Patent US4634995A successfully refreshed from Google Patents.
Patent US3865880A successfully refreshed from Google Patents.
US3865880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decolorization of ketones
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-09-09
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Granted: 1975-02-11
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Expires: 1991-09-09
Abstract
Abstract A method for the treatment of crude off-color alkanone product streams which involves percolating the streams through a bed containing a color-body reducing agent, i.e., metal borohydrides and preferably a filter material in admixture and thereby recoverying a product having an improved color.
Inventors
- 👤 Joseph R Quelly
- 👤 Thomas P Mcnamara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:51
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/79
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A METHOD FOR DECOLORIZING OFF-COLOR KETONE STREAMS CONTAINING ALKANONES HAVING FROM 3-12 CARBON ATOMS AND CONTAINING COLOR CAUSING IMPURITIES COMPRISING DIKETONE COLOR BODIES, WHICH METHOD COMPRISES PASSING SAID STREAM THROUGH A BED COMPRISING IN ADMIXTURE AS ALKALI METAL BOROHYDRIDE AND A FILTER MATERIAL SELECTED FROM THE GROUP CONSISTING OF ATTAPULGUS CLAY, CRUSHED FIREBRICK, DIATOMACEOUS EARTH AND MIXTURES THEREOF WHEREIN THE AMOUNT OF ALKALI METAL BOROHYDRIDE IS IN THE RANGE OF FROM ABOUT 1-20 PERCENT BY WEIGHT BASED ON THE AMOUNT OF FILTER MATERIAL PRESENT IN ADMIXTURE AND AT A TEMPERATURE IN THE RANGE OF FROM 15*-30*C AND A FEED RATE OF FROM ABOUT 300-500 LBS/HR. BASED ON THE AMOUNT OF ALKALI METAL BOROHYDRIDE EMPOLYED, SAID FEED RATE PROVIDING A CONTACT TIME OF FROM 1-30 MINUTES FOR SAID STREAMS WITH SAID BED, AND THEREAFTER RECOVERING A SUBSTANTIALLY WATER-WHITE KETONE CONTAINING STREAM.
Claim 2
Independent Claim
140 words
A METHOD FOR DECOLORIZING OFF-COLOR KETONE STREAMS CONTAINING ALKANONES HAVING FROM 3-12 CARBON ATOMS AND CONTAINING COLOR CAUSING IMPURITIES COMPRISING DIKETONE COLOR BODIES, WHICH METHOD COMPRISES PASSING SAID STREAM THROUGH A BED COMPRISING IN ADMIXTURE AS ALKALI METAL BOROHYDRIDE AND A FILTER MATERIAL SELECTED FROM THE GROUP CONSISTING OF ATTAPULGUS CLAY, CRUSHED FIREBRICK, DIATOMACEOUS EARTH AND MIXTURES THEREOF WHEREIN THE AMOUNT OF ALKALI METAL BOROHYDRIDE IS IN THE RANGE OF FROM ABOUT 1-20 PERCENT BY WEIGHT BASED ON THE AMOUNT OF FILTER MATERIAL PRESENT IN ADMIXTURE AND AT A TEMPERATURE IN THE RANGE OF FROM 15*-30*C AND A FEED RATE OF FROM ABOUT 300-500 LBS/HR. BASED ON THE AMOUNT OF ALKALI METAL BOROHYDRIDE EMPOLYED, SAID FEED RATE PROVIDING A CONTACT TIME OF FROM 1-30 MINUTES FOR SAID STREAMS WITH SAID BED, AND THEREAFTER RECOVERING A SUBSTANTIALLY WATER-WHITE KETONE CONTAINING STREAM.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal borohydride is sodium borohydride.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said alkanone is selected from the group consisting of methyl ethyl ketone and methyl isobutylketone.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said streams are passed through said bed for contact times in the range of from 1 to 15 minutes.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said alkanone is methyl isobutyl ketone.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said alkanone is methyl ethyl ketone.
Claim 8
Dependent Claim
12 words
The process of claim 3 wherein said filter material is attapulgus clay.
Claim 9
Dependent Claim
27 words
The process of claim 7 wherein said borohydride is present in concentrations of from 6 to 8 wt. percent based on the amount of filter material present.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |