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US4524055A
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Crystalline aluminosilicate zeolite and process for production thereof
Assignee: Teijin Petrochemical Industries Ltd
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Filing: 1983-02-22
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Granted: 1985-06-18
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Expires: 2003-02-22
Abstract
Abstract A novel crystalline aluminosilicate zeolite characterized by having (a) a silica/alumina mole ratio in the range of from 10 to 100, (b) X-ray lattice distances d shown in Table A in the specification, and (c) a (cyclohexane/n-hexane) adsorption ratio of at least 0.7. This crystalline aluminosilicate zeolite is useful, for example, as a catalyst in the isomerization reaction or transalkylation reaction of alkylbenzenes or alkylnaphthalenes, and can be prepared by heating a crystalline aluminosilicate zeolite ZSM-5 having a silica/alumina mole ratio of from 20 to 300 at a temperature between 80° C. and 250° C. in an aqueous solution containing 0.1 to 1 g, per gram of the ZSM-5 zeolite, of an alkali metal hydroxide.
Inventors
- 👤 Tamio Onodera
- 👤 Tokuji Sakai
- 👤 Yasuo Yamasaki
- 👤 Koji Sumitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:43
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/44; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; C07C2529/00; C07C2529/04; C07C2529/06; Y; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A crystalline aluminosilicate zeolite characterized by having (a) a silica/alumina mole ratio in the range of from 10 to 100, (b) X-ray lattice distances d shown in Table A in the specification, (c) a (cyclohexane/n-hexane) adsorption ratio of at least 0.7, and (d) when the intensity (I o ) of the X-ray diffraction peak at d(Å)=3.86 is taken as 100, the relative intensity (I/I o ) of the X-ray diffraction peak d(Å)=3.83 is at least 75.
Claim 2
Dependent Claim
76 words
A crystalline aluminosilicate zeolite characterized by having (a) a silica/alumina mole ratio in the range of from 10 to 100, (b) X-ray lattice distances d shown in Table A in the specification, (c) a (cyclohexane/n-hexane) adsorption ratio of at least 0.7, and (d) when the intensity (I o ) of the X-ray diffraction peak at d(Å)=3.86 is taken as 100, the relative intensity (I/I o ) of the X-ray diffraction peak d(Å)=3.83 is at least 75.
Claim 3
Dependent Claim
19 words
The zeolite of claim 1 wherein the silica/alumina mole ratio is in the range of from 15 to 70.
Claim 4
Dependent Claim
14 words
The zeolite of claim 1 wherein the (cyclohexane/n-hexane) adsorption ratio is at least 0.8.
Claim 5
Dependent Claim
20 words
The zeolite of claim 1 which has a cyclohexane decomposition index ratio, in the activated state, of at least 1.1.
Claim 6
Dependent Claim
15 words
The zeolite of claim 4 wherein the cyclohexane decomposition index ratio is at least 1.5.
Claim 7
Dependent Claim
56 words
A process for producing the zeolite of claim 1, which comprises heating a crystalline aluminosilicate zeolite ZSM-5 having a silica/alumina mole ratio of from 20 to 300 at a temperature between 80° C. and 250° C. in an aqueous solution containing 0.1 to 1 g, per gram of the ZSM-5 zeolite, of an alkali metal hydroxide.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 9
Dependent Claim
33 words
The process of claim 6 wherein the heating is carried out until the weight ratio of the formed zeolite to the starting zeolite ZSM-5 is in the range of from 10 to 80.
Claim 10
Dependent Claim
26 words
The process of claim 6 wherein the alkali metal hydroxide is used in the amount of 0.2 to 0.7 g per gram of the zeolite ZSM-5.
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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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |