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Scale inhibition and removal in continuous pulp digesters / Sujit Banerjee in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10283-10286 Titre : Scale inhibition and removal in continuous pulp digesters Type de document : texte imprimé Auteurs : Sujit Banerjee, Auteur ; Tuan Le, Auteur Année de publication : 2012 Article en page(s) : pp. 10283-10286 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Calcium  carbonate  Pulp  digesters Résumé : Calcium carbonate scaling occurs in the chip feed system and the cooking vessel of continuous digesters in pulp mills, and it arises from the reaction of calcium from wood chips with carbonate in the cooking liquor. Commercial antiscalants are typically expensive and rarely keep the system scale-free. Lignin derivatives have been proposed as antiscalants, because of their ability to chelate calcium, but they have not been adopted commercially. We demonstrate that addition of 1% black liquor to white liquor reduces or prevents calcium scaling, as shown by a simple new test that measures the degree to which scale resists abrasive removal from a metal surface. These findings were validated in a full-scale mill trial, where the black liquor not only inhibited calcium scale formation, but also removed existing scale. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301352j [article] Scale inhibition and removal in continuous pulp digesters [texte imprimé] / Sujit Banerjee, Auteur ; Tuan Le, Auteur . - 2012 . - pp. 10283-10286. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10283-10286 Mots-clés : Calcium  carbonate  Pulp  digesters Résumé : Calcium carbonate scaling occurs in the chip feed system and the cooking vessel of continuous digesters in pulp mills, and it arises from the reaction of calcium from wood chips with carbonate in the cooking liquor. Commercial antiscalants are typically expensive and rarely keep the system scale-free. Lignin derivatives have been proposed as antiscalants, because of their ability to chelate calcium, but they have not been adopted commercially. We demonstrate that addition of 1% black liquor to white liquor reduces or prevents calcium scaling, as shown by a simple new test that measures the degree to which scale resists abrasive removal from a metal surface. These findings were validated in a full-scale mill trial, where the black liquor not only inhibited calcium scale formation, but also removed existing scale. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301352j