US4120943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pseudo-boehmite
Assignee: Asahi Kasei Corp
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Filing: 1976-12-17
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Granted: 1978-10-17
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Expires: 1996-12-17
Abstract
Abstract Pseudo-boehmite having a bulk density of about 0.05 to 0.2 g/cc, an oil absorption of about 2.5 to 6.0 cc/g, a pore volume of about 2.0 to 7.0 cc/g over a pore diameter range of 176 mu to 0.0035 mu and a specific surface area of about 200 to 500 m2/g, and a process for producing the same; useful as a filler, an absorbent, a catalyst, a filtering agent and a base material for composites; prepared by mixing alkali aluminate and halohydrin together at a low temperature, heating for reaction the resulting mixture, cooling the reacting solution, separating the resulting precipitate by filtration and, if desired subjecting the precipitate to washing with an organic solvent followed by drying.
Inventors
- 👤 Toshiyuki Iwaisako
- 👤 Naomi Yamaguchi
- 👤 Hisao Yomogida
- 👤 Yoshinobu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:13
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J35/00; B01J35/60; B01J35/63; B01J35/638; B01J35/64; B01J35/657; B01J37/00; B01J37/22; B01J2235/00; B01J35/30; B01J35/31; B01J35/32; B01J35/40; B01J35/61; B01J35/615; B01J35/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A process for the production of a pseudo-boehmite product which comprises initially mixing an alkali aluminate and a halohydrin selected from the gorup consisting of ethylene chlorohydrin, propylene chlorohydrin, epichlorohydrin, trimethylene chlorohydrin, glycerol monochlorohydrin, glycerol dichlorohydrin, and 1-hydroxy-2-chloropropyl-methacrylate for a period of 5 seconds to 10 hours at a temperature of from -10° C. to 50° C., the molar ratio of halohydrin to alkali aluminate being from 0.8 to 20, the concentration of alkali aluminate being up to 25% by weight, and thereafter raising the temperature of the mixture to from 50° C. to 100° C. to effect precipitation of the desired pseudo-boehmite; said pseudo-boehmite characterized by the following physical properties: (a) bulk density, 0.05 to 0.2 g/cc; (b) oil absorption, 2.5 to 6.0 cc/g; (c) specific surface area, 200 to 500 m 2 /g; (d) pore volume, 2.0 to 7.0 cc/g (0.0035μ-176μ); (e) Pore volume, 2.0 to 4.0 cc/g (0.176μ-176μ).
Claim 2
Dependent Claim
151 words
A process for the production of a pseudo-boehmite product which comprises initially mixing an alkali aluminate and a halohydrin selected from the gorup consisting of ethylene chlorohydrin, propylene chlorohydrin, epichlorohydrin, trimethylene chlorohydrin, glycerol monochlorohydrin, glycerol dichlorohydrin, and 1-hydroxy-2-chloropropyl-methacrylate for a period of 5 seconds to 10 hours at a temperature of from -10° C. to 50° C., the molar ratio of halohydrin to alkali aluminate being from 0.8 to 20, the concentration of alkali aluminate being up to 25% by weight, and thereafter raising the temperature of the mixture to from 50° C. to 100° C. to effect precipitation of the desired pseudo-boehmite; said pseudo-boehmite characterized by the following physical properties: (a) bulk density, 0.05 to 0.2 g/cc; (b) oil absorption, 2.5 to 6.0 cc/g; (c) specific surface area, 200 to 500 m 2 /g; (d) pore volume, 2.0 to 7.0 cc/g (0.0035μ-176μ); (e) Pore volume, 2.0 to 4.0 cc/g (0.176μ-176μ).
Claim 3
Dependent Claim
33 words
A process as in claim 1 wherein the precipitated pseudo-boehmite is washed with an organic solvent selected from a group consisting of acetone and an alcohol having from 1 to 5 carbon atoms.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1 wherein precipitation is effected at a temperature of 60° C. to 90° C.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 wherein the alkali aluminate is sodium aluminate or potassium aluminate.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1 wherein the alkali aluminate has an atomic ratio of alkali to aluminum of 1:1 to 1.5:1 and contains excess alkali.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1 wherein the concentration of alkali aluminate is from 1 to 20% by weight.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 1 wherein the concentration of alkali aluminate is from 5 to 15% by weight.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 1 wherein the molar ratio of halohydrin to alkali aluminate is from 0.8 to 20.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 1 wherein the molar ratio of halohydrin to alkali aluminate is from 0.9 to 10.
Claim 11
Dependent Claim
20 words
A process as in claim 1 wherein excess alkali, when present, is neutralized with mineral acid or gaseous carbon dioxide.
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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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |