Basf Aktiengesellschaft

Christian Tragut

Jochem Henkelmann

Gerd Kaibel

Alois Kindler

Hans-Josef Sterzel

Manfred Stroezel

Klaus Ebel

Rolf-Hartmuth Fischer

Ulrich Steinbrenner

Christoph Sigwart

Andreas Ansmann

Klaus Halbritter

Walter Dobler

Harald Rust

Udo Rheude

Martin Haubner

Rudolf Erich Lorenz

Matthias Eiermann

Carsten Oost

Melanie Brunner

Bernhard Bockstiegel

Heinz Etzrodt

Susanne Stutz

Werner Hesse

Thomas Domschke

Christian Knoll

Gerd Bohner

Melanie Maas-Brunner

Karl-Heinz Wostbrock

Klaus Reimer

Juan Aiscar

Eva Freudenthaler

Gabriele Anken

Crude ammonia is separated into a low boiler fraction, a high boiler fraction and an intermediate-boiling pure fraction by continuous fractional distillation in a distillation apparatus configured either as a dividing wall column or as a system of thermally coupled distillation columns. In the process of the present invention, the low boiler fraction is taken off at the top of the distillation apparatus. The intermediate-boiling pure fraction is obtained at a side offtake which is preferably provided with droplet precipitators. In addition, the gas loading of the distillation column is restricted so that the operating pressure is in the range from 2 to 30 bar and the F factor does not exceed 2.0 Pa.

Purification of ammonia by distillation

A process for preparing at least one unsaturated alcohol (B) comprises the steps (I) to (III) below:

Method for preparing acetylene alcohols and their secondary products

Higher &agr;,&bgr;-unsaturated alcohols are prepared by monoethynylation of a ketone by the NH /KOH method, if desired hydrogenation of the acetylene alcohol in the presence of hydrogen over a Pd-containing thin layer catalyst, purifying distillation of the hydrogenation product, preferably in a dividing wall column with recirculation of the unreacted ketone to the ethynylation step, and, if desired, preparation of higher alcohols having in each case 5 more carbon atoms in the chain by reacting the alcohols prepared by monoethynylation and, if desired, partial hydrogenation with alkyl acetoacetates diketene in a Carroll reaction to form ketones and using these as starting materials for the steps ethynylation, optional hydrogenation and fractional distillation.

Preparation of higher &agr;, &bgr;-unsaturated alcohols

Method for the single-step production of polytetrahydrofuran and tetrahydrofuran copolymers

The invention relates to a process for the preparation of organic disulfides by oxidation of mercaptans with sulfur dissolved in an organic disulfide using an amine as catalyst, where the mercaptans are used as &ldquo;crude mercaptan stream&rdquo; from a reaction of alcohols with hydrogen sulfide over a catalyst suitable for mercaptan synthesis. Furthermore, the invention relates to the use of the organic disulfides for the preparation of alkanesulfonic acids.

Process for the preparation of organic disulfides

Method of producing alkanesulfonic acid

Dimethyl sulfite is prepared by transesterification of a cyclic alkylene sulfite of at least 2 carbon atoms with methanol, in the presence or absence of a catalyst, by a process which is carried out continuously in a column.

Method of producing dimethyl sulfite

A method of distillation for separating a material which is solid at ambient temperature from a lower boiling and lower melting point material, and the apparatus.

Continuous isolation of a high-melting material by distillation

The invention relates to a method for producing alkyne diols by reacting ketones with acetylenic hydrocarbons in an organic solvent in the presence of a base which contains potassium alcoholates of primary and/or secondary alcohols. The alkyne diols are produced while forming adducts which precipitate out of the reaction mixture and which are comprised of alkyne monoalcohols and/or alkyne diols and a base. The stoichiometries of the reaction partners are selected such that gelatinous adducts are formed which comprise a spherical surface, whereby the reaction mixture remains agitable during the entire reaction.

Method for producing alkyne diols

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Wachenheim, Germany

Christian Tragut