DECOLORIZATION OF FABRICS USING PHOSPHORIC AND PHOSPHOROUS ACID DERIVATIVES

• US 20100281623A1
• Filed: 10/17/2008
• Published: 11/11/2010
• Est. Priority Date: 10/17/2007
• Status: Abandoned Application

• Current Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Original Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Inventors: Oshel, Reed E., Verkade, John G.
• Application Number:
  US12/738,578
• Publication Number:
  US 20100281623A1
• Time in Patent Office: Days
• US Class Current: 8/102
• CPC Class Codes: D06P 5/131 with acids or bases
• CPC Class Codes: D06P 5/137 with other compounds

Abstract

The present invention is directed to a method of removing colorants from a material. The method includes providing colored material, providing an oxoacid or oxoacid ester of phosphorous acid, and combining the colored material and the oxoacid or oxoacid ester of phosphorous under conditions effective to remove the colorant from the colored material.

Claims

1. A method of removing colorants from a material comprising:

providing colored material;

providing an oxoacid or oxoacid ester of phosphorous acid; and

combining the colored material and the oxoacid or oxoacid ester of phosphorous acid under conditions effective to remove the colorant from the colored material.

2. The method of claim 1 further comprising:

adding water to the combined colored material and the oxoacid or oxoacid ester of phosphorous acid under conditions effective to remove the colorant from the colored material.

3. The method of claim 1, wherein the colored material is a polymer.

4. The method of claim 3, wherein the polymer is a fiber.

5. The method of claim 4, therein the fiber is a textile fiber.

6. The method of claim 3, wherein the polymer is polyester.

7. The method of claim 1, wherein the oxoacid or oxoacid ester of phosphorous acid is in an aqueous solution.

8. The method of claim 1, wherein an oxoacid of phosphorous acid is provided.

9. The method of claim 8, wherein the oxoacid of phosphorous acid is selected from the group consisting of phosphorous acid, phosphoric acid, hypophosphorous acid, polyphosphoric acid, and mixtures thereof.

10. The method of claim 1, wherein an oxoacid ester of phosphorus acid is provided.

11. The method of claim 10, wherein the oxoacid ester of phosphorus acid is a triester of phosphorous acid.

12. The method of claim 11, wherein the triester of phosphorous acid is selected from the group consisting of acyclic P(OR)₃, where each R is independently H or a substituted or unsubstituted C₁-C₆ alkyl group, a substituted or unsubstituted alkene group, or a substituted or unsubstituted alkyne group;

13. The method of claim 1, wherein the colorant is completely removed from the colored material.

14. The method of claim 1, wherein the colorant is partially removed from the colored material.

15. The method of claim 1, wherein said combining is carried out at a temperature of 100-200°

C.

16. The method of claim 15, wherein said combining is carried out at a temperature of 125-175°

C.

17. The method of claim 1 further comprising:

removing the material from the solution after said combining and

washing or rinsing the material.

18. The method of claim 17, wherein said washing or rinsing comprises:

adding a solvent to the material.

19. The method of claim 18, wherein said solvent is water or an alcohol.

20. The method of claim 19, wherein said solvent is a C₁-C₆ alkanol.

21. The method of claim 18, wherein said solvent comprises at least one organic solvent.

22. The method of claim 1, wherein said colorant is a dye.