US4289708A
Expired / Lapsed
US
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Catalyst metal separation from saturated aliphatic monocarboxylic acids
Assignee: Celanese Corp
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Filing: 1979-08-09
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Granted: 1981-09-15
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Expires: 1999-08-09
Abstract
Abstract A process is described for separating soluble copper and manganese catalysts from organic saturated monocarboxylic acids having 3 to 9 carbon atoms by precipitating the copper and manganese as oxalates.
Inventors
- 👤 Robert H. Scott
- 👤 Hubert H. Thigpen
- 👤 Frank Wood, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:28
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
A process for separating manganese and copper from organic saturated aliphatic monocarboxylic acids having 3 to 9 carbon atoms which comprises treating said metal-containing organic acids with oxalic acid, in an amount sufficient to precipitate sebstantially all of the copper and manganese as cupric oxalate and manganous oxalate, and separating siad oxalates from said acids.
Claim 2
Dependent Claim
55 words
A process for separating manganese and copper from organic saturated aliphatic monocarboxylic acids having 3 to 9 carbon atoms which comprises treating said metal-containing organic acids with oxalic acid, in an amount sufficient to precipitate sebstantially all of the copper and manganese as cupric oxalate and manganous oxalate, and separating siad oxalates from said acids.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said oxalates are filtered from said acids.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said oxalates are separated from said acids by centrifugation.
Claim 5
Dependent Claim
59 words
In a process of oxidizing saturated aliphatic aldehydes having 3 to 9 carbon atoms to their corresponding acids using soluble copper and manganese catalysts, the improvement comprising adding sufficient oxalic acid to the metal-containing organic acid product to precipitate substantially all of the copper and manganese to cupric oxalate and manganous oxalate and separating said oxalates from said acids.
Claim 6
Dependent Claim
59 words
In a process of oxidizing saturated aliphatic aldehydes having 3 to 9 carbon atoms to their corresponding acids using soluble copper and manganese catalysts, the improvement comprising adding sufficient oxalic acid to the metal-containing organic acid product to precipitate substantially all of the copper and manganese to cupric oxalate and manganous oxalate and separating said oxalates from said acids.
Claim 7
Dependent Claim
11 words
The process of claim 4 wherein said acid is heptanoic acid.
Claim 8
Dependent Claim
11 words
The process of claim 4 wherein said acid is nonanoic acid.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |