OxidantsPor Bento, Luis San Miguel
Inserida em 2006-09-20 Actualizada em 2009-12-11
It was proved that treating liquors with hydrogen peroxide, the performance of decolourization resins use afterwards will improve (Bento, 2004). During oxidation, aldehydes and color compounds with double bonds react forming acids. This fact will decrease colorants molecular weight and will increase colour removal of colour by ion exchange mechanisms. As unsaturated compounds have a high hidrophobicity, they will be preferentially fixed to resins by hydrophobic inter-action. Some of these compounds have an anionic charge and their fixation to the resin is enhanced (Williams, 1992). During resin regeneration these compounds can switch from hydrophobic to ion exchange fixation mechanism (Bento, 1992). This effect will be the cause of resin poisoning and the rapid decrease of decolorization capacity of styrenic divinil-benzenic resins. By oxidation of these compounds, their fixation to resins by ion-exchange mechanism and their removal from resins, during regeneration, will be easier.
Bento L.S.M. (1992) Organic and Inorganic compounds influence on the sugar colourant-ion-exchange resin
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