Kerosene black dispersions

Sedimentation Volumes of Carbon Black Dispersions in Kerosene (14)... 

Figure 16. Electron micrographs showing floe structure of carbon black dispersed in odorless kerosene after 150 hours of agitation. Parts OLOA-1200 per 100 parts of carbon black (a)-0, (b)-0.A, (c)-2.0, (d)-A.O. These are from samples (a), (c), (i) and (k) of Figure 15. Reproduced with permission from Ref. (1A). Copyright 1983, Elsevier Science Publishers.

Foam films and a foam from the aqueous and organic phases of an extraction system containing a 30% solution of tri-buthyl phosphate (TBP) in kerosene and nitric acid (1 mol dm 3) have been studied in a parallel mode [137]. The reasons for foaming and the effect of emulsion formation on foam stability were elucidated. Thus, a foam with a measurable lifetime was obtained when TBP was in concentration of 0.8 mol dm 3 which corresponded to the concentration of black spot formation. When the volume ratio of the organic to the aqueous phase was 1 5, the foam formed in the system was stabilised additionally by a highly disperse O/W emulsion. This was due to the reduced rate of drainage. These results are confirmed by the experimental data acquired with a specially constructed centrifugal extractor [136]. It makes it possible to perform an extraction process under conditions close to those in industry. 

The trapping of absorbing particles was performed using irregular black ceramic particles and CuO particles dispersed in kerosene. We have also trapped slightly absorbing latex spheres which were in clumps so that their rotation could be more easily observed. 

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