Fabric dye stripping, separation and recovery of polyester

Details Fabric dye stripping, separation and recovery of polyester Fabric dye stripping, separation and recovery of polyester

C - Chemistry, Metallurgy

08

J

403/8

C08J 11/04 (2006.01) C08J 11/08 (2006.01) D01F 13/04 (2006.01)

Patent

CA 1090046

FABRIC DYE STRIPPING, SEPARATION AND RECOVERY OF POLYESTER ABSTRACT OF THE DISCLOSURE Polyester polymer is recovered from mixed collections of fibers in the form of fibers, filaments, yarns, or fabrics (including dyed or undyed fibers other than polyester fibers as well as dyed polyester fibers) and used in the production of new undyed fibers, by solvent stripping the dye from the polyester fibers without dissolving the fibers, and with additional solvent, selectively dissolving the polyester fibers in successive but functionally integrated steps; separating the dissolved fibers from any undissolved impurities and thereafter separating the residual dye- stripping solvent and the additional solvent from the polyester component without precipitating the polyester component from solution by evaporating the solvent, preferably by atmospheric boiling and vacuum finishing of the molten solution.

292661

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