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New insights into the gelation behavior of polyethyleneimine cross - linking partially hydrolyzed polyacrylamide gels / Jia Hu in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12155–12166 Titre : New insights into the gelation behavior of polyethyleneimine cross - linking partially hydrolyzed polyacrylamide gels Type de document : texte imprimé Auteurs : Jia Hu, Auteur ; Jin-Zhou Zhao, Auteur ; Fa-Yang Jin, Auteur Année de publication : 2012 Article en page(s) : pp. 12155–12166 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gelation Résumé : Using polymer gel is still the mainstream technique of the chemical method for water shut-off in mature oilfield development. The gelation performance of polyethyleneimine (PEI) cross-linking partially hydrolyzed polyacrylamide (HPAM) gel was systematically investigated in this paper by using three types of molecular weight (Mw) HPAM. Results show that the gelant solution (the fluid solution of cross-linker and polymer that exists before gelation) can slightly gel even at room temperature and form a rudimentary 3D network structure for protecting the subsequent gelling. The main factors, including HPAM, PEI concentrations, HPAM Mw, and total dissolved solids (TDS) to affect the gelation performance are also discussed. The gelation time is around 18–72 h at 65 °C, which is much longer than the commonly used chromium(III)-acetate cross-linking HPAM gel system. The gelation performance of the PEI/HPAM gel system is improved after flowing through porous media and shows the adverse law for a porous media sheared chromium(III)-acetate or phenol-formaldehyde cross-linking HPAM gel system. Atomic force microscopy (AFM) scanning results show that the microstructure of PEI/HPAM gel distributes a lot of cavities. Compared to the original premature gel (code B), the cavities are more uniform and regular after flowing through porous media. In addition, this study revealed that the presence of free oxygen in the uniform cavities of the weak cross-linked gel after flowing through porous media can accelerate the oxidation reaction to produce a darker brown gel. It also discusses how these new findings will affect the application of the gel system in the oil field. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399664 [article] New insights into the gelation behavior of polyethyleneimine cross - linking partially hydrolyzed polyacrylamide gels [texte imprimé] / Jia Hu, Auteur ; Jin-Zhou Zhao, Auteur ; Fa-Yang Jin, Auteur . - 2012 . - pp. 12155–12166. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12155–12166 Mots-clés : Gelation Résumé : Using polymer gel is still the mainstream technique of the chemical method for water shut-off in mature oilfield development. The gelation performance of polyethyleneimine (PEI) cross-linking partially hydrolyzed polyacrylamide (HPAM) gel was systematically investigated in this paper by using three types of molecular weight (Mw) HPAM. Results show that the gelant solution (the fluid solution of cross-linker and polymer that exists before gelation) can slightly gel even at room temperature and form a rudimentary 3D network structure for protecting the subsequent gelling. The main factors, including HPAM, PEI concentrations, HPAM Mw, and total dissolved solids (TDS) to affect the gelation performance are also discussed. The gelation time is around 18–72 h at 65 °C, which is much longer than the commonly used chromium(III)-acetate cross-linking HPAM gel system. The gelation performance of the PEI/HPAM gel system is improved after flowing through porous media and shows the adverse law for a porous media sheared chromium(III)-acetate or phenol-formaldehyde cross-linking HPAM gel system. Atomic force microscopy (AFM) scanning results show that the microstructure of PEI/HPAM gel distributes a lot of cavities. Compared to the original premature gel (code B), the cavities are more uniform and regular after flowing through porous media. In addition, this study revealed that the presence of free oxygen in the uniform cavities of the weak cross-linked gel after flowing through porous media can accelerate the oxidation reaction to produce a darker brown gel. It also discusses how these new findings will affect the application of the gel system in the oil field. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399664

Selective separation of wood components based on hansen’s theory of solubility / Huaming Yu in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7513-7519 Titre : Selective separation of wood components based on hansen’s theory of solubility Type de document : texte imprimé Auteurs : Huaming Yu, Auteur ; Jia Hu, Auteur ; Jie Chang, Auteur Année de publication : 2011 Article en page(s) : pp. 7513-7519 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubility  Wood Résumé : A new method for selective separation of wood components is presented. Based on Hansen's theory of solubility, ionic liquid (IL) 1-butyl-3-methylimidazolium bromine ([Bmin]Br) was mixed with aqueous ethanol HBr the acid catalyst in the degradation of wood components, was found to form in situ by ion exchange between IL and organic acid. The hydrogen bonding capacity of the mixture was enhanced as the presence of IL, which led to the promotion of the solubilization of lignin and other products from carbohydrates hydrolysis. The data showed that, variations of the IL concentration caused cellulose to be separated from pine wood with a purity of more than 94%, or to be hydrolyzed and converted into saccharides together with hemicellulose. Because of the complete hydrolysis of hemicellulose, the cross-linked matrix oflignin and hemicellulose was destroyed, which led to the isolation of lignin with a high purity of about 93%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239067 [article] Selective separation of wood components based on hansen’s theory of solubility [texte imprimé] / Huaming Yu, Auteur ; Jia Hu, Auteur ; Jie Chang, Auteur . - 2011 . - pp. 7513-7519. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7513-7519 Mots-clés : Solubility  Wood Résumé : A new method for selective separation of wood components is presented. Based on Hansen's theory of solubility, ionic liquid (IL) 1-butyl-3-methylimidazolium bromine ([Bmin]Br) was mixed with aqueous ethanol HBr the acid catalyst in the degradation of wood components, was found to form in situ by ion exchange between IL and organic acid. The hydrogen bonding capacity of the mixture was enhanced as the presence of IL, which led to the promotion of the solubilization of lignin and other products from carbohydrates hydrolysis. The data showed that, variations of the IL concentration caused cellulose to be separated from pine wood with a purity of more than 94%, or to be hydrolyzed and converted into saccharides together with hemicellulose. Because of the complete hydrolysis of hemicellulose, the cross-linked matrix oflignin and hemicellulose was destroyed, which led to the isolation of lignin with a high purity of about 93%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239067