Phenolchemie Gmbh & Co. Kg

Other

Otto Gerlich

Michael Kleine-Boymann

Werner Pompetzki

Christian Michalik

Reinhard Sigg

Manfred Weber

Andrei K Griaznov

Otto Schnurr

Irina I Vasilieva

Vladimir M Zakoshansky

Werner Kleinloh

Heinrich Van Barneveld

Wilfried Jordan

J&uuml;rgen Volke

Youry Nikolaevitch Youriev

Hermann Schmidt

Juergen Volke

Dietmar Ahrens

Hugo H J M Liefooche

Heinrich Van Barnefeld

Process for removal of impurities from phenol by means of at least one acid catalyst

Phenol and acetone are prepared by a process comprising homogeneously cleaving cumene hydroperoxide in the presence of acid catalyst in a cleavage apparatus comprising at least one reactor having plug flow characteristics thereby producing a cleavage product; recycling some of the cleavage product stream by combining the recycled cleavage product stream with the cumene hydroperoxide-containing feed stream fed to said cleavage apparatus under the condition that the mass flow ratio of the recycled partial cleavage product stream to the cumene hydroperoxide-containing feed stream sent to the cleavage reactor is less than 10.

Process for preparing phenol and acetone by acid-catalyzed cleavage of cumene hydroperoxide

The present invention provides a method of starting up a loop reactor system, which method includes heating a reaction mixture present in the loop reactor system with the heat of reaction of at least one exothermic reaction occurring in the loop reactor system. The method of the invention makes possible an inexpensive, reliable and simple start-up of loop reactor systems, since the heat liberated when carrying out an exothermic reaction is utilized for heating the reaction mixture present in the loop reactor. Use of the method of the invention makes it unnecessary to switch heat exchangers over from coolant to heat transfer media such as steam. Since the method of the invention is able to heat up the reaction mixture in the loop reactor system more rapidly than in conventional methods, the number and the amount of by-products formed by secondary reactions during the start-up phase is reduced. In addition, the method of the invention reduces the corrosive stress on the heat exchangers since none of the heat exchangers need be at a temperature significantly higher than the temperature of the reaction mixture in the loop reactor system.

Method of starting up loop reactor systems in which at least one exothermic reaction is to be carried out

A process for reducing the loading of wastewaters produced in the preparation of hydroxyl and carbonyl compounds from hydroperoxides by the Hock process, which may be acidic, by treating the wastewaters with an oxygen-containing gas at a pressure greater than 25 bar absolute and at a temperature of 150-250&deg; C. Surprisingly, improved degradation rates are achieved under these conditions.

Process for cleaning up wastewaters from the hock process

The present invention relates to an improved method for producing phenol and acetone by oxidizing cumene into technical cumol hydroperoxide (CHP) through catalytic cleavage of the CHP. According to the invention, the oxidation products are concentrated to up to a cumene content ranging from 21 to 30 wt % in the technical cumol hydroperoxide, said mixture being used for the catalytic cleavage.

Process for the production of phenol and acetone from cumene

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Gladbeck, Germany

Otto Gerlich