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Bayer Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Phenolchemie Gmbh & Co. Kg

Werner Kleinloh

Claus H Wulff

Gottfried Zaby

Tony Van Osselaer

Andrei K Griaznov

Otto Schnurr

Otto Gerlich

Irina I Vasilieva

Michael Kleine-Boymann

Vladimir M Zakoshansky

Christian Michalik

Heinrich Van Barnefeld

Werner Thronberens

Youry Nikolaevitch Youriev

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

The transportation and storage of phenol is enhanced by additions of up to 70% by weight of acetone to liquid phenol.

Method for the transport and storage of phenol

The process relates to the formation of diaphragms, for example those used for alkali chloride electrolysis in an aqueous solution. The formation of a layer-type diaphragm, accreted on a hollow diaphragm support from a slurry having a high solids content of diaphragm material, is made uniform. During the accretion step, the diaphragm support is periodically lifted and lowered in the slurry (frequency 0.1-10 min.sup.-1 ; amplitude 10-100 cm; velocity 2-20 cm/sec); its topside, at the upper reversal point of the oscillating motion, has a certain spacing (10-25 cm) from the constantly measured height of the level of slurry in the accretion tank and its underside cannot reach below a minimum distance (30 cm) from the bottom of the basin. The suction pressure of the slurry through the hollow diaphragm support is maintained at a constant value and is controlled (10-500 mbar below the atmospheric pressure of the surroundings). The accretion step can be subdivided into time intervals between which the frequency and the suction pressure are increased stepwise. The electrolysis process becomes more economical with the use of the diaphragm produced according to this invention.

Process for the production of a diaphragm for electrolytic cells

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Haltern, Germany

Werner Kleinloh