Source: http://www.google.com/patents/US6846657?ie=ISO-8859-1
Timestamp: 2014-12-22 04:16:48
Document Index: 404544779

Matched Legal Cases: ['Application No. 900220', 'Application No. 59', 'Application No. 59', 'Application No. 60', 'Application No. 62', 'art 3']

Patent US6846657 - Process for the simultaneous production of xylitol and ethanol - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention relates to a process for the simultaneous production of xylitol and ethanol from a hydrolyzed lignocellulose-containing material starting. The starting material is fermented with a yeast strain, the ethanol produced is recovered, a chromatographic separation is carried out on the remaining...http://www.google.com/patents/US6846657?utm_source=gb-gplus-sharePatent US6846657 - Process for the simultaneous production of xylitol and ethanolAdvanced Patent SearchPublication numberUS6846657 B2Publication typeGrantApplication numberUS 08/928,893Publication dateJan 25, 2005Filing dateSep 12, 1997Priority dateJan 15, 1990Fee statusLapsedAlso published asDE69118869D1, DE69118869T2, EP0511238A1, EP0511238B1, US20030235881, WO1991010740A1Publication number08928893, 928893, US 6846657 B2, US 6846657B2, US-B2-6846657, US6846657 B2, US6846657B2InventorsHeikki Heikkil�, G�ran Hy�ky, Leena Rahkila, Marja Leena Sarkki, Tapio ViljavaOriginal AssigneeXyrofin OyExport CitationBiBTeX, EndNote, RefManPatent Citations (38), Non-Patent Citations (45), Referenced by (5), Classifications (22), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetProcess for the simultaneous production of xylitol and ethanolUS 6846657 B2Abstract The invention relates to a process for the simultaneous production of xylitol and ethanol from a hydrolyzed lignocellulose-containing material starting. The starting material is fermented with a yeast strain, the ethanol produced is recovered, a chromatographic separation is carried out on the remaining xylitol solution, and pure xylitol is crystallized.
CROSS REFERNCES TO RELATED APPLICATIONS This application is a continuation of U.S. Pat. No. U.S. Ser. No. 07/910,133 filed Jul. 14, 1993, now abandoned, which is a United States national stage application under 35 U.S.C. 371 of PCT International Application PCT/FI/00011, filed Jan. 10, 1991, which is based upon Finnish Patent Application No. 900220, filed on Jan. 15, 1990. This application is also commonly owned with Heikkila et al. U.S. Pat. No. 5,081,026, which issued on Jan. 14, 1992, from U.S. Ser. No. 611,385 filed Nov. 2, 1990 as provided under 35 USC �102 (e) and 35 USC �103(c).
Xylitol is a naturally occurring sugar alcohol which is formed in the reduction reaction of xylose and which corresponds to �normal� sugar in sweetness and caloric content (4 kcal/g). Xylitol is found in small quantities in many fruits and vegetables and is also produced in the human body as a normal metabolic product. Xylitol is a very good special sweetener in different connections on account of its certain metabolic, dental and technical properties. It may be mentioned by way of example that xylitol metabolism is independent of the insulin metabolism, and therefore also diabetics can use xylitol. Xylitol also has a retarding effect on the bowel, wherefore it may have utility in reducing diets. Furthermore, it has been found that xylitol does not cause caries but has a cariostatic effect.
SUMMARY OF THE INVENTION It has now been found that xylitol and ethanol can be produced simultaneously by using the process of the invention wherein xylose is converted to xylitol, while the majority of the other hexoses present in the raw material are converted to ethanol. Thus the raw material is effectively utilized and two commercially very important products are obtained in a pure form and with a high yield. The process is simple and effective.
BRIEF DESCRIPTION OF THE FIGURE The FIGURE graphically illustrates the results from Example 2 of the application by showing the content of various samples, including xylitol-rich fractions, obtained via chromatographic separation.
DETAILED DESCRIPTION OF THE INVENTION Almost any xylane-containing material can be used as a starting material in the process of the invention. Possible starting materials include softwood, such as birch, beech, poplar, alder etc., and plants or plant constituents, such as straw or hulls of wheat, corn, oat or barley, corn cobs and stems of corn, nutshells, bagasse, and cottonseed bran. When wood is used as a starting material, it is advantageously comminuted or used as chips, sawdust, etc. and treated by hydrolysis or steam explosion and posthydrolysis, in which connection a carbohydrate material useful in this invention is obtained.
EXAMPLE 1 Production of Ethanol and Xylitol from Birch Chips
EXAMPLE 2 Production of Ethanol and Xylitol from Sulphite spent Liquor
EXAMPLE 3 Crystallization of Xylitol
EXAMPLE 4 Production of Ethanol and Xylitol from Barley Hulls
EXAMPLE 5 Production of Ethanol and Xylitol from Oat Hulls
EXAMPLE 6 Steam Explosion and Extraction of Birch Chips
EXAMPLE 7 Enzymatic Degradation of Steam-Exploded Water-Washed Birch Chip Mass
EXAMPLE 8 Fermentation of Enzymatic Hydrolysate of Steam Exploded, Water Washed Birch Chip Mass into Ethanol
EXAMPLE 9 Recovery of Ethanol from the Fermentation Product of Enzymatic Hydrolysate of Steam Exploded, Water Washed Birch Chip Mass
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Symp., 1981, vol. 2, pp. 21-26.45Zaborsky, O., Immobilized Enzymes, CRC Press, pp. 5-27.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7449313Jan 14, 2008Nov 11, 2008Rush Stephen LSystems and processes for cellulosic ethanol productionUS7514247Aug 15, 2008Apr 7, 2009Wise Landfill Recycling Mining, Inc.Systems and processes for cellulosic ethanol productionUS7524418Aug 28, 2007Apr 28, 2009Stanley Consultants, Inc.fermenting a corn mash in an aqueous medium to produce a beer; generated biogas is then used in place of natural gas in the biofuel production as well as for the production of electricity; biosynthesis; VOC-free, heat exchanging; recover ammonia sold as fertilizer; cost and energy efficiencyUS7598374Mar 25, 2005Oct 6, 2009Purdue Research FoundationElectrochemically oxidatively decarboxylating a D-glucuronic acid compound to produce a dialdehydo xylitol intermediate and hydrogenating the intermediate to produce xylitolUS7662617Apr 7, 2009Feb 16, 2010Rush Stephen Lintegrated cellulosic ethanol and biodiesel production system; feed stage, hydrolysis, liquefaction, fermentation, separation, algae generationClassifications U.S. Classification435/158, 435/924, 435/163, 435/105, 435/938, 435/255.4, 435/255.5, 435/161, 435/255.7, 435/165International ClassificationC12R1/74, C12R1/645, C12P7/10, C12P7/18Cooperative ClassificationY10S435/938, Y10S435/924, Y02E50/16, Y02E50/17, C12P7/10, C12P7/18European ClassificationC12P7/10, C12P7/18Legal EventsDateCodeEventDescriptionMar 19, 2013FPExpired due to failure to pay maintenance feeEffective date: 20130125Jan 25, 2013LAPSLapse for failure to pay maintenance feesSep 10, 2012REMIMaintenance fee reminder mailedJul 25, 2008FPAYFee paymentYear of fee payment: 4Sep 9, 2004ASAssignmentOwner name: DANISCO SWEETNERS FINLAND OY, FINLANDFree format text: MERGER;ASSIGNOR:XYROFIN OY;REEL/FRAME:015115/0761Effective date: 20031205Owner name: DANISCO SWEETNERS FINLAND OY SOKERITEHTAANTIE 20KAFree format text: MERGER;ASSIGNOR:XYROFIN OY /AR;REEL/FRAME:015115/0761RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google