Process and plant for removing dyes from waste textiles
AssigneeSanko Tekstil Isletmeleri San. Ve Tic. A.S.
InventorsAgamirze HAMITBEYLI, Kenan LOYAN, Sabrettin AKBULUT, Hikmet Nil BAYRAK, Nuriye ZENGIN, Sevtap AYDIN
Life of this patent
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Abstract
In a process for recycling waste fabric comprising dyed polyester fibers or dyed cellulosic fibers, a polar solvent is flowed through the waste fabric in an extraction chamber to remove the dyes; the solvent is evaporated in an evaporation chamber and condensed to be sent to a solvent collection tank or back to the extraction chamber; any elastomeric material present in the waste textile is dissolved by the solvent during the treatment.
Claims22
A process for removing dyes from waste textile (2), said waste textile containing or consisting of dyed polyester fibers comprising disperse dyes for said polyester fibers (1), or said waste textile comprising or consisting of dyed cotton fibers comprising indigo or indigoid dyes, said process comprising the following steps:
- a) providing an amount of said waste textile (2) in an extraction chamber (4) and heating said extraction chamber (4),
- b) circulating through said extraction chamber (4) and said waste textile (2) a solvent (3) suitable to remove said dyes from said waste textile (2);
- c) feeding the solvent exiting said extraction chamber (4) back to the extraction chamber (4) to increase the amount of dyes removed from said waste textile (2);
- d) evaporating at least part of the solvent (3) obtained in said step c) in an evaporation chamber (6);
- and,
- e) condensing the evaporated solvent (3) in at least one condensation chamber (7).
A plant for removing dyes from a waste fabric, comprising:
- an extraction chamber (4) configured to contain a waste textile (2), said extraction chamber (4) comprising at least a heater (8);
- a container for storing a solvent (3) suitable to remove said dyes from said waste textile;
- circulation means (9) for circulating said solvent at least once through said waste textile and said extraction chamber (4) to produce said solvent containing said dyes;
- an evaporation chamber (6) configured to collect the solvent containing dyes and to evaporate at least part of said solvent (3) containing said dyes;
- at least one condensation chamber (7) comprising a cooling system (10) configured to condensate said solvent evaporated in said evaporation chamber (6);
- and
- storage means for storing said condensed solvent.
Dependencies are inferred from the claim text.