METHODS AND SYSTEMS FOR DYE REMOVAL FROM POLYMER TEXTILES
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.
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.