Basf Se Corporation

Basf Aktiengesellschaft

Tilman Sirch

Gerd-Dieter Tebben

Rolf Pinkos

Steffen Maas

Stefan Rittinger

Michael Steiniger

Thomas Krug

Stephan Schlitter

Matthias Dernbach

Alexander Wartini

Michael Koch

Rolf-Hartmuth Fischer

Andrea Haunert

Todd C Spengeman

Johann-Peter Melder

Gerd Kaibel

Michael Röper

Heiko Urtel

Daniel Urbanczyk

Heinz Berbner

Hans D Zettler

Christophe Bauduin

Thorsten Johann

Armin Diefenbacher

Alfred Krause

Erhard Guenther

Daniel Breuninger

Maria Guixa Guardia

Olivier Abillard

Gerlinde Tischer

Rolf Tompers

Wolfram Stüer

Franz Borgel

Ludwig E Heck

Hans Etling

Jeffrey T Andress

Todd Gasiorowski

Stephanie A Bejune

Gerd-Dieter Dr Tebben

Stephanie Bejune

Michael Steininger

A process is provided for recovering components from a low boiler mixture which is obtained in the distillation of hydrogenation effluents from the preparation of polymethylols, by multistage distillation of the low boiler mixture having a tertiary amine, water, methanol, a polymethylol, a methylolalkanal, an alcohol and an alkanal with a methylene group in the alpha position to the carbonyl group. A first distillation stage involves separating the low boiler mixture into a higher-boiling, predominantly water-rich fraction and into a lower-boiling aqueous organic fraction having the tertiary amine. A second distillation stage involves separating the aqueous organic fraction from the first distillation stage into a predominantly amine-containing fraction and a further amine-depleted fraction. The tertiary amine is trimethylamine or triethylamine and the bottom temperature in the second distillation stage is at least 110&#xb0; C.

Process for preparing polymethylols

The present invention relates to a process for distilling an aqueous polymethylol mixture which comprises a polymethylol of the formula (I)(HOCH)&#x2014;C&#x2014;R&#x2003;&#x2003;(I)in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, a tertiary amine, water and the adduct of tertiary amine and formic acid (amine formate), which comprises performing the distillation in a distillation column which is connected at the bottom to an evaporator, the bottom temperature being above the evaporation temperature of the monoester of formic acid and polymethylol (polymethylol formate) which forms during distillation. The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of polymethylol formate, and to the use thereof.

Method for preparing polymethylols

The present invention relates to a process for hydrogenating oligo- and/or polyesters obtainable by esterifying a DCS with a diol or diol mixture, said hydrogenation being performed in the presence of a catalyst whose catalyst precursor comprises copper oxide, aluminum oxide and at least one oxide of lanthanum, of iron, of tungsten, of molybdenum, of titanium or of zirconium, and to a process for preparing 1,6-hexanediol by catalytically hydrogenating ester mixtures which comprise, as main components, oligo- and polyesters of adipic acid and 6-hydroxycaproic acid, and are obtained by esterifying DCS with diols, especially 1,6-hexanediol or diol mixtures.

Method for producing 1,6-hexanediol by hydrogenation of oligo- and polyesters

The present invention relates to a process for purifying crude polymethylol which comprises polymethylol of the formula (I)(HOCH)&#x2014;C&#x2014;R&#x2003;&#x2003;(I)in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, and also hydroxy acid of the formula (IV) in which each R is independently as defined above, which comprises performing the purification in a distillation column, the bottom of the distillation column being connected to an evaporator with a short residence time. The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of an ester of polymethylol and of a hydroxy acid and to the use thereof.

Method for purifying crude polymethylols

The present invention provides a process for preparing &#x3b5;-caprolactone in a purity of more than 99% by cyclizing 6-hydroxycaproic esters in the liquid phase at from 150 to 400&#xb0; 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 &#x3b5;-caprolactone by distillation from the condensates.

Process for preparing &#x3b5;-caprolactone

The invention relates to a process for preparing &#x3b5;-caprolactone from 6-hydroxycaproic ester in the gas phase in the presence of activated carbon as a catalyst and subsequent distillation.

Process for preparing epsilon-caprolactone

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.

Process for preparing 6-hydroxycaproic esters

The preparation of hydroxypivalaldehyde is effected by aldolizing isobutyraldehyde with formaldehyde and subsequently working up the resulting reaction effluent by distillation, wherein the reaction effluent is fed to a distillation column which is operated at a top pressure in the range from 0.5 to 1.5 bar and in which a two-stage condensation is provided in the top region, in which the vapors are first conducted into a partial condenser operated at a temperature in the range from 50 to 80&#xb0; C., whose condensate is recycled at least partly into the distillation column, and in which the vapors uncondensed in the partial condenser are fed to a downstream condenser operated at a temperature in the range from &#x2212;40 to +30&#xb0; C., whose condensate is at least partly discharged.

Method for producing hydroxypivalaldehyde and neopentyl glycol

The present invention provides a process for preparing 1,6-hexanediol by hydrogenating dialkyl adipates, alkyl 6-hydroxycaproates, 1,4-cyclohexanedione and 4-hydroxycyclohexan-1-one as ester mixtures comprising impurities, by

Method for production of 1,6-hexanediol with a purity in excess of 99.5%

Process for the catalytic hydrogenation of methylolalkanals of the general formula where Rand Rare each, independently of one another, a further methylol group or an alkyl group having from 1 to 22 carbon atoms or an aryl or aralkyl group having from 6 to 33 carbon atoms, in the liquid phase by means of hydrogen over a hydrogenation catalyst, wherein hydrogen is used in a molar ratio to methylolalkanal of greater than 1.

Hydrogenation of methylolalkanals

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 cyclohexanone/cyclohexanol with oxygen or oxygen-containing gases and by water extraction of the reaction mixture, by esterification of the acids and hydrogenation, in which

Method for producing 1, 6 hexane diol

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 (high-boiling fraction) that is obtained by reprocessing, contains derivatives of said alcohols and has a higher boiling point than the respective alcohol, and the polyvalent alcohol is recovered from the acid-treated high-boiling fraction. The inventive method is characterised in that the water content of the high-boiling fraction amounts to between 20 and 90 wt. % in relation to the entire mixture of the high-boiling fraction and water.

Method for increasing yield in the production of polyvalent alcohols by splitting by-products containing acetal

The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.

Method for producing polyesterpolyols of polyvalent alcohols

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 wall column or a distillation column with a precolumn or a distillation column with an after-column. The process has low capital costs and a low energy consumption and gives reduced formation of high-boiling by-products.

Method for the isolation of trimethylolpropane from a reaction mixture

The present invention provides a process for preparing 1,6-hexanediol having a purity of &#x2267;99.5% by weight by catalytically dimerizing acrylic esters and catalytically hydrogenating the hexenedioic diesters obtained in this way to 1,6-hexanediol by

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Schifferstadt, Germany

Tilman Sirch