Disposal method for waste fabric containing polyester, nylon, and dye

A disposal method for waste fabric containing polyester, nylon, and dye, comprising:

• step (a):
• providing a waste fabric containing polyester, nylon, and dye;
• step (b):
• performing a first-stage treatment on the waste fabric to obtain a first liquid material and a first solid material;
• step (c):
• performing a second-stage treatment on the first liquid material to obtain a second liquid material and a second solid material;
• step (d):
• performing a third-stage treatment on the first solid material to at least obtain a third liquid material and a third solid material;
• and
• step (e):
• performing a fourth-stage treatment on the third solid material to obtain a fourth liquid material and a fourth solid material,
• wherein the first-stage treatment comprises acid treatment with an acid liquid mixed with an oxidant, so as to decompose or decolorize the dye and to dissolve the nylon in the first stage treatment;
• wherein the second-stage treatment comprises a dilution process;
• wherein an acid concentration of the second liquid material is lower than an acid concentration of the first liquid material;
• wherein the first solid material comprises recycled polyester;
• wherein the first liquid material comprises recycled nylon or degraded nylon;
• wherein a concentration of the oxidant used in the acid treatment of the first-stage treatment is 0.5 wt % to 10 wt %;
• wherein the acid treatment in the first-stage treatment further comprises heating to 80° C. to 150° C.;
• wherein based on a total amount of the nylon in the waste fabric, an amount of the nylon in the first liquid material is 75 wt % to 90 wt %, and an amount of the nylon in the first solid material is 25 wt % to 10 wt %;
• wherein the third-stage treatment comprises an acid treatment;
• wherein the fourth-stage treatment comprises a dilution treatment;
• wherein an acid concentration of the fourth liquid material is lower than an acid concentration of the third liquid material;
• wherein the third solid material comprises recycled polyester, or the fourth solid material comprises recycled nylon;
• wherein the step (a), the step (b), the step (d) and the step (e) are performed N times, where N is greater than or equal to 2;
• wherein the step (c) is performed M times, where M is less than or equal to N;
• and
• wherein the acid treatment of the N-th third-stage treatment comprises performing an acid treatment with the M-th second liquid material;
• or
• wherein the acid treatment of the N-th third-stage treatment comprises performing an acid treatment with the P-th fourth liquid, wherein P is smaller than N.