Cysteine-Fe(III) Catalyzed Oxidation of Common Polymer Used in Oilfield by H2O2 in a Wide pH Range

Resumo

In order to explore more efficient catalytic oxidation of commonly used polymer catalysts, cysteine as ligand and transition metal ions were used to prepare series complexes for hydrogen peroxide oxidation. Cysteine-Fe(III) was selected to serve as a catalyst for the oxidation degradation of common polymer hydroxypropyl guar gum under different pH, temperature, dosage of catalyst, hydrogen peroxide, ratio of cysteine and Fe(III), amount of H₂O₂. The final results showed that the temperature was 45°C, pH of 7, H₂O₂ added amount of hydroxypropyl guar gum was 10.0%, catalyst cysteine-Fe(III) dosage was 10% of the amount of H₂O₂ material, cysteine-Fe(III) the ratio was 1: 2, cysteine-Fe(III) H₂O₂ oxidation degradation of hydroxypropyl guar gum have good catalytic effect. After continuous degradation of 40 min, the relative viscosity of hydroxypropyl guar gum can be reduced to 81.6%, and the elimination rate of COD can reach to 97% after increasing the amount of hydrogen peroxide for 4 h.