Patent application number | Description | Published |
20090137825 | METHOD OF PRODUCING A CARBOXYLIC ALKYL ESTER - The present invention relates to a novel process for preparing alkyl polycarboxylates from an aqueous solution of an ammonium salt of the polycarboxylic acid by reactive distillation, and to a process for hydrogenating the alkyl carboxylates prepared in this way. | 05-28-2009 |
20090187050 | METHOD FOR THE SEPARATION OF POLYMERIC BY-PRODUCTS FROM 1,4-BUTYNEDIOL - The present invention relates to a process for purifying 1,4-butynediol, which comprises compressing 1,4-butynediol to from 50 to 1500 bar, depressurizing it, waiting for phase separation to occur after depressurization and separating off the bottom phase, and a process for the hydrogenation of 1,4-butynediol to 1,4-butenediol and 1,4-butanediol using the purified 1,4-butynediol. | 07-23-2009 |
20100016643 | PROCESS FOR PREPARING 1,4-BUTANEDIOL - The present invention provides an integrated process for continuously preparing 1,4-butanediol, which comprises the following stages: | 01-21-2010 |
20100044626 | METHOD FOR PRODUCING PYRROLIDONES FROM SUCCINATES FROM FERMENTATION BROTHS - The present invention relates to a process for preparing a compound II or a composition comprising the compound II | 02-25-2010 |
20100048922 | PROCESS FOR ONE-STAGE PREPARATION OF 2-METHYLTETRAHYDROFURAN FROM FURFURAL OVER TWO CATALYSTS IN A STRUCTURED BED - The present invention provides a process for preparing 2-methyltetrahydrofuran by one-stage hydrogenation of furfural with a hydrogen-comprising gas in the presence of a structured bed of at least one copper catalyst and at least one catalyst which comprises at least one noble metal from groups 8, 9 and/or 10 of the periodic table of the elements applied on a support material. | 02-25-2010 |
20100099895 | PROCESS FOR ONE-STAGE PREPARATION OF 2-METHYLTETRAHYDROFURAN FROM FURFURAL OVER A CATALYST - The present invention provides a process for preparing 2-methyltetrahydrofuran by one-stage hydrogenation of furfural with a hydrogen-comprising gas in the presence of a supported catalyst which comprises at least one noble metal from groups 8, 9 and/or 10 of the periodic table of the elements. | 04-22-2010 |
20100101931 | PROCESS FOR PREPARING VERY PURE 1,4-BUTANEDIOL - The present invention provides a process for distillatively purifying crude aqueous 1,4-butanediol ( | 04-29-2010 |
20100168445 | PROCESS FOR PREPARING EPSILON-CAPROLACTONE - The present invention provides a process for preparing ε-caprolactone in a purity above 99%, in which 6-hydroxycaproic ester comprising from 0.5 to 40% by weight of adipic diester is cyclized in the gas phase at from 150 to 450° C. in the presence of oxidic catalysts and ε-caprolactone is obtained from the cyclization product by distillation. | 07-01-2010 |
20100240913 | PROCESS FOR PREPARING EPSILON-CAPROLACTONE - The present invention provides a process for preparing ε-caprolactone in a purity of more than 99% by cyclizing 6-hydroxycaproic esters in the liquid phase at from 150 to 400° C. and from 1 to 1020 hPa abs., and removing and condensing the compounds which are volatile under cyclization conditions, which comprises thermally treating the remaining bottom product of the cyclization in at least one further reactor, removing and condensing volatile compounds and obtaining ε-caprolactone by distillation from the condensates. | 09-23-2010 |
20100286399 | PROCESS FOR THE PREPARATION OF AN N-ALKYL LACTAM WITH IMPROVED COLOUR QUALITY - A process for preparing an N-alkyllactam with improved color quality, wherein from 0.01 to 10% by weight of a C | 11-11-2010 |
20100286411 | PROCESS FOR THE PREPARATION OF AN N-ALKYL LACTAM WITH IMPROVED COLOUR QUALITY - A process for preparing an N-alkyllactam with improved color quality, wherein from 0.01 to 10% by weight of a C | 11-11-2010 |
20100305339 | METHOD FOR PRODUCING LACTONES FROM DIOLS - The present invention provides a process for preparing lactones from optionally substituted, saturated aliphatic diols having from five to 20 carbon atoms between the two ring-closing hydroxyl groups by catalytic dehydrogenation and cyclization in the liquid phase over at least one catalyst. | 12-02-2010 |
20110015429 | PROCESS FOR PREPARING 6-HYDROXYCAPROIC ESTERS - The present application relates to an improved process for preparing 6-hydroxycaproic esters from the by-product mixtures which are obtained in the oxidation of cyclohexane to cyclohexanol and cyclohexanone with oxygen or oxygen-comprising gas mixtures. | 01-20-2011 |
20110124905 | 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 content of less than 500 ppm. | 05-26-2011 |
20110124925 | 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-hexanediol for preparing polymers. | 05-26-2011 |
20110124926 | PROCESS FOR PREPARING DIOLS BY HYDROGENATING A CARBOXYLIC ACID-COMPRISING MIXTURE BY MEANS OF COBALT-COMPRISING CATALYSTS - The present invention relates to a process for preparing diols by hydrogenating a mixture comprising carboxylic acid, carboxylic anhydrides and/or carboxylic esters/lactones by means of a cobalt-comprising catalyst, wherein alkali metal and/or alkaline earth metal ions are added to the hydrogenation feed, excluding alkali metal and/or alkaline earth metal ions of mineral acids. | 05-26-2011 |
