Abstract
The functional properties of the polymeric hydrogen peroxide stabilising agent, poly(alpha-hydroxyacrylic acid) (PHA) were defined by analysing the escaping oxygen content on-line by gas-phase mass spectrometry. A statistically significant regression model with good fit describing the system was developed and its response surfaces were generated. Furthermore, a pseudo-second order kinetic expression was established for a system including the effect of PHA. PHA was found to generate a stabilising effect over hydrogen peroxide in the presence of 2 mg/kg metals Fe and Mn at pH 10, but the stabilisation ability is limited to temperatures below ca. 60 degrees C. Under typical bleaching conditions for mechanical pulp, i.e. pH 9 and T=70 degrees C, a slight optimum of approximately 150 mg/kg in terms of PHA content can be seen. Introduction of PHA generally exposes the system more to the effects of pH and temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 258-273 |
| Number of pages | 16 |
| Journal | OXIDATION COMMUNICATIONS |
| Volume | 33 |
| Issue number | 2 |
| Publication status | Published - 2010 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- hydrogen peroxide
- decomposition
- poly(alpha-hydroxyacrylic acid)
- stabiliser
- kinetic model