What is Supercritical Dyeing?

SUPERCRITICAL DYEING

Compared with the traditional water bath, the dyes in the supercritical CO2 fluid medium have better level dyeing on polyester fabrics, excellent color fastness to washing and dry and wet rubbing fastness, which can save the post-dyeing treatment process in the traditional water bath method. , shorten the process flow. The CO2 dyeing technology of supercritical fluid equipment is a new type of dyeing technology with good prospects. Using CO2 as the medium, the dyeing process does not produce pollution, which fully reflects the concept of clean production.

SUPERCRITICAL FLUIDS DEGRADE WASTE PLASTICS

Depolymerization in supercritical medium utilizes the excellent solubility and mass transfer properties of supercritical fluids to decompose or degrade polymer wastes in garbage to obtain gas, liquid and solid products. Gases and liquids can be used as fuel or chemical raw materials, viscous paste products can be used as waterproof coatings or adhesives, and the remaining residue can be used as paving or other building materials.

SAFE AND EFFICIENT “SUPER” DISINFECTANT

CO2 supercritical fluid under high pressure can effectively kill all kinds of bacteria, and it is very likely to become a new sterilization technology to replace the controversial radiation sterilization method. Sterilization experiments under working conditions (20MPa, 35℃, 2h, relative humidity of 70% to 90%) showed that the reduction ratio of baker bacteria, Escherichia coli, Staphylococcus, Aspergillus niger and Bacillus subtilis reached 99%. At present, medical textiles are routinely sterilized by high-pressure steam, or treated with epoxy hexane, peracetic acid, etc. These traditional methods are either highly corrosive to equipment, or are cumbersome to operate, and also cause damage to fibers.

The new technology uses a small amount of disinfectant to use liquid CO2 as a carrier or directly uses CO2 in a supercritical state to have a better disinfection effect. Fiber also has a good protective effect.

SUPERCRITICAL CHEMICAL ANALYSIS

Supercritical fluid can be used as mobile phase for chromatographic analysis, and has the advantages of fast analysis speed, good selectivity, high separation efficiency, and mild analysis conditions. Under the same conditions, the analysis speed is about 4 times that of liquid chromatography, and it is widely used in the analysis of samples such as olefin polymers, styrene polymers, glycerides, higher alcohols, amino acids and polycyclic aromatic hydrocarbons.