Basf Se Corporation

Michael Lorenz

Robert Baumann

Johann-Peter Melder

Hermann Luyken

Thomas Krug

Boris Buschhaus

Stephanie Jaegli

Markus Jegelka

Barbara Becker

Gordon Brasche

Gerhard Olbert

Holger Friedrich

Andreas Woelfert

Michael Bock

Sophie Maitro-Vogel

Silke Annika Koehler

Andreas Wölfert

Gerrit Waters

Axel Franzke

Jon S Speier

Tobias Urban

Andreas Weickgenannt

Geert Janssens

Andreas Spiegel

Jochen Gauer

Wolfgang Gmeiner

Marcus Reble

Andreas WÖLFERT

The present invention relates to a reactor R with apparatus D, the latter comprising a gas- and/or liquid-permeable tray B, in the edge region of which there is disposed a lateral boundary W which fully encloses the tray B and forms a volume V comprising catalytic and/or noncatalytic shaped bodies (F), wherein there is at least one braid made of precious metal and/or base metal on the upstream side opposite the tray B, and the catalytic and/or noncatalytic shaped bodies (F) are selected from (i) shaped bodies (F) in the form of straight prisms, the footprint of which is selected from triangle, rectangle, hexagon or fragments of these polygons, and (ii) a combination of the shaped bodies (F) with shaped bodies (F) that are smaller than the shaped bodies (F), wherein groups of m to n shaped bodies (F), m and n being an integer from 3 to 30 with n&#x3e;m, are framed in a metal cassette open in the upstream direction and closed in the downstream direction by a gas-permeable tray, in a virtually seamless manner with side face to side face and with their longitudinal axis aligned in vertical direction, virtually completely covering the cross section of the tray, to form modules (M), and the modules (M), optionally with cooperation of a joint filler material, with vertical alignment of the longitudinal axis of the shaped bodies (F), are joined to one another virtually seamlessly in a mosaic-like manner.

Modular catalyst monoliths

The present invention relates to beta-naphthol ether sulfonic acids or salts thereof having the general formula (I) R&#x2014;O-(AO)&#x2014;CH&#x2014;CH&#x2014;S(O)M (I), where R, AO, n and M have the definitions stated in the claims and in the description, to mixtures thereof, to aqueous solutions and to electrolytes comprising them, to processes for preparing them and to the use of these.

Beta-naphthol ether sulfonates, processes for preparing them and use thereof as brightness improvers

The invention relates to polyphenyl polymethylene polyisocyanates having an NCO number of at least 29% comprising less than 2% by weight ureas, less than 8% by weight carbodiimides or uretonimines and less than 1000 ppm organic chlorine compounds. The polyphenyl polymethylene polyisocyanates can be prepared according to the invention by reacting The polyphenyl polymethylene polyisocyanates can further be prepared according to the invention, prior to the thermal cleavage, by removing compounds having free amino groups or urea groups present in the carbamate crude mixture from the carbamate crude mixture by filtration of the carbamate crude mixture comprising the polyphenyl polymethylene polycarbamates over a solid acidic adsorbent in the presence of an acid dissolved in the carbamate crude mixture.

Low by-product content polyphenylene polymethylene polyisocyanates

The present invention relates to a process for preparing ethylenediamine (EDA), where the process comprises the steps a) to c). In step a), formaldehyde is reacted with hydrocyanic acid (HCN) to form formaldehyde cyanohydrin (FACH), where the hydrocyanic acid is completely free or largely free of sulfur dioxide (SO). The FACH prepared in this way is reacted with ammonia (NH) to form aminoacetonitrile (AAN) in step b), whereupon a hydrogenation of AAN in the presence of a catalyst to form EDA is carried out in step c).

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The present invention relates to a process for purifying ethylenediamine (EDA) by distillation, wherein the process comprises the steps a) and b). In step a), a mixture (G1) comprising water, EDA and N-methylethylenediamine (N-MeEDA) is fed into a distillation apparatus (D1), and the major part of the water comprised in the mixture (G1) is separated off overhead at a pressure of greater than 4.8 bara. From the bottom of (D1), the water-enriched mixture (G2) is fed into a distillation apparatus (D2) in step b). At the top of (D2), the major part of the N-MeEDA is distilled off. The stream (S3) obtained from the bottom of (D2) comprises EDA, with the components water and N-MeEDA comprised in the mixture (G1) having been largely or completely removed. Further distillation steps can optionally be carried out in order to obtain pure EDA, for example when diethylenetriamine (DETA) is additionally comprised in the mixture (G1). If ammonia is additionally comprised in the mixture (G1), an ammonia removal is preferably additionally carried out before carrying out the step a) in the process of the invention.

Method for the distillative purification of EDA

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Ludwigshafen, Germany

Michael Lorenz