Source: http://www.google.com/patents/US7507562
Timestamp: 2014-11-28 04:43:15
Document Index: 636332905

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 07008768', 'Application No. 00917888', 'Application No. 07008768', 'Application No. 514253', 'Application No. 514253', 'Application No. 2004200701', 'Application No. 38794', 'Application No. 2004200701', 'Application No. 38794', 'Application No. 2004200701', 'Application No. 38794', 'Application No. 00804895', 'Application No. 00917888', 'Application No. 00917888', 'Application No. 200580008137']

Patent US7507562 - yeast fermentation of corn to produce ethanol, then distilling the ethanol ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA process for producing ethanol by the conversion of carbohydrates from a corn dry milling process in which the bottoms fraction from distillation of ethanol in a conventional yeast fermentation is used in a process including a combination of biochemical and synthetic conversions. The process results...http://www.google.com/patents/US7507562?utm_source=gb-gplus-sharePatent US7507562 - yeast fermentation of corn to produce ethanol, then distilling the ethanol to produce bottoms, hydrolyzing the bottoms, separating the hydrolyzed bottoms into a solids fraction and liquid hydrolyzates and culturing microorganism in the liquid hydrolyzate to produce acetic acid, esters and/or mixturesAdvanced Patent SearchPublication numberUS7507562 B2Publication typeGrantApplication numberUS 11/339,238Publication dateMar 24, 2009Filing dateJan 24, 2006Priority dateMar 11, 1999Fee statusPaidAlso published asUS7074603, US7888082, US20030104587, US20060127999, US20090081749Publication number11339238, 339238, US 7507562 B2, US 7507562B2, US-B2-7507562, US7507562 B2, US7507562B2InventorsDan W. Verser, Timothy J. EggemanOriginal AssigneeZeachem, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (90), Non-Patent Citations (66), Referenced by (125), Classifications (17), Legal Events (6) External Links: USPTO, USPTO Assignment, Espacenetyeast fermentation of corn to produce ethanol, then distilling the ethanol to produce bottoms, hydrolyzing the bottoms, separating the hydrolyzed bottoms into a solids fraction and liquid hydrolyzates and culturing microorganism in the liquid hydrolyzate to produce acetic acid, esters and/or mixturesUS 7507562 B2Abstract A process for producing ethanol by the conversion of carbohydrates from a corn dry milling process in which the bottoms fraction from distillation of ethanol in a conventional yeast fermentation is used in a process including a combination of biochemical and synthetic conversions. The process results in high yield ethanol production with concurrent production of high value coproducts. An acetic acid intermediate is produced from bottoms fraction, followed by conversion of the acetic acid into ethanol using esterification and hydrogenation reactions. Coproducts of the process include a high protein content solids fraction produced in the fermentation.
15. The process, as claimed in claim 14, wherein the homoacetogenic microorganism is of the species Clostridium thermoaceticum or Clostridium formicoaceticum. 16. The process, as claimed in claim 1, wherein said step of culturing comprises:
18. The process, as claimed in claim 17, wherein said homolactic fermentation is accomplished by a microorganism of the genus Lactobacillus. 19. The process, as claimed in claim 16, wherein said step (ii) comprises a homoacetic fermentation.
20. The process, as claimed in claim 19, wherein said homoacetic fermentation is accomplished by a microorganism of the genus Clostridium. 21. The process, as claimed in claim 1, wherein step (f) comprises:
b. chemically convening the acetate, acetic acid or mixtures thereof to an ester of acetic acid. Description
REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 10/268,290, filed Oct. 9, 2002, which is a continuation-in-part of U.S. patent application Ser. No. 09/720,930, filed on Dec. 29, 2000, which was filed as an application under 35 U.S.C. 371 based on PCT Application No. PCT/US00/06498. PCT Application No. PCT/US00/06498 claims the benefit of priority under 35 U.S.C. 119(e) from U.S. Provisional Patent Application No. 60/124,276, filed on Mar. 11, 1999. Said U.S. patent application Ser. No. 10/268,290 also claims priority under 35 U.S.C. 119(e) from U.S. Provisional Patent Application No. 60/328,258, filed on Oct. 9, 2001. All of the foregoing applications are incorporated in their entirety by reference.
⁢ Fermentation ⁢ : Esterification ⁢ : Hydrogenation ⁢ : ⁢ Overall ⁢ : ⁢ ⁢ Glucose ⇒ ⁢ 3 ⁢ ⁢ Acetic ⁢ ⁢ Acid ⁢ 3 ⁢ ⁢ Acetic ⁢ ⁢ Acid + 3 ⁢ ⁢ Ethanol ⇒ 3 ⁢ ⁢ Ethyl ⁢ ⁢ Acetate + 3 ⁢ H 2 ⁢ O ⁢ 3 ⁢ ⁢ Ethyl ⁢ ⁢ Acetate + 6 ⁢ H 2 ⇒ 6 ⁢ ⁢ Ethanol ⁢ Glucose + 6 ⁢ H 2 ⇒ ⁢ 3 ⁢ ⁢ Ethanol + 3 ⁢ H 2 ⁢ O Each step can be done at high yield, so nearly every mole of acetate produced in the fermentation ends up as a mole of ethanol. In other words, each C6 sugar produces 3 moles of ethanol in our indirect route. By comparison, direct fermentation routes only produce 2 moles of ethanol for each C6 sugar. This 50% improvement in sugar utilization has a dramatic effect on the economics of bioethanol production.
Several kinetic studies (Yang et. al. 1988, Wang et. al. 1978, Tang et. al. 1988) have been conducted to examine the effects of pH and acetate levels on both cell growth and acid production. Unfortunately the organisms are sensitive to low pH and product inhibition occurs at much lower concentrations than with lactic acid bacteria. Optimal pH is around 7 and maximum acetate tolerance is about 30-50 g/l in batch fermentation There are other useful features of the fermentation from an industrial perspective. The fermentation takes place at a relatively high temperature, e.g. 58� C., thus reducing the possibility of contamination of the fermentation by stray organisms. The fermentation is anaerobic and thus there is no need for gas exchange. This greatly reduces the mixing and gas compression requirement and eliminates another source of possible contamination.
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