Variation of Parameters of Organochlorine Compounds, Whiteness, and Absorption Spectra During Multistage Bleaching of Cellulose

Resumo

The results of physicochemical and spectroscopic investigations of deciduous sulfate cellulose at various stages of ECF bleaching are presented. Significant changes in whiteness, the content of organochlorine compounds (OCC), the intensity of absorption bands for the conjugated and unconjugated CP%O groups at the first stages of bleaching, and their stabilization at later stages are demonstrated. The weak effect of multistage bleaching on the structure of the cellulose is demonstrated. Calibration models were constructed for rapid assessment of the parameters of the OCCs and whiteness from the IR spectra.