Huels Aktiengesellschaft

Phenolchemie Gmbh & Co. Kg

Ineos Phenol & Gmbh Co., Kg

Degussa Aktiengesellschaft

Uwe Tanger

Hermann-Josef Korte

Markus Weber

Manfred Weber

Reinhard Sigg

Christoph Schwarz

Jochen Ullrich

Hartwig Rauleder

Mark Duda

Hans-Gerd Lueken

Wilhelm Droste

Franz-Michael Bollenrath

Stefan Schmidt

Stefan Bade

Dietmar Gubisch

Adolf Kuhnle

Otto Schnurr

Uwe Schoen

Michael Sakuth

Gerda Grund

Roger Arthur Sheldon

Isabella W C E Arends

Siegmund Greschek

Juergen Gruetzke

Sasidharan Manickam

Hugo Hjm Liefooghe

John Burkhard

Norbert Hofmann

Gernard Ludwig

Disclosed is a method for the preparation of cumene by reacting isopropanol or a mixture of isopropanol and propene with benzene in the presence of a &#x3b2;-zeolite catalyst having a SiO/AlOmolar ratio greater than 10:1 that can be integrated in a process for preparing phenol, which comprises preparing cumene as described above, oxidizing cumene to cumene hydroperoxide, acid-catalyzed cleavage of cumene hydroperoxide to give phenol and acetone, and hydrogenating acetone to form isopropanol.

Process for preparing cumene which is used in the preparation of phenol

Method for producing aromatic alcohols, especially phenol

Process and apparatus for the work-up by distillation of cleavage product mixtures produced in the cleavage of alkylaryl hydroperoxides

Process for preparing phenols

Phenol is separated from a mixture containing hydroxyacetone, cumene, water and phenol, by fractionating the mixture in a process with a fractional distillation step and a phase separation step to provide a single phenol fraction containing less than 300 ppm of hydroxyacetone. In the work-up by distillation of cleavage product mixtures, the hydroxyacetone can be removed from the cleavage product mixture together with a phenol fraction from which the hydroxyacetone has to be removed. A process can be used for purifying cleavage product mixtures obtained in the cleavage of alkylaryl hydroperoxides such as cumene hydroperoxide. The process allows separation of phenol and acetone from mixtures obtained in the cleavage of cumene hydroperoxide.

Process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol

The cleavage product from the acid-catalyzed cleavage of cumene hydroperoxide into phenol and acetone is subjected to thermal after-treatment by a process, which comprises heating the cleavage product in a reactor, wherein the heat supplied for the thermal treatment is the heat generated by at least one exothermic reaction which occurs in the reactor. The exothermic reaction which proceeds in the cleavage product is preferably the cleavage of cumene hydroperoxide.

Process for the thermal after-treatment of cleavage product from the acid-catalyzed cleavage of cumene hydroperoxide

A process for the cleavage of alkylaryl hydroperoxides includes steps for producing a mixture of a concentrate that contains at least one alkylaryl hydroperoxide to be cleaved and a cleavage product obtained from the cleavage of an alkylaryl hydroperoxide, dividing this mixture into at least two parts and cleaving the alkylaryl hydroperoxides in parallel at different temperatures. One of the two parts is treated at a temperature sufficiently high for an integrated thermal post-treatment to be achieved. The process consumes less energy since less steam has to be used. Problems which can result from fouling in heat exchangers are largely prevented. No second feed point for alkylaryl hydroperoxide has to be provided. The process can be used in the preparation of phenol and acetone by the Hock method.

Process for the cleavage of alkylaryl hydroperoxides

Process for the continuous preparation of 3-halopropylorganosilanes

The invention relates to a process for bleaching aqueous alkyl polyglycoside solutions using hydrogen peroxide, in a first step the actual bleaching being carried out at alkaline pHs in the presence of an inorganic additive (hydrogen peroxide decomposition inhibitor) and in a second step a specific decomposition of the unreacted hydrogen peroxide being performed by contact with transition metals or inorganic compounds thereof.

Process for bleaching aqueous surfactant solutions

A process for preparing 2-ethylhexanol by the liquid-phase catalytic hydrogenation of 2-ethylhexenal and a catalyst for preforming this catalytic hydrogenation are disclosed.

Process for the preparation of 2-ethylhexanol by liquid-phase catalytic

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Bochum, Germany

Uwe Tanger