Cake filtration of multi-component-suspensions

S. K├╝hne*, U.A. Peuker, Technical University Bergakademie Freiberg, Germany

Multi-component suspensions contain, apart from a disperse solid phase, a second disperse but liquid phase, e.g. a mother liquor in which both droplets and particles are suspended. These complex suspensions occur wherever a mixture of the three phases is exposed to mechanical stress, emulsions and suspensions are mixed or solid particles are generated inside an emulsion. Examples are processing of pickering emulsions or oil sand and special emulsion processes such as emulsion polymerisation or the precipitation of micron particles inside of emulsion droplets.

Cake filtration of multi-component-suspensions is influenced by several effects. Depending on the wettability of the solid particles through the different liquid media agglomeration and flocculation occurs, which effects the cake formation and the structure of the pore system. Also, the two-phase flow of the different media through the pore system has an influence on the composition of the filtrate.

In order to determine the separation properties of such systems a model system consisting of water as a continuous phase, in which isooctane and glass beads are dispersed, is investigated. Nutsch filter experiments (VDI 2762) are conducted to determine process characteristics such as cake resistance and hold up. Through varying of the volume of isooctane in the suspension the capability of the cake to retain the oil inside its structure and how this effects cake resistance and porosity is investigated....

Session: L3 - Cake Filtration II - Washing and Multicomponent Separation
Day: 11 October 2016
Time: 14:45 - 16:00 h