US3869409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a wide-pore adsorbent for use in chromatography
Assignee: Individual
•
Filing: 1972-06-08
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Granted: 1975-03-04
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Expires: 1992-06-08
Abstract
Abstract A process for preparing a wide-pore adsorbent for chromatography comprising preparing a suspension of a fine disperse non-porous silica having a specific surface area S of from 30 to 380 m2/g. while modifying the silica surface. At this stage of the suspension preparation water is employed as a dispersion medium, while as a modifying component use is made of an alkali, a salt of an alkali or alkali-earth metal, or carbon black, or an organic solvent is employed as a liquid dispersion medium, while as a modifying component use is made of polyphenyldisiloxane or a polycondensation product of phenolphthalein and phthalic acid. Said suspension is subjected to drying at a temperature of from 15 to 200*C. The resulting silica xerogel is ground. The process according to the present invention makes it possbile to vary, within broad limits; adsorptive and chromatographic properties of the adsorbent being produced and to regulate, over a wide range, its selectivity. This, in turn, enables the use of the adsorbent for seperating mixtures of organic compounds of different classes.
Inventors
- 👤 Natalya Karlovna Bebris
- 👤 Andrei Vladimirovich Kiselev
- 👤 Jury Stepanovich Nikitin
- 👤 Yakov Ivanovich Yashin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:01
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A PROCESS FOR PREPARING A WIDE-PORE SILICON-CONTAINING ADSORBENT FOR CHROMATOGRAPHY, COMPRISING PREPARING A SUSPENSION OF A FINELY DISPERSED NON-POROUS SILICA HAVING A SPECIFIC SURFACE 30 TO 380 M2/G IN A SUITABLE LIQUID DISPERSION MEDIUM CONTAINING OF ALKALI METAL SALTS, ALKALINE-EARTH GROUP CONSISTING OF ALKALIS, ALKALI METAL SALTS, ALKALINE-EARTH METAL SALTS, CARBON BLACK, POLYPHENYLDISILOXANE, AND A CONDENSATION PRODUCT OF PHENOLPHTHALEIN AND PHTHALIC ACID; AND DRYING SAID SUSPENSION AT A TEMPERATURE OF ABOUT 15* TO 200*C TO FORM A SILICA XEROGEL.
Claim 2
Dependent Claim
79 words
A PROCESS FOR PREPARING A WIDE-PORE SILICON-CONTAINING ADSORBENT FOR CHROMATOGRAPHY, COMPRISING PREPARING A SUSPENSION OF A FINELY DISPERSED NON-POROUS SILICA HAVING A SPECIFIC SURFACE 30 TO 380 M2/G IN A SUITABLE LIQUID DISPERSION MEDIUM CONTAINING OF ALKALI METAL SALTS, ALKALINE-EARTH GROUP CONSISTING OF ALKALIS, ALKALI METAL SALTS, ALKALINE-EARTH METAL SALTS, CARBON BLACK, POLYPHENYLDISILOXANE, AND A CONDENSATION PRODUCT OF PHENOLPHTHALEIN AND PHTHALIC ACID; AND DRYING SAID SUSPENSION AT A TEMPERATURE OF ABOUT 15* TO 200*C TO FORM A SILICA XEROGEL.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein the liquid dispersion medium is water.
Claim 4
Dependent Claim
38 words
A process according to claim 1, wherein the dried silica xerogel is calcined in an atmosphere of a gas selected from the group consisting of air and an inert gas at a temperature of from 250*C. to 900*C.
Claim 5
Dependent Claim
14 words
A process according to claim 3, wherein the calcined product is subjected to grinding.
Claim 6
Dependent Claim
27 words
A process according to claim 1, wherein the modifying component is present in the amount of 1-40 per cent by weight of the weight of said silica.
Claim 7
Dependent Claim
40 words
A process according to claim 5, wherein the resultant silica xerogel is calcined in an atmosphere of a gas selected from the group consisting of air and an inert gas at a temperature of from 250*C. to 900*C. and ground.
Claim 8
Dependent Claim
62 words
A process according to cliam 1, wherein the modifying component is carbon black in an amount of 1-60 per cent by weight of the weight of said silica and the resultant silica xerogel is calcined in an atmosphere of a gas selected from the group consisting of air and an inert gas at a temperature of from 250*C. to 900*C. and ground.
Claim 9
Dependent Claim
62 words
A process according to cliam 1, wherein the modifying component is carbon black in an amount of 1-60 per cent by weight of the weight of said silica and the resultant silica xerogel is calcined in an atmosphere of a gas selected from the group consisting of air and an inert gas at a temperature of from 250*C. to 900*C. and ground.
Claim 10
Dependent Claim
76 words
A process according to claim 1, wherein said liquid dispersion medium is a suitable organic solvent and said modifying component is selected from the group consisting of polyphenyldisiloxane and a polycondensation product of phenolphthalein and phthalic acid, said modifying component being present in the resulting suspension in an amount of from 2 to 10 per cent based on the weight of silica, said suspension being subjected to drying at a temperature of from 15*C. to 200*C.
Claim 11
Dependent Claim
38 words
A process according to claim 8, wherein the resultant silica xerogel is calcined in an atmosphere of a gas selected from the group consisting of air and an inert gas at a temperature of from 250*C. to 300*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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |