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| Number | Title | Issue Date |
| 8183417 | Purification of biologically-produced 1,3-propanediol A process for purifying 1,3-propanediol from the fermentation broth of a cultured E. coli that has been bioengineered to synthesize 1,3-propanediol from sugar is provided. The basic process entails filtration, ion exchange and distillation of the fermentation... | 05/22/2012 |
| 8148581 | Process for preparing plastics using 1,6-hexanediol having an aldehyde content of less than 500 ppm The present invention relates to a process for preparing plastics using 1,6-hexanediol having an aldehyde content of less than 500 ppm, a process for preparing 1,6-hexanediol having an aldehyde content of less than 500 ppm and also 1,6-hexanediol having an aldehyde ... | 04/03/2012 |
| 8124815 | Process for preparing 1,6-hexanediol The invention relates to a process for preparing 1,6-hexanediol, in which a hexanediol having a proportion by weight of nitrogen of less than 5 ppm is obtained, 1,6-hexanediol having a proportion by weight of nitrogen of less than 5 ppm and also the use of this 1,6-... | 02/28/2012 |
| 8063255 | Process for the recovery of monoethylene glycol A process for recovering monoethylene glycol from a catalyst bleed stream is disclosed. The process comprises combining the catalyst bleed stream with a heavies stream comprising at least 40 wt % diethylene glycol, to provide a combined stream and distilling the com... | 11/22/2011 |
| 7919658 | Purification of biologically-produced 1,3-propanediol A process for purifying 1,3-propanediol from the fermentation broth of a cultured E. coli that has been bioengineered to synthesize 1,3-propanediol from sugar is provided. The basic process entails filtration, ion exchange and distillation of the fermentation... | 04/05/2011 |
| 7893305 | Separation of diols from a mixture comprising diols and polyols The present invention relates to a process for separation of diols from a mixture comprising diols and polyols, for example, from a reaction mixture obtained from hydrogenolysis of sorbitol. In particular, the present invention relates to separation of diols from th... | 02/22/2011 |
| 7488855 | Method of isolating 1,3-propanediol or 1,3-propanediol and 1,2-propanediol from solution containing 1,3-propanediol, 1,2-propanediol, glycerol, and glucose A method of isolating 1,3-propanediol from a solution containing 1,3-propanediol, 1,2-propanediol, glycerol, and glucose is provided. The method includes: obtaining a concentrate by concentrating the solution via reduced pressure evaporation; dissolving the concentr... | 02/10/2009 |
| 7342142 | Hydrogenation of polytrimethylene ether glycol A process comprising contacting PO3G having color with hydrogen in the presence of a hydrogenation catalyst, wherein the PO3G, after hydrogenation, has a APHA color of less than about 50. ... | 03/11/2008 |
| 7335800 | Hydrogenation catalyst and hydrogenation method The present invention provides a hydrogenation catalyst effective for hydrogenating 3-hydroxypropionaldehyde to 1,3-propanediol. The hydrogenation catalyst comprises an α-alumina support, nickel, ruthenium, and a promoter. The nickel is deposited on the α-alumina ... | 02/26/2008 |
| 7332634 | Method for the continuous purification by distillation of 1,2-propylene glycol that accumulates during the synthesis of propylene oxide without coupling products The invention relates to a continuously operated process for the purification by distillation of the 1,2-propylene glycol formed as by-product in the synthesis of propylene oxide, wherein the mixture formed in the synthesis which contains the 1,2-propylene glycol is... | 02/19/2008 |
| 7321070 | Synthesis of isotopically labeled R- or S-[C, H] glycerols The present invention is directed to asymmetric chiral labeled glycerols including at least one chiral atom, from one to two 13C atoms and from zero to four deuterium atoms bonded directly to a carbon atom, e.g., (2S) [1,2-13C2]glyce... | 01/22/2008 |
| 7276634 | Reduction of the viscosity of reactive heavy byproducts during the production of 1,3-propanediol The present invention is an improvement upon the process for the production of 1,3-propanediol wherein an aqueous solution of 3-hydroxy propanal is formed, catalyst, if any, used in said formation is removed from the solution, sodium hydroxide is added to the soluti... | 10/02/2007 |
| 7232505 | Method of regenerating an aqueous glycol solution containing salts Method of regenerating a glycol solution containing water, hydrocarbons and salts. The glycol solution is expanded in drum (2), then distilled in column (7). The concentrated glycol collected at the level of reboiler (8) is placed under vacuum t... | 06/19/2007 |
| 7211699 | Purification of biochemically derived 1,3-propanediol The invention discloses a hydrogenation process for removing impurities and controlling acid for use in downstream processing of biochemically-derived 1,3-propanediol. Preferably, the biochemically-derived 1,3-propanediol, before the contacting, has an initial color... | 05/01/2007 |
| 7211701 | Preparation of trimethylolpropane The present invention relates to a process for preparing trimethylolpropane having a low APHA color number. ... | 05/01/2007 |
| 7182841 | Purification of solvents used for the purification of alkylene oxide This invention concerns a process for removing carbonyl-containing impurities from impure extractive distillation solvent such as a glycol, comprising: contacting the impure extractive distillation solvent with an acidic ion exchange resin. The purified extractive d... | 02/27/2007 |
| 7179388 | Method for removing formic acid from aqueous solutions Formic acid is at least partly removed from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol by decomposition over certain decomposition catalysts. The method is preferably used for processing reaction products from the oxidation of ... | 02/20/2007 |
| 7164048 | High-purity polyalkylene glycols and preparation thereof A process is described for purifying polyalkylene glycols obtained by adding alkylene oxide to alkylene glycol, in which, after addition is complete, the resultant polyalkylene glycol is treated at a pH of >7 with a bleaching agent selected from the group consisting... | 01/16/2007 |
| 7126032 | Purification of glycerin A process for purifying glycerin recovered as a byproduct of biodiesel production comprises heating a glycerin effluent stream containing a low molecular weight alcohol, water and fatty acid esters of the low molecular weight alcohol to cause transesterification of ... | 10/24/2006 |
| 7098368 | Hydrogenation of biochemical derived 1,3 -propanediol The invention discloses a hydrogenation process for removing impurities and controlling acid for use in downstream processing of biochemically-derived 1,3-propanediol. Preferably, the biochemically-derived 1,3-propanediol, before the contacting, has an initial color... | 08/29/2006 |
| 7084311 | Hydrogenation of chemically derived 1,3-propanediol Disclosed is a process comprising contacting chemical 1,3-propanediol with hydrogen in the presence of a hydrogenation catalyst. Preferably, the chemical 1,3-propanediol, before the contacting has an initial color and, after the contacting, has a color that is lower... | 08/01/2006 |
| 7084310 | Method for the continuous production of propylene glycol Process for the continuous preparation of propylene glycols, which comprises the steps (i) to (ii): (i) reacting propylene with hydrogen peroxide to form propylene oxide and give propylene glycols as by-products, (... | 08/01/2006 |
| 7056439 | Process for producing 1, 3-propanediol Disclosed herein are processes for the recovery of 1,3-propanediol from an aqueous feed stream. The present invention involves contacting an aqueous feed stream that comprises water, 1,3-propanediol, and at least one contaminant with at least one solvent extractant ... | 06/06/2006 |
| 7038094 | Hydrogenolysis of 5-carbon sugars, sugar alcohols, and methods of making propylene glycol Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 5-carbon sugar, sugar alcohol, or lactic acid are described. It has been surprisingly discovered that reaction with hydrogen over a Re-containing multimet... | 05/02/2006 |
| 7038092 | Purification of chemical 1,3-propanediol Disclosed is a process comprising contacting chemical 1,3-propanediol with hydrogen in the presence of a hydrogenation catalyst. Preferably, the chemical 1,3-propanediol, before the contacting has an initial color and, after the contacting, has a color that is lower... | 05/02/2006 |
| 6992213 | Method for removing trifluoroethanol from liquids Trifluoroethanol can be isolated from organic liquids that are contaminated by trifluoroethanol by bringing the contaminated liquid into contact with a molecular sieve having a pore size ranging between 0.5 and 1.0 nm, e.g., with molecular sieve 13X. This enables, f... | 01/31/2006 |
| 6977291 | Production of polytrimethylene ether glycol and copolymers thereof A process for the manufacture of polytrimethylene ether glycol comprising the steps of: (a) providing (1) 1,3-propanediol reactant selected from the group consisting of 1,3-propanediol and/or oligomers or prepolymers of 1,3-propanediol having a degree of polymerizat... | 12/20/2005 |
| 6972346 | Solid acid catalyzed reactive stripping of impurities formed during the production of 1, 3-propanediol A process for producing 1,3-propanediol comprising the steps of: a) forming an aqueous solution of 3-hydroxypropanal, b) hydrogenating the 3-hydroxypropanal to form a first crude 1,3-propanediol mixture comprising 1,3-propanediol, water, and MW 132 cyclic acetal, c)... | 12/06/2005 |
| 6969779 | Method for removal of MW176 cyclic acetal formed during the production of 1,3-propanediol The present invention is an improvement upon the process for the production of 1,3-propanediol (PDO) wherein an aqueous solution of 3-hydroxypropanal (HPA) is formed, and the HPA is subjected to hydrogenation to produce a crude PDO mixture comprising PDO, water, MW1... | 11/29/2005 |
| 6964729 | Oxidizing undesired compounds resident within liquid absorbent compounds, reducing atmospheric pollution, regenerating a liquid absorbent and conserving fuel usage associated with reboiler utilization An improved method and apparatus for oxidizing undesired compounds residing within a liquid glycol based absorbent wherein the compounds are heated within a reboiler chamber to their boiling point to effectuate production of vaporized effluents. The absorbent's vapo... | 11/15/2005 |
| 6939993 | Method for separation of reaction products from catalysts Method for separating reaction product from imide compound catalyst represented by Formula (1) or derivative thereof in reaction mixture obtained by reaction in presence of imide compound catalyst: wherein R1 | 09/06/2005 |
| 6909022 | Process of removing organic halogen-containing compounds The present invention relates to a process of removing organic halogen-containing compounds from a liquid stream mainly containing one or more of the compounds selected from the group consisting of glycol, water and alcohol, which process involves contacting the str... | 06/21/2005 |
| 6900360 | High-purity 1,3-butylen glycol, process for producing 1,3-butylene glycol, and process for producing by-product butanol and butyl acetate A method is provided for the preparation of high-purity 1,3-butylene glycol from acetaldehyde. In the method, acetaldehyde is condensed in the presence of base to form a mixture of acetaldols, and the acetaldols are then converted to 1,3-butylene glycol by hydrogena... | 05/31/2005 |
| 6858761 | Process for preserving resin catalyst for addition reaction of alkylene oxide and utilization of this process The present invention provides a process and its utilization in a process comprising the step of carrying out an addition reaction of an alkylene oxide to an addition-receiving substance in the presence of a resin catalyst, thereby producing the addition reaction pr... | 02/22/2005 |
| 6846389 | Method for distillative separation of mixtures containing tetrahydrofuran, γ-butyrolactone and/or 1,4-butanediol In a process for the continuous fractional distillation of mixtures comprising tetrahydrofuran, γ-butyrolactone and/or 1,4-butanediol to give at least three fractions, the fractionation is carried out in an assembly of distillation columns comprising at least one d... | 01/25/2005 |
| 6632331 | Distillation of polycyclic diol Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol com... | 10/14/2003 |
| 6605192 | Method for producing highly pure monoethylene glycol A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis, product of ethylene oxide by pressure dewatering, preferably in a battery, vacuum dewatering and subsequent purifying distillation, wherein during the vacuum d... | 08/12/2003 |
| 6603048 | Process to separate 1,3-propanediol or glycerol, or a mixture thereof from a biological mixture A process is provided to separate 1,3-propanediol, glycerol, or a mixture of 1,3-propanediol and glycerol from a biological mixture using a molecular sieve.... | 08/05/2003 |
| 6586642 | Color number improvement in polyhydric alcohols by hydrogenation A process for greatly improving the color index of polyhydric alcohols, especially trimethylolpropane, by hydrogenation comprises using, in the hydrogenation, an alcohol which has already been purified by distillation. The catalysts used are those convent... | 07/01/2003 |
| 6565753 | Method for purification of deicing fluid for recovery of glycol In the purification of deicing fluid for recovery of glycol, initially solid particles are separated, then dissolved organic compounds and positive and negative ions are separated by an ion exchange in an ion exchanger, and finally water is separated by d... | 05/20/2003 |
