Method for decolorizing textile materials
First Claim
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1. A method for decolorizing a dye-colored synthetic polymer, comprising:
- treating a dye-colored synthetic polymer with a treatment composition, the treatment composition comprising(a) sodium formaldehyde sulfoxylate,(b) water, and(c) a ketone dissolved in the treatment composition;
wherein the treatment composition has a pH of 6 or less, and the treating is carried out at a temperature of at least 50°
C. and for a duration of time sufficient to at least partially decolorize the synthetic polymer; and
following the treating, separating at least partially decolorized synthetic polymer from the treatment composition.
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Abstract
The disclosure relates to a method for decolorization of a dye-colored synthetic polymer, which includes the steps of treating a dye-colored synthetic polymer, such as polyester, with a treatment composition at pH 6 or less, the treatment composition comprising sodium formaldehyde sulfoxylate, water, and a ketone. The resulting decolorized synthetic polymer is then separated from the treatment composition.
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20 Claims
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1. A method for decolorizing a dye-colored synthetic polymer, comprising:
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treating a dye-colored synthetic polymer with a treatment composition, the treatment composition comprising (a) sodium formaldehyde sulfoxylate, (b) water, and (c) a ketone dissolved in the treatment composition; wherein the treatment composition has a pH of 6 or less, and the treating is carried out at a temperature of at least 50°
C. and for a duration of time sufficient to at least partially decolorize the synthetic polymer; andfollowing the treating, separating at least partially decolorized synthetic polymer from the treatment composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification