US4687654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ZSM-5, large pore mordenite and ZSM-35
Assignee: SnamProgetti SpA
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Filing: 1985-08-05
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Granted: 1987-08-18
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Expires: 2005-08-05
Abstract
Abstract A process for preparing porous crystalline alumino-silicates consisting of bringing into contact, in an aqueous environment, sodium silicate with an aluminum derivative at a molar SiO 2 /Al 2 O 3 ratio greater than or equal to 8, in the presence of one or more alkaline hydroxides at a molar Me + /SiO 2 ratio greater than 0.6, where Me + represents the alkaline metal or metals, and in the presence of a mineralizing agent, operating at a temperature of between 20° and 100° C., and controlling the molar OH - /SiO 2 ratio of the resultant mixture at a value of 0.01 and 0.8, the resultant mixture being crystallized at said molar OH - /SiO 2 ratio in a closed environment for a period of between some hours and 40 days at a temperature of between 100° and 200° C.
Inventors
- 👤 Marco Taramasso, deceased
- 👤 Bruno Notari
- 👤 Giovanni Manara
- 👤 Giuseppe Bellussi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2861; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/23; Y10S423/25
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
176 words
A process for preparing porous crystalline aluminosilicates said process consisting of the steps of: (a) bringing into contact, in an aqueous environment and in the absence of organics, ammonia and ammoniacal substances, sodium silicate with an aluminum derivative at a molar SiO 2 /Al 2 O 3 ratio greater than or equal to 8, in the presence of one or more alkaline hydroxides at a molar Me + /SiO 2 ratio greater than 0.6, where Me + represents the alkaline metal or metals, and in the presence of a mineralizing agent selected from the group consisting of sodium sulphate, potassium sulphate, sodium phosphate, potassium phosphate, sodium chloride and potassium chloride, and (b) conducting the reaction at a temperature between 20° and 100° C. while controlling the molar OH - /SiO 2 ratio of the reaction mixture between 0.01 and 0.8, the resulting mixture being crystallized at said molar ratio of OH - /Si 2 in a closed environment for a period of between several hours and 40 days at a temperature between 100° and 200° C.
Claim 2
Dependent Claim
176 words
A process for preparing porous crystalline aluminosilicates said process consisting of the steps of: (a) bringing into contact, in an aqueous environment and in the absence of organics, ammonia and ammoniacal substances, sodium silicate with an aluminum derivative at a molar SiO 2 /Al 2 O 3 ratio greater than or equal to 8, in the presence of one or more alkaline hydroxides at a molar Me + /SiO 2 ratio greater than 0.6, where Me + represents the alkaline metal or metals, and in the presence of a mineralizing agent selected from the group consisting of sodium sulphate, potassium sulphate, sodium phosphate, potassium phosphate, sodium chloride and potassium chloride, and (b) conducting the reaction at a temperature between 20° and 100° C. while controlling the molar OH - /SiO 2 ratio of the reaction mixture between 0.01 and 0.8, the resulting mixture being crystallized at said molar ratio of OH - /Si 2 in a closed environment for a period of between several hours and 40 days at a temperature between 100° and 200° C.
Claim 3
Dependent Claim
25 words
A process for preparing porous crystalline alumino-silicates as claimed in claim 1, wherein the molar Me + /SiO 2 ratio lies between 0.66 and 0.96.
Claim 4
Dependent Claim
40 words
A process for preparing porous crystalline alumino-silicates as claimed in claim 1, wherein the molar SiO 2 /Al 2 O 3 ratio lies between 10 and 200, and the molar OH - /SiO 2 ratio lies between 0.2 and 0.8.
Claim 5
Dependent Claim
40 words
A process for preparing porous crystalline alumino-silicates as claimed in claim 1, wherein the molar SiO 2 /Al 2 O 3 ratio lies between 20 and 50, and the molar OH - /SiO 2 ratio lies between 0.05 and 0.30.
Claim 6
Dependent Claim
40 words
A process for preparing porous crystalline alumino-silicates as claimed in claim 1, wherein the molar SiO 2 /Al 2 O 3 ratio lies between 8 and 25, and the molar OH - /SiO 2 ratio lies between 0.01 and 0.25.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1, wherein the crystallization temperature lies between 150° and 180° C.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 1, wherein the alkaline hydroxides are selected from the group consisting of LiOH, NaOH and KOH.
Claim 9
Dependent Claim
27 words
A process as claimed in claim 1, wherein the aluminum derivative is selected from the group consisting of sodium aluminate, aluminum sulphate, aluminum chloride and alumina trihydrate.
Claim 10
Dependent Claim
48 words
A process as defined in claim 1 wherein ZSM-5 is prepared by using an SiO 2 /Al 2 O 3 ratio of 20-50; an Me + /SiO 2 ratio of >0.6; a H 2 O/SiO 2 ratio of 20-100 and an OH - /SiO 2 ratio of 0.05-0.30.
Claim 11
Dependent Claim
38 words
A process as defined in claim 9 wherein the ratios of SiO 2 /Al 2 O 3 are 25-40; Me + /SiO 2 are 0.66-0.96; H 2 O/SiO 2 are 30-50; and OH - /SiO 2 are 0.10-0.20.
Claim 12
Dependent Claim
48 words
A process as defined in claim 1 wherein ZSM-35 is prepared by using an SiO 2 /Al 2 O 3 ratios of 8-25; a Me + /SiO 2 ratio of >0.6; a H 2 O/SiO 2 ratio of 20-100; and a OH - /SiO 2 ratio of 0.01-0.25.
Claim 13
Dependent Claim
43 words
A process as defined in claim 11 wherein the SiO 2 /Al 2 O 3 ratio is 10-20; the Me + /SiO 2 ratio is 0.66-0.96; the H 2 O/SiO 2 ratio is 40-80 and the OH - /SiO 2 ratio is 0.05-0.12.
Claim 14
Dependent Claim
47 words
A process as defined in claim 1 wherein mordenite is prepared using a SiO 2 /Al 2 O 3 ratio of 10-200; a Me + /SiO 2 ratio of >0.6; a H 2 O/SiO 2 ratio of 10-100; and a OH - /SiO 2 ratio of 0.2-0.80.
Claim 15
Dependent Claim
44 words
A process as defined in claim 13 wherein the ratio of SiO 2 /Al 2 O 3 is 15-100; the Me + SiO 2 ratio is 0.66-0.96; the H 2 O/SiO 2 ratio is 20-40; and the OH - /SiO 2 ratio is 0.25-0.50.
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |