Patent US3980580A successfully refreshed from Google Patents.
US3980580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen carrier composition
Assignee: Monsanto Co
•
Filing: 1974-01-02
•
Granted: 1976-09-14
•
Expires: 1994-01-02
Abstract
Abstract An oxygen carrier composition based on the metals lead, magnesium and aluminum and a vapor phase process for dehydrocoupling toluene and/or toluene derivatives to form stilbene and/or stilbene derivatives and for demethylating toluene and/or toluene derivatives to form benzene and/or benzene derivatives.
Inventors
- 👤 Dale B. Fox
- 👤 Talmage D. McMinn, Jr.
- 👤 Rodney D. Beckham
- 👤 Phillip D. Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:30
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/14; C; C07; C07C; C07C2/00; C07C2/76; C07C2/82; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
An oxygen carrier composition which comprises oxygen and the metals lead, magnesium and aluminum represented by the empirical formula Pb.sub.a Mg.sub.b Al.sub.c O.sub.d where a is a number from 0.005 to 1.0, b is a number from 0.5 to 1.5. c is a number from 0.5 to 5.0 and d is a number which satisfies the oxidation states of the metals and their quantities contained in the composition.
Claim 2
Dependent Claim
68 words
An oxygen carrier composition which comprises oxygen and the metals lead, magnesium and aluminum represented by the empirical formula Pb.sub.a Mg.sub.b Al.sub.c O.sub.d where a is a number from 0.005 to 1.0, b is a number from 0.5 to 1.5. c is a number from 0.5 to 5.0 and d is a number which satisfies the oxidation states of the metals and their quantities contained in the composition.
Claim 3
Dependent Claim
35 words
The composition of claim 1 wherein the composition of oxygen and the metals has the empirical formula Pb.sub.a Mg.sub.b Al.sub.c O.sub.d wherein a is 0.12, b is 1, c is 2 and d is 4.12.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the composition is PbO supported on MgAl 2 O 4 .
Claim 5
Dependent Claim
25 words
The composition of claim 3 wherein the loading of PbO on MgAl 2 O 4 is 1.0 to 50 weight percent of the total composition.
Claim 6
Dependent Claim
80 words
The process of preparing an oxygen carrier composition based on oxygen and the metals lead, magnesium and aluminum which comprises forming a solution of salts of the metals, adjusting the pH of the solution to from 7.0 to 11.0 by the addition of a base to cause precipitation of the metals, recovering the precipitate, washing the recovered precipitate to remove the formed basic salts, and drying and calcining the washed precipitate to form the composition of oxygen and the metals.
Claim 7
Dependent Claim
80 words
The process of preparing an oxygen carrier composition based on oxygen and the metals lead, magnesium and aluminum which comprises forming a solution of salts of the metals, adjusting the pH of the solution to from 7.0 to 11.0 by the addition of a base to cause precipitation of the metals, recovering the precipitate, washing the recovered precipitate to remove the formed basic salts, and drying and calcining the washed precipitate to form the composition of oxygen and the metals.
Claim 8
Dependent Claim
44 words
The process of claim 5 wherein the solution is aqueous, the metal salts are nitrates, the base is ammonium hydroxide, the pH is adjusted to 7-10, and the calcination is conducted at a temperature of 900° to 1400°C for from 0.5 to 24 hours.
Claim 9
Dependent Claim
25 words
The process of claim 5 wherein the ratio of salts of Mg:Al is from 2:1 to 1:5 and of Pb:Mg is from 0.005:1 to 2:1.
References Cited (Backward Citations)
US3436358A
Cited
US3329727A
Cited
US3438724A
Cited
US3435089A
Cited
US3498927A
Cited
US3791992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |