Basf Aktiengesellschaft

Basf Se Corporation

Gunther Windecker

Alexander Weck

Michael Hesse

Stephan Schlitter

Rolf Pinkos

Markus Rösch

Rolf-Hartmuth Fischer

Holger Borchert

Nils Bottke

Gunnar Heydrich

Olga Schubert

Markus Roesch

Markus Schubert

Michael Steiniger

Jens Weiguny

Sabine Borchers

Dany Vanden Hautte

Gerd Kaibel

Klaus Harth

Thomas Krug

Heiko Urtel

Jörg Heilek

Henrik Junicke

Ellen Dahlhoff

Jens Heimann

Sylvia Huber-Dirr

Hans-Martin Polka

Wolf-Steffen Weiβker

Jochen Pfeifer

Thierry Lurquin

Thilo Buntrock

Ralf Freyberger

Wolf-Steffen Weißker

The present invention relates to a process for separating off solvents from solvent-comprising hydrogenation outputs from a catalytic hydrogenation process, which comprise at least one water-soluble hydrogenation product having at least one alcohol, lactone, ether, lactam or amino group in a solvent which is immiscible or not completely miscible with water and has a boiling point below 100&#xb0; C., wherein water is added to the hydrogenation output, the solvent-comprising phase is separated off and recirculated to the hydrogenation.

Process for working up solvent-containing hydrogenation product mixtures

Processes for decreasing fumaric acid deposits in preparing maleic anhydride by heterogeneously catalyzed oxidation of a hydrocarbon with molecular oxygen. Maleic anhydride is absorbed from the crude mixture in an absorbent in an absorption column and desorbed in a desorption column, the entirety or portion of absorbent depleted in maleic anhydride, for controlled precipitation of fumaric acid, being cooled and/or concentrated by evaporating a portion of absorbent such that the difference between the concentration of fumaric acid in the recycle stream at the outlet of the desorption column under existing conditions and the equilibrium concentration of fumaric acid according to the solubility curve after cooling and/or evaporation of a portion of absorbent is &#x2267;250 ppm by weight, and the fumaric acid precipitated as a solid is removed completely or partly from the absorbent recycling system and the fumaric acid-depleted absorbent is recycled completely or partly to the absorption column.

Process for separating off fumaric acid and other minor components during the production of maleic anhydride

What is described is a process for obtaining maleic anhydride by distillation from a solution of maleic anhydride in a high-boiling absorbent which has been obtained by gas phase oxidation of a hydrocarbon and at least partial absorption of the oxidation products into the absorbent, by The maleic anhydride obtained as a side draw has a low content of acrylic acid and acetic acid.

Process for obtaining maleic anhydride by distillation

The invention relates to a method of controlling a hydrogenation of a starting material in a hydrogenation reactor, in which the amount of hydrogen reacted in the hydrogenation is firstly determined, the ratio of the amount of hydrogen reacted to the amount of starting material fed in is then derived, this ratio is compared with a prescribed value and, finally, at least one process parameter is altered if the ratio of the amount of hydrogen reacted to the amount of starting material fed in deviates by a prescribed amount from the prescribed value.

Method for controlling hydrogenation

The invention relates to a catalyst provided in the form of an extrudate, which contains 5 to 85% by weight of copper oxide and comprises, in the active material and as binders, the same oxidic carrier material. The invention also relates to the use of the catalyst for hydrogenating carbonyl compounds.

Catalyst extrudates based on copper oxide and their use for hydrogenating carbonyl compounds

The present invention provides a process for distillatively purifying tetrahydrofuran in the presence of a polar solvent.

Method for the distillative processing of tetrahydrofuran

Catalyst in the form of an extrudate which comprises from 5 to 85% by weight of copper oxide and in which the same oxidic support material is present in the active composition and as binder, and the use of the catalyst for the hydrogenation of carbonyl compounds.

A process for variably preparing mixtures of optionally alkyl-substituted BDO, GBL and THF by two-stage hydrogenation in the gas phase of Cdicarboxylic acids and/or derivatives thereof, which comprises

Method for the production of defined mixtures of THF, BDO and GBL by gas phase hydrogenation

Crude water-containing tetrahydrofuran is purified by passing the crude tetrahydrofuran through three distillation columns, withdrawing water from the bottom of the first column, recycling water-containing tetrahydrofuran from the top of the second column into the first column, passing a sidestream of the first column into the second column, recycling the bottom product of the third column into the first column, and withdrawing a distillate at the top of the first column. Additionally, a sidestream of the second column is passed into the third column and the purified tetrahydrofuran is recovered as the top product of the third column.

Method for purifying tetrahydrofuran by distillation

Optionally alkyl-substituted 1,4-butanediol is prepared from C-dicarboxylic acids and/or of derivatives thereof by: The catalysts employed in each of the hydrogenation stages comprise &#x2266;95% by weight of CuO, and &#x2266;5% by weight of an oxidic support, and the second reactor has a higher pressure than the first reactor.

Two-stage method for producing butanediol with intermediated separation of succinic anhydride

A process for coproducing alkyl-substituted or unsubstituted THF and pyrrolidones by catalytically hydrogenating C4-dicarboxylic acids and/or derivatives thereof in the gas phase in the presence of copper catalysts and reacting GBL with ammonia or primary amines to give pyrrolidones.

Method for the simultaneous production of tetrahydrofurans and pyrrolidones

The present invention relates to a process for preparing optionally alkyl-substituted 1,4-butanediol by two-stage catalytic hydrogenation in the gas phase of C-dicarboxylic acids and/or of derivatives thereof having the following steps:

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Ludwigshafen, Germany

Gunther Windecker