Waagner-biro Aktiengesellschaft

Chemiefaser Lenzing Aktiengesellschaft

Austrian Energy & Environment Sgp/waagner Biro Gmbh

Austrian Energy & Environment Sgp/wagner-biro Gmbh

Steyrermuhl Papierfabriks-und-verlags-aktiengesellschaft

Waagner-biro Aktiengessellschaft

Heinz Loquenz

Wolfgang Glaser

Siegfried Meissl

Peter Yaldez

Anton Hruschka

Walter Staufer

Erich Feldbaumer

Alfred Sandri

Bernhard Blocher

Helmut Schweiger

Norbert Meindl

Josef Bammer

Karl Schwarzl

Kurt Tamandl

Method for the disposal of excess sludge

Drying and separating process and plant

A multi-stage, especially a two-stage mixing of two media of different viscosity, and a respective mixing nozzle provided therefor. The first medium of higher viscosity is divided into two or more partial streams. The first partial stream is passed through an injector, in which the second medium of lower viscosity is mixed in, in particular tangentially. In an adjoining mixing chamber, the second partial stream of the first medium is admixed into the flowing mixture of the first partial stream and the second medium of lower viscosity and envelops the same, preferably in an opposite or counter-twist to the flowing twist of the first mixture of the first partial stream and second medium. This is especially suitable for bleaching of cellulose with oxygen.

Method and nozzle for mixing mediums of different viscosity

Method and apparatus for delignifying chemical pulp by means of oxygen, in which an aqueous slurry of chemical pulp is formed, then mixed with a caustic agent, followed by contact with a delignifying fluid. Water is drained off the slurry without reduction of pressure and while maintaining temperature following which the resulting slurry is maintained under these temperature and pressure conditions for a discrete period of time. The thus-obtained treated slurry is then washed.

Method for delignification of cellulose with oxygen

Methods and apparatus pertaining to reduction of sodium sulfate to sodium sulfide include the feeding of sodium sulfate into a combustion chamber in which the sodium sulfate is exposed to a reducing atmosphere while at the same time being exposed also to a temperature above the melting point of sodium sulfide. Thus, a liquid accumulates at the bottom of the combustion chamber and this liquid will of course contain a considerable amount of sodium sulfide reduced from the sodium sulfate. The exhaust gases of the combustion chamber are utilized in a steam generator the exhaust gases of which may in turn be returned to the combustion chamber where these exhaust gases from the steam generator serve as an inert gas which is directed through the collected liquid to increase the turbulence thereof while at the same time additional reducing agents may be introduced into the liquid, in some cases with additional sodium sulfate, for improving the purity of the collected liquid as well as for decreasing the amount of non-reduced sodium sulfate in the liquid. Secondary air is supplied to the steam generator for burning therein the exhaust gases from the combustion chamber.

Reduction of sodium sulfate to sodium sulfide

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Graz, Austria

Heinz Loquenz