Warianty tytułu
Magnesium Compounds as the Stabilizers and Alkali Source during Hydrogen Peroxide CTMP Bleaching
Języki publikacji
Abstrakty
Spektrofotometryczne oznaczenia stężenia rodników hydroksylowych za pomocą N,N-dimetylo- 4-nitrozoaniliny (DMNA) umożliwiły ocenę zdolności stabilizującej tlenku i wodorotlenku sodu w stosunku do nadtlenku wodoru. Zbadano wpływ pH, obecności katalizatora (Cu+2) i krzemianu sodu na zużycie DMNA. Zwiększenie dozowania związków magnezu i pH roztworu nadtlenku wodoru do 11,8 ogranicza stężenie rodników hydroksylowych. Potwierdzono synergistyczny efekt stabilizujący związany z obecnością krzemianu sodu i związków magnezu w nadtlenkowej cieczy bielącej masy CTMP. Tlenek i wodorotlenek magnezu jako dodatkowe źródła alkaliów i stabilizatory poprawiły wskaźniki środowiskowe ługów pobielarnianych i ograniczyły zużycie nadtlenku wodoru. Bieląc masy CTMP z dodatkiem Mg(OH)2, w porównaniu do warunków standardowych, uzyskano niewielki wzrost białości (o około 1%) przy zmniejszonej o 2% wydajności.
Spectrophotometric method using N,N-dimethyl-4-nitrosoaniline (DMNA) as a hydroxyl radical trap has been applied to studies of the magnesium oxide and magnesium hydroxide influence on hydrogen peroxide stability. The effects of pH conditions, catalyst (Cu+2) and sodium silicate presence was evaluated. By increasing the charge of magnesium compounds and pH of the hydrogen peroxide solution up to 11.8 the hydroxyl radical concentration can be decreased. Synergistic effect of the hydrogen peroxide stabilization by sodium silicate and magnesium compounds was confirmed for CTMP bleaching. Magnesium oxide and magnesium hydroxide as the additional alkali source and stabilizers improved bleaching effluent characteristics and decreased hydrogen peroxide consumption. The Mg(OH)2-based process resulted in a slight (1%) ISO brightness increase and 2% lower yield as compared to conventional bleaching.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
291-295
Opis fizyczny
Bibliogr. 26 poz.
Twórcy
autor
- Instytut Chemicznej Technologii Drewna, Uniwersytet Przyrodniczy w Poznaniu
Bibliografia
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- 4. He Z., Ni Y.: "Peroxide bleaching of eucalyptus CTMP using magnesium hydroxide as the alkali source", Paptac Annual Meeting Proceedings, Montreal 2005, 1-7.
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Typ dokumentu
Bibliografia
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Identyfikator YADDA
bwmeta1.element.baztech-article-LOD9-0033-0007