# US 7,608,438 B2 · Process for the continuous production of ethanol

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- Number: US 7,608,438 B2
- Document ID: US7608438B2
- Status: Granted
- Kind: B2
- Application number: 11/654,913
- Filed: 2007-01-18
- Published: 2007-08-02
- Granted: 2009-10-27
- Earliest claimed: 2005-04-05
- Inventors: Jessica Laviolette
- Web page: https://patentgrep.com/patent/US7608438B2

## CPC

- C12P 7/06: Ethanol, i.e. non-beverage
- Y02E 50/10: Biofuels, e.g. bio-diesel
- C12P: FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE {(brewing of beer C12C; producing vinegar C12J; producing specific peptides or proteins C07K; producing enzymes C12N9/00; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification C12N15/00; measuring or testing processes involving enzymes or microorganisms C12Q; measuring or testing processes involving nucleic acid amplification reactions C12Q1/6844; fermentation processes to form a food composition, A21 or A23; compounds in general, see the relevant compound class, e.g. C01, C07)}
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A process for the production of ethanol utilizes a vacuum process and selectively permeable membranes to increase ethanol production efficiency. Yeast converts sugars to ethanol in an anaerobic condition within process chamber void of oxygen and filled with a Nitrogen gas (N2) or any non-oxygen containing gas. A glucose solution is fed into the process chamber to a yeast solution to ferment. A selectively permeable membrane filters ethanol away from the yeast and out of the process chamber. The removal of ethanol from the process chamber keeps the yeast alive to constantly produce ethanol.

## Claims

### Claim 1

A method of continuously producing ethanol comprising the steps of:
a) creating an oxygen free environment within a closed process chamber;
b) supporting an ethanol producing yeast within the closed process chamber;
c) introducing a glucose solution into the process chamber for reaction with the ethanol producing yeast; and
d) removing ethanol produced during fermentation from the process chamber through a selectively permeable membrane to control a concentration of ethanol within the process chamber; wherein the selectively permeable membrane provides for ethanol to flow therethrough, and prevents the flow of yeast therethrough and wherein the concentration of ethanol within the process chamber is controlled such that the concentration of ethanol does not exceed a concentration determined to denature the ethanol producing yeast.

### Claim 2 (depends on 1)

The method as recited in claim 1, wherein step a comprises removing oxygen from the process chamber with a vacuum.

### Claim 3 (depends on 1)

The method as recited in claim 1, wherein the selectively permeable membrane provides for the flow of at least some of the glucose solution out of the process chamber.

### Claim 4 (depends on 1)

The method as recited in claim 1, including the step of controlling the flow of ethanol through the selectively permeable membrane to maintain a desired concentration of ethanol within the process chamber.

### Claim 5 (depends on 1)

The method as recited in claim 1, wherein step c includes controlling the flow of the glucose solution into the process chamber for controlling alcoholic fermentation.

### Claim 6 (depends on 1)

The method as recited in claim 1, wherein the selectively permeable membrane includes a plurality of pores.

### Claim 7 (depends on 1)

The method as recited in claim 1, wherein step a comprises filling the process chamber with a non-oxygen containing gas.

### Claim 8 (depends on 7)

The method as recited in claim 7, wherein the non-oxygen containing gas comprises Nitrogen gas.

### Claim 9 (depends on 1)

The method as recited in claim 1, wherein step c includes flowing glucose solution into the process chamber, and out of the process chamber through the selectively permeable membrane.

### Claim 10 (depends on 1)

The method as recited in claim 1, including the step of maintaining the ethanol producing yeast within the process chamber.

### Claim 11 (depends on 1)

The method as recited in claim 1, wherein the concentration of ethanol within the process chamber is controlled such that the concentration of ethanol to the ethanol producing yeast does not exceed 20%.