US4093543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decomposition of formic acid in very low concentration
Assignee: Mobil Oil AS
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Filing: 1976-09-22
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Granted: 1978-06-06
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Expires: 1996-09-22
Abstract
Abstract The use of titania, zirconia, coprecipitated titania-zirconia or caustic on an inert solid inorganic support such as alumina or titania-zirconia to decompose formic acid in very dilute aqueous solutions thereof.
Inventors
- 👤 Paul G. Rodewald
- 👤 Werner O. Haag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:32
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; B; B01; B01J; B01J21/00; B01J21/06; B01J21/063; B01J21/066; C02; C02F; C02F1/00; C02F1/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
The process of increasing the pH of a very dilute solution of formic acid to 4.0 or higher which comprises contacting said solution with a heterogeneous formic acid decomposition catalyst consisting essentially of caustic on a solid inorganic substrate selected from the group consisting of alumina, titania-zirconia, titania, zirconia, silica, and mixtures thereof, at a temperature of from about 500° to 1200° F, said solution containing up to about 1.0 weight percent of formic acid.
Claim 2
Dependent Claim
75 words
The process of increasing the pH of a very dilute solution of formic acid to 4.0 or higher which comprises contacting said solution with a heterogeneous formic acid decomposition catalyst consisting essentially of caustic on a solid inorganic substrate selected from the group consisting of alumina, titania-zirconia, titania, zirconia, silica, and mixtures thereof, at a temperature of from about 500° to 1200° F, said solution containing up to about 1.0 weight percent of formic acid.
Claim 3
Dependent Claim
21 words
The process claimed in claim 1 wherein the formic acid content of said solution is up to about 0.1 weight percent.
Claim 4
Dependent Claim
13 words
The process claimed in claim 1 wherein said catalyst is caustic on alumina.
Claim 5
Dependent Claim
14 words
The process claimed in claim 1 wherein said catalyst is caustic on coprecipitated titania-zirconia.
Claim 6
Dependent Claim
13 words
The process claimed in claim 1 wherein said catalyst is caustic on titania.
Claim 7
Dependent Claim
13 words
The process claimed in claim 1 wherein said catalyst is caustic on zirconia.
Claim 8
Dependent Claim
13 words
The process claimed in claim 1 wherein said catalyst is caustic on silica.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |