US4331694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of caffeine by selective adsorption using zeolite adsorbents
Assignee: Katalistiks International Inc
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Filing: 1980-08-13
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Granted: 1982-05-25
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Expires: 2000-08-13
Abstract
Abstract Caffeine is selectively adsorbed from aqueous solutions such as coffee and tea by contact with a particular form of zeolites created by high temperature rigorous steaming of a low sodium form of zeolite Y.
Inventors
- 👤 Thomas P. J. Izod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:48
CPC Classifications
A; A23; A23F; A23F3/00; A23F3/36; A23F3/38; A23F3/385; A23F5/00; A23F5/20; A23F5/22; A23F5/223; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
Process for removing caffeine from aqueous solutions which comprises contacting in the liquid phase at a temperature of not more than 100° C. an aqueous solution containing at least 0.01 weight percent caffeine dissolved therein with a crystalline zeolitic molecular sieve having a SiO 2 /Al 2 O 3 molar ratio of from 4.5 to 35, the essential X-ray powder diffraction pattern of zeolite Y, and ion-exchange capacity of not greater than 0.070, a unit cell dimension, a o , of from 24.20 to 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25° C. and a p/p o value of 0.10 of less than 5.00 weight percent, and a Residual Butanol Test value of not more than 0.40 weight percent, whereby caffeine is adsorbed on said zeolite, and thereafter isolating the said zeolite from said aqueous solution.
Claim 2
Dependent Claim
147 words
Process for removing caffeine from aqueous solutions which comprises contacting in the liquid phase at a temperature of not more than 100° C. an aqueous solution containing at least 0.01 weight percent caffeine dissolved therein with a crystalline zeolitic molecular sieve having a SiO 2 /Al 2 O 3 molar ratio of from 4.5 to 35, the essential X-ray powder diffraction pattern of zeolite Y, and ion-exchange capacity of not greater than 0.070, a unit cell dimension, a o , of from 24.20 to 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25° C. and a p/p o value of 0.10 of less than 5.00 weight percent, and a Residual Butanol Test value of not more than 0.40 weight percent, whereby caffeine is adsorbed on said zeolite, and thereafter isolating the said zeolite from said aqueous solution.
Claim 3
Dependent Claim
23 words
Process according to claim 1 wherein the SiO 2 /Al 2 O 3 molar ratio of the zeolite is from 4.5 to 9.0.
Claim 4
Dependent Claim
38 words
Process according to claim 1 which includes the further step of desorbing at least a portion of the caffeine from the zeolite containing same by contacting the zeolite with ethanol at a temperature of at least 20° C.
Claim 5
Dependent Claim
23 words
Process according to claim 3 wherein the ethanol is in the form of an aqueous solution containing at least 5 weight percent ethanol.
Claim 6
Dependent Claim
18 words
Process according to claim 4 wherein the aqueous solution of ethanol contains at least 10 weight percent ethanol.
Claim 7
Dependent Claim
19 words
Process according to claim 1 wherein the aqueous solution of caffeine is the aqueous extract of green coffee beans.
Claim 8
Dependent Claim
18 words
Process according to claim 1 wherein the aqueous solution of caffeine is an extract of roasted coffee beans.
Claim 9
Dependent Claim
23 words
Process according to claim 1 wherein the caffeine content of the aqueous solution being treated to remove caffeine is above 0.1 weight percent.
References Cited (Backward Citations)
US2309092A
Cited
US2391981A
Cited
US2375550A
Cited
US4031251A
Cited
US4113887A
Cited
US4113888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |