Ciba-geigy Ag

Ciba-geigy Corporation

Rudolf Buttiker

Franz Marti

Marianne Punzar

Paul Tobler

Robert Mercier

Hans Horisberger

Joachim Voigt

Rolf Strub

Ricardo Schneeberger

An apparatus for producing seed crystals in melts has a vertically oriented, closed vessel having a vessel base and having at least one inlet for the melt and having at least one outlet opening for the inoculated melt provided with seed crystals. A preferably annular region of the vessel wall is constructed as a cooling surface. In the interior of the vessel there is arranged a scraping unit which comprises a motor-driven rotating shaft which extends axially through the vessel as far as a point just short of the vessel base. At its end towards the vessel base, the shaft is provided with at least one scraping arm which, starting from the lower end of the shaft close to the vessel base, extends first in the direction towards the vessel wall and thence substantially parallel to the annular cooling surface and axially parallel to the drive shaft. On the scraping arm there are preferably arranged one or more scraping blades which during operation sweep along the inner wall of the vessel in the region of the cooling surface. The scraping unit is heatable. The production of granules, especially of high molecular weight, for example &gt;300, is carried out in a crystallization plant which comprises a supply container for the melt, an apparatus of the afore-described type for producing seed crystals in the melt, and a prill tower in which the inoculated melt provided with seed crystals is sprayed or introduced dropwise into a cooled current of gas. The drops crystallize during their free-fall descent. The granules so produced are discharged at the base of the tower.

Apparatus for producing seed crystals

The apparatus (1) for wet oxidation is pre-assembled with its individual units, namely a high-pressure pump (2), a heat exchanger (3), a reactor (4) for the actual wet oxidation and a compressor (5) for feeding an oxygen/gas mixture, in one or two supporting flames and is accommodated in such a manner that its dimensions and its overall weight allow it to be transported on a road and/or rail vehicle, there advantageously being provided two such supporting flames in the form of standard containers (8 and 9), of which one may contain the reactor (4), divided into individual tube sections (6), and the heat exchanger (3), and the other may contain the remaining units, so that the entire apparatus can be pre-assembled into virtually operational condition and the two containers simply have to be set up, joined together and connected on site. Wet oxidation can thus be carried out even where relatively small quantities of medium are to be purified.

Apparatus for wet oxidation

A process and an apparatus used to produce a suspension of cyanuric chloride in water, or to react cyanuric chloride with ammonia or with amines. It is possible to produce cyanuric chloride suspensions in water which have a mean particle size of below 20 .mu.m, and a concentration of higher than 20% by weight of cyanuric chloride.

Apparatus for producing a suspension of cyanuric chloride in water, or

The process and the apparatus according to the invention are used to produce a suspension of cyanuric chloride in water, or to react cyanuric chloride with ammonia or with amines. It is possible to produce cyanuric chloride suspensions in water which have a mean particle size of below 20 .mu.m, and a concentration of higher than 20% by weight of cyanuric chloride.

Process for reacting cyanuric chloride with ammonia or with amines

Process for producing a suspension of cyanuric chloride in water

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Riehen, Switzerland

Rudolf Buttiker