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

1975-05-19

1977-01-18

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

264 37, 264 49, 264344, C08G 6370, D06M 900

Patent

active

040038807

ABSTRACT:
Polyester polymer is recovered from mixed collections of fibers in the form of fibers, filaments, 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, films and other polymer products through the process of stripping the dye from the polyester fibers by contacting the fabrics with a dye stripping solvent for polyester polymer which is preferably not a solvent for fibers other than polyester fibers at a temperature below which the polyester fibers dissolve and above which the crystalline lattice of the polyester fibers swell so as to release the dye; then removing essentially all of the dye-containing dye-stripping solvent which is not absorbed by the fibers; then contacting the solvent-laden fibers (which may contain residual dye) with sufficient additional solvent under selective dissolution conditions for polyester fibers; then removing the undissolved fibers and any other undissolved impurities from the solution; thereafter precipitating the polyester out of; and, separating the polyester from the solution.

REFERENCES:
patent: 2337928 (1943-12-01), Reichel
patent: 2938811 (1960-05-01), Hermes
patent: 3132194 (1964-05-01), Edmonds et al.
patent: 3159964 (1964-12-01), Kretsch
patent: 3716614 (1973-02-01), Okamoto et al.
patent: 3758457 (1973-09-01), Broeck et al.
patent: 3943105 (1976-03-01), Hermes

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