US5601798A
Expired / Lapsed
US
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Process for preparing zeolite Y with increased mesopore volume
Assignee: PQ Corp
•
Filing: 1994-08-30
•
Granted: 1997-02-11
•
Expires: 2014-08-30
Abstract
Abstract The mesopore volume in pores of diameters ranging from 2 to 60 nm of zeolite Y materials is increased by the hydrothermal treatment of such zeolites at temperatures above the atmospheric boiling point of the treating solution. Unique zeolites are produced as result of such process.
Inventors
- 👤 David A. Cooper
- 👤 Thomas W. Hastings
- 👤 Elliot P. Hertzenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:10
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084; C; C01; C01B; C01B39/00; C01B39/02; C01B39/026; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
90 words
A stabilized zeolite having the structure of zeolite Y and mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter wherein the relationship between the SiO 2 /Al 2 O 3 molar ratio ("SAR"), the unit cell constant, a 0 , and mesopore volume is defined by the following table: ______________________________________
SiO.sub.2 /AlO.sub.3
Zeolite
Molar Unit Cell Mesopore
Type Ratio Constant(Å)
Volume (cc/g)
______________________________________
USY 5-10 24.6 ≧ a.sub.o ≧ 24.5
0.202 or greater
VUSY 5-15 24.5 > a.sub.o ≧ 24.3
0.313 or greater.
______________________________________
Claim 2
Dependent Claim
90 words
A stabilized zeolite having the structure of zeolite Y and mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter wherein the relationship between the SiO 2 /Al 2 O 3 molar ratio ("SAR"), the unit cell constant, a 0 , and mesopore volume is defined by the following table: ______________________________________
SiO.sub.2 /AlO.sub.3
Zeolite
Molar Unit Cell Mesopore
Type Ratio Constant(Å)
Volume (cc/g)
______________________________________
USY 5-10 24.6 ≧ a.sub.o ≧ 24.5
0.202 or greater
VUSY 5-15 24.5 > a.sub.o ≧ 24.3
0.313 or greater.
______________________________________
Claim 3
Dependent Claim
11 words
The zeolite of claim 1 wherein the zeolite type is USY.
Claim 4
Dependent Claim
17 words
The zeolite of claim 2 wherein the mesopore volume ranges from about 0.2 to about 0.6 cc/g.
Claim 5
Dependent Claim
11 words
The zeolite of claim 1 wherein the zeolite type is VUSY.
Claim 6
Dependent Claim
164 words
A process for increasing the mesopore volume contained in mesopores having diameters of about 2 nm to about 60 nm of a stabilized zeolite having the structure of zeolite Y to produce a zeolite having the structure of zeolite Y and mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter, said process comprising: contacting hydrothermally said stabilized zeolite with an aqueous solution, having dissolved therein one or more salts, acids, bases, and/or water-soluble organic compounds, such contacting being made at a temperature above the atmospheric boiling point of the solution for a period of time from about 2 hours or more thereby producing a stabilized zeolite having the structure of zeolite Y and a mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter in the product zeolite of at least 5 percent greater than the mesopore volume of the zeolite prior to said contact, then separating, washing and recovering the product zeolite.
Claim 7
Dependent Claim
164 words
A process for increasing the mesopore volume contained in mesopores having diameters of about 2 nm to about 60 nm of a stabilized zeolite having the structure of zeolite Y to produce a zeolite having the structure of zeolite Y and mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter, said process comprising: contacting hydrothermally said stabilized zeolite with an aqueous solution, having dissolved therein one or more salts, acids, bases, and/or water-soluble organic compounds, such contacting being made at a temperature above the atmospheric boiling point of the solution for a period of time from about 2 hours or more thereby producing a stabilized zeolite having the structure of zeolite Y and a mesopore volume contained in mesopores of about 2 nm to about 60 nm in diameter in the product zeolite of at least 5 percent greater than the mesopore volume of the zeolite prior to said contact, then separating, washing and recovering the product zeolite.
Claim 8
Dependent Claim
24 words
The process of claim 5 wherein the stabilized zeolite is USY having SiO 2 /Al 2 O 3 molar ratio of 5 to 10.
Claim 9
Dependent Claim
24 words
The process of claim 5 wherein the stabilized zeolite is VUSY having SiO 2 /Al 2 O 3 molar ratio of 5 to 15.
Claim 10
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is 10 or less.
Claim 11
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is 8 or less.
Claim 12
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is 7 or less.
Claim 13
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is 8 to 10.
Claim 14
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is 4.5 to 8.
Claim 15
Dependent Claim
17 words
The process of claim 5 wherein the pH of the hydrothermal treatment solution is less than 4.5.
Claim 16
Dependent Claim
15 words
The process of claim 5 wherein the salt is an alkali metal or ammonium salt.
Claim 17
Dependent Claim
13 words
The process of claim 5 wherein the acid is a strong inorganic acid.
Claim 18
Dependent Claim
11 words
The process of claim 5 wherein the acid is nitric acid.
Claim 19
Dependent Claim
15 words
The process of claim 16 wherein the salt is an alkali metal or ammonium nitrate.
Claim 20
Dependent Claim
17 words
The process of claim 5 wherein the time ranges from about 2 hours to about 20 hours.
Claim 21
Dependent Claim
35 words
The process of claim 5 wherein the time is sufficient to produce a product zeolite having a mesopore volume of at least 10% greater than the mesopore volume of the zeolite prior to said contact.
Claim 22
Dependent Claim
13 words
The process of claim 5 wherein the temperature is 115° C. or greater.
Claim 23
Dependent Claim
15 words
The process of claim 20 wherein the temperature ranges from 115° C. to 250° C.
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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) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |