US4507329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed solvent extraction of hops
Assignee: Steiner S S Inc
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Filing: 1982-02-03
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Granted: 1985-03-26
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Expires: 2002-02-03
Abstract
Abstract An improved process for the selective extraction of the alpha acids contents of hops using liquid carbon dioxide as solvent is described. Solubility of the alpha acids in liquid carbon dioxide is enhanced by addition of a minor amount of a selected organic substance which: (1) is non-reactive with the alpha acids of interest, and (2) has the following physical properties: (a) is completely soluble in liquid carbon dioxide in the operating conditions and concentrations employed, and (b) is itself a solvent for the alpha acids of interest. Preferably the organic substance is a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about 30 volume percent.
Inventors
- 👤 Herbert L. Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
C; C12; C12C; C12C3/00; C12C3/04; C12C3/08; C12C3/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
A method for the selective extraction of alpha acids from hops, which method comprises the steps of: (A) contacting hops with a solvent mixture comprising liquid carbon dioxide in major volume proportion, and containing a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide in the operating conditions and concentrations employed, and (b) is itself a solvent for said alpha acids of interest, and (B) separating said solvent mixture containing dissolved alpha acids from said hops.
Claim 2
Independent Claim
114 words
A method for the selective extraction of alpha acids from hops, which method comprises the steps of: (A) contacting hops with a solvent mixture comprising liquid carbon dioxide in major volume proportion, and containing a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide in the operating conditions and concentrations employed, and (b) is itself a solvent for said alpha acids of interest, and (B) separating said solvent mixture containing dissolved alpha acids from said hops.
Claim 3
Dependent Claim
18 words
A method according to claim 1, including the step of recovering said alpha acids from said solvent mixture.
Claim 4
Dependent Claim
29 words
A method according to claim 1, wherein said aliphatic alcohol is present in said solvent mixture in amount in the range of about 0.1 to about ten volume percent.
Claim 5
Dependent Claim
12 words
A method according to claim 1 wherein said aliphatic alcohol comprises ethanol.
Claim 6
Dependent Claim
110 words
In a method for the selective solvent extraction of alpha acids from hops by contacting said hops with liquid carbon dioxide, the improvement which comprises enhancing the solubility of said alpha acids in said liquid carbon dioxide by conducting said extraction in the presence of a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide in the operating conditions and concentration employed, and (b) is itself a solvent for said alpha acids.
Claim 7
Dependent Claim
110 words
In a method for the selective solvent extraction of alpha acids from hops by contacting said hops with liquid carbon dioxide, the improvement which comprises enhancing the solubility of said alpha acids in said liquid carbon dioxide by conducting said extraction in the presence of a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide in the operating conditions and concentration employed, and (b) is itself a solvent for said alpha acids.
Claim 8
Dependent Claim
20 words
In a method according to claim 5, and including the step of recovering said alpha acids from said solvent mixture.
Claim 9
Dependent Claim
25 words
In a method according to claim 5, and including the step of adding said aliphatic alcohol to said liquid carbon dioxide prior to said extraction.
Claim 10
Dependent Claim
37 words
In a method according to claim 5, and including the step of admixing said aliphatic alcohol with said hops to form a wet mash thereof, and then extracting the resulting wet mash with said liquid carbon dioxide.
Claim 11
Dependent Claim
15 words
In a method according to claim 5, the improvement wherein said aliphatic alcohol comprises ethanol.
Claim 12
Dependent Claim
81 words
A hop extract of alpha acids in a solvent mixture which comprises liquid carbon dioxide in a major volume proportion, and containing, a 1 to 4 carbon atom aliphatic alcohol in an amount of from about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide, and (b) is itself a solvent for said alpha acids.
Claim 13
Dependent Claim
81 words
A hop extract of alpha acids in a solvent mixture which comprises liquid carbon dioxide in a major volume proportion, and containing, a 1 to 4 carbon atom aliphatic alcohol in an amount of from about 0.1 to about thirty volume percent of said solvent mixture, which alcohol: (1) is non-reactive with said alpha acids, and (2) has the following physical properties: (a) is completely soluble in said liquid carbon dioxide, and (b) is itself a solvent for said alpha acids.
Claim 14
Dependent Claim
31 words
A hop extract according to claim 10, wherein said aliphatic alcohol is present in an amount in the range of about 0.1 to about ten volume percent of said solvent mixture.
Claim 15
Dependent Claim
13 words
A hop extract according to claim 10 wherein said aliphatic alcohol comprises ethanol.
References Cited (Backward Citations)
US2191838A
Cited
US3433642A
Cited
US3607298A
Cited
GB1388581A
Cited
US4104409A
Cited
US3787499A
Cited
US3798332A
Cited
US4212895A
Cited
US4218491A
Cited
GB1597703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |