Peroxid-chemie Gmbh

Dipl.-ing. Hanns Frohler

Erwin Rossberger

Josef Weinmaier

Michael Gnann

Nikolaus Ailler

Maximilian Dorn

Eberhard Hagel

Wolfgang Jahr

Herbert Appl

Hanns Frohler

The present invention provides an electrolysis cell of the filter press type for the production of peroxy and perhalogenate compounds comprising alternatingly arranged cathodes and anodes provided with electrolyte feeds, wherein the cathodes (1) and anodes (2) consist of right parallelpiped-shaped hollow bodies between which are present frame-shaped seals (3) and which, via these seals (3), are connected together in a liquid-tight manner and insulated from one another to give a cell pile, the cathode hollow bodies (1) are liquid- and gas-permeable, the anode hollow bodies (2) possess, above and below a platinum layer, openings for the introduction and removal of the anolyte and the effective anode surface is formed by the platinum metal layer of a composite anode comprising a valve metal substrate and a platinum layer present thereon which is obtainable by the hot isostatic pressing of a platinum foil on to a valve metal carrier.

Filter press electrolysis cell

A composite electrode based on a valve metal with a layer of a platinum foil securely adhering thereto is produced by hot isostatic pressing of the valve metal base and platinum foil between separating sheets; the separating sheet which comes in contact with the platinum foil during hot isostatic pressing is a metal with a melting point of at least 100.degree. C. above the hot isostatic pressing temperature.

Valve metal/platinum composite electrode

Process for a worm extruder or continuous kneader to produce either a degasses paste or plastic composition is disclosed. A mixture of either solid or liquid organic peroxides in the paste or plastic composition having evaporable constituents are introduced into the device, homogenized and degassed by exposing the mixture to a degassing passage of the extruder. The mixture has a free surface which is more than 40% of the cross-section of the degassing passage and the minimum gas passage cross-section of the return delivery device amounts to at least about 0.1 times the degassing passage cross-section.

Degassing process for a worm extruder

The present invention provides a process for cross-linking organopolysiloxanes by means of a bis-benzoyl peroxide derivative with heating, wherein, as bis-benzoyl peroxide derivative, there is used at least one compound of the general formula: ##STR1## in which the symbols R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5, each independently of one another, have the following meanings: R.sup.1 and R.sup.5 are the same or different and signify alkoxycarbonyl radicals with 2 to 4 carbon atoms in the alkyl moiety or fluorine or hydrogen atoms, R.sup.2 and R.sup.4 are the same or different and signify alkyl radicals with 2 to 8 carbon atoms or hydrogen atoms and R.sup.3 signifies an alkyl radical with 1 to 8 carbon atoms or a hydrogen atom, at least 2 symbols and at most 4 symbols per benzene ring signifying hydrogen atoms. The present invention also provides an agent for carrying out this process which consists essentially of silicone oil in which is contained, in finely divided form, 10 to 80% by weight of at least one compound of general formula (I).

Process and agent for cross-linking organopolysiloxanes

A degassing device on a worm extruder having a worm housing accomodating the worm or worms and provided with at least one degassing passage opening into the worm chamber of the housing is provided with a return delivery device for material which has penetrated from the worm chamber into the degassing passage. The free surface (evaporation area) of the extruder material within the degassing passage amounts to more than about 40% of the degassing passage cross-section, and the smallest gas passage cross-section of the return delivery device amounts to at least about 0.1 times, the degassing passage cross-section. Especially in the case of pasty material this reliably prevents a blockage of the degassing passage by the material processed in the worm extruder.

Degassing device on a worm extruder

The present invention provides a process for the continuous production of chlorine dioxide by the reaction of hydrochloric acid with an alkali metal chlorate solution, which is obtained by means of an electrolysis plant from a chlorate solution containing alkali metal chloride circulating in the process, together with cathodically-formed hydrogen, in a cascade reactor with the introduction of air, wherein the reaction of the alkali metal chlorate solution with the hydrochloric acid is carried out under reduced pressure and chlorine gas separated off from the reaction product is reacted with the cathodically-formed hydrogen with the introduction of external chlorine gas to give the required amount of hydrochloric acid. The present invention also provides a device for carrying out this process, comprising at least one chlorate electrolysis plant, a cascade reactor, a separation column and a hydrochloric acid synthesis furnace, which are connected with one another by means of pipes according to the manner of operating the process, wherein a valve is provided in the air inlet pipe of the reactor, which valve is regulated corresponding to the pressure at the product outlet of the reactor.

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Grossdingharting, Germany

Erwin Rossberger