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7572376 |
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,...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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.
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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.
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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4456774 |
Bulk separation of polyhydric alcohols by selective adsorption on zeolitic molecular sieves
Mannitol is separated from admixture with galactitol and/or from sorbitol by selective adsorption on cationic forms of zeolite X and zeolite Y.
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4398046 |
Glycol purification with minimal pH drop
Standard activated carbons have been commonly employed in the purification of contaminated glycol scrubbing solutions used in a liquid-liquid extraction process for the manufacture of...
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4260827 |
Process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds
The invention is directed to a process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds containing calcium or lead compounds or mixtures thereof. Methanol...
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4246431 |
Process for recovering xylitol from end syrups of the xylitol crystallization
A process for extracting xylitol from the end syrups of the xylitol crystallization by subjecting the end syrup to chromatographic separation, whereby it will be decomposed into two or more...
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4239922 |
Xylose and xylitol separately purified in same ion exchanger
A process for producing polyalcohols such as xylite from deciduous wood wherein the wood is hydrolyzed with dilute mineral acid to produce a sugar solution which is deionized and decolorized in an...
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4066711 |
Method for recovering xylitol
A method for preparing pharmaceutical grade xylitol from an aqueous solution containing mixtures of polyols including xylitol which comprises subjecting the solution to a crude crystallization and...
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4062900 |
Process for preparing butanediol and/or butenediol
Butanediol and/or butenediol are prepared by hydrolyzing diacetoxybutane and/or diacetoxybutene in the presence of a cation-exchange resin and recovered by fractional distillation. By the treatment...
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4008285 |
Process for making xylitol
A method for recovering xylitol from pentosan-, preferably xylan-containing raw materials including the steps of hydrolyzing the raw material, purifying the hydrolysate by ion exclusion and color...
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3980719 |
Process for obtaining xylitol from natural products containing xylan
Xylitol which is useful as a sugar substitute is produced from xylan containing natural products by: acid hydrolyzing xylan to xylose; concentrating the hydrolysis solution to remove acetic acid...
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3970712 |
Hydrolysis of oat husks
A process for the hydrolysis of oat husks is carried out with alkali metal hydroxide or alkali metal chlorite in a first stage and with mineral acid in a second stage to provide D-(+)-xylose. The...
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3917720 |
Continuous process for the production of a diol from a diol ester
A continuous process for the production of a diol from a diol ester by hydrolysis in the presence of an acidic cationic exchange material.
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3880939 |
Continuous process for the production of a diol from a diol ester
A continuous process for the production of a diol froml a diol ester by alcoholysis, which comprises feeding the ester and an alcohol into a reactor containing an acidic cationic exchange material...
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3864406 |
Process for the production of mannitol and sorbitol
A method for separating mannitol and sorbitol from a solution containing mannitol and sorbitol, including the step of chromatographic fractionation to provide an aqueous solution containing a high...
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