US4650783A
Expired / Lapsed
US
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Phosphorus modified alumina molecular sieve and method of manufacture
Assignee: Honeywell UOP LLC
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Filing: 1985-12-20
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Granted: 1987-03-17
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Expires: 2005-12-20
Abstract
Abstract This invention relates to a molecular sieve comprising silicalite in a phosphorus modified alumina matrix, the precursor of the molecular sieve comprising silicalite powder dispersed in an alumina hydrosol commingled with a phosphorus containing compound, the phosphorus to aluminum molar ratio in the molecular sieve being from 1:1 to 1:100.
Inventors
- 👤 Tai-Hsiang Chao
- 👤 Michael T. Cleary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:41
CPC Classifications
C; C11; C11C; C11C1/00; C11C1/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A molecular sieve adsorbent comprising silicalite in a phosphorus modified alumina matrix the precursor of said molecular sieve comprising silicalite powder dispersed in a phosphorus-containing alumina hydrosol, the phosphorus to aluminum molar ratio in said hydrosol being from 1:1 to 100:1.
Claim 2
Dependent Claim
41 words
A molecular sieve adsorbent comprising silicalite in a phosphorus modified alumina matrix the precursor of said molecular sieve comprising silicalite powder dispersed in a phosphorus-containing alumina hydrosol, the phosphorus to aluminum molar ratio in said hydrosol being from 1:1 to 100:1.
Claim 3
Dependent Claim
14 words
The molecular sieve adsorbent of claim 1 wherein said molecular sieve comprises discrete particles.
Claim 4
Independent Claim
54 words
A method of manufacturing a molecular sieve adsorbent comprising silicalite in a phosphorus modified alumina matrix, which method comprises (a) mixing silicalite powder and a phosphorus containing alumina hydrosol; the phosphorus to aluminum molar ratio being from 1:1 to 1:100; and (b) obtaining particles of said molecular sieve from the admixture of step (a).
Claim 5
Independent Claim
54 words
A method of manufacturing a molecular sieve adsorbent comprising silicalite in a phosphorus modified alumina matrix, which method comprises (a) mixing silicalite powder and a phosphorus containing alumina hydrosol; the phosphorus to aluminum molar ratio being from 1:1 to 1:100; and (b) obtaining particles of said molecular sieve from the admixture of step (a).
Claim 6
Dependent Claim
74 words
The method of claim 3 wherein said particles are obtained by commingling said admixture with a gelling agent which is hydrolyzable at an elevated temperature, dispersing the hydrosol-gelling agent mixture as droplets in a suspending medium under conditions effective to transform said droplets into hydrogel particles, aging the hydrogel particles in the suspending medium, washing the hydrogel particles with water, drying and calcining the hydrogel particles to obtain spheroidal particles of said molecular sieve.
Claim 7
Dependent Claim
27 words
The method of claim 3 wherein the admixture is commingled with a gelling agent and spray dried at conditions effective to obtain particles of said molecular sieve.
Claim 8
Dependent Claim
11 words
The method of claim 5 wherein the gelling agent is hexamethylene-tetramine.
Claim 9
Dependent Claim
21 words
The method of claim 3 wherein the admixture is spray dried at conditions effective to obtain particles of said molecular sieve.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |