US4784982A
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Composite phylosilicate adsorbent and process for preparation thereof
Assignee: Mizusawa Industrial Chemicals Ltd
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Filing: 1988-02-26
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Granted: 1988-11-15
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Expires: 2008-02-26
Abstract
Abstract Disclosed is a composite body comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of the silica or silica-alumina. This composite phylosilicate is obtained by reacting a water-soluble silicate, a water-soluble zinc salt or magnesium salt and a water-soluble aluminum salt or aluminate in an aqueous medium containing a sol or gel of silica or silica-alumina. This composite phylosilicate has a large specific surface area and a large pore volume and has both the properties of a solid acid and the properties of a solid base.
Inventors
- 👤 Kouichi Usui
- 👤 Masahide Ogawa
- 👤 Osamu Okumura
- 👤 Teiji Sato
- 👤 Kouichi Yamada
- 👤 Masanori Tanaka
- 👤 Noriyuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
153 words
A composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina and having, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO 2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al 2 O 3 of 1 to 60 mole%, an X-ray diffraction pattern in which there is no substantial peak at a spacing dx of 8.40 to 6.40 Å and there are peaks at a spacing dx of 2.71 to 2.56 Å and a spacing dx of 1.56 to 1.52 Å, a specific surface area of at least 200 m 2 /g, and a pore volume of at least 0.25 cc/g in pores having a pore diameter of 10 to 300 Å.
Claim 2
Dependent Claim
153 words
A composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina and having, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO 2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al 2 O 3 of 1 to 60 mole%, an X-ray diffraction pattern in which there is no substantial peak at a spacing dx of 8.40 to 6.40 Å and there are peaks at a spacing dx of 2.71 to 2.56 Å and a spacing dx of 1.56 to 1.52 Å, a specific surface area of at least 200 m 2 /g, and a pore volume of at least 0.25 cc/g in pores having a pore diameter of 10 to 300 Å.
Claim 3
Dependent Claim
27 words
A composite phylosilicate as set forth in claim 1, which has substantially the same X-ray diffraction pattern as that shown in FIG. 1 of the accompanying drawings.
Claim 4
Dependent Claim
15 words
A composite phylosilicate as set forth in claim 1, wherein the aluminum-containing phylosilicate is fraipontite.
Claim 5
Dependent Claim
36 words
A composite phylosilicate as set forth in claim 1, wherein the aluminum-containing phylosilicate has a chemical structure represented by the following formula: (Zn.sub.3-x Al.sub.x)(Si.sub.2-x Al.sub.x)O.sub.5 (OH) wherein x is a number of from 0.1 to 1.75.
Claim 6
Dependent Claim
56 words
A composite phylosilicate as set forth in claim 1, which has, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO 2 of 25 to 65 mole%, MO (M is an atom selected from zinc and magnesium) of 15 to 60 mole% and Al 2 O 3 of 2 to 50 mole%.
Claim 7
Dependent Claim
17 words
A composite phylosilicate as set forth in claim 1, wherein the divalent metal M is zinc alone.
Claim 8
Dependent Claim
27 words
A composite phylosilicate as set forth in claim 1, wherein the divalent metal M comprises zinc and magnesium at an atomic ratio of from 95/5 to 50/50.
Claim 9
Dependent Claim
17 words
A composite phylosilicate as set forth in claim 1, which has a Hunter whiteness higher than 90%.
Claim 10
Dependent Claim
34 words
A composite phylosilicate as set forth in claim 1, wherein the amorphous and porous silica or silica-alumina is present in an amount of 10 to 70% by weight based on the whole composite phylosilicate.
Claim 11
Dependent Claim
12 words
An adsorbent comprising a composite phylosilicate as set forth in claim 1.
Claim 12
Dependent Claim
144 words
A process for the preparation of a composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina as the carrier, said process comprising adding a water-soluble silica silicate, a water-soluble zinc salt and/or a water-soluble magnesium salt, and a water-soluble aluminum salt and/or a water-soluble aluminate to an aqueous medium containing a dispersion of a sol or gel of silica or silica-alumina to produce, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO 2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al 2 O 3 of 1 to 60 mole%, and reacting the added salts in the presence of said silica or silica-alumina.
Claim 13
Dependent Claim
144 words
A process for the preparation of a composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina as the carrier, said process comprising adding a water-soluble silica silicate, a water-soluble zinc salt and/or a water-soluble magnesium salt, and a water-soluble aluminum salt and/or a water-soluble aluminate to an aqueous medium containing a dispersion of a sol or gel of silica or silica-alumina to produce, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO 2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al 2 O 3 of 1 to 60 mole%, and reacting the added salts in the presence of said silica or silica-alumina.
Claim 14
Dependent Claim
35 words
A preparation process according to claim 11, wherein the dispersion of the sol or gel of silica or silica-alumina has a specific surface area of at least 200 m 2 /g in the dry state.
Claim 15
Dependent Claim
29 words
A preparation process according to claim 11, wherein the dispersion of the sol or gel of silica-alumina contains up to 80% by weight of Al 2 O 3 .
Claim 16
Dependent Claim
35 words
A preparation process according to claim 11, wherein the dispersion of the sol or gel of silica or silica-alumina is used as an amount of 10 to 70% by weight based on the composite phylosilicate.
Claim 17
Dependent Claim
25 words
A preparation process according to claim 11, wherein the solid concentration of silica or silica-alumina in the aqueous medium is 1 to 20% by weight.
Claim 18
Dependent Claim
26 words
A preparation process according to claim 11, wherein the reaction is carried out at a temperature in the range of from room temperature to 100° C.
Claim 19
Dependent Claim
22 words
A preparation process according to claim 11, wherein the reaction is carried out at a pH value of from 5 to 10.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |