Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1993-07-14
1995-04-04
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 2, 209 3, 209 11, 209167, 241 19, 241 20, 241 24, 131 96, 131345, 131331, B03B 106, B03B 104, B03D 102, B03D 104
Patent
active
054028930
ABSTRACT:
A method is described for processing waste materials in the form of filter rods, filter cigarettes and the like comprising filter material with inner hollow volumes accessible from the outside and at least one other material component, in particular paper and tobacco, wherein the following process steps are carried out: the waste material is distributed in a liquid in a pressure vessel. By increasing the pressure or decreasing the temperature an inert gas is dissolved in the liquid. Subsequently the temperature is increased or the pressure decreased so that fine gas bubbles develop within the filter material which permits the latter to float whereby a separation from the further material components to be separated is possible. With this method a separation of the waste material into its individual component parts is possible so that for example valuable filter material in the form of cellulose acetate is obtained in highly pure form and can be used again for the production of filter materials.
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Lithgow Thomas M.
Rhone-Poulenc Rhodia Aktiengesellschaft
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