US4089929A
Expired / Lapsed
US
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Process for the production of low-iron zeolitic aluminosilicates
Assignee: Henkel AG and Co KGaA
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Filing: 1977-07-28
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Granted: 1978-05-16
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Expires: 1997-07-28
Abstract
Abstract A process for the production of a low-iron zeolitic alkali metal aluminosilicate from iron-containing, optionally previously activated, mineral aluminosilicate raw materials comprising subjecting the iron-containing, optionally previously activated, mineral aluminosilicate raw material in a charge of suitable molar ratios of M.sub.2 O : Al.sub.2 O.sub.3 : SiO.sub.2 : H.sub.2 O where M is an alkali metal, by addition to the charge of sufficient caustic alkalis and optionally alkali metal silicate to give the desired molar ratio, to a hydrothermal crystallization treatment in the presence of an excess of alkali metal hydroxide to give a highly alkaline solution and sufficient of a water-soluble trialkanolamine to reduce the iron content of the crystalline zeolitic aluminosilicate formed, and recovering a low-iron zeolitic alkali metal aluminosilicate.
Inventors
- 👤 Peter Christophliemk
- 👤 Karl-Heinz Worms
- 👤 Gerald Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:47
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
A process for the production of a low-iron zeolitic alkali metal aluminosilicate from iron-containing, optionally previously activated, mineral aluminosilicate raw materials comprising subjecting the iron-containing, optionally previously activated, mineral aluminosilicate raw material in a charge of suitable molar ratios of M.sub.2 O : Al.sub.2 O.sub.3 : SiO.sub.2 : H.sub.2 O where M is an alkali metal, by addition to the charge of sufficient caustic alkalis and optionally alkali metal silicate to give the desired molar ratio, to a hydrothermal crystallization treatment in the presence of an excess of alkali metal hydroxide to give a highly alkaline solution and sufficient of a water-soluble trialkanolamine to reduce the iron content of the crystalline zeolitic aluminosilicate formed, and recovering a low-iron zeolitic alkali metal aluminosilicate.
Claim 2
Dependent Claim
122 words
A process for the production of a low-iron zeolitic alkali metal aluminosilicate from iron-containing, optionally previously activated, mineral aluminosilicate raw materials comprising subjecting the iron-containing, optionally previously activated, mineral aluminosilicate raw material in a charge of suitable molar ratios of M.sub.2 O : Al.sub.2 O.sub.3 : SiO.sub.2 : H.sub.2 O where M is an alkali metal, by addition to the charge of sufficient caustic alkalis and optionally alkali metal silicate to give the desired molar ratio, to a hydrothermal crystallization treatment in the presence of an excess of alkali metal hydroxide to give a highly alkaline solution and sufficient of a water-soluble trialkanolamine to reduce the iron content of the crystalline zeolitic aluminosilicate formed, and recovering a low-iron zeolitic alkali metal aluminosilicate.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said water-soluble trialkanolamine is employed in an amount of from 1% to 100% by weight, based on the mineral aluminosilicate raw material employed.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said water-soluble trialkanolamine is employed in an amount of from 3% to 50% by weight, based on the mineral aluminosilicate raw material employed.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein said water-soluble trialkanolamine has from 2 to 4 carbon atoms in the alkanol group.
Claim 6
Dependent Claim
10 words
The process of claim 4 wherein said trialkanolamine is triethanolamine.
Claim 7
Dependent Claim
10 words
The process of claim 4 wherein said trialkanolamine is triisopropanolamine.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said hydrothermal treatment is conducted at temperatures above 70° C.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein said excess of alkali metal hydroxide is at least 5% based on the water content of the charge.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein said excess of alkali metal hydroxide is at least 10% based on the water content of the charge.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein said mineral aluminosilicate raw materials are highly destructured metakaolins.
Claim 12
Dependent Claim
33 words
The process of claim 1 wherein said mineral aluminosilicate raw materials have an initial iron content of from about 0.2% to 0.9% on an anhydrous basis, calculated as Fe 2 O 3 .
Claim 13
Dependent Claim
32 words
The process of claim 1 wherein said mineral aluminosilicate raw materials have an initial iron content of from less than 0.6% on an anhydrous basis, calculated as Fe 2 O 3 .
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the mother liquor from the recovery step is recycled to the next charge.
Claim 15
Dependent Claim
21 words
The process of claim 1 wherein said low-iron zeolitic alkali metal aluminosilicate recovered is a sodium aluminosilicate of the NaA type.
Claim 16
Dependent Claim
21 words
The process of claim 1 wherein said low-iron zeolitic alkali metal aluminosilicate recovered is a sodium aluminosilicate of the NaX type.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein said low-iron zeolitic alkali metal aluminosilicate recovered is a sodium aluminosilicate of the cubic P type.
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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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |