Method and integrated system for non-aqueous solvent medium (NASM) dyeing of multiple forms of synthetic, natural and blended textiles

A system for dyeing multiple forms of textile using liquefied CO2, the system comprising:

• a first pressurizing pump for pressurizing the liquefied CO2 to obtain pressurized liquefied CO2;
• a heater for heating the pressurized liquefied CO2 to obtain supercritical CO2 (Sc—CO2);
• a dyestuff vessel for mixing a dyestuff and the Sc—CO2 by an internal circulation inside the dyestuff vessel to obtain Sc—CO2-mixed dyestuff;
• a dyeing vessel for receiving the Sc—CO2-mixed dyestuff from the dyestuff vessel and receiving the Sc—CO2 through a bypass channel independent of the dyestuff vessel;
• a circulation pump for continuously circulating the Sc—CO2 and the Sc—CO2-mixed dyestuff between the dyeing vessel and the dyestuff vessel for dyeing the textile;
• one or more cyclone separators for removing the dyestuff from the Sc—CO2-mixed dyestuff to obtain separated liquefied CO2,
• a second pressurizing pump for pressurizing CO2 to the liquefied CO2;
• and
• a liquefied CO2 storage vessel for storing the liquefied CO2 and the separated liquefied CO2 from the one or more cyclone separators,
• wherein the system further comprises a back pressure regulator for allowing a flow of the Sc—CO2 and the Sc—CO2-mixed dyestuff to the one or more cyclone separators when a pressure of the system is higher than an expected range,
• wherein the back pressure regulator is disposed between the circulation pump and the one or more cyclone separators and directly connects to both the circulation pump and the one or more cyclone separators.