| Titre : | Bleaching miscanthus x giganteus acetosolv pulps with a new totally chlorine-free sequence and the effect of carbohydrate protectors (2010) |
| Auteurs : | Juan Jose Villaverde, Auteur ; Pablo Ligero, Auteur ; Alberto De Vega, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 48 N° 22, Novembre 2009) |
| Article en page(s) : | pp. 9830–9836 |
| Note générale : | Chemical engineering |
| Langues : | Anglais |
| Tags : | Semibleached Miscanthus x giganteus Acetosolv pulp Alkaline treatmentPeroxyacetate treatment |
| Résumé : | The bleaching of semibleached Miscanthus x giganteus Acetosolv pulp, after alkaline and peroxyacetate treatments, was investigated by a novel totally chlorine-free (TCF) sequence. Oxygen delignification (O-stage), peroxide (P-stage), and oxygen-pressurized hydrogen peroxide stage (PO-stage) were assayed in order to reach the target values for dissolving pulps. Using factorial experimental designs, we investigated the effects of the bleaching variables on the parameters defining the process and checked the effects after adding chelating agents. Regression equations satisfactorily fitted the experimental results, and under the optimum conditions, a fully bleached pulp (86.9% ISO brightness) with a viscosity of 786 cm3/g and a very favorable kappa number (1.3) was obtained. Carbohydrate protectors substantially improved the characteristics of dissolving pulps, but pulps with kappa values above 6 did not improve with carbohydrate protectors as expected. |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie9008277 |
