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US4159969A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of agglomerates of porous aluminum oxide

Assignee: Akzona Inc
•
Filing: 1978-01-20
•
Granted: 1979-07-03
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Expires: 1998-01-20
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Abstract

Abstract A process for the preparation of agglomerates of aluminium oxide is disclosed. The process comprises contacting a hydrous aluminium oxide gel with an organic liquid which is essentially immiscible with water. The organic liquid is utilized in an amount such that the weight ratio of said liquid to water, as contained in the hydrous gel, lies within Region II of a plot of said ratio versus the pore volume of aluminium oxide obtained after being dried and calcined. Subsequent to the gel being contacted with the organic liquid, the gel is subjected to agglomeration conditions. Region II of the referenced plot is a region in which the slope of the curve plotting the ratio of organic liquid to water versus the pore volume, as discussed above, has a value equal to or greater than about 4.0.

Inventors

  • 👤 Rudolf A. J. Mone
  • 👤 Gijsbertus Klaver

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 15:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J37/00; B01J37/0009; B01J37/0018; C01; C01F; C01F7/00; C01F7/02; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/21

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 103 words
A process for the preparation of agglomerates of aluminum oxide comprising contacting a hydrous aluminum oxide gel with an organic liquid which is essentially immiscible with water, the amount of liquid utilized being such that the weight ratio of said liquid to water, as contained in the gel, lies within a portion of a curve which plots said ratio versus the pore volume of aluminum oxide obtained after being dried and calcined, expressed in terms of milliliters per gram, which portion has a slope equal to or greater than about 4.0, and agglomerating the gel subsequent to being contacted with the organic liquid.
Claim 2
Dependent Claim 103 words
A process for the preparation of agglomerates of aluminum oxide comprising contacting a hydrous aluminum oxide gel with an organic liquid which is essentially immiscible with water, the amount of liquid utilized being such that the weight ratio of said liquid to water, as contained in the gel, lies within a portion of a curve which plots said ratio versus the pore volume of aluminum oxide obtained after being dried and calcined, expressed in terms of milliliters per gram, which portion has a slope equal to or greater than about 4.0, and agglomerating the gel subsequent to being contacted with the organic liquid.
Claim 3
Dependent Claim 20 words
The process of claim 1 also comprising the steps of removing the liquid phase and subsequently calcining the resulting agglomerates.
Claim 4
Dependent Claim 15 words
The process of claim 1 wherein the organic liquid is an alcohol or an ester.
Claim 5
Dependent Claim 33 words
The process of claim 1 wherein the organic liquid is selected from the group consisting of isobutyl alcohol, amyl alcohol, 4-methyl-2-pentanol, N-heptanol, secondary octyl alcohol, nonanol, ethyl acetate, butyl acetate, and mixtures thereof.
Claim 6
Dependent Claim 18 words
The process of claim 1 further comprising the step of impregnating the aluminium oxide with a catalytically-active material.

References Cited (Backward Citations)

US4059681A Cited
US4013587A Cited
US3972990A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-07-02 1983-01-01 1983-07-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-07-02 1987-01-01 1987-07-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-07-02 1991-01-01 1991-07-03 $7700.00 Window Closed / Lapsed

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