US4283306A
Expired / Lapsed
US
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Crystalline silica and use in alkylation of aromatics
Assignee: EIDP Inc
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Filing: 1980-03-26
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Granted: 1981-08-11
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Expires: 2000-03-26
Abstract
Abstract Novel crystalline silicas and their use as alkylation catalysts, e.g., methylation of toluene. The performance of the catalysts can be improved by selected promoters.
Inventors
- 👤 Frank E. Herkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:49
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/864; B; B01; B01J; B01J23/00; B01J23/02; B01J23/16; B01J23/18; B01J29/00; B01J29/03; B01J29/035; C07C2/865; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/30; B01J2229/32; B01J2229/42; C07C2529/00; C07C2529/03; C07C2529/035; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/582
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A process for preparing a promoted crystalline silica catalyst comprising contacting crystalline silica with a member selected from the group consisting of arsenic oxide, phosphorus oxide, magnesium oxide, boron oxide, antimony oxide, amorphous silica, alkaline earth metal oxides, alkaline earth metal carbonates and mixtures and precursors of the foregoing, and thermally activating the resulting crystalline silica/promoter combination.
Claim 2
Dependent Claim
57 words
A process for preparing a promoted crystalline silica catalyst comprising contacting crystalline silica with a member selected from the group consisting of arsenic oxide, phosphorus oxide, magnesium oxide, boron oxide, antimony oxide, amorphous silica, alkaline earth metal oxides, alkaline earth metal carbonates and mixtures and precursors of the foregoing, and thermally activating the resulting crystalline silica/promoter combination.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the amorphous silica precursor is selected from the group consisting of ethylorthosilicate and phenylmethylsilicone.
Claim 4
Dependent Claim
24 words
A crystalline silica polymorph having essentially clear intracrystalline channels, axes in the range 5.0-6.5 Angstrom units and a density in the range 1.81-1.94 gms/ml.
Claim 5
Dependent Claim
24 words
A crystalline silica polymorph having essentially clear intracrystalline channels, axes in the range 5.0-6.5 Angstrom units and a density in the range 1.81-1.94 gms/ml.
Claim 6
Dependent Claim
28 words
The silica of claim 3, wherein the width at one-half height of the diffraction peak at d(A)=3.00±0.05 under X-ray diffraction is in the range of about 0.05°-0.210° (2θ).
Claim 7
Dependent Claim
24 words
The silica of claim 3 wherein the crystallinity of the silica as measured by peak to background ratio at d(A)=3.85±0.03 is at least 20.0.
Claim 8
Dependent Claim
13 words
The silica of claim 3 having a density in the range 1.83-1.89 gms/ml.
Claim 9
Dependent Claim
33 words
The silica of claim 4 wherein width at one-half height of the diffraction peaks at d(A)=3.00±0.05 and 1.46±0.05 under X-ray diffraction is in the range of about 0.210°-0.05° (2θ) and 0.320°-0.05° (2θ), respectively.
Claim 10
Dependent Claim
15 words
The silica of claim 6 wherein the peak to background ratio is at least 30.0.
Claim 11
Dependent Claim
13 words
The silica of claim 5 having a density in the range 1.83-1.89 gms/ml.
Claim 12
Dependent Claim
49 words
The silica of claims 3, 4, 5, 6, 7, 8 or 9 promoted by a member selected from the group consisting of arsenic oxide, phosphorus oxide, magnesium oxide, boron oxide, antimony oxide, amorphous silica, alkaline earth metal oxides, alkaline earth metal carbonates and mixtures and precursors of the foregoing.
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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |