Bayer Aktiengesellschaft

Bayer Materialscience Ag

Haarmann & Reimer Gmbh

Rainer Neumann

Frieder Heydenreich

Michael Prein

Rolf Lanze

Tony Van Osselaer

Michael B&ouml;diger

Steffen K&uuml;hling

Hans-Helmut Schwarz

Dieter Habich

Arnold Paessens

Gerhard Fennhoff

Jutta Hansen

Gert Streissle

Jurgen Reefschlager

Dieter Freitag

Volker Serini

Hermann Kauth

Ulrich Blaschke

Stefan Westernacher

Gerhard Friedhofen

Michael Bödiger

Wolfgang Podszun

Klaus Horn

Reinhold M Klipper

Wilfried Haese

Michael Matzke

Heiko Herold

Ralf Hufen

Christian Kords

Alfred Eitel

Clemens Casper

Ulrich Schnegg

Hartwig Muller

Jurgen Heuser

Rainer Bellinghausen

Klaus Frobel

Rudolf Wagner

Johan Vaes

Friedrich Bruhne

Karl-August Lipper

Walter Bockmann

Kamelia Karlou-Eyrisch

Wolfgang Wambach

Siegfried Zingel

Dieter Nachtsheim

Karl-Heinz Weber

Thomas Henkel

Thomas-J Schulze

Thomas J Schulze

Karl-Heinz Arnold

G&uuml;nter Holdenried

Nikolai Kostyszyn

Karl Morgenstern

Hans-Ludwig Fofonka

A process for the production of bisphenol-A having low concentration of sulphur is disclosed. The process comprise a) reacting phenol with acetone in the presence of a sulfonic acid ion exchanger to form a product mixture containing water, bisphenol-A/phenol adduct, phenol and sulfurous particles, and b) filtering the product mixture to separate the sulfurous particles to obtain a purified product mixture that contains water, phenol and bisphenol-A/phenol adduct. In one embodiment of the process further comprise distilling the purified product mixture to remove the water to obtain a first material system that contains said adduct and phenol, crystallizing the adduct, and removing the phenol by filtration using a filtering apparatus to obtain crystalline adduct. In a yet additional embodiment the process comprise crystallizing the purified product mixture to obtain a second material system that contains crystalline adduct, water and phenol and removing the phenol and water by filtration using a filtering apparatus to obtain crystalline adduct.

Production of bisphenol-A with reduced sulfur content

A process for producing bisphenol A is disclosed. The process entails a) reacting phenol with acetone in the presence of an acidic catalyst to form a reaction mixture that includes bisphenol A and water, and b) removing water from the reaction mixture by distillation in a column to obtain a bottom product, and c) separating bisphenol-A/phenol adduct from the reaction mixture by crystallization and filtration. The bottom temperature of the column is 100 to 150&#xb0; C., the overhead temperature of the column is 20 to 80&#xb0; C., the absolute pressure is 50 to 300 mbar at the head of the column and 100 to 300 mbar at the bottom of the column, and wherein said (c) is carried out before or after said (b).

Dewatering of circulatory flows in the production of bisphenol A

The present application relates to a process for producing high-purity bis(4-hydroxyaryl)alkanes from adducts of bis(4-hydroxyaryl)alkanes and aromatic hydroxy compounds, which are obtained by acid-catalysed reaction of the aromatic hydroxy compounds with ketones.

Bis(4-hydroxyaryl)alkanes

The application relates to a process for producing high-purity bis(4-hydroxyaryl)alkanes from adducts of bis(4-hydroxyaryl)alkanes and aromatic hydroxy compounds, which are obtained by acid-catalysed reaction of the aromatic hydroxy compounds with ketones.

Bisphenol phenol adducts

The present invention provides crystals of an adduct of a bisphenol and a phenol and methods of producing those crystals. The crystals may find use in preparing bisphenols.

Method for producing bisphenols

The present invention provides mixtures containing bisphenol A, methods for the production thereof. The mixtures of the present invention may find use in the production of polymeric materials.

Substance mixture containing bisphenol A

A process for the production of 2,2-bis(4-hydroxyphenyl)propane (BPA) is disclosed. The process that entails reacting acetone with phenol in the presence of cross-linked sulfonated polystyrene resins is characterised in that BPA is separated from the reaction solution downstream of the reaction unit by means of a multi-stage vacuum distillation and a subsequent single- or multi-stage layer crystallisation. The by-product stream with accumulated by-products is returned downstream of the reaction unit.

Bisphenol production

Monodisperse cation-exchangers and anon-exchangers are conditioned by a process and thereafter used as catalysts and for the production of bisphenols.

Method for conditioning ion exchangers

2,2-bis(4-hydroxyphenyl)propane (BPA) is produced by reacting acetone and phenol in the presence of cross-linked sulfonated polystyrene resins and then separating the BPA off from the reaction solution.

Method for the production of bisphenol-a

A device for exchanging a die plate of a molten bisphenol A prilling tower is described. The device comprises: (a) at least two die plates; (b) a guide which is in contact with the die plates; and (c) a drive mechanism, wherein the drive mechanism moves the die plates linearly and serially between an operating position and an exchange position along the guide. Also described is a process of automated operation of the device at the top of a bisphenol A prilling tower.

Device for exchanging a die plate of a prilling tower and method for the automatic exchange

A method for producing bisphenol A in prill form is disclosed. Molten bisphenol is top-fed into a prilling tower via a plate containing a plurality of nozzles. A gas coolant guided through a circuit is led into said tower in a counter flow direction. The prills are cooled to about room temperature, collected at the bottom of the tower and removed. Also disclosed is the device for carrying out the inventive method and the prills thus produced.

Method and device for producing bisphenol a prills and bisphenol a prills produced according to this method

A process for fluidizing bisphenol dust is disclosed. The process entails adding 0.1 to 10 parts by weight of water per 1 part by weight of bisphenol dust. Also disclosed is a process for preparing a bisphenol wherein the fluidized bisphenol dust according to the invention is introduced before, during or after reaction of a phenol with a carbonyl compound.

Fluidised bisphenol dust

A container made of polycarbonate resin is disclosed. The container is characterized in that the polycarbonate is prepared by the phase interface process that is characterized in that the aqueous solution of an alkali salt of a bisphenol used, contains dissolved oxygen in an amount less than 150 ppb. The process for making the container is also disclosed.

Polycarbonate containers

A process for the commissioning of a process for the production of 2,2-bis(4-hydroxyphenyl)propane is disclosed. The process that entails reacting phenol with acetone in the presence of sulfonated cross-linked polystyrene resins is characterized in that the commissioning takes place with an acetone concentration reduced below, and a phenol concentration increased above, that of the optimal sustained operation state, with a reduced quantitative throughput, and in that with temperature control, the reactant quantity and the acetone content of the reactor feed are subsequently increased until the sustained operating state is reached.

Initiation method of a method for producing 2,2-bis(4-hydroxyphenyl)propane

The invention relates to crosslinked bead polymers doped with superparamagnetic iron oxide, to a process for the preparation of the bead polymers, and to the use thereof in nucleic acid diagnosis.

Superparamagnetic bead polymers

Growing community of inventors

Krefeld, Germany

Rainer Neumann