Patent ID: 8613779

Claim:
A process for dyeing textiles using a recycled dye bath without carrying out any later depuration treatment, the dyeing process comprising: filtering a used dye bath to mechanically withhold fibers and particles; extracting a sample from the filtered dye bath; analyzing the sample using UV-vis spectroscopy by comparing corresponding calibration curves for each dye in the sample; pumping a measured volume of the residual dye bath into a dyeing machine; diluting the measured volume of the filtered dye bath in the dyeing machine with an added volume of clean water to about an individual volume of the dyeing machine; reconstituting the diluted dye bath in the dyeing machine with auxiliary and dye products in accordance to an analyzed result of the extracted sample; measuring and adjusting a pH of the reconstituted dye bath; using the reconstituted dye bath to dye textiles in the dyeing machine starting at an initial temperature which is ramped along a heating gradient up to a boiling point at a threshold time and then cooled down; and emptying out the used dye bath from the dyeing machine into an auxiliary tank.