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| Number | Title | Issue Date |
| 7696378 | Depolymerization process The present invention relates to a process for decomposing a polymer into a monomer or oligomer by hydrolysis with sub- or supercritical water. The process of the present invention is characterized in that at least a part of the polymer is a polymer comprising a con... | 04/13/2010 |
| 7361273 | Separation of sugars, sugar alcohols, carbohydrates and mixtures thereof The present invention relates to a method of separating sugars and sugar alcohols from each other. More particularly the present invention relates to the use of a weakly basic anion exchange resin in a chromatographic separation process. The advantage of the present... | 04/22/2008 |
| 7342130 | Method for producing acrylic acid A method for producing acrylic acid, comprising (a) a absorption step of absorbing acrylic acid-containing gas obtained by oxidizing raw material gas in gas phase as crude acrylic acid-containing solution, (b1) a step of separating high boiling point componen... | 03/11/2008 |
| 7285402 | Methods for increasing the production of ethanol from microbial fermentation A stable continuous method for producing ethanol from the anaerobic bacterial fermentation of a gaseous substrate containing at least one reducing gas involves culturing a fermentation bioreactor anaerobic, acetogenic bacteria in a liquid nutrient medium; supplying ... | 10/23/2007 |
| 6942803 | Process for purifying an organic acid A process is disclosed for purifying an aqueous feed stream comprising a product organic acid, such as lactic acid, and a strong contaminant, such as pyruvic acid or oxalic acid. The molar concentration of the product organic acid in the feed stream typically is at ... | 09/13/2005 |
| 6822117 | Method for making adipic acid The present invention relates to a process for the manufacture of adipic acid, more particularly of adipic acid crystals. It relates more specifically to a process for the treatment of the adipic acid crystals obtained on conclusion of crystallization, which ... | 11/23/2004 |
| 6673951 | Process for catalytically hydrogenating phytosterols The present invention provides a process for catalytically hydrogenating unsaturated phytosterol compounds. The catalyst used for such hydrogenation is an alumina-supported transition metal selected from the group consisting of nickel, palladium, platinum... | 01/06/2004 |
| 6656723 | Odor controlling composition and methods of making and using The invention relates to a composition and method for controlling odors, the composition containing an activated lignin-derived complex containing a histosol compound, and optionally containing a hydrolytic enzyme, or at least one microorganism capable of... | 12/02/2003 |
| 6428992 | Process for the purification of 1,3-propanediol from a fermentation medium The present invention relates to a process for the purification of 1,3-propanediol from a fermentation medium of a 1,3-propanediol-producing microorganism, comprising 1,3-propanediol and fermentation coproducts consisting at least of glycerol, wherein the... | 08/06/2002 |
| 6395926 | Process for recovering low-boiling acids The invention provides a method for recovering low-boiling acids from a concentrated solution of the calcium salt of the acid by treating the concentrated solution of calcium salts of the low-boiling acids with a high molecular weight tertiary amine and c... | 05/28/2002 |
| 6284904 | Purification of organic acids using anion exchange chromatography Disclosed is a cost-effective method for purifying and acidifying carboxylic acids, including organic acids and amino acids. The method involves removing impurities by allowing the anionic form of the carboxylic acid to bind to an anion exchange column an... | 09/04/2001 |
| 6262313 | Thermal conversion of fatty acid salts to ketones This invention provides a method for thermally converting volatile fatty acid (VFA) salts to ketones by mixing dry calcium salts of VFAs with hot heat transfer agent in an evacuated container, thereby causing thermal decomposition of the calcium salts of ... | 07/17/2001 |
| 6254779 | Treatment of effluent streams containing organic acids An acidic organics-containing waste water stream (12) derived from for example plant for the production of an aromatic carboxylic acid such as terephthalic acid is treated to allow recovery of alkali and water for recycle to the production process. The tr... | 07/03/2001 |
