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Effects of carboxyl content on the characteristics of TMP long fibers / Lianshan Mao in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3809–3812 Titre : Effects of carboxyl content on the characteristics of TMP long fibers Type de document : texte imprimé Auteurs : Lianshan Mao, Auteur ; Kweinam Law, Auteur ; Daneault Claude, Auteur ; Brouillette Francois, Auteur Année de publication : 2008 Article en page(s) : p. 3809–3812 Note générale : Bibliogr. p. 3812 Langues : Anglais (eng) Mots-clés : TMP  long  fibers;  Carboxyl  groups;  Oxidation Résumé : This work examined the effects of carboxyl content on the characteristics of TMP long fibers. The carboxyl groups on TMP long fibers were generated by a TEMPO-mediated oxidation using different amounts of sodium hypochlorite. In general, the increases in carboxyl content improved the tensile and burst indices but reduced the tear index and fines retention. It was also found that low carboxyl content on oxidized long fibers could adsorb part of the dissoluble substance (DS) and other substances, reducing the DS and total organic carbon (TOC) in whitewater; the adsorption capacity decreased with increasing carboxyl content. Addition of cationic polymer increased the retention of fines and decreased the DS and other substances in whitewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071274z [article] Effects of carboxyl content on the characteristics of TMP long fibers [texte imprimé] / Lianshan Mao, Auteur ; Kweinam Law, Auteur ; Daneault Claude, Auteur ; Brouillette Francois, Auteur . - 2008 . - p. 3809–3812. Bibliogr. p. 3812 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3809–3812 Mots-clés : TMP  long  fibers;  Carboxyl  groups;  Oxidation Résumé : This work examined the effects of carboxyl content on the characteristics of TMP long fibers. The carboxyl groups on TMP long fibers were generated by a TEMPO-mediated oxidation using different amounts of sodium hypochlorite. In general, the increases in carboxyl content improved the tensile and burst indices but reduced the tear index and fines retention. It was also found that low carboxyl content on oxidized long fibers could adsorb part of the dissoluble substance (DS) and other substances, reducing the DS and total organic carbon (TOC) in whitewater; the adsorption capacity decreased with increasing carboxyl content. Addition of cationic polymer increased the retention of fines and decreased the DS and other substances in whitewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071274z

Studies on kinetics and reuse of spent liquor in the TEMPO-mediated selective oxidation of mechanical pulp / Lianshan Mao in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 113–116 Titre : Studies on kinetics and reuse of spent liquor in the TEMPO-mediated selective oxidation of mechanical pulp Type de document : texte imprimé Auteurs : Lianshan Mao, Auteur ; Pu Ma, Auteur ; Kweinam Law, Auteur Année de publication : 2010 Article en page(s) : pp. 113–116 Note générale : Industrail chemistry Langues : Anglais (eng) Mots-clés : Studies--kinetics--reuse--spent--liquor--TEMPO-mediated  selective--oxidation--mechanical  pulp Résumé : The kinetics and reuse of spent liquor in the TEMPO-mediated oxidation of mechanical pulp have been studied. It was found that the oxidation reaction of the mechanical pulp by the 2,2,6,6-tetramethyl piperidine-1-oxyl radical (TEMPO)−NaBr−NaOCl system can be approximately described by first-order kinetics with respect to TEMPO and NaBr. In the concentration range used, the rate constant k is directly proportional to the concentration of TEMPO and NaBr, whereas the concentration of NaOCl determines the end of conversion of the primary alcohol groups on the mechanical pulp into carboxylic acid groups. It was also found that the spent reaction liquor can be recycled and reused with reinforced addition of NaOCl without additional TEMPO and NaBr and remains effective in generating carboxylic acid groups on mechanical pulp. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901039r [article] Studies on kinetics and reuse of spent liquor in the TEMPO-mediated selective oxidation of mechanical pulp [texte imprimé] / Lianshan Mao, Auteur ; Pu Ma, Auteur ; Kweinam Law, Auteur . - 2010 . - pp. 113–116. Industrail chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 113–116 Mots-clés : Studies--kinetics--reuse--spent--liquor--TEMPO-mediated  selective--oxidation--mechanical  pulp Résumé : The kinetics and reuse of spent liquor in the TEMPO-mediated oxidation of mechanical pulp have been studied. It was found that the oxidation reaction of the mechanical pulp by the 2,2,6,6-tetramethyl piperidine-1-oxyl radical (TEMPO)−NaBr−NaOCl system can be approximately described by first-order kinetics with respect to TEMPO and NaBr. In the concentration range used, the rate constant k is directly proportional to the concentration of TEMPO and NaBr, whereas the concentration of NaOCl determines the end of conversion of the primary alcohol groups on the mechanical pulp into carboxylic acid groups. It was also found that the spent reaction liquor can be recycled and reused with reinforced addition of NaOCl without additional TEMPO and NaBr and remains effective in generating carboxylic acid groups on mechanical pulp. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901039r