US4077908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of material consisting of solid hollow spheroids
Assignee: Hoechst AG
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Filing: 1976-09-03
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Granted: 1978-03-07
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Expires: 1996-09-03
Abstract
Abstract Production of solid, hollow and spheroidic material for use as a carrier supporting motor exhaust gas decontamination catalysts. To this end, spheroidal particles of material being oxidizable and/or low melting and/or soluble in organic solvents are placed on to a pelletizing table. Ceramic pulverulent material is distributed thereover and a aqueous cellulose ether solution is simultaneously sprayed thereonto to cause deposition of the ceramic material on the particles. The resulting pellets are dried at 20 DEG - 95 DEG C and freed from material being oxidizable and/or low melting and/or soluble in organic solvents, and finally calcined at 1000 DEG - 1500 DEG C.
Inventors
- 👤 Jurgen Stenzel
- 👤 Arnulf Hinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/2073; B01D2255/20753; B01D2255/20761; B01D2255/90; B01D2255/92; B01D2255/9202; B01J; B01J35/00; B01J35/50; B01J35/51; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/507
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
160 words
A process for making carrier material supporting motor exhaust gas decontamination catalysts, said carrier consisting essentially of solid hollow globules, which process comprises placing starting material consisting of spheroidal particles of sawdust having a diameter within the range 1 and 5 mm on to a pelletizing table, and spraying an aqueous cellulose ether solution thereonto so as to wet the particles' surface; distributing pulverized aluminum hydroxide, hydrous aluminum silicate or mixtures thereof over the wetted surface of the spheroidal sawdust particles; thereby causing said aluminum hydroxide, hydrous aluminum silicate or mixtures thereof to deposit on said sawdust particles; drying the resulting pellets at temperatures within the range 20° and 95° C; burning out the sawdust from the pellets; and calcining the pellets at temperatures within the range 1000° and 1500° C with the resultant formation of said solid hollow globules having an inner diameter within the range 2 to 10 mm and a wall thickness of at least 1 mm.
Claim 2
Dependent Claim
160 words
A process for making carrier material supporting motor exhaust gas decontamination catalysts, said carrier consisting essentially of solid hollow globules, which process comprises placing starting material consisting of spheroidal particles of sawdust having a diameter within the range 1 and 5 mm on to a pelletizing table, and spraying an aqueous cellulose ether solution thereonto so as to wet the particles' surface; distributing pulverized aluminum hydroxide, hydrous aluminum silicate or mixtures thereof over the wetted surface of the spheroidal sawdust particles; thereby causing said aluminum hydroxide, hydrous aluminum silicate or mixtures thereof to deposit on said sawdust particles; drying the resulting pellets at temperatures within the range 20° and 95° C; burning out the sawdust from the pellets; and calcining the pellets at temperatures within the range 1000° and 1500° C with the resultant formation of said solid hollow globules having an inner diameter within the range 2 to 10 mm and a wall thickness of at least 1 mm.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, wherein the spheroidal sawdust particles have a diameter within the range of 2 and 4 mm.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1, wherein a 1% aqueous cellulose ether solution is sprayed on to the spheroidal sawdust particles.
Claim 5
Dependent Claim
16 words
The process as claimed in claim 1, wherein methyl cellulose is used as the cellulose ether.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 1, wherein the pellets are dried at 40° - 85° C.
Claim 7
Dependent Claim
170 words
A process for making carrier material supporting motor exhaust gas decontamination catalysts, said carrier consisting essentially of solid hollow globules, which process comprises placing starting material consisting of granular spheroidal polyethylene or polystyrene particles having a diameter within the range 1 and 5 mm on to a pelletizing table, and spraying an aqueous cellulose ether solution thereonto so as to wet the particles' surface; distributing pulverized aluminum hydroxide, hydrous aluminum silicate or mixtures thereof over the wetted surface of the granular spheroidal polyethylene or polystyrene particles; thereby causing said aluminum hydroxide, hydrous aluminum silicate or mixtures thereof to deposit on said polyethylene or polystyrene particles; drying the resulting pellets at temperatures within the range 20° and 95° C, freeing the pellets of the granular spheroidal polyethylene or polystyrene particles; and calcining the pellets at temperatures within the range 1000° and 1500° C with the resultant formation of said hollow globules having an inner diameter within the range 2 to 10 mm and a wall thickness of at least 1 mm.
Claim 8
Dependent Claim
170 words
A process for making carrier material supporting motor exhaust gas decontamination catalysts, said carrier consisting essentially of solid hollow globules, which process comprises placing starting material consisting of granular spheroidal polyethylene or polystyrene particles having a diameter within the range 1 and 5 mm on to a pelletizing table, and spraying an aqueous cellulose ether solution thereonto so as to wet the particles' surface; distributing pulverized aluminum hydroxide, hydrous aluminum silicate or mixtures thereof over the wetted surface of the granular spheroidal polyethylene or polystyrene particles; thereby causing said aluminum hydroxide, hydrous aluminum silicate or mixtures thereof to deposit on said polyethylene or polystyrene particles; drying the resulting pellets at temperatures within the range 20° and 95° C, freeing the pellets of the granular spheroidal polyethylene or polystyrene particles; and calcining the pellets at temperatures within the range 1000° and 1500° C with the resultant formation of said hollow globules having an inner diameter within the range 2 to 10 mm and a wall thickness of at least 1 mm.
Claim 9
Dependent Claim
20 words
The process as claimed in claim 6, wherein the pellets are freed of said granular particles by oxidizing the latter.
Claim 10
Dependent Claim
20 words
The process as claimed in claim 6, wherein the pellets are freed of said granular particles by melting the latter.
Claim 11
Dependent Claim
24 words
The process as claimed in claim 6, wherein the pellets are freed of said granular particles by dissolving the latter with an organic solvent.
Claim 12
Dependent Claim
21 words
The process as claimed in claim 6, wherein said granular particles have a diameter within the range 2 and 4 mm.
Claim 13
Dependent Claim
21 words
The process as claimed in claim 6, wherein a 1% aqueous cellulose ether solution is sprayed on to said granular particles.
Claim 14
Dependent Claim
16 words
The process as claimed in claim 6, wherein methyl cellulose is used as the cellulose ether.
Claim 15
Dependent Claim
17 words
The process as claimed in claim 6, wherein the pellets are dried at 40° - 85° C.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |