US4348296A
Expired / Lapsed
US
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Crystalline lithium aluminates
Assignee: FMC Corp
•
Filing: 1980-12-18
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Granted: 1982-09-07
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Expires: 2000-12-18
Abstract
Abstract Porous substrates containing seeds of hydrous crystalline alumina are contacted with an aqueous solution of alkaline aluminate, thereby causing additional crystalline hydrous alumina to grow on the seeds within the pores of the substrate.
Inventors
- 👤 William C. Bauman
- 👤 John M. Lee
- 👤 John L. Burba, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/14; C01F7/141; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/17; B01J47/00; B01J47/018; C01D; C01D15/00; C01F7/043; C01P; C01P2006/00; C01P2006/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
A process for growing crystalline hydrous alumina within the pores of a porous substrate, said process comprising providing a seed of crystalline hydrous alumina in said pores by the in-situ precipitation of soluble Al values, thereby forming amorphous hydrous alumina, converting the so-formed amorphous hydrous alumina to crystalline hydrous alumina by heating, and adding to the seed-bearing substrate on aqueous solution of an alkaline aluminate, thereby providing aluminum oxide values which grow additional quantities of crystalline hydrous alumina on the crystalline hydrous alumina seeds.
Claim 2
Dependent Claim
84 words
A process for growing crystalline hydrous alumina within the pores of a porous substrate, said process comprising providing a seed of crystalline hydrous alumina in said pores by the in-situ precipitation of soluble Al values, thereby forming amorphous hydrous alumina, converting the so-formed amorphous hydrous alumina to crystalline hydrous alumina by heating, and adding to the seed-bearing substrate on aqueous solution of an alkaline aluminate, thereby providing aluminum oxide values which grow additional quantities of crystalline hydrous alumina on the crystalline hydrous alumina seeds.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the alkaline aluminate is sodium aluminate.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the alkaline aluminate becomes diluted during its addition to the crystalline hydrous alumina.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the alkaline aluminate comprises NaAlO 2 .xNaOH where x is a numerical value of about 0.1 to 0.5.
Claim 6
Dependent Claim
31 words
The process of claim 1 wherein the production of the additional quantities of crystalline hydrous alumina is promoted by addition of an acid which forms a soluble salt with the alkali.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein the acid is HCl.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the porous substrate is selected from the group consisting of inorganic, organic, polymeric and resinous materials.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein the porous substrate is a macroporous ion exchange resin.
Claim 10
Dependent Claim
29 words
The process of claim 1 wherein there is provided the additional procedure of reacting the so-formed crystalline hydrous alumina with LiOH to form crystalline LiOH.2Al(OH) 3 .nH 2 O.
Claim 11
Dependent Claim
40 words
The process of claim 1 wherein there is provided the additional procedure of reacting the so-formed crystalline hydrous alumina with lithium salt, LiX, to form crystalline LiX.2Al(OH) 3 .nH 2 O where X is the anion of the lithium salt.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein the LiX is LiCl.
Claim 13
Dependent Claim
18 words
A porous substrate containing crystalline hydrous alumina with its pores when prepared by the process of claim 1.
Claim 14
Dependent Claim
12 words
The composition of claim 12 when the crystalline hydrous alumina is gibbsite.
Claim 15
Dependent Claim
12 words
The composition of claim 12 when the crystalline hydrous alumina is norstrandite.
Claim 16
Dependent Claim
12 words
The composition of claim 12 when the crystalline hydrous alumina is bayerite.
Claim 17
Dependent Claim
13 words
Crystalline LiOH.2Al(OH) 3 .nH 2 O when prepared in accordance with claim 9.
Claim 18
Dependent Claim
13 words
Crystalline LiOH.2Al(OH) 3 .nH 2 O when prepared in accordance with claim 10.
References Cited (Backward Citations)
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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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |