Decolorization method for dyed fiber cloth

Abstract

A decolorization method for a dyed fiber cloth is provided. The decolorization method for the dyed fiber cloth includes steps of: providing a fiber cloth attached with a dye, extracting the dye attached on the fiber cloth by an extractant, and applying a microwave to evaporate the extractant so as to obtain a dried and decolored fiber cloth.

What is claimed is: 
     
         1 . A decolorization method for a dyed fiber cloth, comprising:
 providing a fiber cloth attached with a dye;   extracting the dye attached on the fiber cloth by an extractant; and   applying a microwave to evaporate the extractant so as to obtain a dried and decolored fiber cloth.   
     
     
         2 . The decolorization method according to  claim 1 , wherein the fiber cloth is extracted at a temperature ranging from 70° C. to 130° C. 
     
     
         3 . The decolorization method according to  claim 1 , further comprising separating a part of the extractant by filtration before applying the microwave. 
     
     
         4 . The decolorization method according to  claim 3 , wherein, after the filtration, based on a total weight of the fiber cloth and the extractant remained on the fiber cloth being 100 wt %, a residue of the extractant remaining on the fiber cloth ranges from 5 wt % to 70 wt %. 
     
     
         5 . The decolorization method according to  claim 1 , wherein, after applying the microwave, based on a total weight of the fiber cloth and the extractant remained on the fiber cloth being 100 wt %, a residue of the extractant remaining on the fiber cloth ranges from 0 wt % to 5 wt %. 
     
     
         6 . The decolorization method according to  claim 1 , further comprising condensing and collecting the extractant after applying the microwave, and a recovery rate of the extractant being higher than or equal to 90%. 
     
     
         7 . The decolorization method according to  claim 1 , wherein a weight ratio of the extractant to the fiber cloth ranges from 10 to 30. 
     
     
         8 . The decolorization method according to  claim 1 , wherein, when applying the microwave, a direction of heat transfer of the extractant and a direction of mass transfer of the extractant are a same direction. 
     
     
         9 . The decolorization method according to  claim 1 , wherein, after applying the microwave, a temperature of the fiber cloth is higher than a boiling point of the extractant. 
     
     
         10 . The decolorization method according to  claim 1 , wherein the dye attached on the fiber cloth is extracted from one to six times by the extractant.