Waterless Dyeing

Supercritical CO₂ Dyeing Pressure & Solubility Modeler

There is no water and no liquor ratio — but there is still a bath, and its capacity is set by CO₂ density rather than by volume.

Vessel Conditions Supercritical
bar
°C
kg/m³

Read from a CO₂ density chart at the working pressure and temperature.

L
Chrastil Constants Per dye
K
Batch Goods
kg
% owf

Dye Solubility in CO₂

— g/L

Chrastil correlation at the working density and temperature

Vessel Balance

Dye Dissolved per Pass
— g
Dye Required
— g
Passes Required
— no.
CO₂ Charge
— kg
Equivalent Liquor Ratio
— ×
Reduced Pressure
— ×
Reduced Temperature
— ×

Chrastil constants are specific to one dye in one solvent and must come from measured solubility data. Reduced pressure and temperature below 1 mean the fluid is not supercritical and the correlation does not apply. High-pressure vessels are a regulated safety matter — this sizes a process, not a pressure system.

Supercritical CO₂ Dyeing Pressure & Solubility Modeler — free, with the formula and a worked example, at Textile School.