Documents disponibles écrits par cet auteur

Comments on the origins of N2/CO2 selectivity of gas separation membranes / Parveen Kumar in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - p. 3702 Titre : Comments on the origins of N2/CO2 selectivity of gas separation membranes Type de document : texte imprimé Auteurs : Parveen Kumar, Auteur ; Sangil Kim, Auteur ; Junichi Ida, Auteur Année de publication : 2009 Article en page(s) : p. 3702 Note générale : Chemical engineering Langues : Anglais (eng) Note de contenu : Correspondence En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9001487 [article] Comments on the origins of N2/CO2 selectivity of gas separation membranes [texte imprimé] / Parveen Kumar, Auteur ; Sangil Kim, Auteur ; Junichi Ida, Auteur . - 2009 . - p. 3702. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - p. 3702 Note de contenu : Correspondence En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9001487

Methods for pretreatment of lignocellulosic biomass for efficient hydrolysis and biofuel production / Parveen Kumar in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3713–3729 Titre : Methods for pretreatment of lignocellulosic biomass for efficient hydrolysis and biofuel production Type de document : texte imprimé Auteurs : Parveen Kumar, Auteur ; Diane M. Barrett, Auteur ; Michael J. Delwiche, Auteur Année de publication : 2009 Article en page(s) : pp. 3713–3729 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Biofuels  Lignocellulosic  materials  Pretreatment  techniques Résumé : Biofuels produced from various lignocellulosic materials, such as wood, agricultural, or forest residues, have the potential to be a valuable substitute for, or complement to, gasoline. Many physicochemical structural and compositional factors hinder the hydrolysis of cellulose present in biomass to sugars and other organic compounds that can later be converted to fuels. The goal of pretreatment is to make the cellulose accessible to hydrolysis for conversion to fuels. Various pretreatment techniques change the physical and chemical structure of the lignocellulosic biomass and improve hydrolysis rates. During the past few years a large number of pretreatment methods have been developed, including alkali treatment, ammonia explosion, and others. Many methods have been shown to result in high sugar yields, above 90% of the theoretical yield for lignocellulosic biomasses such as woods, grasses, corn, and so on. In this review, we discuss the various pretreatment process methods and the recent literature that has reported on the use of these technologies for pretreatment of various lignocellulosic biomasses. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801542g#afn2 [article] Methods for pretreatment of lignocellulosic biomass for efficient hydrolysis and biofuel production [texte imprimé] / Parveen Kumar, Auteur ; Diane M. Barrett, Auteur ; Michael J. Delwiche, Auteur . - 2009 . - pp. 3713–3729. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3713–3729 Mots-clés : Biofuels  Lignocellulosic  materials  Pretreatment  techniques Résumé : Biofuels produced from various lignocellulosic materials, such as wood, agricultural, or forest residues, have the potential to be a valuable substitute for, or complement to, gasoline. Many physicochemical structural and compositional factors hinder the hydrolysis of cellulose present in biomass to sugars and other organic compounds that can later be converted to fuels. The goal of pretreatment is to make the cellulose accessible to hydrolysis for conversion to fuels. Various pretreatment techniques change the physical and chemical structure of the lignocellulosic biomass and improve hydrolysis rates. During the past few years a large number of pretreatment methods have been developed, including alkali treatment, ammonia explosion, and others. Many methods have been shown to result in high sugar yields, above 90% of the theoretical yield for lignocellulosic biomasses such as woods, grasses, corn, and so on. In this review, we discuss the various pretreatment process methods and the recent literature that has reported on the use of these technologies for pretreatment of various lignocellulosic biomasses. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801542g#afn2

Pulsed electric field pretreatment of switchgrass and wood chip species for biofuel production / Parveen Kumar in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10996-11001 Titre : Pulsed electric field pretreatment of switchgrass and wood chip species for biofuel production Type de document : texte imprimé Auteurs : Parveen Kumar, Auteur ; Diane M. Barrett, Auteur ; Michael J. Delwiche, Auteur Année de publication : 2011 Article en page(s) : pp. 10996-11001 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production  Wood  chip  Pretreatment  Electric  field Résumé : In biomass-to-fuel conversion, the biomass needs to be pretreated so that the cellulose in the plant fibers is exposed for conversion of the lignocellulosic biomass to fuels and chemicals. In this study, we report on the design and fabrication of a pulsed electric field (PEF) system for pretreatment of wood chip and switchgrass samples. Wood chip samples were given 1000 and 2000 pulses of 1 kV/cm, and 1000, 2000, and 5000 pulses of 10 kV/cm with a pulse width of 100 μs and frequency of 3 Hz. Switchgrass samples were given 1000, 2000, and 5000 pulses of 2.5, 5, 8, and 10 kV/cm with a pulse width of 100 μs and frequency of 3 Hz. The uptake of a colored dye neutral red C15H17ClN4 (MW ~ 289) in untreated and PEF treated samples was studied to quantify the effect ofPEF treatment on diffusion in plant tissues. Wood chip samples treated at 1 kV/cm showed a dye uptake similar to that of untreated wood chip samples. The switchgrass samples were resistant to change in the structure at low field strengths up to 5 kV/cm. The samples treated at field strengths of ≥8 kV/cm showed faster and larger neutral red uptake, suggesting an increase in the porosity of switchgrass samples. Similar phenomena were observed for wood chip samples treated at 10 kV/cm. Permeabilization of switchgrass and wood chip species using PEF can be utilized to improve cellulose hydrolysis to sugar and hence efficient fuel conversion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573295 [article] Pulsed electric field pretreatment of switchgrass and wood chip species for biofuel production [texte imprimé] / Parveen Kumar, Auteur ; Diane M. Barrett, Auteur ; Michael J. Delwiche, Auteur . - 2011 . - pp. 10996-11001. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10996-11001 Mots-clés : Production  Wood  chip  Pretreatment  Electric  field Résumé : In biomass-to-fuel conversion, the biomass needs to be pretreated so that the cellulose in the plant fibers is exposed for conversion of the lignocellulosic biomass to fuels and chemicals. In this study, we report on the design and fabrication of a pulsed electric field (PEF) system for pretreatment of wood chip and switchgrass samples. Wood chip samples were given 1000 and 2000 pulses of 1 kV/cm, and 1000, 2000, and 5000 pulses of 10 kV/cm with a pulse width of 100 μs and frequency of 3 Hz. Switchgrass samples were given 1000, 2000, and 5000 pulses of 2.5, 5, 8, and 10 kV/cm with a pulse width of 100 μs and frequency of 3 Hz. The uptake of a colored dye neutral red C15H17ClN4 (MW ~ 289) in untreated and PEF treated samples was studied to quantify the effect ofPEF treatment on diffusion in plant tissues. Wood chip samples treated at 1 kV/cm showed a dye uptake similar to that of untreated wood chip samples. The switchgrass samples were resistant to change in the structure at low field strengths up to 5 kV/cm. The samples treated at field strengths of ≥8 kV/cm showed faster and larger neutral red uptake, suggesting an increase in the porosity of switchgrass samples. Similar phenomena were observed for wood chip samples treated at 10 kV/cm. Permeabilization of switchgrass and wood chip species using PEF can be utilized to improve cellulose hydrolysis to sugar and hence efficient fuel conversion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573295