Separation, recycling and self-cleaning system of supercritical fluid dyeing machine

A separation, recycling and self-cleaning system of a supercritical fluid dyeing machine, comprising:

• a supercritical fluid medium reservoir, one or more parallel dyeing units, a high-pressure pump, a primary separator, a secondary separator, and a membrane separator, which are sequentially connected by a high-pressure pipe along a medium forward direction, wherein
• when an inlet of the high-pressure pump is in communication with the dyeing unit and the inlet of the high-pressure pump is connected to the membrane separator by a high-pressure loop, the high-pressure pump, the primary separator, the secondary separator, the membrane separator and the high-pressure loop form a first loop for depressurization of the dyeing unit and the membrane separator;
• when the inlet of the high-pressure pump is disconnected from the dyeing unit, the high-pressure pump, the primary separator, the secondary separator, the membrane separator and the high-pressure loop form a second loop for blowback self-cleaning of the high-pressure pump, the primary separator, the secondary separator and the high-pressure loop;
• the high-pressure pump, the primary separator, the secondary separator and the membrane separator forming a third loop for stage-by-stage separation under reduced pressure and recycling of residual dye and a fluid/gas medium in the dyeing unit;
• and
• the supercritical fluid medium reservoir, the membrane separator, the high-pressure loop and the high-pressure pump forming a fourth loop for blowback self-cleaning of the membrane separator.