| 6252109 | Method for the recovery of formic acid The invention relates to a method for removing chemically bound formic acid from a material containing the same, in the presence of free formic acid. The method is characterized in that chemically bound formic acid is allowed to react to free formic acid ... | 06/26/2001 |
| 6222069 | Method for purifying adipic acid in water The invention discloses a method for purifying adipic acid in water. More precisely it discloses an improvement in adipic acid crystallization or recrystallization in water, characterised in that the said crystallization or recrystallization is effected i... | 04/24/2001 |
| 6204396 | Method for producing calcium fulvate from humus material A method produces calcium fulvate from naturally-occurring humus material, such as leonardite, or humic shales. The humus material containing solid fulvic acid and solid humic acid is mixed with water and sodium hydroxide for a first selected period of ti... | 03/20/2001 |
| 6180827 | Recovery of acrylic acid from process or waste water streams Disclosed is a method for recovering acrylic acid from process or waste water streams in which the stream is vaporized and contacted with a liquid high boiling solvent for acrylic acid, thereby absorbing acrylic acid into the solvent. Mixed trialkylphosph... | 01/30/2001 |
| 6174928 | Process for producing fluorinated oligomer having COOH groups at both ends A fluorinated oligomer having COOH groups at both end and a .rho.50° value of 1,000 to 10,000 is produced by swelling a fluorine rubber crosslinking product in an organic solvent, followed by decomposition in the presence of a base and a perox... | 01/16/2001 |
| 6153791 | Process for purifying 2-keto-L-gulonic acid The present invention relates to a process for the purification of 2-keto-L-gulonic acid by continuous liquid chromatography using a weakly basic ion exchange resin.... | 11/28/2000 |
| 6043392 | Method for conversion of biomass to chemicals and fuels This invention provides a method for thermally converting volatile fatty acid (VFA) salts to ketones by mixing dry calcium salts of VFAs with hot heat transfer agent in an evacuated container, thereby causing thermal decomposition of the calcium salts of ... | 03/28/2000 |
| 6022992 | Acid-salt metathetic process A cation exchange membrane mediated acid-salt metathetic process. An aqueous salt solution is placed into a first compartment on one side of the membrane together with an organic amine extractant of limited water miscibility, and an aqueous acid solution ... | 02/08/2000 |
| 5905168 | Process for treating a material comprising a polymer by hydrolysis Process for the treatment of a material comprising a polymer, especially a polyamide. The process consists in subjecting the polyamide to hydrolysis in the presence of a hydrolyzing nitrous grouping and transforming the hydrolyzed compounds into diacids. ... | 05/18/1999 |
| 5591877 | Process for the recovery of fluorinated carboxylic acids Fluorinated carboxylic acids can be recovered from materials which contain them by releasing, if necessary, the carboxylic acids with sufficiently strong acids, esterifying the released acids and distilling off the esters. The esters can be advantageously... | 01/07/1997 |
| 5587511 | Process for obtaining adipic acid The present invention relates to a process for obtaining adipic acid from the aqueous nitric acid mother liquors that arise during industrial adipic acid production by (i) removing nitric acid from the aqueous mother liquor by evaporation to a concentrate... | 12/24/1996 |
| 5471001 | Crystallization of adipic acid Crystallization of adipic acid using low intensity ultrasonic agitation during crystallization results in purer product that is more readily handled. Apparatus for carrying out the process is also disclosed.... | 11/28/1995 |
| 5288904 | Method for the decomposition of trichloroacetic acid A process for the decomposition of trichloroacetic acid (TCAA) to form chlorides, carbonates and formates is disclosed. The process comprises treating TCAA with 6 or more equivalents of a metal hydroxide at a temperature above 60° C.... | 02/22/1994 |
| 5264624 | Process for the recovery of adipic acid This invention relates to a process for the recovery of adipic acid from mother liquors collected during commercial production of adipic acid, wherein said mother liquors contain from 52 to 60% by weight of nitric acid calculated as HNO3, not t... | 11/23/1993 |
| 5231225 | Concurrent production of citric acid and alkali citrates The known liming sulfuric acid process for the recovery of crystalline citric acid from a fermentation broth is modified by subjecting the mother liquor from the crystallization to extraction with a water-immiscible organic extraction that contains an ami... | 07/27/1993 |
| 5202476 | Purification of 2-keto-L-gulonic acid According to the present invention which comprises subjecting an aqueous solution of 2-keto-L-gulonic acid or its water-soluble salt containing an acid impurity, whose acidity is higher than that of 2-keto-L-gulonic acid, to contact with an anion-exchange... | 04/13/1993 |
| 5175357 | Process for recovering acetic acid from aqueous acetic acid solutions A process for recovering acetic acid from an aqueous acetic acid solution comprises contacting the solution with a solvent comprising a diluent component and an extractant component. The extractant component is selected from the group consisting of di-2,4... | 12/29/1992 |
| 5145989 | Recovery of acrylic acid and/or ethyl acrylate from black acid Black acid or the sulfuric acid residue obtained in the manufacture of ethyl acrylate by reaction of ethylene and acrylic acid in the presence of sulfuric acid is heated and distilled in the presence of a solvent for recovery of acrylic acid and ethyl acr... | 09/08/1992 |
| 5024731 | Method of manufacturing material for medical and pharmaceutical products from pyroligneous acid A method of manufacturing a material for medical and pharmaceutical products from pyroligneous acid extracted as water content in smoke generated by baking arbor and bark. Pyroligneous acid is heated, and resultant evaporation gas in a temperature range 9... | 06/18/1991 |
| 4902828 | Recovery of aqueous glyoxylic acid solutions Aqueous glyoxylic acid solutions, essentially free of other acids, are recovered from aqueous solutions which still contain other acids, by a method in which the aqueous solution is mixed with an organic nitrogen compound at as high as 50° C., the phases... | 02/20/1990 |
| 4883912 | Process for the recovery of acetic acid In a process for the recovery of acetic acid by extracting acetic acid from an aqueous acetic acid solution containing a metallic salt of sulfuric acid with an organic extractant comprising a tertiary amine and an organic diluent and recovering acetic aci... | 11/28/1989 |
| 4720577 | Process for the extraction of carboxylic acids from dilute aqueous solutions The invention relates to a process for the extraction of carboxylic acids from aqueous solutions with a carboxylic acid content below 8% by weight. A mixture of an aliphatic amine with a total carbon number of at least 10 and a phenol or naphthol is used ... | 01/19/1988 |
| 4658057 | Extraction method In extracting a solute from an aqueous solution using a mixer-settler extractor and an organic extractant comprising a mixture of a tertiary amine and an organic diluent, the extractor is operated while the liquid phase inside the mixer thereof is kept in... | 04/14/1987 |
| 4628116 | Vinyl bromide extraction of butyric acid and butanol from microbial fermentation broth The process of extracting butyric acid and normal butanol from microbial fermentation broth, comprising contacting an aqueous solution of a microbial fermentation broth with vinyl bromide to extract any butyric acid and normal butanol which is present fro... | 12/09/1986 |
| 4612389 | Treatment of waste stream from pentaerythritol manufacture This invention provides a process for improving the separation and recovery of metal formate and pentaerythritol as crystalline products, from an aqueous waste stream of a pentaerythritol manufacturing operation which involves the reaction of formaldehyde... | 09/16/1986 |
| 4584057 | Membrane processes for separation of organic acids from kraft black liquors An aliphatic organic acid fraction is separated from the kraft black liquor by subjecting the liquor to ultrafiltration, treating the resulting permeate by electrodialysis, acidifying the resultant deionate to about pH 4-5, separating the lignin solids wh... | 04/22/1986 |
| 4562288 | Method of operating mixer-settler In extracting object material from its aqueous solution by using an organic solvent, a mixer-settler extractor is employed as the extractor and operated while a solvent dispersion is maintained in the mixer, and part of the aqueous phase discharged from t... | 12/31/1985 |
