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The solubility of 1‐amino‐2‐hydroxy‐4‐methoxy‐anthraquinone (CI Disperse Red 4) and 1‐amino‐2‐hydroxy‐anthraquinone (CI Disperse Red 15) in supercritical carbon dioxide was measured using a dynamic method over a temperature range from 343.15 to 373.15 K and a pressure range from 14 to 22 MPa. The experimental data are analysed by using the back propagation neural network constructed by MATLAB. In...