Basf Aktiengesellschaft

Basf Se Corporation

Heinz Auer

Bernd Bessling

Maximilian Vicari

Hans Hasse

Hans Hammer

Friedrich Sauer

Till Adrian

Gerhard Wagner

Thomas Wettling

Lothar Franz

Wolfgang Franzischka

Werner Weinle

Stephan Scholl

Dirk Borchers

Thomas Mayer

Johann-Peter Melder

Franz Merger

Hugo Fuchs

Leopold Hupfer

Alexander Weck

Michael Schulz

Josef Ritz

Claus-Ulrich Priester

Joachim Thiel

Theodor Weber

Gabriele Iffland

Juergen Paetsch

Michael Kopietz

Karl Fischer

Peter Hettinger

Erwin Brunner

Bernd Guettes

Stefan Dinsch

Juergen Winkler

Ulrich Kalck

Ulrich Kanne

Simon A Jones

Winfried Terjung

Ulrich-Dieter Pessel

Gerd Hoeppner

Monika Wetterling

Paul Pijl

J&uuml;rgen Ciprian

Siegfried Kruger

Lutz Hilprecht

Klaus Beiser

Axel Werner Polt

Jochen Kellenbenz

J&uuml;rgen Pl&uuml;ckhan

Alan Handerman

Heribert Deck

Andre De Vos

Jürgen Dahlhaus

Jens Bruhn

Sebastian Zeck

Jurgen Pluckhan

Ulrich Loffler

Gunter Spiegel

Rubens Ballenweg

Gerhard Brudi

Klaus Gieselberg

The invention relates to an apparatus and a process for the preparation of anhydrous or substantially anhydrous formic acid. This apparatus is constructed partly or entirely of substantially zirconium-free materials. The extractant employed is a liquid of the general formula I where the radicals Rand Rare alkyl, cycloalkyl, aryl or aralkyl groups, or Rand Rjointly, together with the N atom, form a heterocyclic 5- or 6-membered ring, and only one of the radicals is an aryl group, and where Ris hydrogen or a C&#x2013;C-alkyl group. The apparatus has a synthesis reactor (), a hydrolysis reactor (), three distillation devices () and an extraction device ().

Material for a facility for the production of anhydrous formic acid

A process for working up a liquid reaction discharge of the cationic polymerization of isobutene, which substantially comprises polyisobutene, unconverted isobutene and, if required, an inert diluent, is described. Problems with foam formation when the unconverted isobutene is being distilled off are avoided if the heated reaction discharge is let down into a flash container and/or not more than 900 m/h of vapor are expelled per square meter of liquid surface and/or the resulting foam is destroyed, for example in a wet cyclone.

Separation of isobutene non-reacted during polymerization of isobutene

A polyisobutene composition having a global maximum of the differential molecular weight distribution curve at a molecular weight Mof from 3 500 to 8 000 is described, which comprises at least one local maximum at a molecular weight of from 112 to 560. The isobutene oligomers present act as flow improvers and boiling assistants. They are added to higher molecular weight isobutene polymers, preferably before or in the course of a distillation, for removing unconverted isobutene and/or an inert diluent.

Polyisobutene composition

A process for working up a liquid reaction discharge of the cationic polymerization of isobutene, which substantially comprises polyisobutene, unconverted isobutene and an inert diluent, in which the reaction discharge is heated and is let down into a flash container, is described, the reaction discharge separating, as a result of the flashing, into a polyisobutene-containing liquid phase and a gas phase containing the main amount of the isobutene contained in the reaction discharge and of the diluent.

Method for the processing of a liquid reaction discharge of the cationic polymerization of isobutene

A process for the preparation of highly reactive polyisobutenes is described, in which isobutene is polymerized in the presence of a complex of boron trifluoride and at least one cocatalyst in a liquid organic phase at a reaction temperature of from &#x2212;60 to &#x2212;4&#xb0; C. and water is added in two stages to the organic phase for catalyst deactivation and catalyst extraction.

Method for producing highly reactive polyisobutenes

A description is given of a process for preparing methyl formate by reacting excess methanol with carbon monoxide under superatmospheric pressure and at elevated temperature in the presence of alkali metal methoxide or alkaline earth metal methoxide as catalyst in a pressure-rated reactor, in which the use of at least two reactor elements, preferably operated in countercurrent, at about 100&#xb0; C. and a pressure of about 100 bar in combination with a solids-free desalting of the reaction product makes possible very economical, largely trouble-free production of methyl formate in any desired quality and with a very good production capacity. Furthermore, the process for solids-free desalting and apparatuses for carrying out this process are described.

Method for the continuous production of methyl formate

The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid, in which firstly aqueous formic acid is prepared by hydrolysis of methyl formate and is freed from water in the subsequent work-up. The process has the special feature that steam, which is employed for the hydrolysis of methyl formate and for heating a distillation column serving for work-up, is also used as stripping steam for waste-water stripping. The stripped waste water is produced during work-up.

Waste water treatment in a method for producing formic acid which is free of water

The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid, in which firstly aqueous formic acid is produced by hydrolysis of methyl formate, with the methanol content in the methyl formate having been reduced in advance. The process according to the invention has the special feature that&#x2014;before the hydrolysis of the methyl formate&#x2014;the methanol content of the methanol-containing methyl formate is reduced in a distillation column, this distillation column simultaneously being employed for other separation functions during work-up of the formic acid.

Method for producing anhydrous formic acid

The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid in which, during the work-up, a compound of the general formula Iwhere the radicals R1 and R2 are alkyl, cycloalkyl, aryl or aralkyl groups, or R1 and R2 jointly, together with the N atom, form a heterocyclic 5- or 6-membered ring, and only one of the radicals is an aryl group, and where R3 is hydrogen or a C1-C4-alkyl group,is employed simultaneously as extractant for formic acid and as antifoam for a distillation process.

Utilization of an extracting agent as antifoaming agent in the production of anhydrous formic acid

In a process for purification of ethylene oxide by distillation an aqueous mixture comprising ethylene oxide, formaldehyde and at least 5% by weight of water is introduced via a feed into a distillation apparatus comprising at least one distillation column, the mixture being introduced at a height above the bottom of at least 8 theoretical stages, the ethylene oxide is taken off at the top and in the bottom phase a mixture is obtained which contains less than 5% by weight of ethylene oxide.

Pure ethylene oxide distillation process

Method for cleaning off-gas flows

The present invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols in the presence of an alkali metal- or alkaline earth metal-containing catalyst, which entails the appropriate acyloxy-containing polymer being introduced together with the alcohol and the catalyst into a first prereactor (I) and converted therein at least partly to the hydroxyl-containing polymer, and the reaction solution being fed into the upper zone (IIa) of a distillation column (II) into whose lower zone (IIb) alcohol in vapor phase is additionally fed. This involves a phase exchange at the coherent and the disperse phase at the transition from the prereactor to the distillation column. Preferably, in addition to the first prereactor, a further 3 prereactors are used which serve as holdup reactors.

Production of polytetrahydrofuran with terminal hydroxyl groups by changing the continuous and dispersed phase

A process for treating polyether polyols prepared in a conventional manner by base-catalyzed reaction of H-functional initiator substances with alkylene oxides comprises a combination of a thermal-reactive step at a pH of less than 7 and a temperature above 60&deg; C. and a thermal-distillative step in a countercurrent column using a purifying agent. The polyether polyols prepared according to the invention are used for producing low-fogging and low-odor PUR foams.

Treatment for polyether polyols

Process for distilling ethylene oxide

Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, wherein

Isolation of neopentyl glycol hydroxypivalate (NGH)

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Neulussheim, Germany

Heinz Auer