20110237806 | PROCESS FOR PREPARING DELTA-VALEROLACTONE IN THE GAS PHASE - The process relates to a process for preparing delta-valerolactone (VLO) in the gas phase by catalytic dehydrogenation over at least two different catalysts. | 09-29-2011 |
20110263892 | PROCESS FOR PREPARING AN ISOCYANATE - The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process. | 10-27-2011 |
20110263907 | PROCESS FOR PREPARING 1,6-HEXANEDIOL - 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 of the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-comprising gases by water extraction of the reaction mixture, by esterification and hydrogenation to hexanediol, which comprises
| 10-27-2011 |
20120010419 | METHOD FOR PRODUCING 1,6-HEXANEDIOL AND CAPROLACTONE - The invention relates to a process for preparing 1,6-hexanediol and caprolactone, preferably with at least 99.5% purity, which are especially virtually free of 1,4-cyclohexanediols, from a carboxylic acid mixture which is obtained as a by-product of the catalytic oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-comprising gases and by water extraction of the reaction mixture, by hydrogenating the carboxylic acid mixture, esterifying and hydrogenating a substream to hexanediol and cyclizing 6-hydroxycaproic ester, the 1,4-cyclohexanediols being removed either in the course of fractionation of the esterification mixture or last from the caprolactone. | 01-12-2012 |
20120022298 | METHOD FOR PRODUCING 1,6-HEXANEDIOL - The invention relates to a process for preparing 1,6-hexanediol, preferably with at least 99.5% purity, which are especially virtually free of 1,4-cyclohexanediols, from a carboxylic acid mixture which is obtained as a by-product of the catalytic oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-comprising gases and by water extraction of the reaction mixture, by hydrogenating the carboxylic acid mixture, esterifying and hydrogenating a substream to hexanediol. | 01-26-2012 |
20120071624 | PROCESS FOR PREPARING 1,6-HEXANEDIOL - The invention provides 1,6-hexanediol having a proportion by weight of nitrogen of less than 5 ppm, and polymers obtained by reacting the 1,6-hexanediol with at least one reactive compound. The 1,6-hexanediol is obtained by distilling a mixture including 1,6-hexanediol and more than 500 ppm of at least one carboxylic acid, ester, or both, having a boiling point higher than that of the 1,6-hexanediol and being in contact with the 1,6-hexanediol at a temperature range greater than or equal to 100° C. for at least 5 minutes before, during, or before and during, the distillation, followed by collection of the 1,6-hexanediol. In certain embodiments of this invention, the 1,6-hexanediol has a proportion by weight of nitrogen of less than 3 ppm and less than 2 ppm. | 03-22-2012 |
20120073953 | PROCESS FOR ISOLATING TETRAHYDROFURAN - A process which isolates tetrahydrofuran from a stream of tetrahydrofuran, alkanol and high boilers, by: (a) separating off a first stream of tetrahydrofuran and alkanol as azeotrope in a first distillation stage; (b) feeding part of the first stream into a reactor for esterifying maleic anhydride, giving a second stream of tetrahydrofuran and monoalkyl maleate; (c) separating the second stream into a third stream of monoalkyl maleate and a fourth stream of tetrahydrofuran in a second distillation stage; (d) feeding the fourth stream of tetrahydrofuran from the second distillation stage and the part of the first stream from (a) which is not fed to the reactor into a third distillation stage to obtain a product stream of tetrahydrofuran and a sixth stream of tetrahydrofuran and alkanol; (e) recirculating the sixth stream from the third distillation stage into the first distillation stage or the reactor in (b). | 03-29-2012 |
20120178947 | PROCESS FOR HYDROGENATING 1,4-BUTYNEDIOL TO GIVE MIXTURES COMPRISING TETRAHYDROFURAN, 1,4-BUTANEDIOL AND GAMMA-BUTYROLACTONE IN THE GAS PHASE - Process for preparing tetrahydrofuran, 1,4-butanediol and/or gamma-butyrolactone by hydrogenation of 1,4-butynediol, wherein 1,4-butynediol is vaporized in a hydrogen-comprising gas stream and hydrogenated in gaseous form over at least one catalyst which comprises at least one of the elements of groups 7 to 11 of the Periodic Table of the Elements. | 07-12-2012 |
20120178948 | PROCESS FOR THE HYDROGENATION OF 1,4-BUTYNEDIOL TO TETRAHYDROFURAN IN THE GAS PHASE - The present invention relates to a process for the catalytic hydrogenation of 1,4-butynediol to tetrahydrofuran at at least the decomposition temperature of 1,4-butynediol, wherein 1,4-butynediol is vaporized in a hydrogen-comprising gas stream and is hydrogenated in gaseous form over at least one catalyst, comprising at least one of the elements from groups 7 to 11 of the Periodic Table of the Elements. | 07-12-2012 |
20130150591 | METHOD FOR PURIFYING N-ALKYL-SUBSTITUTED PYRROLIDONES BY HYDROGENATION - The invention relates to a method for purifying N-alkyl-substituted pyrrolidones which have contaminants with a higher degree of oxidation, by hydrogenation of the same and distillation. | 06-13-2013 |