Bayer Aktiengesellschaft

Bayer Ag Konzernverwaltung Rp

Werner Verhoeven

Domien Sluyts

Georg Ronge

Kaspar Hallenberger

Tony Van Osselaer

Gabriel Denecker

Claus H Wulff

Jurgen Kirsch

Gerhard Fennhoff

Steffen Kuhling

Michael Prein

Alfred Eitel

Siegfried Anders

Christine Mendoza-Frohn

J&uuml;rgen Heuser

Jurgen Hinz

Hartmut Lower

Johan Vaes

Kurt-Peter Meurer

Rob Eek

Joel Leuridan

Armand Verbueken

Ignace Hooftman

Dirk M&uuml;ller

Lutz Gottschalk

Wilhelm Nehoda

Willy Van Herck

Johannes-Peter Sch&auml;fer

A method for producing a bisphenol is disclosed. The method entails reacting in at least one first reactant selected from a first group consisting of phenol and substituted phenols with at least one second reactant selected from a second group consisting of ketones and diols, in the presence of hydrogen chloride catalyst and volatile sulphur compound having an SH bond as co-catalyst. The reaction product is a mixture that contains bisphenol, first reactant and second reactant. The catalyst and co-catalyst and water of reaction are separated by distillation. The method is characterized by the high reaction rates and selectivities.

Method for producing bisphenols

Nitrate-containing (contaminated) solutions are reduced with SO gas in the presence of an at least equimolar amount of NH or ammonium salt.

Process for the reduction of concentration of nitrates and/or nitrogen-containing compounds by means of SO2

Method of dispensing moist, sticky or statically charged bulk material into a fluid pervious container having an opening for receiving said bulk material, which comprises conveying a bulk material, as a suspension or dispersion in a fluid, from a reservoir, and introducing said suspension or dispersion into the fluid-pervious container through said opening in the container to pass the fluid component of the suspension or dispersion through and out of the fluid-pervious container while the retaining the bulk material within the container, and recirculating the fluid to the reservoir.

Method of loading moist, sticky bulk material into a fluid pervious container

The present invention relates to a process for the production of bis(4-hydroxyaryl)alkanes by an acid-catalyzed reaction between aromatic hydroxy compounds and ketones, in which the temperature, ketone content and water content of a liquid reaction mixture are adjusted by means of a suitably composed gas phase.

Method for producing bis(4-hydroxyaryl)alkanes

This invention relates to a process for the purification of waste waters containing organic and, should the situation arise, inorganic sulphur compounds, which waste waters contain a proportion of mercaptobenzothiazole and/or derivatives thereof and, should the situation arise, a proportion of benzothiazole and/or derivatives thereof and/or mercaptobenzimidazole and/or derivatives thereof and, should the situation arise, thiosulphate, whereby the waste waters are treated with an extracting agent comprising salts of aliphatic amines and aliphatic and/or aromatic hydrocarbons.

Process for the purification of waste waters containing organic and

The invention relates to a process for the production of multilayer plastic sheets from special branched polycarbonates.

Process for the production of multilayer plastic sheets

A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.

Process for the purification of bisphenol

High-grade titanium dioxide is produced by

Process for the production of high-grade titanium dioxide by sulfate

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Kalmthout, Belgium

Werner Verhoeven