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| Number | Title | Issue Date |
| 8143458 | Processes for isolating or purifying propylene glycol, ethylene glycol and products produced therefrom Processes for separating butanediols from glycols are disclosed, as well as products and compositions resulting therefrom. ... | 03/27/2012 |
| 7307194 | Method for producing 1, 6 hexane diol The present invention provides a process for preparing 1,6-hexanediol from a carboxylic acid mixture which comprises adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols and is obtained as a by-product in the oxidation of cyclohexane to cyclo... | 12/11/2007 |
| 7301058 | Method for increasing yield in the production of polyvalent alcohols by splitting by-products containing acetal The invention relates to a method for increasing yield in the production of polyvalent alcohols, especially trimethylolpropane, obtained by condensing formaldehyde with a higher aldehyde. According to the inventive method, acid treatment is carried out on a mixture ... | 11/27/2007 |
| 7253326 | Method for preparing trimethylolproane The present invention relates to a method for preparing trimethylolpropane (TMP) comprising the steps of: 1) synthesizing trimethylolpropane by using n-butyl aldehyde, an aqueous solution of formaldehyde and an aqueous solution of alkali metal hydroxide through aldo... | 08/07/2007 |
| 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 |
| 7157607 | Manufacture of polytrimethylene ether glycol A process of manufacture of polytrimethylene ether glycol comprising: (a) polycondensing reactant comprising diol selected from the group consisting of 1,3-propanediol, 1,3-propanediol dimer and 1,3-propanediol trimer or mixtures t... | 01/02/2007 |
| 7112707 | Method for the isolation of trimethylolpropane from a reaction mixture Trimethylolpropane is isolated from a reaction mixture which has been obtained by reaction of n-butyraldehyde with formaldehyde in the presence of a base and, if appropriate, hydrogenation of the resulting mixture by distilling the mixture by means of a dividing wal... | 09/26/2006 |
| 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 |
| 7087800 | Process for producing a polyol A process for producing a polyol by reacting an aliphatic aldehyde with formaldehyde in the presence of a basic catalyst, which comprises a step of concentration which comprises removing water and unreacted formaldehyde from a reaction liquid by distillation; a step... | 08/08/2006 |
| 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 |
| 7057080 | Color index of multivalent alcohols by hydrogenation A process is provided for improving the color number of polyhydric alcohols, especially trimethylolpropane, by catalytic hydrogenation, the polyhydric alcohol used in the hydrogenation having been purified by distillation following its preparation, wherein the hydro... | 06/06/2006 |
| 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 |
| 6914164 | Method for the decomposition of ammonium formates in reaction mixtures containing polyol A method for removing trialkyl ammonium formate from a methylol alkanes obtained by condensation of formaldehyde with a higher aldehyde. The invention is characterized in that trialkyl ammonium formate is decomposed at a high temperature using catalysts containing a... | 07/05/2005 |
| 6727395 | Method for producing hexanediol A process for preparing 1,6-hexanediol from a carboxylic acid mixture comprising adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols which is obtained as by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol after water ex... | 04/27/2004 |
| 6692616 | Method for purifying trimethylolpropane, which is produced by hydrogenation, by means of continuous distillation A process is disclosed for the purification, by distillation, of trimethylolpropane originating from the hydrogenation of 2,2-dimethylolbutanal, said process including the following steps: (a) reaction of n-butyraldehyde with formaldehyde in the presence o... | 02/17/2004 |
| 6683224 | Process for the production of fatty alcohols Naturally occurring fats, oils and fatty derivatives are continuously hydrogenated to fatty alcohols in a fixed-bed reactor in the presence of hydrogen in excess and hydrogenation catalysts under static pressures of 50 to 300 bar and at temperatures of 16... | 01/27/2004 |
| 6623649 | Process for removing cyclic acetals from wastewater streams A process is provided which makes it possible to separate off cyclic acetals from wastewater streams to a substantial extent, by passing the wastewater stream over a heterogeneous acid catalyst.... | 09/23/2003 |
| 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 |
| 6586641 | Method for the decomposition of high boiling by-products produced in the synthesis of polyhydric alcohols A process is provided for increasing the yield in the preparation of polyhydric alcohols obtained from methylolated alkanals by hydrogenation, wherein derivatives of these alcohols are decomposed by adding 5 ppm to 1% by weight, preferably 100 to 1000 ppm... | 07/01/2003 |
| 6552232 | Process for conducting aldol condensation reactions in ionic liquid media The present invention is related to a method for forming aldol condensation products, comprising reacting at least one aldehyde starting material in the presence of an ionic liquid medium and a basic catalyst at a temperature range of from about -20° C. ... | 04/22/2003 |
| 6515036 | Method of decomposing a polyurethane A method of recovering a decomposition product from a polyurethane, the method comprising the steps of thermally decomposing a polyurethane into a liquid containing a polyol and a urea compound which is soluble in the polyol, and solids containing a urea ... | 02/04/2003 |
