Process for the removal of foreign materials from a...

Details Process for the removal of foreign materials from a... Process for the removal of foreign materials from a...

C - Chemistry, Metallurgy

08

J

C08J 11/10 (2006.01) B01J 19/24 (2006.01) B03B 5/28 (2006.01) B29B 13/02 (2006.01) B29B 17/02 (2006.01) C08G 63/90 (2006.01) C08J 11/06 (2006.01) C08J 11/24 (2006.01)

Patent

CA 2133214

This invention relates to a process for removing foreign materials from a post- consumer polyethylene terephthalate feed stream which comprises: (1) depolymerizing the polyethylene terephthalate feed stream into a melt having a melt viscosity which is within the range of 0.001 poise to 1000 poise (2) feeding the melt into a separation device, (3) allowing low density foreign ma- terials to float to the surface of the melt, (4) allowing high density foreign materials to sink to the bottom of the melt, and (5) rem- oving molten polyethylene terephthalate oligomer from an area which is located intermediately between the surface of the melt and the bottom of the melt.

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