US4405505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the preparation of phthalic anhydride
Assignee: Polynt SpA
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Filing: 1981-03-25
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Granted: 1983-09-20
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Expires: 2001-03-25
Abstract
Abstract A catalyst for the preparation of phthalic anhydride is disclosed which comprises a carrier having an open arcuate configuration, e.g. in the form of half rings, and an active portion including V2O5 and porous TiO2 with the pores having mostly a radius in the 500 to 1,500 A range.
Inventors
- 👤 Amleto Neri
- 👤 Lorenzo Capitanio
- 👤 Giancarlo Stefani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:40
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/063; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B01J35/00; B01J35/50; B01J35/55; B01J35/60; B01J35/66
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A catalyst for the preparation of phthalic anhydride by oxidation of ortho-xylol or naphthalene, comprising as the active component thereof a mixture of vanadium pentoxide and titanium dioxide in a 1:5 to 1:20 ratio by weight, said titanium dioxide having more than 50% of the total pore volume thereof with radii in the 500 to 1,500 Angstrom range, said active component being distributed over an inert support or carrier comprising half-rings.
Claim 2
Dependent Claim
71 words
A catalyst for the preparation of phthalic anhydride by oxidation of ortho-xylol or naphthalene, comprising as the active component thereof a mixture of vanadium pentoxide and titanium dioxide in a 1:5 to 1:20 ratio by weight, said titanium dioxide having more than 50% of the total pore volume thereof with radii in the 500 to 1,500 Angstrom range, said active component being distributed over an inert support or carrier comprising half-rings.
Claim 3
Dependent Claim
51 words
A catalyst according to claim 1, wherein said support or carrier comprises elements substantially in the form of half rings having an outside diameter in the 6 to 13 mm range, an inside diameter in the 4 to 8 mm range, and a height in the 4 to 8 mm range.
Claim 4
Dependent Claim
32 words
A catalyst according to claim 1 or claim 2 wherein said pores having a radius in the 500 to 1,500 Angstrom range account for more than 80% of the total pore volume.
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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |