US4522920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ethanol
Assignee: Alfa Laval AB
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Filing: 1982-08-16
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Granted: 1985-06-11
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Expires: 2002-08-16
Abstract
Abstract A flow of fermenting liquor from a fermentor is separated into a yeast concentrate flow, which is recirculated to the fermentor, and a yeast-free flow which is separated in a simple evaporator unit into a first ethanol-enriched vapor flow and a first liquid bottom flow. The first vapor flow is treated to produce the desired ethanol while a major part of the first liquid bottom flow is recirculated to the fermentor. A minor, residual part of the latter flow is fed to a stripping unit where it is separated into a second ethanol-enriched vapor flow and a second liquid bottom flow exhausted of ethanol.
Inventors
- 👤 Conny R. Thorsson
- 👤 Indrek J. Viira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:36
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/02; C12P7/04; C12P7/06; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y10; Y10S; Y10S203/00; Y10S203/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
153 words
In the production of ethanol from a substrate containing carbohydrate, the method which comprises the continuous steps of delivering the substrate to a fermentor to provide a fermenting liquor, feeding a flow of said liquor from the fermentor to a separating unit and there separating the liquor into a yeast concentrate flow and a yeast-free flow, recirculating said yeast concentrate flow to the fermentor, feeding said yeast-free flow to a short distillation column and there separating it into a first ethanol-enriched vapor flow and a first liquid bottom flow, treating said first vapor flow to produce ethanol of a desired quality, recirculating a major part of said first liquid bottom flow to the fermentor, feeding a minor residual part of said first liquid bottom flow to a stripping unit, and separating said residual part in the stripping unit into a second ethanol-enriched vapor flow and a second liquid bottom flow, exhausted of ethanol.
Claim 2
Dependent Claim
153 words
In the production of ethanol from a substrate containing carbohydrate, the method which comprises the continuous steps of delivering the substrate to a fermentor to provide a fermenting liquor, feeding a flow of said liquor from the fermentor to a separating unit and there separating the liquor into a yeast concentrate flow and a yeast-free flow, recirculating said yeast concentrate flow to the fermentor, feeding said yeast-free flow to a short distillation column and there separating it into a first ethanol-enriched vapor flow and a first liquid bottom flow, treating said first vapor flow to produce ethanol of a desired quality, recirculating a major part of said first liquid bottom flow to the fermentor, feeding a minor residual part of said first liquid bottom flow to a stripping unit, and separating said residual part in the stripping unit into a second ethanol-enriched vapor flow and a second liquid bottom flow, exhausted of ethanol.
Claim 3
Dependent Claim
23 words
The method of claim 1, comprising also feeding at least a major part of said second ethanol-enriched vapor flow to said distillation column.
Claim 4
Dependent Claim
23 words
The method of claim 1, comprising also combining at least part of said second ethanol-enriched vapor flow with said first ethanol-enriched vapor flow.
Claim 5
Dependent Claim
46 words
The method of claim 1, in which said first vapor flow is treated in a rectifying column to produce said ethanol of a desired quality, the method comprising also feeding at least part of said second vapor flow to said rectifying column as a heating medium.
Claim 6
Dependent Claim
57 words
The method of claim 1, in which said first vapor flow is treated in a rectifying column to produce said ethanol of a desired quality, the method comprising also feeding at least part of at least one of said first and second vapor flows to a thermo compressor, and heating said rectifying column by said thermo compressor.
Claim 7
Dependent Claim
45 words
The method of claim 1, in which said treating of said first vapor flow includes at least part of it to the lowest distilling stage in a rectifying column, the method comprising also recirculating a liquid flow from said lowest stage to the distillation column.
Claim 8
Dependent Claim
28 words
The method of claim 1, in which the energy for the separation in said distillation column is supplied at least partly in the form of external live steam.
Claim 9
Dependent Claim
26 words
The method of claim 1, in which at least part of the energy for the separation in said distillation column is supplied indirectly by heat exchange.
Claim 10
Dependent Claim
15 words
The method of claim 8, in which external steam is used for said heat exchange.
Claim 11
Dependent Claim
45 words
The method of claim 1, in which said stripping unit includes a plurality of evaporator stages coupled in series, the vapor flow from one evaporator stage being fed to the previous stage while the bottom flow from said stage is fed to said one stage.
Claim 12
Dependent Claim
19 words
The method of claim 1, in which at least one of said separations if performed at substantially atmospheric pressure.
Claim 13
Dependent Claim
18 words
The method of claim 1, in which at least one of said separations is performed at subatmospheric pressure.
Claim 14
Dependent Claim
124 words
The method of claim 1 in which said distillation column and said stripping unit are combined in a single column, said yeast-free flow being fed to the upper portion of the single column, where the distillation column is located, said first liquid bottom flow being discharged from the single column at a level located at the lower portion of the distillation column and being divided to form said major part and said minor residual part, said minor residual part of said first bottom flow being fed to the lower portion of said single column where said stripping unit is located, said second ethanol-enriched vapor flow passing upwardly in said lower portion of the single column and leaving the stripping unit at about said level.
Claim 15
Dependent Claim
23 words
The method of claim 13 in which said second ethanol-enriched vapor flow is passed directly through said level and into the distillation column.
References Cited (Backward Citations)
US504074A
Cited
US1912010A
Cited
US2010929A
Cited
US2127138A
Cited
US2152164A
Cited
US2155134A
Cited
US2372854A
Cited
US2358272A
Cited
US2440925A
Cited
US2698826A
Cited
US2892757A
Cited
US3884770A
Cited
US4358536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |