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| Number | Title | Issue Date |
| 7435858 | Process for the preparation of alkylene glycols A process for the production of alkylene glycol by hydrolysis of alkylene oxide with water is described wherein at least one reaction feed is first passed through a guard bed before entering a catalyst bed comprising hydrolysis catalyst. ... | 10/14/2008 |
| 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 |
| 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 |
| 7022813 | Process for purifying and reusing solvent used to remove extractables A process for treating biomedical devices, especially contact lenses, involves contacting polymeric devices containing extractables with a solvent that dissolves and thereby removes the extractables from the device, treating the solvent to remove extractables from t... | 04/04/2006 |
| 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 |
| 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 |
| 6580008 | Catalytic process for producing an alkylene glycol with reactor-output recycle A process for the production of an alkylene glycol comprising: a feed mixture containing a respective alkylene oxide and water is introduced to at least one inlet of a reactor containing a fixed bed of a solid catalyst based on an anion exchange resin, and a r... | 06/17/2003 |
| 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 |
| 6525229 | Process for separating ethylene glycol A process for separating ethylene glycol from its aqueous mixture with organic acids, salts and unidentified UV light absorbers, the process comprising the steps of a) flashing the aqueous mixture under conditions effective to produce a bottom slurry cont... | 02/25/2003 |
| 6479716 | Method of recovering 1,3-propanediol from fermentation broth A method of recovering 1,3 -propanediol (PDO) from fermentation broth is disclosed. The method employs ion exclusion resins to separate PDO from other impurities. The product fraction contains greater than 80% pure PDO with high yield.... | 11/12/2002 |
| 6437199 | Method for production of high-purity monoethylene glycol A method for the production of monoethylene glycol of high purity is disclosed which comprises subjecting ethylene to catalytic vapor phase oxidation with a molecular oxygen-containing gas thereby obtaining an ethylene oxide-containing gas, exposing the e... | 08/20/2002 |
| 6274727 | Method for producing shaped and unshaped polyol masses The invention relates to a composition, comprising one or more polyols, which has prolonged deformability and can be processed to give tablets, compacts or boiled sweets having improved properties.... | 08/14/2001 |
| 6242655 | Glycol purification High purity ethylene glycol containing 2000 ppm or less aldehyde is contacted with a solid strong acid cation exchange resin and an ethylene glycol product reduced in aldehydes content is recovered.... | 06/05/2001 |
| 6235948 | Process for the purification of 1,3-propanediol Disclosed is a process for the removal of impurities, especially color forming impurities, from 1,3-propanediol.... | 05/22/2001 |
| 6187973 | Glycol purification Aqueous ethylene glycol solution containing aldehydes such as formaldehyde, acetaldehyde and the like is contacted with a solid bisulfite treated strong base anion exchange resin and a solution reduced in aldehydes content is separated.... | 02/13/2001 |
| 6184423 | Method to eliminate formic acid and acetic acid from process water in ethylene glycol plant The present invention provides and relative equipment to eliminate formic acid and acetic acid from process water in ethylene glycol plant. First, we use weakly basic anion resin to absorb the weakly acidic ions of formic acid and acetic acid. The rest fr... | 02/06/2001 |
| 6030820 | Process for producing high-purity erythritol crystal A process for producing a high-purity erythritol crystal comprising a crystallization step of subjecting an erythritol-containing aqueous solution as a raw solution to crystallization, wherein an erythritol concentration of said erythritol-containing aque... | 02/29/2000 |
| 5770778 | Purification of ethylene glycol recovered from polyester resins There is described a process for purifying ethylene glycol recovered from scrap polyester by contacting the recovered ethylene glycol with, in either order, a first adsorbent that has a high affinity for polar contaminants and a second adsorbent that has ... | 06/23/1998 |
| 5767329 | Purity of 1,6-hexanediol Impurities are separated from aqueous solutions of 1,6-hexanediol or 1,6-hexanediol precursors, such as adipic and 6-hydroxycaproic acid, by a process which comprises adding at least one carboxylic acid to a solution (a) of 1,6-hexanediol and subjecting t... | 06/16/1998 |
| 5659092 | Purification process The present invention relates, in general, to a purification process, and particular, to a process of removing cyclic alkane alcohols from compositions comprising linear alkane alcohols.... | 08/19/1997 |
| 5583215 | Crystalline mixture solid containing maltitol and a process for preparing it The crystalline mixture solid containing maltitol of the present invention has a crushed and relatively tight crystal structure which can be observed at 1,000 magnifications by a scanning electron microscope, an apparent specific gravity in the range of 0... | 12/10/1996 |
| 5482631 | Separation of inositols from sugars and sugar alcohols When a strong base anion exchange resin, such as a chloride-form strong base anion exchange resin, is conditioned with a low concentration of hydroxyl (for example, an NaOH solution with a concentration between 1 and 10 mM), the conditioned resin separate... | 01/09/1996 |
| 5440058 | Method for separating compounds in process streams A method, especially applicable on a continuous basis to commercial process streams, for treating unwanted by-products and/or impurities contained in those streams. The method comprises the reaction in situ of such by-products or impurities with a reagent... | 08/08/1995 |
| 5354856 | Crystalline mixture solid containing maltitol and a process for preparing it The crystalline mixture solid containing maltitol of the present invention has a crushed and relatively tight crystal structure which can be observed at 1,000 magnifications by a scanning electron microscope, an apparent specific gravity in the range of 0... | 10/11/1994 |
| 5294305 | Ethylene glycol recovery process The present invention is an improved process for the recovery of ethylene glycol from spent glycol generated in the manufacture of polyethylene terephthalate. The spent glycol typically consists of metal oxide catalyst residues, low molecular weight terep... | 03/15/1994 |
| 5105029 | Process for recovering a lower alcohol from a catechol-lower alcohol reaction product solution A lower alcohol, for example, ethyl alcohol, is recovered from a reaction mixture resulted from a reaction of catechol with a lower alcohol in such a manner that the reaction mixture is distilled and separated into a distilled light vapor fraction compris... | 04/14/1992 |
| 5096594 | Chromatographic method of purifying cyclitols A method of purifying cyclitols, particularly inositol, from mixtures including simple and complex carbohydrates begins by reducing the concentration of carbohydates other than cyclitols to facilitate separation and crystallization of the cyclitol in high... | 03/17/1992 |
| 5076896 | Process for the separation of propylene glycol from fatty alcohols A process for the separation of propylene glycol from a mixture of low-boiling fatty alcohols and propylene glycol which comprises extracting the mixture with water to produce a water-propylene glycol mixture and fractionating the water-propylene glycol m... | 12/31/1991 |
| 4997489 | Extraction of products from almond fruit The invention relates to a process for recovering sugar, sugar alcohol and organic acids comprising citric, malic and quinic acids from a juice extracted from almond hulls. Residues from the extraction is also recovered.... | 03/05/1991 |
| 4922032 | Process for the preparation of optically active 2-methyl-1,2-hexanediols Disclosed is the preparation of both optically active stereoisomers of 2-methyl-1,2-hexanediol, which are useful intermediates for the syntheses of several prostaglandins for peptic ulcer therapy.... | 05/01/1990 |
| 4849023 | Process for the preparation of a product with a high content of maltitol and uses of this product Process for the preparation of a product with a high content of maltitol, characterized by the following steps: catalytic hydrogenation of a maltose syrup, chromatographic fractionation of the maltitol syrup formed during the hydrogenation step, adjustment to ... | 07/18/1989 |
| 4846139 | Process for the preparation of crystalline maltitol Process for the preparation of crystalline maltitol comprising successively: catalytic hydrogenation of a saccharified starch milk in a vessel 203, a step of chromatographic fractionation of the hydrogenated syrup in a vessel 204, crystallation and separation ... | 07/11/1989 |
| 4605783 | Process for separating monoterpenes An adsorptive method of separating alcohols and aldehydes or ketones and alcohols of monoterpenes is disclosed. The method uses an X-type zeolite containing sodium and potassium cations to selectively adsorb the alcohols thereby allowing recovery of an al... | 08/12/1986 |
| 4588847 | Process for separation of ethylene glycol and propylene glycol on selected zeolites A process for liquid-phase separation of ethylene glycol from mixtures containing propylene glycol by selective adsorption on at least one aluminosilicate zeolite selected from the group consisting of X zeolite, Y zeolite, and A zeolite is disclosed.... | 05/13/1986 |
| 4571440 | Continuous process for the production of alkylene glycol in the presence of organometalate A continuous process for making alkylene glycols by the hydrolysis of alkylene oxides in the presence of selectivity-enhancing organometalate wherein the alkylene glycol-containing hydrolysis product contains organometalate comprises recovering organometa... | 02/18/1986 |
| 4560813 | Processes for the production of alkylene glycol in the presence of organometalate In processes for making alkylene glycols by the hydrolysis of alkylene oxides in the presence of selectivity-enhancing metalate anion-containing material, metalate anion can be recovered from the alkylene glycol-containing hydrolysis product by contact wi... | 12/24/1985 |
| 4544778 | Bulk separation of sorbitol by selective adsorption on zeolitic molecular sieves A process for the bulk separation of sorbitol from a solution of a carbohydrate mixture by selective adsorption on a zeolite molecular sieve having a faujasite type structure and having predominantly Ca++ cations in association with the AlO | 10/01/1985 |
| 4518396 | Method of dehydrating natural gas Disclosed is a method and associated apparatus by which glycols may be cleaned, particularly those which have been used to dehydrate natural gas. Glycol contaminated with water, hydrocarbons, salts such as sodium chloride, and other impurities is degassed... | 05/21/1985 |
| 4482761 | Bulk separation of inositol and sorbitol by selective adsorption on zeolitic molecular sieves A process for the bulk separation of inositol and/or sorbitol is disclosed which comprises the selective adsorption of same on certain types of zeolitic molecular sieves. The process is especially useful for separating inositol from aqueous solutions cont... | 11/13/1984 |
