Documents disponibles écrits par cet auteur

Measuring and controlling model of pulp kappa number with spectroscopy during batch sulfite pulping process / Wenhao Shen in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8980–8984 Titre : Measuring and controlling model of pulp kappa number with spectroscopy during batch sulfite pulping process Type de document : texte imprimé Auteurs : Wenhao Shen, Auteur ; Xiaoquan Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 8980–8984 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pulp  kappa  number  Spectroscopy Résumé : Aiming at the difficulties and problems of online measurement of pulp kappa number during batch pulping, this paper proposes a new measuring idea, which is to predict the lignin content in pulp through the measurement of dissolved lignin in cooking liquor with spectral technology. The basic and modified mathematical model of kappa number during sulfite pulping as well as the end point controlling model are put forward in detail. The site running result shows that the introduction of modified factor ε, which represents the change of the total lignin amount added into the digester, is effective. Therefore, the online measurement of kappa number and the determination of the end point of pulping can be achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900327a [article] Measuring and controlling model of pulp kappa number with spectroscopy during batch sulfite pulping process [texte imprimé] / Wenhao Shen, Auteur ; Xiaoquan Chen, Auteur . - 2009 . - pp. 8980–8984. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8980–8984 Mots-clés : Pulp  kappa  number  Spectroscopy Résumé : Aiming at the difficulties and problems of online measurement of pulp kappa number during batch pulping, this paper proposes a new measuring idea, which is to predict the lignin content in pulp through the measurement of dissolved lignin in cooking liquor with spectral technology. The basic and modified mathematical model of kappa number during sulfite pulping as well as the end point controlling model are put forward in detail. The site running result shows that the introduction of modified factor ε, which represents the change of the total lignin amount added into the digester, is effective. Therefore, the online measurement of kappa number and the determination of the end point of pulping can be achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900327a

Online monitoring of kappa number during batch pulping by visible spectroscopy / Wenhao Shen in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4872–4876 Titre : Online monitoring of kappa number during batch pulping by visible spectroscopy Type de document : texte imprimé Auteurs : Wenhao Shen, Auteur ; Xiaoquan Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 4872–4876 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Kappa  number  Batch  pulping  Online  measurement  Spectroscopy Résumé : Aiming at the difficulties and problems of online measurement of pulp Kappa number during batch pulping, a novel measuring idea was proposed to predict the lignin content in pulp through the measurement of dissolved lignin in cooking liquor with spectroscopic technology. It was discovered that the spectral absorption of sulfite cooking liquor from Masson’s pine in 460−580 nm wave range resulted mainly from lignin sulfonate with high molecular weight, while saccharide and water in sulfite cooking liquor have no obvious absorption. The delignification study shows that the sulfite cooking delignification process can be observed with selected visible wavelength. Mathematical models of online Kappa number determination with visible spectroscopy were developed by chemometrics for batch sulfite pulping. After applying to sulfite pulp mill, the results showed that the new measuring method was much better than the manual method: The first-class proportion of pulp has been improved from 55% to 70%, the pulp Kappa number could be controlled within ±2 units. With this new method, it is possible not only to measure sulfite pulp Kappa number but also to perform the end point controlling of the sulfite pulping process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie802008r [article] Online monitoring of kappa number during batch pulping by visible spectroscopy [texte imprimé] / Wenhao Shen, Auteur ; Xiaoquan Chen, Auteur . - 2009 . - pp. 4872–4876. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4872–4876 Mots-clés : Kappa  number  Batch  pulping  Online  measurement  Spectroscopy Résumé : Aiming at the difficulties and problems of online measurement of pulp Kappa number during batch pulping, a novel measuring idea was proposed to predict the lignin content in pulp through the measurement of dissolved lignin in cooking liquor with spectroscopic technology. It was discovered that the spectral absorption of sulfite cooking liquor from Masson’s pine in 460−580 nm wave range resulted mainly from lignin sulfonate with high molecular weight, while saccharide and water in sulfite cooking liquor have no obvious absorption. The delignification study shows that the sulfite cooking delignification process can be observed with selected visible wavelength. Mathematical models of online Kappa number determination with visible spectroscopy were developed by chemometrics for batch sulfite pulping. After applying to sulfite pulp mill, the results showed that the new measuring method was much better than the manual method: The first-class proportion of pulp has been improved from 55% to 70%, the pulp Kappa number could be controlled within ±2 units. With this new method, it is possible not only to measure sulfite pulp Kappa number but also to perform the end point controlling of the sulfite pulping process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie802008r