Bayer Aktiengesellschaft

Bayer Materialscience Ag

Frieder Heydenreich

Rainer Neumann

Michael Prein

Rolf Lanze

Michael B&ouml;diger

Tony Van Osselaer

Steffen K&uuml;hling

Gerhard Fennhoff

Dieter Neuray

Peter Tacke

Friedrich Fahnler

Hermann Kauth

Rudolf Wagner

Helmut Korber

Michael Bödiger

Hans-Josef Buysch

Claus H Wulff

Klaus Horn

Reinhold M Klipper

Wilfried Haese

Heiko Herold

Ralf Hufen

Christian Kords

Gerd Fengler

Alfred Eitel

Helmut Judat

Ulrich Schnegg

Rainer Bellinghausen

Rob Eek

Johan Vaes

Norbert Bachem

Werner Breuer

Wolfgang Wambach

Lothar Klein

Hans-Jurgen Meissner

G&uuml;nter Jeromin

G&uuml;nter Holdenried

Nikolai Kostyszyn

Hans-Ludwig Fofonka

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 device for mixing and reacting multiphase gaseous and liquid mixtures is disclosed. The device comprise in sequence a first inflow cylindrical space, at least one cylindrical chamber tapering towards said cylindrical space, a second cylindrical space positioned perpendicularly to said first cylindrical space, and an outflow space. Also disclosed is a method of using the device, in particular in the interfacial process for preparing diphenyl carbonates or polycarbonates.

Device for mixing and reacting multiphase gaseous and liquid mixtures and use of this device

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

Process for the removal of dissolved oxygen from phenol

A process of preparing bisphenol A having low residual contents of oxygen and phenol is described. The process involves: (a) melting mixed crystals of bisphenol A and phenol under a nitrogen atmosphere at a temperature of 100&deg; C. to 120&deg; C.; (b) feeding continuously the melt formed in step (a) into the top of a distillation unit under conditions of 120&deg; C. to <160&deg; C. and a pressure of >80 mbar to 200 mbar; (c) feeding contemporaneously with step (b) nitrogen into the bottom of the distillation unit; (d) allowing the melted feed material and the nitrogen feed to contact each other within the distillation unit, thereby forming a concentrated melt material having (i) a phenol content reduced to 10 to 25 wt. %, and (ii) a reduced oxygen content (e.g., an oxygen content of <1 ppm); and (e) optionally passing a stream of nitrogen through the concentrated melt material under conditions of at least atmospheric pressure, 180&deg; C. to 220&deg; C. and a nitrogen partial pressure of 1 to 1.5 bar, thereby removing residual phenol from the concentrated melt material (e.g., resulting in a phenol content of <50 ppm). The melted material having reduced oxygen and phenol contents may be further processed, for example, into pellets.

Method for producing bisphenol-A

Growing community of inventors

Düsseldorf, Germany

Frieder Heydenreich