| 6489373 | Method for decomposition and recovery of polyurethane resin The present invention provides a method of recovering a polyamine compound and/or a polyol compound useful for starting materials of polyurethane resin in an industrially advantageous manner by first dissolving the polyurethane resin such as polyurethane ... | 12/03/2002 |
| 6448455 | TMP/Vapor pressure filtration The invention relates to a process for preparing trimethylolpropane with simultaneous formation of formate salts of the formula M(OOCH)n (I), where M represents the alkali metals lithium, sodium, potassium, rubidium, caesium and/or the alkaline ear... | 09/10/2002 |
| 6441254 | Process for preparing trimethylol compounds and formic acid The present invention relates to a process for preparing trimethylol compounds and formic acid by reaction of formaldehyde and aldehydes in the presence of a nitrogen base and distillation of the resulting reaction mixture in the presence of an auxiliary.... | 08/27/2002 |
| 6433192 | Method for producing mixtures of 1,4-butanediol, tetrahydrofuran and γ-butyrolactone In a process for preparing 1,4-butanediol, tetrahydrofuran and γ-butyrolactone by oxidation of butane to give a product stream comprising maleic anhydride, absorption of maleic anhydride from the product stream using a high-boiling alcohol to give a liqu... | 08/13/2002 |
| 6376725 | 1,3 butylene glycol of high purity and method for producing the same High purity 1,3-butylene glycol obtained from acetaldol by a liquid phase hydrogen reduction method, by adding a base to crude 1,3-butylene glycol free of high-boiling material, heat-treating the mixture and then distilling off 1,3-butylene glycol; and di... | 04/23/2002 |
| 6344592 | Method of producing highly pure trimethylolpropane A method of producing a highly pure trimethylolpropane from a crude trimethylolpropane obtained by a reaction of n-butyl aldehyde and formaldehyde in the presence of a basic catalyst in a two-stage process of an aldol condensation and a crossed Cannizzaro... | 02/05/2002 |
| 6316679 | Treatment of a composition comprising a trimethylolalkane bis-monolinear formal A process for treating a composition containing a substantial proportion of trimethyflolpropane bis-monolinear formal (TMP-BMLF) or trimethylolethane bis-monolinear formal (TME-BMLF), e.g., a heavy ends residue obtained from the purification of a crude tr... | 11/13/2001 |
| 6288287 | Process for preparing glycerol A process for preparing a glycerol from a crude glycerol comprising a glycerol, a diol and water, comprising feeding the crude glycerol to a preparation apparatus comprising two or more, serially connected flash towers and a distillation tower connected t... | 09/11/2001 |
| 6288286 | Method for producing hexanediol-1,6 A process for preparing 1,6-hexanediol from a carboxylic acid mixture obtained as by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-comprising gases and by aqueous extraction of the reaction mixture and compris... | 09/11/2001 |
| 6268539 | Manufacturing method of neopentyl glycol Method and apparatus for producing neopentyl glycol which comprises hydrogenating hydroxypivaldehyde in a reactor provided with a self-aspirator agitator device in the presence of a hydrogenation catalyst. The method has high yield of neopentyl glycol, an... | 07/31/2001 |
| 6265623 | Process for the reductive cleavage of linear and cyclic acetals especially formals The reductive cleavage of linear and cyclic acetals, especially formals, in an aqueous medium containing a formate takes place by hydrogenation with hydrogen in the presence of a heterogeneous hydrogenation catalyst at a pH value of less than 7 at a tempe... | 07/24/2001 |
| 6265624 | Process for preparing pentane-1,5-diol A process is described for the continuous recovery of substantially pure pentane-1,5-diol from a crude product stream (1) containing pentane-1,5-diol and δ-valerolactone. The feed stream (1) is continuously supplied to a vaporization zone (2) maintained ... | 07/24/2001 |
| 6201159 | Process for the continuous production of neopentyl glycol A neopentyl glycol having a purity of 98% or more is produced continuously by a process comprising the steps of: conducting an aldol condensation of isobutyraldehyde with an aqueous formaldehyde solution containing methanol in an amount of 0.1 to 15 wt % ... | 03/13/2001 |
| 6191320 | Finishing of neopentyl glycol In a process for finishing neopentyl glycol by cooling, crystallizing and comminuting a neopentyl glycol melt and subsequent packing of the resulting neopentyl glycol particles in storage or transport containers, the melt is cooled at the commencement of ... | 02/20/2001 |
| 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 |
| 6034284 | Producing method for trimethylolalkane High quality trimethylolalkane can be easily and efficiently produced at a high yield through a reaction between n-alkanal and formaldehyde in the presence of tertiary amine and water, in which a reaction mixture obtained after the reaction is heated up t... | 03/07/2000 |
| 6034285 | Producing method for trimethylolalkane High quality trimethylolalkane can be easily and efficiently produced at a high yield through a reaction between n-alkanal and formaldehyde in the presence of tertiary amine and water, in which a reaction mixture obtained aster the reaction is heated so t... | 03/07/2000 |
| 6018074 | Process for the preparation of polyalcohols A process for the preparation of polyalcohols comprises the stages: (a) Reaction of an alkanal or ketone with formaldehyde in aqueous solution in the presence of a tertiary amine, to form a formates containing polyalcohol product mixture, (b) removal of water,... | 01/25/2000 |
