US4701428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst of silicon and titanium having high mechanical strength and a process for its preparation.
Assignee: Enichem Sintesi SpA
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Filing: 1986-04-23
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Granted: 1987-10-20
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Expires: 2006-04-23
Abstract
Abstract The invention discloses a catalyst on the basis of silicon and titanium having the form of microspheres and constituted by oligomeric silica and by titanium-silicalite crystals having an oligomeric silica/titanium-silicalite molar ratio comprised within the range of from 0.05 to 0.11, wherein the crystals of titanium-silicalite are encaged by means of Si-O-Si bridges.
Inventors
- 👤 Giuseppe Bellussi
- 👤 Franco Buonomo
- 👤 Antonio Esposito
- 👤 Mario Clerici
- 👤 Ugo Romano
- 👤 Bruno Notari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:23
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/04; B; B01; B01J; B01J29/00; B01J29/89; C07C; C07C37/00; C07C37/60; C07C41/00; C07C41/01; C07C41/18; C07C41/26; C07D301/00; C07D301/02; C07D301/03; C07D301/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
A silicon and titanium catalyst, in form of microspheres, comprising oligomeric silica and crystals of titanium-silicalite with an oligomeric silica/titanium-silicalite molar ratio in the range of from 0.05 to 0.11, wherein said crystals of titanium-silicalite are encaged with each other by means of Si-O-Si bridges.
Claim 2
Dependent Claim
45 words
A silicon and titanium catalyst, in form of microspheres, comprising oligomeric silica and crystals of titanium-silicalite with an oligomeric silica/titanium-silicalite molar ratio in the range of from 0.05 to 0.11, wherein said crystals of titanium-silicalite are encaged with each other by means of Si-O-Si bridges.
Claim 3
Dependent Claim
21 words
Catalyst according to claim 1, wherein said microspheres have a diameter comprised within the range of from 5 to 1000 μm.
Claim 4
Dependent Claim
88 words
A process for the preparation of the catalyst as defined in claim 1 by preparing an aqueous solution of silica and tetraalkyl-ammonium hydroxide by hydrolyzing in the liquid phase a tetraalkyl-orthosilicate in an aqueous solution of tetraalkyl-ammonium hydroxide at a temperature in the range of from room temperature to 200° C. and at a time of from 0.2 to 10 hours; dispersing crystals of titanium silicalite in said aqueous solution, thus forming a suspension of crystals of titanium-silicalite and oligomeric silica; and subjecting said suspension to rapid drying.
Claim 5
Dependent Claim
10 words
Process according to claim 3, wherein the tetraalkyl-orthosilicate is tetraethyl-orthosilicate.
Claim 6
Dependent Claim
24 words
Process according to claim 3, wherein the hydrolysis takes place at a temperature comprised within the range of from 40° C. to 100° C.
Claim 7
Dependent Claim
23 words
Process according to claim 3, wherein the alkyl groups of the tetraalkyl-ammonium have a number of carbon atoms of from 1 to 5.
Claim 8
Dependent Claim
10 words
Process according to claim 6, wherein the tetraalkyl-ammonium is tetrapropyl-ammonium.
Claim 9
Dependent Claim
88 words
A process for the preparation of the catalyst as defined in claim 2 by preparing an aqueous solution of silica and tetraalkyl-ammonium hydroxide by hydrolyzing in the liquid phase a tetraalkyl-orthosilicate in an aqueous solution of tetraalkyl-ammonium hydroxide at a temperature in the range of from room temperature to 200° C. and at a time of from 0.2 to 10 hours; dispersing crystals of titanium silicalite in said aqueous solution, thus forming a suspension of crystals of titanium-silicalite and oligomeric silica; and subjecting said suspension to rapid drying.
References Cited (Backward Citations)
US3329481A
Cited
US4410501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |