BE445567A

BE445567A -

Info

Publication number: BE445567A
Authority: BE
Priority date: 1941-05-15
Also published as: CH228895A; FR881863A

Description

       

  Procédé d'aération des bains de précipitation dans les fabrications de viscose.

  
Dans les fabriques de soie artificielles, de jute de cellulose, de feuilles plastiques cellulosiques, de laine

  
 <EMI ID=1.1> 

  
se, le bain de précipitation, lors du pressage de la viscose est continuellement étendu d'eau et en même temps enrichi

  
en substances de valeur, mais insalubres comme l'hydrogène sulfuré et le sulfure de carbone. En conséquence le problème se pose de débarrasser le bain de l'eau en excès et de récupérer les substances de valeur qui y ont été introduites. 

  
 <EMI ID=2.1> 

  
temps à autre dans la cuve de travail une partie du liquide du bain, en le régénérant et en le réintroduisant ensuite dans la cuve. La régénération s'effectue en séparant l'eau

  
 <EMI ID=3.1> 

  
cupérer le sulfure de carbone par vaporisation dans le vide suivie de condensation. Ce procédé se heurte à des difficultés de tous genres qui entraînent des installations compliquées. En outre et surtout il a l'inconvénient d'avoir besoin d'un excès de bain de précipitation en vue de compenser les pré-

  
 <EMI ID=4.1> 

  
et par suite d'obliger à tenir compte de variations continuelles dans la concentration du bain de travail.

  
Le procédé de l'invention réunit l'ensemble des opérations de régénération en un unique processus continu, il simplifie les moyens à mettre en oeuvre, économise une grande partie du liquide du bain de précipitation jusqu'ici

  
 <EMI ID=5.1> 

  
sous vide, à introduire dans le bain, par en bas, de l'air ou un autre gaz iherte, à le réaspirer par en haut, à le diriger dans des appareils d'absorption et de séchage, puis à le réintroduire dans le bain, en le faisant ainsi circuler en circuit fermé.

  
Ce procédé est mis en oeuvre de la façon suivante :
l'air ou le gaz inerte est introduit dans le bain à l'état chaud, il y est insufflé, par exemple à travers un filtre céramique, de façon à obtenir un courant gazeux finement divisé. Pour assurer une répartition uniforme du gaz dans le



  Aeration process for precipitation baths in viscose manufacturing.

  
In the factories of artificial silk, cellulose jute, cellulose plastic sheets, wool

  
 <EMI ID = 1.1>

  
se, the precipitation bath, when pressing the viscose is continuously diluted with water and at the same time enriched

  
valuable but unsanitary substances like hydrogen sulfide and carbon disulphide. Consequently the problem arises of ridding the bath of excess water and of recovering the valuable substances which have been introduced therein.

  
 <EMI ID = 2.1>

  
from time to time in the working tank a part of the liquid of the bath, regenerating it and then reintroducing it into the tank. Regeneration is carried out by separating the water

  
 <EMI ID = 3.1>

  
cuper the carbon disulphide by vaporization in a vacuum followed by condensation. This process comes up against all kinds of difficulties which lead to complicated installations. In addition and above all, it has the drawback of needing an excess of precipitation bath in order to compensate for the pre-

  
 <EMI ID = 4.1>

  
and consequently to oblige to take account of continual variations in the concentration of the working bath.

  
The method of the invention combines all the regeneration operations into a single continuous process, it simplifies the means to be implemented, saves a large part of the liquid in the precipitation bath so far.

  
 <EMI ID = 5.1>

  
vacuum, to introduce into the bath, from below, air or another iherte gas, to suck it again from above, to direct it into absorption and drying devices, then to reintroduce it into the bath , thus making it circulate in a closed circuit.

  
This process is implemented as follows:
the air or the inert gas is introduced into the bath in the hot state, it is blown therein, for example through a ceramic filter, so as to obtain a finely divided gas stream. To ensure even distribution of gas in the

Claims

bath, a device, for example a tube open on both sides, which causes circulation in the liquid of the bath, is mounted above the gas stream divider. Due to the fine division of the gas stream, a very <EMI ID = 6.1> occurs.

that is to say water and in particular liquid sulfur compounds.

To reinforce this action, a vacuum is created in the space located above the bath. After the gas has passed through the bath liquid, it is sucked in and directed into devices

condensation and absorption or adsorption, then reintroduced into the bath. As condensing devices, refrigerants can be used, for example; scrubbers can be used as absorption or adsorption devices

regenerable gas or activated carbon filters. In

these devices the gas gives up the water, carbon disulphide and the hydrocarbon that it contains, then completely free of these bodies it enters the bath again in finely divided form.

CLAIMS.

distillation of the precipitation bath and recovery of liquid sulfur compounds such as carbon disulphide and hydrogen sulfide by injection of air or another inert gas

the very tank which contains the bath is placed under vacuum, that the aeration gas, after passing through the bath, is sucked and then directed into absorption and adsorption devices as well as into drying devices and is then reintroduced in the closed circuit bath. 2 [deg.] A method according to claim 1 characterized in that a circulation movement is maintained in the bath by means of a stirring device associated with the aeration gas divider, for example a tube open on both sides by means of which the gas stream is diverted. <EMI ID = 9.1> <EMI ID = 10.1>