from an aqueous stream which comprises the steps of: (a) contacting said aqueous stream with an adsorbent to remove trace quantities of hydrocarbonaceous compounds from said aqueous stream to provide an aqueous stream having a reduced concentration of hydrocarbonaceous compounds; (b) contacting spent adsorbent which has accumulated said hydrocarbonaceous compounds from said aqueous stream with an elution solvent to remove said hydrocarbonaceous compounds from said spent adsorbent thereby regenerating said adsorbent; (c) contacting said elution solvent in admixture with said hydrocarbonaceous compounds which were removed from said spent adsorbent in step (b) in the presence of hydrogen with a hydrogenation catalyst in a hydrotreating reaction zone; (d) contacting the hydrotreating reaction zone effluent with an aqueous scrubbing solution; (e) introducing a resulting admixture of said reaction zone effluent and said aqueous scrubbing solution into a separation zone to provide a hydrotreated elution solvent and a spent aqueous stream; and (f) recycling at least a portion of said hydrotreated elution solvent from step (e) to provide at least a portion of said elution solvent utilized in step (b).
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said hydrocarbonaceous compounds comprise hazardous hydrocarbonaceous compounds.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said hazardous hydrocarbonaceous compounds are halogenated hydrocarbons or organometallic compounds.
Claim 5
Dependent Claim
77 words
The process of claim 1 wherein said hydrotreating reaction zone is operated at conditions which include a pressure from about 100 psig (689 k Pa gauge) to about 2000 psig (13790 k Pa gauge), a maximum catalyst temperature from about 350° F. (177° C.) to about 850° F. (454° C.) and a hydrogen circulation rate from about 200 SCFB (35.6 std m 3 /m 3 ) to about 10,000 SCFB (1778 std m 3 /m 3 ).
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said hydrogenation catalyst comprises a refractory inorganic oxide and at least one metallic compound having hydrogenation activity.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein said metallic compound is selected from the metals of Groups VI-B and VIII of the Periodic Table.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein said aqueous scrubbing solution comprises an alkaline compound.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein said alkaline compound is sodium hydroxide, potassium hydroxide or calcium hydroxide.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein said adsorbent is silica gel, activated carbon, activated alumina, silica-alumina gel, clay, molecular sieves or admixtures thereof.
Claim 11
Dependent Claim
63 words
The process of claim 1 wherein said contacting conducted in step (a) is performed at conditions which include a pressure from about atmospheric to about 1500 psig (10,342 k Pa gauge) and a temperature from about 32° F. (0° C.) to about 300° F. (149° C.) and a liquid hourly space velocity from about 0.1 hr -1 to about 500 hr -1 .
Claim 12
Dependent Claim
47 words
The process of claim 1 wherein the adsorbent regeneration conducted in step (b) is performed at conditions which include a pressure from about atmospheric to about 1500 psig (10,342 k Pa gauge) and a temperature from about 32° F. (0° C.) to about 300° F. (149° C.).
Claim 13
Dependent Claim
18 words
The process of claim 1 wherein said aqueous stream having a reduced hydrocarbonaceous compound concentration is essentially hydrocarbon-free.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein said elution solvent is naphtha, kerosene, diesel fuel, gas oil or mixtures thereof.
References Cited (Backward Citations)
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