US4482642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of slugs of pyrogenically produced oxides
Assignee: Evonik Operations GmbH
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Filing: 1982-08-09
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Granted: 1984-11-13
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Expires: 2002-08-09
Abstract
Abstract Pressed objects (slugs) of pyrogenically produced oxides such as SiO 2 , Al 2 O 3 and TiO 2 are produced using a silica sol and water. As molding assistants thereby there is employed a polyhydric alcohol, e.g. glycerine or sorbitol. The water can be added adsorbed on a pyrogenically produced hydrophobized silica. The pressed object obtained can be used inter alia as catalyst carrier.
Inventors
- 👤 Manfred Ettlinger
- 👤 Horst Ferch
- 👤 Detlev Koth
- 👤 Edgar Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J37/0018; B01J2/00; B01J2/22; C; C01; C01B; C01B13/00; C01B13/14; C01B13/145; C09; C09C; C09C3/00; C09C3/04; C09C3/045; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
A process for the production of a pressed object from a pyrogenically produced oxide which is an oxide of a metal, an oxide of a metalloid or a mixture thereof containing intensively mixing the pyrogenic oxide with water, silica sol and a polyhydric alcohol as a mold assistant which is ethanediol, glycerine, erythritol, pentitol or hexitol, and forming a flowable powder from the mixture, shaping the flowable powder by pressing to form a pressed object, slowly predrying the pressed object at a temperature up to 100° C. and subsequently tempering the predried pressed object at 450°-700° C.
Claim 2
Dependent Claim
97 words
A process for the production of a pressed object from a pyrogenically produced oxide which is an oxide of a metal, an oxide of a metalloid or a mixture thereof containing intensively mixing the pyrogenic oxide with water, silica sol and a polyhydric alcohol as a mold assistant which is ethanediol, glycerine, erythritol, pentitol or hexitol, and forming a flowable powder from the mixture, shaping the flowable powder by pressing to form a pressed object, slowly predrying the pressed object at a temperature up to 100° C. and subsequently tempering the predried pressed object at 450°-700° C.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the pyrogenic oxide is pyrogenically produced silica, aluminum oxide or titanium oxide.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein the polyhydric alcohol is used in an amount of 2 to 30% of the weight of the total mixture.
Claim 5
Dependent Claim
26 words
A process according to claim 3 wherein the polyhydric alcohol is used in an amount of 2 to 10% of the weight of the total mixture.
Claim 6
Dependent Claim
14 words
A process according to claim 3 wherein the polyhydric alcohol is glycerine or sorbitol.
Claim 7
Dependent Claim
26 words
A process according to claim 2 wherein the compressing is carried out to produce a pressed object having 50-60% of the volume as accessible pore space.
Claim 8
Dependent Claim
13 words
A process according to claim 2 wherein there is employed pyrogenically produced silica.
Claim 9
Dependent Claim
14 words
A process according to claim 2 wherein there is employed pyrogenically produced aluminum oxide.
Claim 10
Dependent Claim
14 words
A process according to claim 2 wherein there is employed pyrogenically produced titanium dioxide.
Claim 11
Dependent Claim
24 words
A process according to claim 2 wherein a portion of the water is employed in a form bound to a pyrogenically produced hydrophobized silica.
Claim 12
Dependent Claim
23 words
A process according to claim 1 wherein a portion of water is employed in a form bound to a pyrogenically produced hydrophobized silica.
Claim 13
Dependent Claim
10 words
A pressed object prepared by the process of claim 1.
Claim 14
Dependent Claim
10 words
A pressed object prepared by the process of claim 2.
Claim 15
Dependent Claim
10 words
A pressed object prepared by the process of claim 3.
Claim 16
Dependent Claim
10 words
A pressed object prepared by the process of claim 6.
Claim 17
Dependent Claim
10 words
A pressed object prepared by the process of claim 10.
Claim 18
Dependent Claim
10 words
A pressed object produced by the process of claim 11.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |