Methods and systems for dye removal from polymer textiles

Abstract

The present disclosure relates to a method that includes a first contacting of a starting solid composition that includes a starting solid phase and a dye with a removal fluid resulting in a first mixture that includes the starting solid phase, the dye, and the removal fluid, where the removal fluid includes at least one of a cyclic compound, a glycol, an alcohol, and/or an acid.

What is claimed is: 
     
         1 . A method comprising:
 a first contacting of a starting solid composition comprising a starting solid phase and a dye with a removal fluid resulting in a first mixture comprising the starting solid phase, the dye, and the removal fluid, wherein the removal fluid comprises at least one of a cyclic compound, a glycol, an alcohol, or an acid.   
     
     
         2 . The method of  claim 1 , wherein the removal fluid is biobased. 
     
     
         3 . The method of  claim 1 , further comprising a first treating of the first mixture resulting in a recovered solid phase comprising the starting solid phase and an effluent comprising the dye. 
     
     
         4 . The method of  claim 3 , further comprising a second treating of the effluent resulting in the separating and recovery of the dye and the removal fluid. 
     
     
         5 . The method of  claim 4 , further comprising a second contacting of the recovered solid phase with an alcohol, resulting in a second recovered solid phase that has a concentration of the dye that is lower than a concentration of the dye for the recovered solid phase. 
     
     
         6 . The method of  claim 1 , wherein the acid comprises at least one of acetic acid, levulinic acid, or n-valeric acid. 
     
     
         7 . The method of  claim 1 , wherein the glycol comprises at least one of ethylene glycol or polyethylene glycol, propylene glycol, or polypropylene glycol. 
     
     
         8 . The method of  claim 1 , wherein the cyclic compound comprises at least one of guaiacol, a guaiacol derivative, a phenol compound, cyrene, 7-valerolactone, ε-caprolactone, benzyl alcohol, or limonene. 
     
     
         9 . The method of  claim 8 , wherein the guaiacol derivative comprises at least one of 4-ethylguaiacol, 4-propylguaiacol, eugenol, or isoeugenol. 
     
     
         10 . The method of  claim 8 , wherein the phenol compound comprises at least one of phenol, 4-propyl phenol, thymol, 4-isopropylphenol, or 2-isopropylphenol. 
     
     
         11 . The method of  claim 1 , wherein the alcohol comprises at least one of ethanol, isopropyl alcohol, n-butanol, 4-methyl-2-pentanol, or methanol. 
     
     
         12 . The method of  claim 1 , wherein the starting solid phase comprises at least one of a synthetic material or a naturally occurring material. 
     
     
         13 . The method of  claim 12 , wherein the synthetic material comprises at least one of a polymer, a resin, or an oligomer. 
     
     
         14 . The method of  claim 13 , wherein the polymer comprises at least one of polyester, polyamide, polyurethane, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polytetrafluoroethylene, polychlorotrifluoroethylene, polyethylene terephthalate, polychloroprene, polyacrylonitrile, polytetrafluoroethylene, polyimide, or polybutylene adipate terephthalate. 
     
     
         15 . The method of  claim 1 , wherein the starting solid phase is in a form comprising at least one of a fabric, fiber, pellet, powder, flake, granule, or film. 
     
     
         16 . The method of  claim 15 , wherein the starting fiber has a diameter between 1.0 D and 2.2 D (Denier), or between 1.2 D and 2.0 D (Denier). 
     
     
         17 . The method of  claim 1 , wherein the dye comprises at least one of a colorant, a pigment, a dyestuff, a stain, or a tincture. 
     
     
         18 . The method of  claim 1 , wherein the dye comprises at least one of a natural dye or a synthetic dye. 
     
     
         19 . The method of  claim 18 , wherein the natural or synthetic dye is ionic.