US3906076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing zeolite X molecular sieve bodies
Assignee: WR Grace and Co
•
Filing: 1973-10-03
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Granted: 1975-09-16
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Expires: 1993-10-03
Abstract
Abstract It has been found that hard attrition-resistant zeolite X molecular sieve bodies can be produced by admixing zeolite X powder and meta-kaolin clay followed by the hydrothermal conversion of the meta-kaolin clay to zeolite X. When a reaction mixture contains from about 70 percent to 90 percent by weight of zeolite X powder and from about 10 percent to 30 percent by weight of meta-kaolin clay, this admixture will hydrothermally convert to essentially all zeolite X material. This conversion is accomplished without the addition of any silica source other than the silica provided by the meta-kaolin clay.
Inventors
- 👤 Jorge Alberto Goytisolo
- 👤 Donald Dongsuk Chi
- 👤 Hanju Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2815; C01B33/2838; C01B33/2846; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A METHOD OF FORMING SHAPED ZEOLITE X MATERIALS COMPRISING: A. FORMING AN ADMIXTUE OF ZEOLITE X AND META-KAOLIN CLAY WHEREIN SAID ZEOLITE X IS PRESENT IN A CONTENT OF ABOUT 70 PERCENT TO 90 PERCENT BY WEIGHT AND SAID META-KAOLIN CLAY COMPRISING THE REMAINDER OF THE ADMIXTURE, B. ADDING A SODIUM HYDROXIDE SOLUTION CONTAINING ABOUT 25 PERCENT TO 110 PERCENT OF THE NA2O REQUIRED TO CONVERT SAID META-KAOLIN COMPONENT TO ZEOLITE X AND THEREBY FORMING A PASTE-LIKE ADMIXTURE, C. FORMING SAID ADMIXTURE INTO SHAPES, D. AGING SAID SHAPES AT ABOUT 10*C TO 50*C FOR ABOUT 5 TO 40 HOURS, E. ADJUSTING THE CONTENT OF NA2O OF SAID AGED SHAPES TO ABOUT 110 PERCENT OF THAT REUIRED TO CONVERT SAID METAKAOLIN COMPONENT TO ZEOLITE X BY IMMERSING SAID SHAPES IN A SODIUM HYDROSIDE SOLUTION AND HYDROTHERMALLY CONVERTING SAID META-KAOLIN CLAY TO ZEOLITE X BY MAINTAINING SAID SHAPES AT ABOUT 65*C TO 110*C FOR ABOUT 4 TO 20 HOURS, F. WASHING SAID ZEOLITE X SHAPES TO REMOVE ANY EXCESS FREE SODIUM HYDROXIDE, AND
Claim 2
Independent Claim
171 words
A METHOD OF FORMING SHAPED ZEOLITE X MATERIALS COMPRISING: A. FORMING AN ADMIXTUE OF ZEOLITE X AND META-KAOLIN CLAY WHEREIN SAID ZEOLITE X IS PRESENT IN A CONTENT OF ABOUT 70 PERCENT TO 90 PERCENT BY WEIGHT AND SAID META-KAOLIN CLAY COMPRISING THE REMAINDER OF THE ADMIXTURE, B. ADDING A SODIUM HYDROXIDE SOLUTION CONTAINING ABOUT 25 PERCENT TO 110 PERCENT OF THE NA2O REQUIRED TO CONVERT SAID META-KAOLIN COMPONENT TO ZEOLITE X AND THEREBY FORMING A PASTE-LIKE ADMIXTURE, C. FORMING SAID ADMIXTURE INTO SHAPES, D. AGING SAID SHAPES AT ABOUT 10*C TO 50*C FOR ABOUT 5 TO 40 HOURS, E. ADJUSTING THE CONTENT OF NA2O OF SAID AGED SHAPES TO ABOUT 110 PERCENT OF THAT REUIRED TO CONVERT SAID METAKAOLIN COMPONENT TO ZEOLITE X BY IMMERSING SAID SHAPES IN A SODIUM HYDROSIDE SOLUTION AND HYDROTHERMALLY CONVERTING SAID META-KAOLIN CLAY TO ZEOLITE X BY MAINTAINING SAID SHAPES AT ABOUT 65*C TO 110*C FOR ABOUT 4 TO 20 HOURS, F. WASHING SAID ZEOLITE X SHAPES TO REMOVE ANY EXCESS FREE SODIUM HYDROXIDE, AND
Claim 3
Dependent Claim
27 words
A method as in claim 1 wherein the zeolite X and meta-kaolin clay in said admixture have an average particle size of about 0.1 to 50 microns.
Claim 4
Dependent Claim
34 words
A method as in claim 2 wherein said sodium hydroxide solution in step (b) supplies about 50 percent to 100 percent of the Na2O required to convert said meta-kaolin clay component to zeolite X.
Claim 5
Dependent Claim
13 words
The method as in claim 2 wherein said admixture is formed into granules.
Claim 6
Dependent Claim
13 words
The method as in claim 2 wherein said admixture is formed into spheres.
Claim 7
Dependent Claim
14 words
The method as in claim 2 wherein said admixture is extruded into cylindrical shapes.
Claim 8
Dependent Claim
20 words
The method as in claim 2 wherein said shapes are aged at room temperature for about 15 to 30 hours.
Claim 9
Dependent Claim
31 words
The method as in claim 2 wherein said aged shapes are contacted with said sodium hydroxide solution in step (e) at about 90*C to 100*C for about 8 to 12 hours.
Claim 10
Dependent Claim
25 words
The method as in claim 2 wherein said admixture contains about 20 percent by weight meta-kaolin clay and about 80 percent by weight zeolite X.
Claim 11
Dependent Claim
26 words
The method as in claim 2 wherein said admixture contains about 15 percent by weight meta-kaolin clay and about 85 percent by weight of zeolite X.
References Cited (Backward Citations)
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US3338672A
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US3515681A
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US3773690A
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US3795631A
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US3777006A
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |